JP6646009B2 - Power management system, power management method, power control device, and distributed power source - Google Patents

Description

  The present invention relates to a management system, a management method, a control device, and a storage battery device having a storage battery device that charges and discharges power using a storage battery, and a control device that communicates with the storage battery device.

  In recent years, a power management system including a plurality of devices and a control device that controls the plurality of devices has been proposed (for example, Patent Document 1). The plurality of devices are, for example, home electric appliances such as an air conditioner and a lighting device, and distributed power sources such as a solar cell, a storage battery, and a fuel power generator. Controller, for example, HEMS (Home Energy Management System), SEMS (Store Energy Management System), BEMS (Building Energy Management System), FEMS (Factory Energy Management System), referred to as CEMS (Cluster / Community Energy Management System) Is done.

  In order to spread the management system described above, it is effective to use a common message format between a plurality of devices and a control device, and an attempt has been made to use such a common message format.

JP 2010-128810 A

  The above-mentioned common use of message formats has only just begun, and various studies are required on message formats for appropriately controlling devices.

  Then, this invention is made in order to solve the above-mentioned subject, and an object of this invention is to provide a management system, a management method, a control device, and a storage battery device which can control a device appropriately. .

  A management system according to a first feature includes a power storage device including a storage battery that stores power, and a control device that communicates with the power storage device. The control device transmits at least one of a message indicating a rated output of the storage battery and a message indicating the number of times of charging and discharging of the storage battery in an independent operation state in which the power storage device is disconnected from a system, and outputs the message to the power storage device. Receive from.

  In the first aspect, prior to communication of a message indicating a rated output of the storage battery in a self-sustaining operation state in which the power storage device is disconnected from a system, the control device includes a control unit configured to disconnect the power storage device from the system. A message indicating whether or not there is a function of transmitting a message indicating the rated output of the storage battery in the operating state is received from the power storage device.

  In the first aspect, the control device receives, from the power storage device, a message indicating whether or not there is a function of transmitting a message indicating the number of charge / discharge of the storage battery, prior to communication of the message indicating the number of charge / discharge of the storage battery. I do.

  A management method according to a second feature is a method used in a management system including a power storage device including a storage battery that stores power and a control device that communicates with the power storage device. The management method, from the power storage device to the control device, among the message indicating the rated output of the storage battery and the message indicating the number of times of charging and discharging of the storage battery in an independent operation state in which the power storage device is disconnected from the system, And transmitting at least one of the messages.

  The control device according to the third feature communicates with a power storage device including a storage battery that stores power. The control device transmits at least one of a message indicating the rated output of the storage battery and a message indicating the number of times of charging and discharging of the storage battery in the self-sustained operation state in which the power storage device is disconnected from the grid, from the power storage device. Receive.

  A power storage device according to a fourth aspect includes a storage battery that stores power. The power storage device, for a control device that communicates with the power storage device, a message indicating the rated output of the storage battery and a message indicating the number of times the storage battery has been charged and discharged in an independent operation state in which the power storage device is disconnected from the system. And a communication unit that transmits at least one of the messages to the control device.

  According to the present invention, it is possible to provide a management system, a management method, a control device, and a storage battery device capable of appropriately controlling devices.

FIG. 1 is a diagram illustrating an energy management system 100 according to the first embodiment. FIG. 2 is a diagram illustrating the consumer 10 according to the first embodiment. FIG. 3 is a diagram illustrating the fuel cell device 150 according to the first embodiment. FIG. 4 is a diagram illustrating a network configuration according to the first embodiment. FIG. 5 is a diagram illustrating the EMS 200 according to the first embodiment. FIG. 6 is a diagram showing a message format according to the first embodiment. FIG. 7 is a diagram showing a message format according to the first embodiment. FIG. 8 is a diagram showing a message format according to the first embodiment. FIG. 9 is a sequence diagram illustrating the management method according to the first embodiment.

  Hereinafter, a management system according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, it is needless to say that dimensional relationships and ratios are different between drawings.

[Overview of Embodiment]
A management system according to an embodiment includes a power storage device including a storage battery that stores power, and a control device that communicates with the power storage device. The control device is configured to output at least one of a message indicating a rated output of the storage battery and a message indicating the number of times of charging and discharging of the storage battery in an independent operation state in which the power storage device is disconnected from a grid. Receive from.

  In the embodiment, the control device can appropriately control other devices (load, fuel cell device) in the independent operation state by receiving a message indicating the rated output of the storage battery in the independent operation state from the power storage device. it can. Alternatively, the control device can determine the degree of deterioration of the storage battery by receiving a message indicating the number of times of charging and discharging the storage battery from the power storage device.

