JP5938207B2 - Power management system and power management method - Google Patents

Description

  The present invention relates to a power management system and a power management method for managing power supply and demand in a building, and in particular, a power storage device, a control device that controls an operation state of the power storage device, and information indicated by data transmitted from the control device. The present invention relates to a power management system and a power management method using a notification device that notifies a user of the above.

  As a power management system that manages power supply and demand in buildings, it uses communication technology to monitor the balance of power supply and demand in homes, and automatically controls the operation of electrical equipment such as home appliances and the switching of power supply sources. A system (home energy management system, hereinafter referred to as HEMS) is known. Some HEMSs have a power storage device as a power supply facility and a control device that remotely controls the operation state of the power storage device. In such a system, for the purpose of rationally supplying power to a load (electric power load) in a house, the above-described control device switches the operation state of the power storage device according to the load fluctuation, for example, the power storage device stores power. The generated power is discharged.

  On the other hand, in a power supply system provided with a power storage device, an abnormality or deterioration of the power storage device is detected, or the remaining amount of power stored in the power storage device is calculated, and the result is calculated by the user (system). (For example, refer to Patent Documents 1 to 3). According to the system described in Patent Literature 1, it is possible to determine whether or not the operating state of the storage battery is normal based on information on the electrical characteristics of the storage battery, weather information, and the like. According to the system described in Patent Document 2, after obtaining the theoretical remaining capacity based on the initial capacity of the storage battery and the charge / discharge integration result, the theoretical voltage value corresponding to the theoretical remaining capacity and the actual voltage value actually measured. It is possible to determine the degree of deterioration of the storage battery. According to the system described in Patent Document 3, it is possible to monitor the remaining rate of the storage battery by monitoring the discharge rate from the storage battery and comparing the discharge rate with the threshold value.

JP 2006-136085 A JP 2011-80811 A JP 2011-83057 A

  By the way, in a power supply system equipped with a power storage device, if the load in the building is overloaded while the power storage device is in a discharge state, the power storage device is in a stopped state (both power storage and discharge are performed). May be switched to a state of If such a situation is left unattended, the power stored in the power storage device cannot be used effectively, so it is necessary to notify the user of a change in the operating state of the power storage device. However, even if the change in the operating state of the power storage device is notified to the user, if the load in the building remains overloaded, even if the operating state of the power storage device is returned to the discharged state, the state is again stopped. The situation where the electric power stored in the power storage device cannot be effectively used will not be improved.

  The above problems cannot be sufficiently dealt with by the systems described in Patent Documents 1 to 3 described above, but should be solved as soon as possible in today's environment where reduction of the environmental load is required.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is that the load in the building is overloaded and the operation state of the power storage device is changed from the discharge state to the stop state. In this case, the power management system and the power management method can be realized that can notify the user of the situation and suppress the return to the stop state again when the operation state of the power storage device is returned to the discharge state. That is.

According to the power management system of the present invention, the problem is that a power storage device that stores power and discharges the stored power when supplying power to a load in a building, and an operating state of the power storage device A power management system comprising: a control device that controls power and a notification device that informs a user of information indicated by data transmitted from the control device, wherein the operating state of the power storage device stores power Switchable to any one of a storage state, a discharge state in which stored power is discharged, and a stop state in which neither storage or discharge of power is performed, and is in the discharge state the size of the load is switched from the discharge state exceeds a predetermined value to the stop state while the energy storage as a mode for switching the operating state of the electric storage device, in a preset discharging period Scheduled operation mode for discharging electric power stored in location are provided, the control device, the stop state operating condition of the electric storage device from the discharge state by the magnitude of the load exceeds a specified value An overload detection unit that detects that the load has been switched to, and a notification for informing the user that the magnitude of the load has exceeded a specified value according to a detection result of the overload detection unit. A data generation unit that generates overload notification data, and a response operation that detects a user load reduction operation as a user response operation to information notified by the notification device based on the overload notification data generated by the data generation unit comprising: a detection unit, and a toggle portion you switch the operating state of the electric storage device, the switching unit, switching the operating state of the power storage device at the scheduled operation mode In the case of switching, when the time set as the discharge start time is reached, the operation state of the power storage device is switched to the discharge state, and the operation state of the power storage device is changed from the discharge state due to the magnitude of the load exceeding a specified value. In the case of switching to the stop state, this is solved by limiting the return to the discharge state until the response operation detection unit detects the load reduction operation .

In addition, according to the power management method of the present invention, the problem is that a power storage device that stores power and discharges the power stored when power is supplied to a load in a building, and the power storage device A power management method using a power management system comprising: a control device that controls an operation state; and a notification device that informs a user of information indicated by data transmitted from the control device, wherein the operation state of the power storage device As a mode for switching between, a schedule operation mode for discharging power stored in the power storage device during a preset discharge period is prepared, and a discharge state in which the operation state of the power storage device is discharging the stored power When the load size exceeds a specified value, the operation state of the power storage device is in a stopped state in which neither power storage nor discharge is performed from the discharge state. An overload detection step for detecting the switching to the control device, and an overload for notifying the user that the magnitude of the load exceeds a specified value according to a detection result in the overload detection step. Based on the data generation step of generating the notification data by the control device and the overload notification data generated in the data generation step, the notification device informs the user that the magnitude of the load exceeds a specified value. A notification step of notifying, a response operation detecting step of detecting a load reduction operation of the user by the control device, and a driving state of the power storage device by the control device as a response operation of the user to the information notified in the notification step. includes a switching step of switching, and in the switching step, off operating state of the power storage device at the scheduled operation mode Obtaining case, switch to become the set time as the discharge start time operating state of the electrical storage device to the discharge state, the operation state wherein the discharge state of the electric storage device by the magnitude of the load exceeds a specified value In the case of switching to the stop state, the problem is solved by limiting the return to the discharge state until the load reduction operation is detected in the response operation detection step.

With the above configuration, in the present invention, when the operation state of the power storage device is changed from the discharge state to the stop state due to the load in the building exceeding the specified value, the user can be notified of the situation through the notification device. Is possible. Further, according to the present invention, when the operation state of the power storage device is changed from the discharge state to the stop state due to the load in the building exceeding the specified value, the user can respond to the information notified by the notification device. As long as there is no response, the operation state of the power storage device is restricted from being returned to the discharge state. As a result, it is possible to suppress a situation in which the load in the building remains above the specified value, so that even if the state of the power storage device is returned to the discharge state, the state is again switched to the stop state. More specifically, as long as the user does not perform the operation of reducing the load in the building (that is, the load is not reduced), the operation state of the power storage device is restricted from being returned to the discharge state. As a result, it is possible to more effectively suppress a situation in which even if the state of the power storage device is returned to the discharged state because the load in the building still exceeds the specified value, the state is switched to the stopped state again. Become.

Further, in the power management system, the power storage device includes a storage unit that stores an overload flag that changes when the magnitude of the load exceeds a prescribed value, and the magnitude of the load has a prescribed value. When the value exceeds the value, the overload flag value is generated to indicate that the value of the overload flag has reached an overload value that is a value when the magnitude of the load exceeds a specified value. A flag data transmission unit that transmits the load, and the overload detection unit receives the overload flag data transmitted from the flag data transmission unit, whereby the magnitude of the load exceeds a specified value. When the operation state of the power storage device is switched from the discharge state to the stop state, the response operation detection unit detects the load reduction operation and sets the value of the overload flag to the overload. Hour value A flag value switching signal for returning to a non-overload value, which is a value when the magnitude of the load does not exceed a specified value, is transmitted to the power storage device, and the switching unit is a value of the overload flag. It is good also as restrict | limiting the return to the said discharge state until it returns to the said non-overload value after becoming the said overload value.
In such a configuration, an overload flag, which is information indicating that the load in the building has exceeded the specified value, is stored on the power storage device side, and when the response operation detection unit detects the user's load reduction operation, Processing for returning the value of the overload flag from the overload value to the non-overload value is executed on the device side. As described above, in the above configuration, the overload flag is stored and updated on the power storage device side, and therefore, for example, the specified value of the power load that becomes the determination criterion of the overload accompanying a change in the capacity of the power storage device, etc. Even if it changes, it becomes possible to accurately control the operation state of the power storage device during an overload (specifically, restriction on return to the discharge state).

In the above power management system, the power storage device includes an inverter that converts the power stored in the power storage device from DC power to AC power and outputs the inverter, and the magnitude of the output power of the inverter is the load The overload flag may be an inverter overload flag whose value changes when the magnitude of the output power of the inverter exceeds a set value.
Alternatively, in the above-described power management system, the power storage device includes a circuit breaker for interrupting power transmission from the power storage device to the load, and the circuit breaker is configured such that the load exceeds a specified value. The power transmission from the power storage device to the load may be interrupted, and the overload flag may be a power transmission cutoff flag that switches a value when the circuit breaker interrupts power transmission from the power storage device to the load.
If at least one of the above two configurations is adopted, it is possible to accurately grasp that the load in the building has become overloaded (exceeded the specified value), and to operate the power storage device at the time of overload. It becomes possible to accurately control the state (specifically, restriction on the return to the discharge state).