[First Embodiment]
(Energy management system)
Hereinafter, the energy management system according to the first embodiment will be described. FIG. 1 is a diagram illustrating an energy management system 100 according to the first embodiment.

  As shown in FIG. 1, the energy management system 100 includes a customer 10, a CEMS 20, a substation 30, a smart server 40, and a power plant 50. The customer 10, the CEMS 20, the substation 30, and the smart server 40 are connected by a network 60.

  The consumer 10 has, for example, a power generation device and a power storage device. The power generation device is a device that outputs electric power using fuel gas, such as a fuel cell. The power storage device is a device that stores power, such as a secondary battery.

  The customer 10 may be a single-family house or an apartment such as an apartment. Alternatively, the customer 10 may be a store such as a convenience store or a supermarket, a commercial facility such as a building, or a factory.

  In the first embodiment, a plurality of customers 10 constitute a customer group 10A and a customer group 10B. The customer group 10A and the customer group 10B are classified, for example, by geographical area.

  The CEMS 20 controls interconnection between the plurality of customers 10 and the power system. The CEMS 20 may be referred to as a CEMS (Cluster / Community Energy Management System) in order to manage a plurality of customers 10. Specifically, the CEMS 20 disconnects between the plurality of customers 10 and the power system at the time of a power failure or the like. On the other hand, the CEMS 20 interconnects the plurality of customers 10 and the power system at the time of power restoration or the like.

  In the first embodiment, CEMS 20A and CEMS 20B are provided. The CEMS 20A controls, for example, interconnection between the customers 10 included in the customer group 10A and the power system. The CEMS 20B controls, for example, interconnection between the customers 10 included in the customer group 10B and the power system.

  The substation 30 supplies power to a plurality of customers 10 via a distribution line 31. Specifically, the substation 30 reduces the voltage supplied from the power plant 50.

  In the first embodiment, a substation 30A and a substation 30B are provided. The substation 30A supplies power to the customers 10 included in the customer group 10A via the distribution line 31A, for example. The substation 30B supplies power to the customers 10 included in the customer group 10B via the distribution line 31B, for example.

  The smart server 40 manages a plurality of CEMSs 20 (here, CEMS 20A and CEMS 20B). In addition, the smart server 40 manages a plurality of substations 30 (here, the substation 30A and the substation 30B). In other words, the smart server 40 generally manages the customers 10 included in the customer group 10A and the customer group 10B. The smart server 40 has, for example, a function of balancing power to be supplied to the customer group 10A and power to be supplied to the customer group 10B.

  The power plant 50 generates power using thermal power, wind power, hydraulic power, nuclear power, and the like. The power plant 50 supplies power to the plurality of substations 30 (here, the substation 30A and the substation 30B) via the transmission line 51.

  The network 60 is connected to each device via a signal line. The network 60 is, for example, the Internet, a wide area network, a narrow area network, a mobile phone network, or the like.

(Consumer)
Hereinafter, the consumer according to the first embodiment will be described. FIG. 2 is a diagram illustrating details of the customer 10 according to the first embodiment.

  As shown in FIG. 2, the customer 10 includes a distribution board 110, a load 120, a PV device 130, a storage battery device 140, a fuel cell device 150, a hot water storage device 160, and an EMS 200.

  In the first embodiment, the customer 10 has an ammeter 180, an ammeter 181 and an ammeter 182.

  The ammeter 180 is used for load following control of the fuel cell device 150. The ammeter 180 is on the power line connecting each device (for example, the storage battery device 140 and the fuel cell device 150) and the system, downstream of the connection point between the storage battery device 140 and the power line (away from the system), and Are provided upstream (closer to the system) than the connection point between the fuel cell device 150 and the power line. Of course, the ammeter 180 is provided upstream (closer to the system) than the connection point between the load 120 and the power line.

  The ammeter 181 is used to confirm the presence or absence of the flow of power (reverse power flow) from the storage battery device 140 to the grid. The ammeter 181 is provided upstream (closer to the system) than the connection point between the storage battery device 140 and the power line on the power line connecting each device (for example, the storage battery device 140) and the system.

  The ammeter 182 is used to measure the power generated by the PV device 130. The ammeter 182 is provided closer to the PV device 130 than a connection point between the power line connecting each device (for example, the PV device 130) and the system and the PV device 130.

  It should be noted that, in the first embodiment, each device is connected to the power line in the order of the PV device 130, the storage battery device 140, the fuel cell device 150, and the load 120 when viewed from the order close to the system.

  The distribution board 110 is connected to the distribution line 31 (system). The distribution board 110 is connected to a load 120, a PV device 130, a storage battery device 140, and a fuel cell device 150 via a power line.