According to the power management system and the power management system of the present invention, when the operation state of the power storage device is changed from the discharge state to the stop state due to the load in the building exceeding the specified value, the user is notified of the situation through the notification device. Can be notified.
Further, when the operation state of the power storage device is changed from the discharge state to the stop state due to the load in the building exceeding the specified value, the power storage device does not respond to the information notified by the notification device. Returning the operating state to the discharging state is limited. As a result, it is possible to suppress a situation in which the load in the building remains above the specified value, so that even if the state of the power storage device is returned to the discharge state, the state is again switched to the stop state.

It is a figure which shows the electric power supply mechanism in this embodiment. It is an apparatus block diagram which shows the power management system which concerns on this embodiment. It is the figure which showed an example of the power management screen. It is a figure which shows an example of the apparatus abnormality alerting | reporting information displayed on the error alerting | reporting area | region in FIG. It is a figure which shows an example of the overload alerting | reporting information displayed on the error alerting | reporting area | region in FIG. It is a figure which shows the table which shows the correspondence of an error content and alerting | reporting information. It is a figure which shows the structure of the control apparatus which concerns on this embodiment. It is a figure which shows the structure of the alerting | reporting apparatus which concerns on this embodiment. It is a figure which shows the structure of the electrical storage apparatus control unit which concerns on this embodiment. It is a figure which shows the flow of a schedule driving | operation. It is a figure which shows the flow of an electrical storage apparatus data acquisition process. It is a figure which shows the flow of a discharge process.

Hereinafter, a power management system and a power management method according to an embodiment of the present invention (hereinafter, this embodiment) will be described with reference to FIGS.
FIG. 1 is a diagram showing a power supply mechanism in the present embodiment. FIG. 2 is a device configuration diagram illustrating the power management system according to the present embodiment. FIG. 3 is a diagram illustrating an example of a power management screen. FIG. 4 is a diagram showing an example of the device abnormality notification information displayed in the error notification area in FIG. FIG. 5 is a diagram illustrating an example of overload notification information displayed in the error notification area in FIG. 3. FIG. 6 is a diagram illustrating a table indicating a correspondence relationship between error contents and notification information. FIG. 7 is a diagram illustrating a configuration of the control device according to the present embodiment. FIG. 8 is a diagram illustrating a configuration of a notification device according to the present embodiment. FIG. 9 is a diagram illustrating a configuration of the power storage device control unit according to the present embodiment. FIG. 10 is a diagram showing a flow of schedule operation. FIG. 11 is a diagram illustrating the flow of the power storage device data acquisition process. FIG. 12 is a diagram showing the flow of the discharge process.

  The following description relates to a power management system that manages power consumption in a house H that is an example of a building. However, the house H is merely an example of a building, and the present invention can also be used in other buildings such as commercial buildings, buildings in factories, stores, and the like.

<< Outline of Power Management System According to this Embodiment >>
First, an overall outline of a power management system (hereinafter, system 1) according to the present embodiment will be described with reference to FIGS.
As shown in FIG. 1, the present system 1 receives power from a commercial power source 2 (hereinafter, system power) and supplies it to a load 5 in a house H, and includes a power storage unit 3 as a power storage device. The power storage unit 3 stores system power and discharges the stored power when supplying power to the load 5 in the house H. Here, the load 5 in the house H is a power load in the house H, that is, a power demand in the house H. Specifically, it depends on a group of electric devices installed in the house H. It is power consumption.

In the present embodiment, the operation state of the power storage unit 3 includes a power storage state in which power is stored, a discharge state in which the stored power is discharged, and a stop state in which neither power storage nor discharge is performed. , Can be switched to any one state. And in this system 1, it is possible to switch the driving | running state of the electrical storage unit 3 remotely.
Note that if the load 5 in the house H is overloaded while the operation state of the power storage unit 3 is in the discharge state, the operation state of the power storage unit 3 is automatically switched from the discharge state to the stop state. Here, being overloaded means that the magnitude of the load 5 in the house H exceeds a specified value, and in this embodiment, the magnitude of the load 5 is the output limit capacity (power storage capacity) of the power storage unit 3. This is the maximum power that the unit 3 can output instantaneously, which means, for example, exceeding 4 kW).

  On the other hand, the system 1 monitors the load 5 in the house H, and presents information regarding the load status in the house H to the user (for example, a resident of the house H). That is, the present system 1 is a so-called HEMS, which visualizes (visualizes) the load situation in the house H and presents the visualized information to the user. Thus, this system 1 which comprises HEMS reduces the load 5 in the house H by monitoring the load 5 in the house H and presenting information visualizing the load state to the user. Motivation (awareness) is given to the user. Thereby, the user grasps the load situation in the house H from the presented information, and performs an operation for reducing the load 5 in the house H (that is, a load reduction operation) according to the load situation. Become.

In the present embodiment, the operation state of each electrical device in the house H that constitutes the load 5 can be remotely controlled through a network (hereinafter referred to as a home network) built in the house H. Here, the operation state of the electric device is a controllable (adjustable) content related to the operation of the electric device such as on / off of the electric device, operation modes such as cooling and heating, operation control values such as set temperature It is the concept which shows.
The home network is configured by, for example, a wired IP network using an Ethernet (registered trademark) cable or a wireless IP network using IEEE 802.1x or Bluetooth (registered trademark).

  The functions of the system 1 that have been outlined so far are mainly that the home server 10 installed in the house H communicates with the communication target device in the house H (specifically, a sensor 6 and an electric device described later) through the home network. It is realized by communicating with.

  In the present system 1, an information terminal 20 described later is used as an interface when a user performs remote operation of an electric device or confirms a visualized load state. Specifically, by operating the information terminal 20 in the house H, the user displays a power management screen (see FIG. 3), which will be described later, on the display of the information terminal 20, and the load status through the power management screen. Can be visually recognized, and remote control of electrical equipment can be performed.

  The home server 10 corresponds to the control device of the present invention, and can remotely control the operation state of the power storage unit 3. Further, in the present system 1, it is possible to monitor the state of the power storage unit 3 (hereinafter referred to as status) and notify the user if there is an abnormality in the status. In addition, the load 5 in the house H is excessive. When the power storage unit 3 stops due to a load, it is possible to notify the user of the situation through the information terminal 20 and request the user to reduce the load. This content will be described in detail later.

<< Power supply in house H >>
Below, the electric power supply mechanism in this embodiment is demonstrated.
First, the power supply mode in the house H in this embodiment and the power supply circuit laid to supply power to the load 5 will be described.
In the present embodiment, as described above, it is possible to supply the discharge power and the grid power from the power storage unit 3 to the load 5 in the house H. In addition, if the system further includes a power generation facility that generates power using natural energy such as sunlight, the generated power is used as the power supplied to the load 5 in addition to the discharge power from the power storage unit 3 and the system power. It is good.

  The embodiment of supplying power to the load 5 in this embodiment will be described in more detail. When supplying the discharge power from the power storage unit 3 to the load 5, only the discharge power is supplied and the system power is supplied to the load 5. In contrast, only the grid power is supplied.

  Specifically, the discharge power and the grid power from the power storage unit 3 are both supplied to the load via the distribution board 4, and a circuit (hereinafter referred to as a load side) is provided between the distribution board 4 and the load 5. Circuit T0) is laid. Two circuits are joined upstream of the load side circuit T0. One circuit is a circuit extending from the power storage unit 3 (hereinafter referred to as a first circuit T1), and the other circuit is connected to system power. It is a circuit (hereinafter, second circuit T2) extended from a power receiving facility (not shown) provided for receiving power. Here, the load-side circuit T0 and the first circuit T1 constitute a power supply circuit (hereinafter referred to as a storage unit-routed circuit) from the power storage unit 3 to the load 5, and the load-side circuit T0 and the second circuit T2 A power supply circuit (hereinafter referred to as a direct connection circuit) in which the power receiving facility and the load 5 are directly connected via the panel 4 is configured.

  Moreover, as shown in FIG. 1, the breaker 35 with which the electrical storage unit 3 was equipped is connected to the 1st circuit T1. The breaker 35 corresponds to a circuit breaker for interrupting power transmission from the power storage unit 3 to the load 5, and is in a closed state when supplying power to the load 5 through the circuit via the power storage unit. When the power supply through is interrupted, it is open. On the other hand, a circuit cutoff switch SW is provided in the middle of the second circuit T2, and is closed when power is supplied to the load 5 through the direct connection circuit. When it is interrupted, it is open.

  The breaker 35 and the circuit cutoff switch SW are interlocked with each other, and when one is closed, the other is open. That is, in the present embodiment, only one of the power storage unit via circuit and the direct connection circuit is in a conductive state.

  With the configuration as described above, when the discharge power from the power storage unit 3 is supplied to the load 5, only the circuit via the power storage unit is turned on, and the discharge power is supplied to the load 5 through the circuit. . On the other hand, of course, only the grid power is supplied to the load 5 while the discharge from the power storage unit 3 is stopped.

  In the present embodiment, the circuit that supplies the system power to the load 5 changes according to the size of the load 5. More specifically, when the magnitude of the load 5 when a current exceeding a predetermined value flows through the breaker 35 is a reference value, and the magnitude of the load 5 is equal to or less than the reference value, the grid power passes through the storage unit It is supplied to the load 5 through the circuit. That is, when the current flowing through the breaker 35 is equal to or less than a predetermined value, the grid power is supplied to the load 5 via (passing through) the power storage unit 3. On the other hand, when the size of the load 5 is larger than the reference value, the system power is supplied to the load 5 through the direct connection circuit. That is, when the current flowing through the breaker 35 exceeds a predetermined value, the breaker 35 is opened, and the circuit cutoff switch SW is closed in conjunction with this, so that the system power is supplied to the load 5 through the direct connection circuit. become.

  Next, the configuration of the power storage unit 3 will be described. As shown in FIG. 1, the power storage unit 3 includes a storage battery 31 that is a main part of the power storage unit 3, a charger 32, an inverter 33, a battery management unit (hereinafter referred to as BMU) 34, and the breaker 35 described above. Has been. The storage battery 31 is a device provided for the power storage unit 3 to store system power. The charger 32 is a device that converts system power from AC power to DC power when storing the storage battery 31. The inverter 33 is a device that converts the power stored in the storage battery 31 (in other words, the power stored in the power storage unit 3) from DC power to AC power and outputs the converted power.

  The system power is converted from AC power to DC power by the charger 32 arranged upstream of the storage battery 31, and the power converted by the charger 32 is stored in the storage battery 31. On the other hand, since the electric power discharged from the storage battery 31 becomes direct current power, when it is supplied to the load 5, it is converted into alternating current power by the inverter 33 arranged downstream of the storage battery 31. The electric power converted by the inverter 33 is supplied to the load 5 through the above-described circuit via the storage unit. The magnitude of the output power of the inverter 33 is determined according to the magnitude of the load 5 in the house H. When the load 5 is overloaded, the output power exceeds the set value. It becomes an abnormal state (error state) called inverter overload.

  The BMU 34 controls the storage battery 31 and the breaker 35 and monitors the state of each part of the power storage unit 3. More specifically, the BMU 34 communicates with the home server 10 via the home network, receives a control signal output from the home server 10, and switches power storage and discharge by the storage battery 31 according to the control signal. Control the opening and closing of the breaker 35. In addition, when an abnormality (error) occurs in each part of the power storage unit 3, the BMU 34 detects the error, communicates with the home server 10, and notifies the occurrence of the error (specifically, described later) Error flag data) is transmitted to the home server 10.

Next, an operation mode of the power storage unit 3 will be described.
As described above, the operation state of the power storage unit 3 can be switched to any one of the power storage state, the discharge state, and the stop state. In this embodiment, the operation state can be switched remotely. is there. More specifically, when the home server 10 outputs a control signal and the BMU 34 receives the control signal through the home network, the BMU 34 switches between storing and discharging power in the storage battery 31. As a result, the operation state of the power storage unit 3 is switched.

  Further, in the present system 1, two modes are prepared as modes for switching the operation state of the power storage unit 3, and one mode is a manual operation mode for switching the operation state of the power storage unit 3 in response to a user request. Another mode is a schedule operation mode in which the operation state of the power storage unit 3 is automatically switched at a predetermined time every day.

  And when operating the electrical storage unit 3 in the manual operation mode, when operating the electrical storage unit 3 in the schedule operation mode during the period in which the user selects the discharge, a preset discharge period is set. The electric power stored in the power storage unit 3 is discharged and supplied to the load 5. In the present embodiment, once the discharge starts, in principle, the discharge state is maintained until the discharge ends (that is, until the remaining capacity of the power storage unit 3 runs out). As a result, the operating state of the power storage unit 3 can be prevented from frequently switching between the power storage state and the discharge state, and the efficiency of discharging (output) the power stored in the power storage unit 3 can be improved.

  On the other hand, if the load 5 exceeds the specified value (4 kW) while the operation state of the power storage unit 3 is in the discharge state, the operation state of the power storage unit 3 is switched from the discharge state to the stop state. The power supplied to 5 is switched to the system power.

Next, the function of the BMU 34 described above will be described more specifically. The BMU 34 monitors the status of the power storage unit 3 and transmits data indicating the status (hereinafter, power storage unit data) to the home server 10. Here, the status is a general concept for specifying the state of the power storage unit 3. In this embodiment, the status includes the operation state of the power storage unit 3, whether there is an error, the cell temperature and the cell voltage of the storage battery 31. Needless to say, contents other than this (for example, SOC (remaining capacity), integrated value of the discharge amount and the storage amount) may be included.
In the system 1, the home server 10 periodically acquires the power storage unit data from the BMU 34. In the present embodiment, the data is acquired every 30 seconds. However, the data acquisition interval can be arbitrarily set.

  Regarding the presence / absence of an error among the statuses, data notifying the occurrence of the error is transmitted from the BMU 34 to the home server 10 when the error occurs. More specifically, when the BMU 34 detects an error, the error flag value corresponding to the content of the error among the error flags stored in the BMU 34 is changed. Then, the BMU 34 generates error flag data indicating a change in the value of the error flag, and transmits the data to the home server 10. The home server 10 receives the error flag data and identifies information (specifically, the value of the corresponding error flag) indicated by the data, thereby detecting an error that has occurred in the power storage unit 3.

The contents of errors monitored in the present embodiment include “inverter failure”, “charger failure”, “breaker trip”, and “inverter overload”. Of course, other contents ( For example, “overcharge” and “overdischarge”) may be included.
Then, the power storage unit data including the error flag data is stored in the home server 10 as log information after being received by the home server 10.

<< About the power management screen >>
Hereinafter, a power management screen drawn on the display of the information terminal 20 will be described.
In describing the power management screen, the information terminal 20 will be briefly described. The information terminal 20 is a terminal having a browsing function and can communicate with the home server 10 through a home network. In particular, the information terminal 20 according to the present embodiment is configured by a portable terminal such as a smartphone, a PDA, a notebook computer, or a digital photo frame on which predetermined application software is installed.

  And the information terminal 20 receives the data transmitted from the home server 10 by communicating with the home server 10 via a home network, and notifies the user of information indicated by the data. That is, the information terminal 20 corresponds to the notification device of the present invention, and in the present embodiment, character information and drawing information are presented to the user. Furthermore, the information terminal 20 includes a touch panel 21 as a display (see FIG. 3), and the touch panel 21 also functions as a reception unit that receives a user operation. The user operations received by the touch panel 21 serving as the receiving unit include operations for requesting the home server 10 to transmit data, operations for causing the home server 10 to perform remote control of electric devices, and the like. It is done.

  The power management screen illustrated in FIG. 3 is drawn on the touch panel 21 of the information terminal 20 as described above, and the user can check the current load status or operate the electrical equipment in the house H through the power management screen. It is possible to remotely control the state. Furthermore, in this embodiment, when an error occurs in the power storage unit 3, it is possible to notify the user of the occurrence of the error through the power management screen. In addition, when the operation state of the power storage unit is switched from the discharge state to the stop state due to the load 5 in the house H being overloaded while the power storage unit 3 is in the discharge state, While notifying the user of the situation, it is possible to request the user to reduce the load.

  More specifically, when the user performs a predetermined operation on the touch panel 21 (for example, an operation of touching an icon displayed on the touch panel 21), the program is activated, and power management is performed on the touch panel 21 by the activation of this program. The screen will be drawn. As shown in FIG. 3, the power management screen is divided into three display areas. The rectangular area located at the upper side is the device control area S1, and the rectangular area located on the lower right side is the load display area. A rectangular area located on the lower left side in S2 is an error notification area S3.

  The device control area S1 is an area for accepting a user operation in controlling the operation state of the electric equipment used in the house H. As shown in FIG. 3, the area S1 includes an installation place of the electric equipment, A button Bt for controlling the type of the electric device and the operation state of the electric device is displayed for each electric device used in the house H. Among the buttons Bt, the button Bt located on the leftmost side of the screen (the button Bt indicated as ON in FIG. 3) is a button for switching the operating state of the corresponding electrical device to the ON state, and is adjacent to the right side of the button Bt. The button Bt (button Bt indicated as OFF in FIG. 3) located at is a button Bt for switching the operation state of the corresponding electrical device to the off state. Furthermore, for an electric device (in the case shown in FIG. 3, an air conditioner and a water heater) that can switch an operation management value such as a set temperature, a button Bt (in FIG. 3) for changing the operation management value. A button Bt) labeled 1 ° C. above or 1 ° C. below is displayed.

  Then, the user selectively presses the button Bt corresponding to the electric device to be controlled and the control condition among the above-described buttons Bt displayed in the device control area S1, thereby controlling according to the pressed button. Processing can be requested from the home server 10. That is, by the operation of selectively pressing the button Bt, the user can specify an electric device whose operation state is controlled by the home server 10 and an operation management value (that is, a control condition) after the control. .

  The load display area S2 is an area for presenting the size of the load 5 in the house H to the user. Specifically, as shown in FIG. 3, the total power consumption value in the house H is displayed in the area S2. Is displayed. Data for displaying the size of the load 5 in the load display area S2 (hereinafter referred to as load display data) is generated by the home server 10 and received and expanded on the information terminal 20 side. The magnitude of the load 5 is displayed in the display area S2.