  The load 120 is a device that consumes power supplied via a power line. For example, the load 120 includes devices such as a refrigerator, a freezer, lighting, and an air conditioner.

  The PV device 130 has a PV 131 and a PCS 132. The PV 131 is an example of a power generation device, and is a solar power generation device that generates power in response to sunlight reception. The PV 131 outputs the generated DC power. The power generation amount of the PV 131 changes according to the amount of solar radiation applied to the PV 131. The PCS 132 is a device (Power Conditioning System) that converts DC power output from the PV 131 into AC power. The PCS 132 outputs AC power to the distribution board 110 via the power line.

  In the first embodiment, the PV device 130 may include a pyranometer that measures the amount of solar radiation applied to the PV 131.

  The PV device 130 is controlled by an MPPT (Maximum Power Point Tracking) method. Specifically, the PV device 130 optimizes the operating point of the PV 131 (the point determined by the operating point voltage value and the power value, or the point determined by the operating point voltage value and the current value).

  Storage battery device 140 has storage battery 141 and PCS 142. The storage battery 141 is a device that stores power. The PCS 142 is a device (Power Conditioning System) that converts AC power supplied from the distribution line 31 (system) into DC power. Further, PCS 142 converts DC power output from storage battery 141 into AC power.

  Here, storage battery device 140 operates according to any of a plurality of operation modes in which the reference for charging and discharging storage battery 141 is different.

  The plurality of operation modes include an operation mode in a system interconnection state and an operation mode in an independent operation state. The grid connection state is a state in which the storage battery device 140 and the grid are arranged in parallel. On the other hand, the self-sustaining operation state is a state in which the storage battery device 140 and the grid are disconnected. As an example of the self-sustaining operation state, for example, a state in which a power failure has occurred can be considered.

  The operation mode in the grid connection state is (a) an operation mode in which charging / discharging of the storage battery 141 is controlled so as to prioritize power selling (reverse power flow) of the power generated by the PV device 130 (solar power purchase priority mode). ), (B) an operation mode (solar charge mode) for controlling charging and discharging of the storage battery 141 so as to charge the storage battery 141 with the power generated by the PV device 130, and (c) power supplied from the system is constant. An operation mode (peak cut mode) for controlling the charging and discharging of the storage battery 141 so as not to exceed the value, and (d) supply from the grid during a period in which the unit price of the power supplied from the grid is lower than a threshold (for example, at night). Operation mode (midnight power utilization mode) for controlling charging and discharging of the storage battery 141 so as to charge the storage battery 141 with the power to be stored, and (e) operation for forcibly storing power in the storage battery 141. Mode (forced power storage mode), and the like (f) operating mode that forcibly discharges the power stored in the battery 141 (forced discharge mode).

  Here, in (a) the solar power purchase priority mode and (b) the solar charge mode, the storage battery device 140 monitors the current measured by the ammeter 182 and responds to the amount of power generated by the PV device 130. It is necessary to control the charging and discharging of the storage battery 141. Since the power generation amount of the PV device 130 changes every moment, it is preferable that these operation modes are controlled by the storage battery device 140.

  Similarly, in (c) peak cut mode, the storage battery device 140 monitors the current measured by the ammeter 181 and the ammeter 182, and charges and discharges the storage battery 141 in accordance with the amount of power supplied from the grid. Need to be controlled. The amount of power supplied from the grid is a value obtained by removing the power measured by the ammeter 182 from the power measured by the ammeter 181. Since the power generation amount of the PV device 130 and the power consumption of the load 120 change every moment, this operation mode is preferably controlled by the storage battery device 140.

  In the first embodiment, (a) the solar power purchase priority mode, (b) the solar charge mode, and (c) the peak cut mode are examples of operation modes in which the PV 131 other than the storage battery 141 and the storage battery 141 cooperate.

  The operation mode in the self-sustained operation state includes (g) an operation mode for accumulating electric power generated by the PV device 130 (hereinafter, an autonomous power storage mode), and (h) a load 120 connected to an autonomous outlet provided in the storage battery device 140. (Hereinafter referred to as “independent supply mode”), (i) supplying power to the load 120 connected to the independent outlet provided in the storage battery device 140 while accumulating the power generated by the PV device 130 Operating mode (hereinafter, an independent power supply mode).

  Further, as a control common to all operation modes, the storage battery device 140 monitors the current measured by the ammeter 181 so that a flow of power (reverse power flow) from the storage battery device 140 to the grid does not occur. It is necessary to control the charging and discharging of the storage battery 141. Since the power consumption of the load 120 changes every moment, these operation modes are preferably controlled by the storage battery device 140.