  The error notification area S3 is an area for notifying the user of information related to an error that has occurred in the power storage unit 3. In the present embodiment, information (hereinafter referred to as notification information) displayed in the error notification area S3 is text information, notification error information indicating the content of the error that has occurred, and handling information indicating a method for dealing with the error Consists of. Furthermore, the types of notification error information are roughly classified into device abnormality notification information indicating device abnormality such as inverter failure and charger failure, and overload notification information indicating that the load 5 is overloaded.

  More specifically, for example, when a charger failure occurs in the power storage unit 3 as an error of device abnormality, the error notification area S3 displays “charger failure! ”Device abnormality notification information M1 and“ Please stop immediately ”as a countermeasure against the error. Is displayed as coping information Ma1. In the error notification area S3, device abnormality notification information and countermeasure information are displayed, and a confirmation button Bu1 operated by the user when the information is confirmed (button Bu1 marked OK in FIG. 4). Is displayed.

  Further, when the load 5 is overloaded when the operation state of the power storage unit 3 is in the discharge state, and the operation state of the power storage unit 3 is switched from the discharge state to the stop state, the error notification area S3 is displayed in FIG. As shown, “Power consumption is too big! "Please review the operation of the electrical equipment as the overload notification information Mo" and the character information requesting to reduce the load 5. Is displayed as coping information Mao. In the error notification area S3, overload notification information and countermeasure information are displayed, and a confirmation button Bu2 operated by the user when the information is confirmed (button Bu2 marked OK in FIG. 5). Is displayed.

  As described above, in the present system 1, when the operation state of the power storage unit 3 is changed from the discharge state to the stop state due to the load 5 in the house H being overloaded, the information terminal 20 (more specifically, Can notify the user of the situation through the power management screen.

  Note that the data for displaying the notification information in the error notification area S3 (hereinafter referred to as notification data) is generated by the home server 10 and received and expanded on the information terminal 20 side, thereby the error notification area. The notification information is displayed in S3. Moreover, the error content and the notification information (that is, the device abnormality notification information M1, M2,... And the overload notification information Mo, and the countermeasure information Ma1, Ma2,... Mao) displayed when the error occurs. The correspondence relationship is stored in the home server 10 as the table X shown in FIG. 6. When the notification data is generated, the table X is referred to, and notification information corresponding to the error content is stored in the error notification area S3. Generate data to be displayed.

<< Detailed structure of each part of this system >>
Below, detailed structure is demonstrated about BMU34 of the home server 10, the information terminal 20, and the electrical storage unit 3 among the apparatuses which comprise this system 1. FIG.
1) Home Server 10 The home server 10 is also called a home gateway. As shown in FIG. 2, the CPU 10a, the memory 10b, the non-volatile storage device 10c, and the communication interface 10d (in FIG. These elements are connected via a bus 10e.
Various programs are stored in the non-volatile storage device 10c, and the home server 10 exhibits the above-described functions when the programs are read and executed by the CPU 10a.

  The structure of the home server 10 will be described again in terms of functions. As shown in FIG. 7, the home server 10 includes a measurement data acquisition unit 101, a power storage unit data acquisition unit 102, a storage unit 103, a load display data generation unit 104, a notification. The data generation unit 105, the data transmission unit 106, the electric device control unit 107, the power storage unit control unit 108 and the response operation detection unit 109 are included. Each part of the home server 10 includes a CPU 10a, a memory 10b, a nonvolatile storage device 10c, a communication interface 10d, and a program.

  The measurement data acquisition unit 101 acquires measurement data indicating a measurement result of the sensor 6 through a home network by communicating with a power sensor (hereinafter referred to as sensor 6) installed in the house H. The sensor 6 will be described below. The sensor 6 is installed at an upstream position of the load 5 (more specifically, a position in the middle of the load side circuit T0 described above), and the magnitude of the load in the house H, that is, the total in the house H is described. Measure power consumption. In this embodiment, the measurement of power consumption by the sensor 6 is always performed at predetermined intervals, and the measurement data is transmitted from the sensor 6 to the home server 10 every time new data is acquired. That is, the measurement data acquisition unit 101 acquires measurement data from the sensor 6 at predetermined intervals. The acquired measurement sensor is temporarily stored in the memory 10b of the home server 10 and then stored in the nonvolatile storage device 10c.

  In the present embodiment, the power consumption measurement by the sensor 6 is always performed at a predetermined interval as described above, and the measurement data is transmitted to the home server 10 every time new data is acquired. However, the present invention is not limited to this. For example, the measurement of power consumption may be performed only in a time zone in which the power consumption in the entire house H is a certain value or more. As for the transmission of measurement data to the home server 10, for example, the measurement data is temporarily stored on the sensor 6 side, and when the data transmission is requested from the home server 10 side to the sensor 6, the measurement data is collected. It is good also as transmitting.

Further, in the present embodiment, the sensor 6 measures at predetermined intervals and transmits data indicating the actual measurement value of the measurement. For example, the sensor 6 performs measurement at intervals of one second, and immediately after every minute. An average value of 60 measurement results may be obtained, and data indicating the average value may be transmitted as measurement data.
Further, regarding the measurement of the power consumption by the sensor 6, in addition to measuring the total power consumption in the house H, the power consumption may be measured for each circuit provided in the distribution board 4.

  The power storage unit data acquisition unit 102 acquires data indicating the status of the power storage unit 3 through the home network by communicating with the BMU 34 of the power storage unit 3. As described above, the process (storage unit data acquisition process) by the storage unit data acquisition unit 102 is periodically executed, and is executed every 30 seconds in the present embodiment.

  In addition, the power storage unit data acquisition unit 102 receives error flag data transmitted from the BMU 34 when an error occurs in the power storage unit 3, and information indicated by the error flag data (specifically, a corresponding error flag). The error generated in the power storage unit 3 is detected.

  More specifically, when the power storage unit data acquisition unit 102 receives device abnormality flag data as error flag data, the power storage unit data acquisition unit 102 detects a device abnormality as an error that has occurred in the power storage unit 3. Here, the device abnormality flag data is the error flag stored in the BMU 34, and the value of the device abnormality flag that changes when a device abnormality such as an inverter failure or a charger failure occurs. It is data indicating that the value has been obtained. In particular, in the present embodiment, the device abnormality flag includes an error flag (inverter failure flag) for the content of inverter failure and an error flag (charger failure flag) for the content of charger failure.

  On the other hand, when the storage unit data acquisition unit 102 receives the overload flag data as error flag data immediately after the operation state of the storage unit 3 is switched from the discharge state to the stop state, the load 5 in the house H becomes overloaded. Thus, it is detected that the operation state of the power storage unit 3 has been switched from the discharge state to the stop state. In this sense, the power storage unit data acquisition unit 102 corresponds to the overload detection unit of the present invention.

  Here, the overload flag data changes among the error flags stored in the BMU 34 when the load 5 is overloaded (that is, when the magnitude of the load 5 exceeds a specified value). This is data indicating that the value of the overload flag is an overload value that is a value when the load 5 is overloaded. In particular, in the present embodiment, the overload flag is an error flag for the content “inverter overload”, that is, an inverter overload flag whose value changes when the output power of the inverter 33 exceeds a set value. That's it. The set value set for the magnitude of the output power of the inverter 33 is a reference value for determining whether or not the load 5 is overloaded, and the output limit capacity (4 kW) of the power storage unit 3. It is decided according to.

  The memory | storage part 103 memorize | stores the measurement data which the measurement data acquisition part 101 acquired, and the electrical storage unit data which the electrical storage unit data acquisition part 102 acquired. As described above, the power storage unit data is stored in the storage unit 103 as log information and is made into a database. The storage unit 103 stores a table X (see FIG. 6) indicating a correspondence relationship between the content of the error that has occurred in the power storage unit 3 and the notification information that is displayed on the information terminal 20 side when the error occurs. The table X is referred to by the notification data generation unit 105 when the notification data generation unit 105 described later creates notification data.

  The load display data generation unit 104 generates data for displaying the size of the load 5 in the house H in the load display area S2 in the power management screen described above, that is, load display data. When generating the load display data, the load display data generation unit 104 reads the latest data among the measurement data stored in the storage unit 103, and generates the load display data based on the read data.

  The notification data generation unit 105 corresponds to the data generation unit of the present invention. When an error occurs in the power storage unit 3, the notification data generation unit 105 displays notification information corresponding to the error in the error notification region S3 in the power management screen. Data, that is, notification data. Specifically, when the power storage unit data acquisition unit 102 acquires error flag data and the data is stored in the storage unit 103, the notification data generation unit 105 newly stores the error flag stored in the storage unit 103. Read data. Then, the notification data generation unit 105 identifies the content of the error that has occurred in the power storage unit 3 based on the read data, and creates notification data corresponding to the error content.

  More specifically, when the read error flag data is device abnormality flag data, the notification data generation unit 105 generates notification data so that the device abnormality notification information and the countermeasure information are displayed in the error notification area S3. To do. The notification data is data for causing the information terminal 20 to notify the information terminal 20 that the device abnormality has occurred in accordance with the detection result that the power storage unit data acquisition unit 102 has detected the device abnormality as an error (device abnormality). Notification data).