  In the first embodiment, a message specifying one of a plurality of operation modes is defined between the EMS 200 and the storage battery device 140. Here, the message designating any one of the plurality of operation modes includes a time when the operation is started in the specified operation mode, a time when the operation is completed in the specified operation mode, and a time when the operation is performed in the specified operation mode. It is preferable to include For example, in the mode (d), it is necessary to specify a time such as when to start charging at midnight or when to start discharging at daytime.

  The message specifying one of the plurality of operation modes includes information indicating whether the specified operation mode is an operation mode in a system interconnection state or whether the specified operation mode is an operation mode in an independent operation state. Is preferred.

  For example, storage battery device 140 receives from EMS 200 a message designating any of a plurality of operation modes. Storage battery device 140 operates in one of a plurality of operation modes according to the message received from EMS 200. Alternatively, storage battery device 140 transmits a message designating any one of the plurality of operation modes to EMS 200. The EMS 200 obtains which of the plurality of operation modes the EMS 200 is operating on from a message received from the storage battery device 140.

  In addition, prior to communication of a message designating any of the plurality of operation modes, storage battery device 140 transmits a message indicating whether or not there is a function for handling a message designating any of the plurality of operation modes to EMS 200.

  In the first embodiment, the storage battery device 140 transmits a message indicating the rated output of the storage battery 141 to the EMS 200. The message indicating the rated output of the storage battery 141 includes at least information indicating the rated output of the storage battery 141 in the independent operation state. The message indicating the rated output of the storage battery 141 may include information indicating the rated output of the storage battery 141 in the system interconnection state. Here, when the EMS 200 controls other devices (for example, the fuel cell device 150 and the load 120), the rated output of the storage battery 141 in the autonomous operation state is important information for the EMS 200.

  In addition, prior to communication of the message indicating the rated output of storage battery 141, storage battery device 140 transmits a message indicating the presence or absence of a function of transmitting a message indicating the rated output of storage battery 141 to EMS 200.

  In the first embodiment, the storage battery device 140 transmits to the EMS 200 a message indicating the number of times the storage battery 141 has been charged and discharged. The message indicating the number of charge / discharge of the storage battery 141 includes at least the number of charge / discharge of the storage battery 141 in the current state. The message indicating the number of times of charging and discharging of the storage battery 141 may include the maximum number of times of charging and discharging of the storage battery 141. Here, in determining the degree of deterioration of the storage battery 141, the number of times of charging and discharging of the storage battery 141 is important information for the EMS 200.

  In addition, prior to communication of the message indicating the number of times of charging / discharging of storage battery 141, storage battery device 140 transmits to EMS 200 a message indicating whether there is a function of transmitting a message indicating the number of times of charging / discharging of storage battery 141.

  In the first embodiment, for example, the PCS 142 constitutes a communication unit that receives the above-described message from the EMS 200 or transmits the message to the EMS 200. Alternatively, the PCS 142 constitutes a control unit that controls charging and discharging of the storage battery 141 in accordance with the operation mode of the storage battery 141, for example. However, the communication unit and the control unit may be provided on a control board provided separately from the PCS 142.

  The fuel cell device 150 has a fuel cell 151 and a PCS 152. The fuel cell 151 is an example of a power generation device, and is a device that generates electric power using fuel (gas). The PCS 152 is a device (Power Conditioning System) that converts DC power output from the fuel cell 151 into AC power.

  The fuel cell device 150 operates by load following control. Specifically, the fuel cell device 150 controls the fuel cell 151 such that the power output from the fuel cell 151 becomes the target power for the load following control. In other words, the fuel cell device 150 controls the power output from the fuel cell 151 so that the current value detected by the ammeter 180 becomes the target received power.

  Hot water storage device 160 is a device that generates hot water or maintains water temperature using fuel (gas). Specifically, hot water storage device 160 has a hot water storage tank, and supplies water supplied from the hot water storage tank by heat generated by combustion of fuel (gas) or exhaust heat generated by operation (power generation) of fuel cell 151. warm. Specifically, hot water storage device 160 warms the water supplied from the hot water storage tank and returns the heated hot water to the hot water storage tank.

  It should be noted that in the embodiment, the fuel cell device 150 and the hot water storage device 160 constitute a hot water supply unit 170 (hot water supply system).

  The EMS 200 is a device (Energy Management System) that controls the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160. Specifically, the EMS 200 is connected to the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160 via signal lines, and the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160 is controlled. Further, the EMS 200 controls the power consumption of the load 120 by controlling the operation mode of the load 120.

  The EMS 200 is connected to various servers via the network 60. The various servers store information (hereinafter, energy fee information) such as a purchase price of power supplied from the grid, a sale price of power supplied from the grid, and a purchase price of fuel gas.