  On the other hand, when the read error flag data is overload flag data, the notification data generation unit 105 generates notification data so that the overload notification information and the handling information are displayed in the error notification area S3. This notification data notifies the information terminal 20 that the load 5 in the house H has been overloaded to the user in accordance with the detection result that the power storage unit data acquisition unit 102 has detected an overload as an error. This corresponds to the data (overload notification data).

  Note that the notification data generation unit 105 refers to the table X stored in the storage unit 103 when generating notification data. Then, the notification data generation unit 105 displays notification information corresponding to the read error flag data (notification information corresponding to the content of the error specified from the error flag data) according to the correspondence shown in the table X. The notification data to be created is created.

  The data transmission unit 106 transmits data generated by the load display data generation unit 104 and the notification data generation unit 105 (that is, load display data and notification data) to the information terminal 20 through the home network.

  The electric equipment control unit 107 remotely controls the operation state of the electric equipment provided in the house H. The electrical device control unit 107 receives an electrical device control request transmitted from the information terminal 20 and analyzes the request. As a result, the electric device control unit 107 selects the electric device and the operating condition specified by the user on the power management screen (specifically, the button Bt pressed by the user among the buttons Bt displayed in the device control area S1). Identify the corresponding electrical equipment and operating conditions). And the electric equipment control part 107 outputs the control signal according to the specified driving | running condition toward the specified electric equipment. When this control signal is received by the electrical device that is the control target, the operating state of the electrical device that is the control target is switched to a state corresponding to the control signal.

  The power storage unit control unit 108 corresponds to the switching unit of the present invention, and communicates with the BMU 34 of the power storage unit 3 to switch the operation state of the power storage unit 3. For example, when the mode for switching the operation state of the power storage unit 3 is the schedule operation mode, the power storage unit control unit 108 switches the operation state of the power storage unit 3 to the power storage state when the time set as the power storage start time is reached. When the time set as the start time comes, the operation state of the power storage unit 3 is switched to the discharge state.

  The response operation detection unit 109 detects a user response operation to information notified by the information terminal 20 based on the overload notification data generated by the notification data generation unit 105. Specifically, the overload notification data generated by the notification data generation unit 105 is transmitted to the information terminal 20 by the data transmission unit 106, and is drawn on the touch panel 21 in the information terminal 20 that has received the data. In the power management screen, the overload notification information and the handling information are presented in the error notification area S3.

  Then, the response operation detection unit 109 detects the user's load reduction operation as the user's response operation to the overload notification information and the handling information. In the present embodiment, the user load reduction operation is an operation performed by the user on the information terminal 20 side in order to reduce the load 5 in the house H. Specifically, in order to reduce the load 5 described above. This is an operation of selectively pressing the button Bt displayed in the device control area S1 on the power management screen to switch the operation state of the electric device. When such an operation is received on the information terminal 20 side, data indicating that the operation has been executed (hereinafter referred to as reception data) is generated and transmitted from the information terminal 20 to the home server 10. The response operation detection unit 109 detects the user's load reduction operation by receiving the reception data transmitted from the information terminal 20.

  Furthermore, in the present embodiment, when the operation state of the power storage unit 3 is switched from the discharge state to the stop state due to the load 5 being overloaded while in the discharge state, the response operation detection unit 109 displays the user action Until the load reduction operation is detected, the power storage unit control unit 108 restricts the operation state of the power storage unit 3 from returning to the discharge state.

  More specifically, the fact that the load 5 in the house H is overloaded while the operation state of the power storage unit 3 is in the discharged state means that an inverter overload error has occurred, In such a case, the operation state of the power storage unit 3 is switched from the discharge state to the stop state. As the inverter overload error occurs, the value of the inverter overload flag changes to the value when the load 5 is overloaded, that is, the overload value (specifically “1”). Error flag data (overload flag data) indicating that the value of the load flag has become an overload value is transmitted from the BMU 34 to the home server 10. And if the above-mentioned electrical storage unit data acquisition part 102 receives said overload flag data, the driving | running state of the electrical storage unit 3 will switch from a discharge state to a stop state because the load 5 in the house H became an overload. Is detected.

  Thereafter, the operation state of the power storage unit 3 is maintained in the stopped state until the response operation detection unit 109 detects the user's load reduction operation according to the above procedure. On the other hand, when the response operation detection unit 109 detects the load reduction operation of the user, the response operation detection unit 109 outputs a flag value switching signal for returning the value of the inverter overload flag from the overload value to the non-overload value to the BMU 34. Here, the non-overload value is a value when the load 5 is not overloaded, that is, a value when the magnitude of the load 5 does not exceed the specified value. It is.

  When the flag value switching signal is received on the BMU 34 side, the value of the inverter overload flag returns from the overload value to the non-overload value. In the case of the present embodiment, the power storage unit control unit 108 discharges the operating state of the power storage unit 3 from when the value of the inverter overload flag becomes the overload value until it returns to the non-overload value. Restrict return to

  As described above, in the present system 1, when the operation state of the power storage unit 3 is changed from the discharge state to the stop state due to the load 5 in the house H being overloaded, the information notified by the information terminal 20 As long as the user does not respond to (overload notification information and countermeasure information), the operation state of the power storage unit 3 is restricted from being returned to the discharge state. As a result, it is possible to suppress a situation in which the state of the power storage unit 3 is returned to the discharge state while the load 5 in the house H remains overloaded, and then switches to the stop state again.

  As described above, in the present system 1, even if the load 5 in the house H is overloaded and the operation state of the power storage unit 3 is changed from the discharge state to the stop state, the situation is left unattended. This makes it possible to effectively use the power stored in the power storage unit 3. Such an effect is particularly effective in a system in which the power supplied to the load 5 is automatically switched to the system power when the discharge of the power storage unit 3 is stopped.

Specifically, in the configuration in which the power supplied to the load 5 is automatically switched to the system power when the discharge of the power storage unit 3 is stopped, the power supply to the load 5 is performed even if the power supply is switched. Since the user is persistent, the user is unaware of the situation and tends to leave it unattended. In such a case, as a result of consuming more system power, the power charge increases.
On the other hand, in the present system 1, the load 5 in the house H is overloaded, and the operation state of the power storage unit 3 is switched from the discharge state to the stop state. When the system power is switched to the system power, the user is notified of the overloaded situation, so the user can be aware of the situation and avoid consuming system power more than necessary. Can do.

  Further, in the present embodiment, as long as the user does not perform the load reduction operation (that is, the load 5 is not reduced), the operation state of the power storage unit 3 is restricted from being returned to the discharge state. Thereby, since the load 5 in the house H remains overloaded, it is possible to more effectively suppress a situation in which the operation state of the power storage unit 3 is switched to the stop state again even if the operation state is returned to the discharge state. Is possible.

2) About the information terminal 20 As described above, the information terminal 20 is a terminal having a browsing function, and serves as an interface when a user remotely operates an electric device or visually recognizes a load in the house H. Used. As shown in FIG. 2, the information terminal 20 includes a CPU 20a, a memory 20b, a non-volatile storage device 20c, a communication interface 20d (indicated as communication I / F in FIG. 2), and a touch panel 21. The elements are connected via a bus 20e.
Various programs are stored in the non-volatile storage device 20c, and a program for drawing the above-described power management screen on the touch panel 21 is included.

  The structure of the information terminal 20 will be described again from the functional aspect. As shown in FIG. 8, the information terminal 20 includes a data transmission request unit 201, a data reception unit 202, an information display unit 203, and an operation reception unit 204. Among these components constituting the information terminal 20, the data transmission request unit 201, the data receiving unit 202, and the information display unit 203 are configured by a CPU 20a, a memory 20b, a nonvolatile storage device 20c, a communication interface 20d, and a program. Yes. The operation receiving unit 204 includes a CPU 20a, a memory 20b, a nonvolatile storage device 20c, a communication interface 20d, a touch panel 21, and a program.

  The data transmission request unit 201 communicates with the home server 10 through the home network, and requests the home server 10 to transmit data of information to be displayed on the touch panel 21. For example, when the data transmission request unit 201 starts a program for drawing a power management screen on the information terminal 20, the load display data (the size of the load 5 in the house H in the load display area S2 in the power management screen) is displayed. The home server 10 is requested to transmit data for displaying the data.

  The data receiving unit 202 transmits data transmitted from the home server 10 through the home network (specifically, load display data and notification data (notification information corresponding to an error occurring in the power storage unit 3) in the power management screen. Data for display in the error notification area S3)) is received.

  The information display unit 203 displays information indicated by the data on the touch panel 21 based on the data received by the data receiving unit 202. Specifically, when the data receiving unit 202 receives the load display data, the information display unit 203 displays the size of the load 5 in the house H in the load display region S2 in the power management screen based on the data ( That is, the total power consumption value in the house H is displayed (see FIG. 3).

  When the data receiving unit 202 receives the device abnormality notification data, the information display unit 203 displays the device abnormality notification information and the countermeasure information in the error notification region S3 in the power management screen based on the data (FIG. 4). reference). Further, when the data receiving unit 202 receives the overload notification data, the information display unit 203 displays the overload notification information and the countermeasure information in the error notification area S3 in the power management screen based on the data (FIG. 5). reference). The countermeasure information displayed together with the overload notification information is presented to the user as character information for requesting the user to reduce the load 5, as shown in FIG.