  Alternatively, various servers store, for example, information for predicting the power consumption of the load 120 (hereinafter, energy consumption prediction information). The energy consumption prediction information may be generated, for example, based on a past power consumption value of the load 120. Alternatively, the energy consumption prediction information may be a model of the power consumption of the load 120.

  Alternatively, the various servers store, for example, information for predicting the power generation amount of the PV 131 (hereinafter, PV power generation amount prediction information). The PV power generation prediction information may be a predicted value of the amount of solar radiation applied to the PV 131. Alternatively, the PV power generation prediction information may be a weather forecast, a season, a sunshine duration, or the like.

(Fuel cell device)
Hereinafter, the fuel cell device according to the first embodiment will be described. FIG. 3 is a diagram illustrating the fuel cell device 150 according to the first embodiment.

  As shown in FIG. 3, the fuel cell device 150 includes a fuel cell 151, a PCS 152, a blower 153, a desulfurizer 154, an ignition heater 155, and a control board 156.

  As described above, the fuel cell 151 is a device that outputs power using fuel gas. Specifically, the fuel cell 151 has a reformer 151A and a cell stack 151B.

  The reformer 151A generates a reformed gas from the fuel gas from which the odorant has been removed by the desulfurizer 154 described later. The reformed gas is a gas composed of hydrogen and carbon monoxide.

  The cell stack 151B generates power by a chemical reaction between air (oxygen) supplied from a blower 153 described later and the reformed gas. Specifically, the cell stack 151B has a structure in which a plurality of cells are stacked. Each cell has a structure in which an electrolyte is sandwiched between a fuel electrode and an air electrode. A reformed gas (hydrogen) is supplied to the fuel electrode, and air (oxygen) is supplied to the air electrode. A chemical reaction of the reformed gas (hydrogen) and air (oxygen) occurs in the electrolyte to generate electric power (DC electric power) and heat.

  The PCS 152 is a device that converts DC power output from the fuel cell 151 into AC power, as described above.

  The blower 153 supplies air to the fuel cell 151 (cell stack 151B). The blower 153 is configured by, for example, a fan.

  The desulfurizer 154 removes the odorant contained in the fuel gas supplied from the outside. The fuel gas may be city gas or propane gas.

  The ignition heater 155 is a heater that ignites fuel that has not chemically reacted in the cell stack 151B (hereinafter, unreacted fuel) and maintains the temperature of the cell stack 151B at a high temperature. That is, the ignition heater 155 ignites the unreacted fuel leaking from the openings of the cells constituting the cell stack 151B. It should be noted that the ignition heater 155 only needs to ignite the unreacted fuel in a case where the unreacted fuel is not burning (for example, when starting the fuel cell device 150). Once the fuel is ignited, the unreacted fuel that slightly overflows from the cell stack 151B continues to burn, so that the temperature of the cell stack 151B is maintained at a high temperature.

  The control board 156 is a board on which a circuit for controlling the fuel cell 151, the PCS 152, the blower 153, the desulfurizer 154, the ignition heater 155, and the control board 156 is mounted.

  In the first embodiment, the cell stack 151B is an example of a power generation unit that generates power by a chemical reaction. The reformer 151A, the blower 153, the desulfurizer 154, the ignition heater 155, and the control board 156 are examples of auxiliary devices that assist the operation of the cell stack 151B. Further, a part of the PCS 152 may be treated as an auxiliary device.

(Network configuration)
Hereinafter, a network configuration according to the first embodiment will be described. FIG. 4 is a diagram illustrating a network configuration according to the first embodiment.

  As shown in FIG. 5, the network includes a load 120, a PV device 130, a storage battery device 140, a fuel cell device 150, a hot water storage device 160, an EMS 200, and a user terminal 300. The user terminal 300 includes a user terminal 310 and a user terminal 320.

  The user terminal 310 is connected to the EMS 200, and information for visualizing the energy consumption of each device (the load 120, the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160) (hereinafter, visualization information). Is displayed by a web browser. In such a case, the EMS 200 generates visualization information in a format such as HTML, and transmits the generated visualization information to the user terminal 310. The connection type between the user terminal 310 and the EMS 200 may be wired or wireless.

  The user terminal 320 is connected to the EMS 200, and displays visualization information by an application. In such a case, the EMS 200 transmits information indicating the energy consumption of each device to the user terminal 320. The application of the user terminal 320 generates visualization information based on the information received from the EMS 200, and displays the generated visualization information. The connection form between the user terminal 320 and the EMS 200 may be wired or wireless.

  As described above, in the first embodiment, the fuel cell device 150 and the hot water storage device 160 configure the hot water supply unit 170. Therefore, hot water storage device 160 may not have a function of communicating with EMS 200. In such a case, the fuel cell device 150 communicates with the EMS 200 on behalf of the hot water storage device 160 for messages relating to the hot water storage device 160.

  In the first embodiment, communication between the EMS 200 and each device (the load 120, the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160) is performed by a method according to a predetermined protocol. Examples of the predetermined protocol include a protocol called “ECHONET Lite” or “ECHONET”. However, the embodiment is not limited to this, and the predetermined protocol may be a protocol other than “ECHONET Lite” and “ECHONET”.

(Configuration of EMS)
Hereinafter, the EMS according to the first embodiment will be described. FIG. 5 is a block diagram illustrating the EMS 200 according to the first embodiment.

  As illustrated in FIG. 5, the EMS 200 includes a receiving unit 210, a transmitting unit 220, and a control unit 230.

  The receiving unit 210 receives various signals from devices connected via signal lines. For example, the receiving unit 210 may receive information indicating the power generation amount of the PV 131 from the PV device 130. The receiving unit 210 may receive, from the storage battery device 140, information indicating the amount of power stored in the storage battery 141. The receiving unit 210 may receive information indicating the amount of power generated by the fuel cell 151 from the fuel cell device 150. Receiving section 210 may receive information indicating the amount of hot water stored in hot water storage apparatus 160 from hot water storage apparatus 160.

  In the first embodiment, the receiving unit 210 may receive the energy fee information, the energy consumption prediction information, and the PV power generation amount prediction information from various servers via the network 60. However, the energy fee information, the energy consumption prediction information, and the PV power generation amount prediction information may be stored in the EMS 200 in advance.

  In the first embodiment, the receiving unit 210 receives, from the storage battery device 140 (for example, the PCS 142), a message specifying one of a plurality of operation modes in which the charging and discharging standards of the storage battery 141 are different from each other. Thereby, receiving section 210 acquires which of the plurality of operation modes the storage battery device 140 is operating. Alternatively, receiving section 210 receives a message indicating the rated output of storage battery 141 from storage battery device 140 (for example, PCS 142). Alternatively, receiving section 210 receives from storage battery device 140 (for example, PCS 142) a message indicating the cumulative number of times of charging and discharging of storage battery 141. In other words, PCS 142 of storage battery device 140 constitutes a communication unit that transmits the above-described message.

  In the first embodiment, prior to communication of a message specifying one of a plurality of operation modes, the receiving unit 210 transmits a message indicating whether or not there is a function for handling a message specifying one of the plurality of operation modes to the storage battery device. Received from 140. Alternatively, receiving section 210 receives from storage battery device 140 a message indicating whether or not there is a function of transmitting a message indicating the rated output of storage battery 141, prior to communication of the message indicating the rated output of storage battery 141. Alternatively, the receiving unit 210 receives, from the storage battery device 140, a message indicating whether or not there is a function of transmitting a message indicating the number of times of charging and discharging of the storage battery 141, prior to communication of the message indicating the number of times of charging and discharging of the storage battery 141.

  The transmission unit 220 transmits various signals to devices connected via signal lines. For example, the transmission unit 220 transmits a signal for controlling the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160 to each device. The transmission unit 220 transmits a control signal for controlling the load 120 to the load 120.

  In the first embodiment, the transmission unit 220 transmits a message designating any one of a plurality of operation modes to the storage battery device 140 (for example, the PCS 142). Thereby, transmitting section 220 instructs storage battery device 140 on the operation mode of storage battery 141. Alternatively, transmitting section 220 transmits a message requesting the rated output of storage battery 141 to storage battery device 140. Alternatively, transmitting section 220 transmits to storage battery device 140 a message requesting the number of times of charging and discharging storage battery 141.

  In the first embodiment, the transmission unit 220 requests a message indicating the presence or absence of a function for handling a message that specifies one of a plurality of operation modes, prior to communication of a message that specifies one of a plurality of operation modes. The message is transmitted to storage battery device 140. Alternatively, transmitting section 220 transmits a message requesting a message indicating whether or not there is a function of transmitting a message indicating the rated output of storage battery 141 to storage battery device 140 prior to communication of the message indicating the rated output of storage battery 141. Alternatively, before transmitting the message indicating the number of times of charging / discharging of storage battery 141, transmitting section 220 transmits a message requesting a message indicating the presence or absence of a function of transmitting a message indicating the number of times of charging / discharging of storage battery 141 to storage battery device 140. Send to

  The control unit 230 controls the load 120, the PV device 130, the storage battery device 140, the fuel cell device 150, and the hot water storage device 160.

(Message format)
Hereinafter, a message format according to the first embodiment will be described. 6 to 8 are diagrams illustrating an example of a message format according to the first embodiment.