The operation accepting unit 204 accepts a user operation through the touch panel 21. User operations accepted by the operation accepting unit 204 include a data transmission request operation, an electric device control request operation, a power storage unit control request operation, and a notification information confirmation operation.
The data transmission request operation is an operation for requesting the home server 10 to transmit data.

  The electric equipment control request operation is an operation for causing the home server 10 to perform remote control of the electric equipment. Specifically, the power management screen is used to designate the electric equipment to be controlled and the operating conditions. This is an operation of selectively pressing the button Bt displayed in the device control area S1. Then, when the overload notification information and the countermeasure information are displayed in the error notification area S3 in the power management screen, the electric device control request operation executed by the user to reduce the load 5 of the house H is the above-described load. Corresponds to reduction action.

The storage unit control request operation is, for example, an operation for requesting the home server 10 to switch the operation state of the storage unit 3 while the operation mode switching mode of the storage unit 3 is the manual operation mode. It is.
The notification information confirmation operation is an operation for notifying that the notification information (equipment abnormality notification information, overload notification information, and countermeasure information) displayed in the error notification area S3 of the power management screen has been confirmed. This is an operation of pressing the confirmation buttons Bu1 and Bu2 displayed in the error notification area S3.

  Then, when receiving each of the above-described user operations, the operation receiving unit 204 generates the above-described reception data as data indicating that the user operation has been executed, and transmits the data to the home server 10. The home server 10 that has received the received data identifies the user operation performed on the information terminal 20 side by analyzing the data, and a process corresponding to the identified user operation is executed. . For example, when the reception data of the electric device control request operation is received, the remote control processing of the operation state of the electric device by the electric device control unit 107 described above is executed as the processing according to the electric device control request operation. Become.

3) About BMU 34 The BMU 34 corresponds to a power storage device control unit, and as described above, monitors the status of the power storage unit 3 and transmits the power storage unit data indicating the status to the home server 10. As shown in FIG. 2, the BMU 34 includes a CPU 34a, a memory 34b, and a communication interface 34c (indicated as communication I / F in FIG. 2), and these elements are connected via a bus 34d. The memory 34b stores a program for controlling the power storage unit 3.

  The structure of the BMU 34 will be described again from the functional aspect. As shown in FIG. 9, the BMU 34 includes a flag storage unit 301 as a storage unit, a power storage unit data transmission unit 302, and an error flag data transmission unit as a flag data transmission unit. 303, a flag changing unit 304, and a device control unit 305. Among these units of the BMU 34, the flag storage unit 301 is configured by the memory 34b, and other than the flag storage unit 301 (specifically, the power storage unit data transmission unit 302, the error flag data transmission unit 303, the flag change unit 304, and The device control unit 305) includes a CPU 34a, a memory 34b, a communication interface 34c, and a power storage unit 3 control program.

  The flag storage unit 301 stores an error flag whose value changes when an error occurs. In the error flag, an inverter failure flag whose value changes when an error such as inverter failure occurs, a charger failure flag whose value changes when an error such as charger failure occurs, or an error such as inverter overload occurred Inverter overload flag whose value changes at the time, and breaker trip flag whose value changes when an error such as breaker trip occurs.

  Among the error flags, as described above, the inverter overload flag changes when the load 5 in the house H becomes overloaded (that is, when the size of the load 5 exceeds a specified value). This corresponds to the overload flag. The value of the inverter overload flag is an overload value when the load 5 is overloaded, and a non-overload value when the load 5 is not overloaded.

  The power storage unit data transmission unit 302 generates power storage unit data indicating the status of the power storage unit 3 and transmits the power storage unit data to the home server 10. In the present embodiment, the storage unit data acquisition process is periodically performed (at 30-second intervals) on the home server 10 side. Accordingly, the storage unit data transmission unit 302 generates and transmits the storage unit data accordingly. Is also done regularly. In the present embodiment, the data transmitted by the power storage unit data transmission unit 302 includes the operation state of the power storage unit 3, presence / absence of an error that has occurred (strictly, the value of each error flag), the cell of the storage battery 31 It shows temperature, cell voltage, and the like.

  The error flag data transmission unit 303 generates data indicating that the value of the error flag corresponding to the error has changed due to the occurrence of an error in the power storage unit 3, that is, error flag data. To be sent. In the present embodiment, the error flag data generated and transmitted by the error flag data transmission unit 303 includes device abnormality flag data and overload flag data as described above. In other words, the error flag data transmission unit 303, as a data indicating that the value of the device abnormality flag becomes the value when the device abnormality occurs when a device abnormality such as a charger failure or an inverter failure occurs. Abnormality flag data is generated and transmitted to the home server 10. Similarly, the error flag data transmission unit 303 uses overload flag data as data indicating that the value of the inverter overload flag, which is an overload flag, has become an overload value when the load 5 is overloaded. And the data is transmitted to the home server 10.

The flag changing unit 304 changes the value of the error flag corresponding to the error when an error occurs in the power storage unit 3 and changes the value of the error flag corresponding to the error when the error is resolved. It returns to the previous value (before the error occurred). For example, when the load 5 is overloaded, the flag changing unit 304 changes the value of the inverter overload flag, which is an overload flag, to an overload value.
On the other hand, when the load reduction operation is executed in the information terminal 20, as described above, the home server 10 (more specifically, the response operation detection unit 109 described above) detects the load reduction operation. A flag value switching signal is output. When the flag changing unit 304 receives the flag value switching signal through the home network, the flag changing unit 304 returns the value of the inverter overload flag from the overload value to the non-overload value according to the signal.

  The device control unit 305 controls the operation of the components of the power storage unit 3 excluding the BMU 34 (that is, the storage battery 31, the charger 32, the inverter 33, and the breaker 35). More specifically, the device control unit 305 receives a control signal output from the power storage unit control unit 108 of the home server 10 and switches power storage and discharge in the storage battery 31 according to the control signal. In addition, the device control unit 305 operates the charger 32 and the inverter 33 in conjunction with switching between storage and discharge of power in the storage battery 31. In addition, when the current flowing through the breaker 35 exceeds a predetermined value, the device control unit 305 opens the breaker 35 and interrupts power transmission from the power storage unit 3 to the load 5.

  Since the power storage unit 3 having the above-described configuration is provided, the present system 1 appropriately controls the operation state of the power storage unit 3 during an overload (specifically, restriction on return to the discharge state). It becomes possible to do. More specifically, in this embodiment, an overload flag, which is information indicating that the load 5 in the house H is overloaded, is stored on the power storage unit 3 side, and the response operation detection unit 109 is set by the user. When the load reduction operation is detected, processing for returning the value of the overload flag from the overload value to the non-overload value is executed on the power storage unit 3 side. As described above, in the present embodiment, since the overload flag is stored or updated on the power storage unit 3 side, for example, the regulation of the power load that becomes the determination criterion of the overload accompanying the change of the capacity of the power storage unit 3 or the like. Even if the value is changed, it is possible to accurately limit the return to the discharge state when the operation state of the power storage unit 3 is switched to the stop state due to overload.

To explain in an easy-to-understand manner, in the case where the overload flag is stored or updated on the home server 10 side (comparative example), the prescribed value of the power load that becomes the overload determination criterion in accordance with the change in the capacity of the storage battery 31 or the like When a change is made, it is necessary to modify (update) data (data such as setting values) and programs stored in the home server 10 to reflect the change. Furthermore, if the correction is neglected, there is a problem that the state of the power storage unit 3 cannot be returned from the stopped state to the discharged state even though it is not overloaded originally.
On the other hand, in the case of the present embodiment, as described above, since the overload flag is stored or updated on the power storage unit 3 side, it becomes a determination criterion for overload accompanying a change in the capacity of the storage battery 31 or the like. Even if the specified value of the power load is changed, the trouble of correcting the data (data such as setting values) stored in the home server 10 and the program is reduced as compared with the comparative example, and the occurrence of the above-described problems It is suppressed.

<< Power management method according to this embodiment >>
Hereinafter, a power management method using the system 1 will be described as a power management method according to the present embodiment. Hereinafter, a case where the mode for switching the operation state of the power storage unit 3 is the schedule operation mode will be described as an example. However, the power management method described below is applicable to the case where the mode for switching the operation state of the power storage unit 3 is the manual operation mode, except for the matters specific to the schedule operation mode.

  In the schedule operation mode, as described above, power storage is started every day when the time set as the power storage start time is reached, and discharge is started when the time set as the discharge start time is reached. More specifically, as shown in FIG. 10, it starts from specifying the current time (S001), and when the current time is the power storage start time, the power storage process is started (S002), and the power storage is completed. Until the specified amount of power is stored in the storage battery 31, the power storage process continues (S003). In the scheduled operation mode according to the present embodiment, the battery is stored only once every day, and when the power storage process starts once at the power storage start time, in principle, the power storage process is continuously executed until a specified amount of power is stored. Is done.

When the current time is the discharge start time, the discharge process is started (S004), and the discharge process is continued until the discharge is completed (until the remaining amount of power stored in the storage battery 31 runs out) ( S005). In the schedule operation mode according to the present embodiment, the battery is discharged only once every day, and as described above, once the discharge process starts once at the discharge start time, the power stored in the storage battery 31 is discharged in principle. The discharge process is continuously performed until
On the other hand, when the current time is neither the power storage start time nor the power storage start time, the operation state of the power storage unit 3 is maintained in a stopped state (standby state).