  First, a message designating any one of a plurality of operation modes having different charging / discharging standards for the storage battery 141 has, for example, a format shown in FIG. As shown in FIG. 6, the message has a message type field and an operation mode field.

  The message type field indicates the type of the message, and in the first embodiment, indicates that the message includes the operation mode.

  The operation mode field indicates the operation mode of the storage battery 141. As described above, the operation modes include (a) solar power purchase priority mode, (b) solar charge mode, (c) peak cut mode, (d) midnight power utilization mode, (e) forced power storage mode, f) forced discharge mode, (g) autonomous power storage mode, (h) autonomous power supply mode, (i) autonomous power storage supply mode, and the like.

  Second, the message indicating the rated output of the storage battery 141 has, for example, the format shown in FIG. As shown in FIG. 7, the message has a message type field and a rated output field.

  The message type field indicates the type of the message, and in the first embodiment, indicates that the message includes a rated output.

  The rated output field indicates the rated output of the storage battery 141. The rated output field includes at least information indicating the rated output of the storage battery 141 in the independent operation state. The rated output field may include information indicating the rated output of the storage battery 141 in the system interconnection state.

  Third, the message indicating the number of times of charging and discharging of the storage battery 141 has, for example, the format shown in FIG. As shown in FIG. 8, the message has a message type field and a charge / discharge count field.

  The message type field indicates the type of the message, and in the first embodiment, indicates that the message includes the number of times of charge and discharge.

  The rated output field indicates the number of times the storage battery 141 has been charged and discharged. The field of the number of times of charge / discharge includes at least the number of times of charge / discharge of the storage battery 141 in the current state. The field of the number of times of charging / discharging may include the maximum number of times of charging / discharging of the storage battery 141.

(Management method)
Hereinafter, a management method according to the first embodiment will be described. FIG. 9 is a sequence diagram illustrating the management method according to the first embodiment.

  As shown in FIG. 9, in step 10, EMS 200 transmits a message (code group request) to storage battery device 140 requesting a code group corresponding to storage battery device 140. The code group request is an example of a message requesting a message indicating the presence or absence of a function that handles a message that specifies one of a plurality of operation modes in which the criteria for charging and discharging the storage battery 141 are different from each other. Alternatively, the code group request is an example of a message requesting a message indicating the presence or absence of a function of transmitting a message indicating the rated output of the storage battery 141. Alternatively, the code group request is an example of a message requesting a message indicating whether or not there is a function of transmitting a message indicating the number of times of charging and discharging the storage battery 141.

  In step 20, storage battery device 140 transmits a message (code group response) indicating a code group corresponding to storage battery device 140 to EMS 200. The code group response is an example of a message indicating the presence or absence of a function for handling a message that specifies one of a plurality of operation modes in which the criteria for charging and discharging the storage battery 141 are different from each other. Alternatively, the code group response is an example of a message indicating the presence or absence of a function of transmitting a message indicating the rated output of the storage battery 141. Alternatively, the code request is an example of a message indicating the presence or absence of a function of transmitting a message indicating the number of times of charging and discharging of the storage battery 141 (the number of times of charging and discharging).

  In step 30, EMS 200 transmits to storage battery device 140 a message specifying one of a plurality of operation modes in which the criteria for charging and discharging storage battery 141 are different from each other. Upon receiving the message, storage battery device 140 determines the mode specified from the message and switches its own state to the specified mode. Thereby, the EMS 200 instructs the storage battery device 140 of the operation mode of the storage battery 141. In addition, storage battery device 140 may respond to EMS 200 that the mode switching instruction has been received or that the mode switching has been completed.

  After a while, in step 40, the EMS 200 transmits a message (operation mode request) requesting the storage battery device 140 to be notified of the operation mode of the storage battery 141.

  In step 50, storage battery device 140 transmits a message indicating the operation mode of storage battery 141 (operation mode response) to EMS 200 as a response to the request.

  In step 60, the EMS 200 transmits a message (rated output request) requesting the storage battery device 140 to be notified of the rated output of the storage battery 141.

  In step 70, storage battery device 140 transmits a message indicating the rated output of storage battery 141 (rated output response) to EMS 200. Here, the response of the rated output includes both the rated output and the output during the self-sustaining operation, but includes information on the output corresponding to whether the system is currently connected to the grid or is self-sustaining. You may have.

  In step 80, the EMS 200 transmits a message (a charge / discharge number request) requesting the storage battery device 140 to be notified of the number of charge / discharge times of the storage battery 141.

  In step 90, storage battery device 140 transmits a message (charge / discharge count response) indicating the cumulative number of charge / discharge of storage battery 141 to EMS 200.