  By the way, in the present system 1, as described above, the home server 10 (more specifically, the power storage unit data acquisition unit 102) periodically acquires power storage unit data indicating the status of the power storage unit 3. If an error occurs in the error flag 3, error flag data indicating that the value of the error flag corresponding to the error has been acquired is acquired.

  More specifically, the processing (hereinafter referred to as “storage unit data acquisition processing”) will be described. The periodic processing for periodically acquiring storage unit data is executed every time a predetermined time (30 seconds in this embodiment) elapses. Is done. That is, as shown in FIG. 11, when a predetermined time has elapsed from the previous regular process (S011), the regular process is executed (S012). On the other hand, when an error occurs in the power storage unit 3 in a stage before a predetermined time elapses from the previous regular processing, that is, when error flag data is transmitted (S013), the data is received (S014). . If no error has occurred, the system waits until a predetermined time has elapsed.

Next, the flow of the above-described discharge process will be described in detail.
Immediately before starting the discharge process, the operation state of the power storage unit 3 is in a stopped state. As shown in FIG. 12, first, at the start of the discharge process, the home server 10 side checks whether there is an error in the power storage unit 3. (S021). The presence / absence of an error is confirmed by referring to the latest power storage unit data among the power storage unit data stored in the storage unit 103 of the home server 10. More specifically, by reading and analyzing the latest power storage unit data from the storage unit 103, the value of each error flag is specified, and the presence or absence of an error in the power storage unit 3 is determined based on the value.

  If there is an error, the discharge process is not started, and the power storage unit 3 stands by in a stopped state (S022). On the other hand, when there is no error, the power storage unit control unit 108 of the home server 10 switches the operation state of the power storage unit 3 to the discharge state (S023), and the discharge of the power stored in the storage battery 31 is started accordingly. (S024).

When the operation state of the power storage unit 3 is switched to the discharge state, the discharge is continued unless an error occurs in the power storage unit 3, and the discharge is completed when the remaining amount of power stored in the storage battery 31 is exhausted (S025). S026, S027, S028).
On the other hand, when an error occurs in the power storage unit 3 during the discharge (Yes in S025), the value of the error flag corresponding to the error is changed by the flag changing unit 304 in the BMU 34 of the power storage unit 3. Then, error flag data indicating the changed value is generated by the error flag data transmission unit 303 and transmitted to the home server 10.

  Thereafter, the home server 10 (more specifically, the power storage unit data acquisition unit 102) receives the error flag data through the home network (S029). At the same time, the power storage unit control unit 108 of the home server 10 outputs a control signal for switching the operation state of the power storage unit 3 from the discharge state to the stop state to the BMU 34 (S030), and the BMU 34 that has received the control signal The operation state of the power storage unit 3 is changed to a stopped state.

  Then, when the operation state of the power storage unit 3 is switched from the discharge state to the stop state during the discharge, the power storage unit data acquisition unit 102 of the home server 10 details the error that has occurred in the power storage unit 3 from the received error flag data. Is specified (S031). By this step S031, it is possible to detect an error that causes the operation state of the power storage unit 3 to switch from the discharge state to the stop state.

  More specifically, when the received error flag data is device abnormality flag data, it is detected that the operation state of the power storage unit 3 has been switched from the discharge state to the stop state due to the occurrence of the device abnormality as an error. On the other hand, when the received error flag data is overload flag data, it is detected that the operation state of the power storage unit 3 has been switched from the discharge state to the stop state due to the load 5 in the house H being overloaded. . In this sense, the above step 031 corresponds to the overload detection step of the present invention.

  When it is determined in step 031 that the content of the error is a device abnormality, the notification data generation unit 105 and the data transmission unit 106 of the home server 10 notify the information terminal 20 that a device abnormality has occurred to the user. Device abnormality notification data is generated and transmitted to the information terminal 20 (S032). When the device abnormality notification data is received by the information terminal 20, the device abnormality notification information and the handling information are displayed on the touch panel 21 of the information terminal 20 (specifically, the power management drawn on the touch panel 21) based on the data. It is displayed in the error notification area S3) on the screen.

  On the other hand, if it is determined in step 031 that the content of the error is an overload (in this embodiment, an inverter overload), the notification data generation unit 105 and the data transmission unit 106 of the home server 10 cause the user to The overload notification data for informing the information terminal 20 that the load 5 of the current load is overloaded is generated and transmitted to the information terminal 20 (S033). This step S033 corresponds to the data generation step of the present invention, and can be said to be a step of generating overload notification data by the home server 10 in accordance with the detection result in step 031 corresponding to the overload detection step.

  When the overload notification data is received by the information terminal 20, the overload notification information and the countermeasure information are displayed on the touch panel 21 of the information terminal 20 (specifically, the power management drawn on the touch panel 21) based on the data. It is displayed in the error notification area S3) on the screen. This step corresponds to the notification step of the present invention, and can be said to be a step of notifying the user of information that the load 5 of the house H is overloaded based on the overload notification data.

  Thereafter, when the user performs a load reduction operation to respond to the overload notification information and the handling information, the information terminal 20 (specifically, the touch panel 21) accepts the load reduction operation. When the response operation detection unit 109 of the home server 10 detects the load reduction operation accepted by the information terminal 20 by communicating with the information terminal 20 and receiving acceptance data from the information terminal 20 (S034), A control signal for returning the operation state of the unit 3 to the discharge state is transmitted from the home server 10 to the BMU 34 (S035), and the operation state of the power storage unit 3 that has received the control signal returns to the discharge state.

More specifically, when the user server's load reduction operation is detected by the home server 10, the flag value switching signal described above is transmitted from the response operation detection unit 109 of the home server 10 to the BMU 34. In the BMU 34 that has received the signal, the flag changing unit 304 causes the value of the inverter overload flag, which is an overload flag, to return from the overload value to the non-overload value.
Thereafter, when it is detected on the home server 10 side that the value of the inverter overload flag has returned to the non-overload value (for example, in the periodic processing of the storage unit data acquisition processing performed immediately after, the value of the inverter overload flag is When the storage unit data indicating that the value has returned to the non-overload value is acquired), a control signal for returning the operation state of the storage unit 3 to the discharge state is transmitted from the home server 10 to the BMU 34. Become. And the driving | running state of the electrical storage unit 3 which received the said control signal returns to a discharge state.

  On the other hand, unless the response operation detection unit 109 of the home server 10 detects the load reduction operation, the power storage unit control unit 108 of the home server 10 restricts the return of the operation state of the power storage unit 3 to the discharge state, and the power storage unit 3 In a stopped state (S036). That is, in the present embodiment, the home server 10 returns the operation state of the power storage unit 3 to the discharge state until the inverter overload flag value becomes the overload value and returns to the non-overload value. No control signal is transmitted for this purpose.

  As described above, in the power management method according to the present embodiment, the response operation detection step (specifically, the load reduction operation for the overload notification information and the countermeasure information notified by the information terminal 20 is detected by the home server 10 (specifically, The above-described step 034) and a switching step (in the specific period, the above-described steps S035 and 036) for switching the operation state of the power storage unit 3 by the home server 10 are included. Then, in the switching step, when the operation state of the power storage unit 3 is switched from the discharge state to the stop state due to the load 5 in the house H being overloaded, the user is executed by the home server 10 in the response operation detection step. Until the load reduction operation is detected, the return to the discharge state is limited.

<< Other Embodiments >>
In the above embodiment, the power management system and the power management method of the present invention have been described by way of an example. However, the above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

  For example, in the above embodiment, the power management system that manages the load 5 in the entire house H has been described. That is, in the system according to the above embodiment, when the load 5 in the house H becomes overloaded, the load 5 is overloaded while the operation state of the discharging power storage unit 3 is switched to the stopped state. The overload notification data for notifying the user of this is generated. However, the present invention is not limited to this, and a power management system (hereinafter referred to as a system according to a modified example) that mainly manages the load on a specific area in the house H (for example, a floor or a room specified by the user). ).

More specifically, in the system according to the modification, it is possible to supply the discharge power from the power storage unit 3 to a load in a specific area in the house H. That is, a power supply circuit is laid between the power storage unit 3 and the load in the specific area, and the discharge power from the power storage unit 3 is supplied only to the load in the specific area. Further, in the system according to the modification, a circuit that supplies system power to a load in a specific area via the power storage unit 3 is provided, and while the discharge power from the power storage unit 3 cannot be supplied, It is possible to supply grid power to a load in a specific area. Here, the circuit that supplies the system power to the load in the specific area via the power storage unit 3 is a circuit that passes through the storage battery 31, the charger 32, and the inverter 33 among the circuits provided in the power storage unit 3. It is a circuit provided separately. In the system according to the modified example, while the discharge power from the power storage unit 3 is being supplied, the load in the specific area is the output limit capacity of the power storage unit 3 (in the system according to the modified example, for example, set to 1 kW) When the overload is exceeded, the operation state of the power storage unit 3 is switched from the discharge state to the stop state, and the grid power is supplied to the load via the power storage unit 3. Thereafter, the system according to the modified example executes the same processing as when the load 5 of the house H is overloaded in the above embodiment.
In the system according to the modification, only system power is supplied to the load in an area (non-specific area) other than the specific area in the house H.

In the above embodiment, the inverter overload flag whose value changes when the magnitude of the output power of the inverter 33 exceeds the set value is the overload flag, and the error data flag indicates the value of the inverter overload flag. Based on the above, it is determined that the operation state of the power storage unit 3 has been switched from the discharge state to the stop state due to the load 5 in the house H being overloaded. However, the error flag used as the overload flag is not limited to the inverter overload flag. For example, an error flag for the content of “breaker trip”, that is, the current flowing through the breaker 35 exceeds a predetermined value, and the breaker 35 A breaker trip flag whose value changes when the is opened may be used as an overload flag. Here, the breaker trip flag corresponds to a power transmission cutoff flag whose value is switched when the breaker 35 cuts off the power transmission from the power storage unit 3 to the load 5.
If at least one of the inverter overload flag and the breaker trip flag is an overload flag, it is possible to accurately grasp that the load 5 in the house H has become overloaded. It becomes possible to accurately control the operation state of the power storage unit 3 at the time (specifically, restriction on return to the discharge state).
An error flag other than the inverter overload flag and breaker trip flag may be used as the overload flag.

  In the above embodiment, the return of the operation state of the power storage unit 3 to the discharge state is limited until the response operation detection unit 109 of the home server 10 detects the response operation of the user. In the present embodiment, the response operation of the user is a load reduction operation. Specifically, the electric device control request operation (more specifically, performed through the touch panel 21 of the information terminal 20 so as to reduce the load 5 of the house H). Specifically, the operation is an operation of selecting and pressing the button Bt displayed in the device control area S1 of the power management screen in order to specify an electric device to be controlled and an operation condition. However, the present invention is not limited to this, and response operations other than those described above may be used. For example, this is performed to notify that the user has confirmed the notification information displayed in the error notification area S3 of the power management screen. It may be a notification information confirmation operation (specifically, an operation of pressing confirmation buttons Bu1 and Bu2 displayed in the error notification area S3).

Further, in the above embodiment, the response operation detection unit 109 of the home server 10 transmits data transmitted from the information terminal 20 (specifically, the information terminal 20 to indicate that the user's load reduction operation has been executed). The user's load reduction operation is detected by receiving data generated on the side (the above-described received data). However, the present invention is not limited to this, and the user's load reduction operation may be detected based on data transmitted from other than the information terminal 20.
For example, when the user performs an electric device control request operation as a load reduction operation, the home server 10 outputs a control signal corresponding to the request to the electric device, and the operating state of the electric device is switched according to the control signal. In addition, data indicating the completion of control may be transmitted from the electric device side to the home server 10 and the user's load reduction operation may be detected by receiving the data. Alternatively, after the home server 10 controls the operating state of the electric device according to the load reduction operation of the user, the data (measurement data) indicating the measurement result of the sensor 6 is received and the value of the measurement result is reduced. It is good also as detecting a user's load reduction operation | movement by recognizing.

  In the above-described embodiment, the information terminal 20 having the browsing function is described as an example of the notification device. And in said embodiment, it decided to show a user the character information for alert | reporting that the load 5 of the house H was overloaded by the information terminal 20. FIG. However, it is not limited to this, For example, it is good also as using as an alerting | reporting apparatus the apparatus which alert | reports to a user by voice | voice, light, etc. that the load 5 of the house H became overloaded.

1 system 2 commercial power supply 3 power storage unit 4 distribution board 5 load 6 sensor 10 home server 10a CPU
10b Memory 10c Nonvolatile storage device 10d Communication interface 10e Bus 20 Information terminal 20a CPU
20b Memory 20c Nonvolatile memory device 20d Communication interface 20e Bus 21 Touch panel 31 Storage battery 32 Charger 33 Inverter 34 BMU
34a CPU
34b Memory 34c Communication interface 34d Bus 35 Breaker 101 Measurement data acquisition unit 102 Power storage unit data acquisition unit 103 Storage unit 104 Load display data generation unit 105 Notification data generation unit 106 Data transmission unit 107 Electrical device control unit 108 Power storage unit control unit 109 Response operation detection unit 201 Data transmission request unit 202 Data reception unit 203 Information display unit 204 Operation reception unit 301 Flag storage unit 302 Power storage unit data transmission unit 303 Error flag data transmission unit 304 Flag change unit 305 Device control unit Bt Buttons Bu1 and Bu2 Confirm button H Residential S1 Device control area S2 Load display area S3 Error notification area SW Circuit cutoff switch T0 Load side circuit T1 First circuit T2 Second circuit X Table

Claims (5)

A power storage device that stores power and discharges the stored power when supplying power to a load in the building;
A control device for controlling the operating state of the power storage device;
A power management system comprising: a notification device that notifies a user of information indicated by data transmitted from the control device;
The operation state of the power storage device is any one of a power storage state in which power is stored, a discharge state in which the stored power is discharged, and a stop state in which neither power storage nor discharge is performed. Can be switched to a state, and when the magnitude of the load exceeds a specified value while in the discharge state, the discharge state is switched to the stop state,
As a mode for switching the operation state of the power storage device, a schedule operation mode for discharging power stored in the power storage device during a preset discharge period is prepared,
The controller is
An overload detection unit that detects that the operation state of the power storage device has been switched from the discharge state to the stop state due to the magnitude of the load exceeding a specified value;
A data generation unit that generates overload notification data for notifying the notification device that the magnitude of the load has exceeded a specified value for a user according to a detection result of the overload detection unit;
A response operation detection unit that detects a user's load reduction operation as a user response operation to information notified by the notification device based on the overload notification data generated by the data generation unit;
And a toggle portion you switch the operating state of the electric storage device,
When switching the operation state of the power storage device in the scheduled operation mode, the switching unit switches the operation state of the power storage device to the discharge state at a time set as a discharge start time, and the magnitude of the load is When the operation state of the power storage device is switched from the discharge state to the stop state due to exceeding a specified value, the return to the discharge state is limited until the response operation detection unit detects the load reduction operation. A power management system characterized by that. The power storage device
A storage unit for storing an overload flag whose value changes when the magnitude of the load exceeds a specified value;
When the load magnitude exceeds a specified value, the overload flag indicates that the value of the overload flag has become an overload value that is a value when the load magnitude exceeds the specified value. A flag data transmission unit that generates data and transmits the data to the control device,
The overload detection unit receives the overload flag data transmitted from the flag data transmission unit, so that the operating state of the power storage device is changed to the discharge state when the magnitude of the load exceeds a specified value. Detecting that it has switched to the stop state from
When the response operation detection unit detects the load reduction operation, the value of the overload flag is a value when the magnitude of the load does not exceed a specified value from the overload value. A flag value switching signal to return to the power storage device,
The switching unit between said from the value of the overload flag is turned to the overload value before returning to the non-overload value, claim 1, characterized in that to limit the return to the discharged state The power management system described in 1. The power storage device includes an inverter that converts the power stored in the power storage device from DC power to AC power and outputs the inverter,
The magnitude of the output power of the inverter is determined according to the magnitude of the load,
The power management system according to claim 2 , wherein the overload flag is an inverter overload flag whose value changes when the magnitude of output power of the inverter exceeds a set value. The power storage device includes a circuit breaker for interrupting power transmission from the power storage device to the load,
The circuit breaker interrupts power transmission from the power storage device to the load when the size of the load exceeds a specified value,
3. The power management system according to claim 2 , wherein the overload flag is a power transmission cutoff flag whose value is switched when the circuit breaker interrupts power transmission from the power storage device to the load. A power storage device that stores power and discharges the stored power when supplying power to a load in the building;
A control device for controlling the operating state of the power storage device;
A power management method using a power management system comprising: a notification device for notifying a user of information indicated by data transmitted from the control device;
As a mode for switching the operation state of the power storage device, a schedule operation mode for discharging power stored in the power storage device during a preset discharge period is prepared,
While the operation state of the power storage device is in the discharge state discharging the stored power, the operation state of the power storage device is changed from the discharge state to the electric power when the magnitude of the load exceeds a specified value. An overload detection step of detecting by the control device that the state has been switched to a stop state in which neither storage nor discharge is performed;
According to the detection result in the overload detection step, a data generation step for generating overload notification data by the control device for notifying the user that the magnitude of the load exceeds a specified value;
Based on the overload notification data generated in the data generation step, a notification step of notifying a user of information that the magnitude of the load exceeds a specified value by the notification device;
As a response operation of the user to the information notified in the notification step, a response operation detection step of detecting a load reduction operation of the user by the control device,
A switching step of switching the operating state of the power storage device by the control device,
In the switching step, when the operation state of the power storage device is switched in the scheduled operation mode, the operation state of the power storage device is switched to the discharge state at a time set as a discharge start time, and the magnitude of the load is reduced. When the operation state of the power storage device is switched from the discharge state to the stop state due to exceeding a specified value, the return to the discharge state is performed until the load reduction operation is detected in the response operation detection step. A power management method characterized by limiting.

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