  As described above, in the first embodiment, the charge / discharge control of the storage battery 141 in accordance with the operation mode of the storage battery 141 is entrusted to the storage battery device 140, and any one of a plurality of operation modes in which the reference of charge / discharge of the storage battery 141 is different. Is defined. Thus, the EMS 200 can appropriately control the storage battery device 140 without being affected by the communication delay between the EMS 200 and the storage battery device 140. Further, the EMS 200 can grasp the power generation amount of the storage battery device 140 and the like, and can appropriately control other devices (load, fuel cell device, and the like).

  In the first embodiment, the EMS 200 appropriately controls other devices (load, fuel cell device) in the independent operation state by receiving a message indicating the rated output of the storage battery 141 in the independent operation state from the storage battery device 140. can do. Alternatively, the EMS 200 can determine the degree of deterioration of the storage battery 141 by receiving a message indicating the number of times of charging and discharging the storage battery 141 from the storage battery device 140. Specifically, in the case of a battery having a relatively strong relationship between the number of charge / discharge cycles and the degree of deterioration, such as a lithium ion battery, it can be calculated to some extent.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the description and drawings forming part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art.

  For example, it is assumed that the system is operated in the idling mode during a power outage. However, if there is a demand for electric power at the load, not only the fuel cell 151 itself supplies electric power to the auxiliary device but also the power supply to the fuel cell device 150. A self-sustaining operation mode may be used in which the output of the fuel cell 151 is increased so as to obtain output power that meets the demand at the load. That is, the self-sustaining operation mode and the idling mode are different from each other in whether or not to output the generated power externally, but are common in that the power supply to the auxiliary devices is covered by self-generated power during a system power failure. For this reason, the two modes in which power is supplied to the auxiliary devices by self-power generation during a system power failure may be referred to as a self-supply mode for convenience.

  Further, in the temperature maintenance mode, the power consumption of the auxiliaries is covered by the power supply from the system, but may be covered by the output of the PV device 130 or the storage battery device 140.

  The EMS 200 may be a HEMS (Home Energy Management System), a SEMS (Store Energy Management System), or a BEMS (Building Energy Management or Fast Energy Management System). There may be.

  In the embodiment, the customer 10 includes a load 120, a PV device 130, a storage battery device 140, a fuel cell device 150, and a hot water storage device 160. However, the customer 10 only needs to have at least the storage battery device 140.

  In the embodiment, (a) the solar power purchase priority mode, (b) the solar charge mode, and (c) the peak cut mode have been exemplified as the operation modes in which the storage battery 141 and other devices other than the storage battery 141 cooperate. However, embodiments are not limited to this. For example, the operation mode of the storage battery 141 may include an operation mode in which the storage battery 141 cooperates with the load 120, the fuel cell device 150, or the hot water storage device 160.

  Although not specifically described in the embodiment, the timing for performing the initial setting of the storage battery device 140, the timing for recovering from the power failure, the timing for turning on the power of the storage battery device 140, the timing for turning on the power of the EMS 200, the setting of the storage battery device 140 It is preferable that the transmission and reception of the code group request and the code group response are performed at the timing when it is necessary to confirm

  Although not particularly mentioned in the embodiment, a message indicating the status of the storage battery 141 is preferably defined between the EMS 200 and the storage battery device 140. The message indicating the operation mode of the storage battery 141 and the message indicating the number of times of charging and discharging of the storage battery 141 are examples of a message indicating the status of the storage battery 141.

  Although not particularly mentioned in the embodiment, it is preferable that a message indicating the specifications of the storage battery 141 is defined between the EMS 200 and the storage battery device 140. The message indicating the output rating of the storage battery 141 is an example of a message indicating the specifications of the storage battery 141.

  Although not particularly mentioned in the embodiment, the storage battery device 140 may autonomously transmit various messages to the EMS 200 instead of the request from the EMS 200. For example, the storage battery device 140 transmits various messages to the EMS 200 when a predetermined condition is satisfied.

  Although not specifically mentioned in the embodiment, the storage battery device 140 transmits a message indicating the specification of the storage battery 141 (for example, a message indicating the output rating of the storage battery 141) and a message indicating the status of the storage battery 141 together with the code group response. You may transmit to EMS200.

  10 consumer, 20 CEMS, 30 substation, 31 distribution line, 40 smart server, 50 power plant, 51 transmission line, 60 network, 100 energy management system, 110 distribution board, 120 load, 130 PV device, 131 PV, 132 PCS, 140 storage battery device, 141 storage battery, 142 PCS, 150 fuel cell device, 151 fuel cell, 151A reformer, 151B cell Stack, 152: PCS, 153: Blower, 154: Desulfurizer, 155: Ignition heater, 156: Control board, 160: Hot water storage device, 170: Hot water supply device, 180, 181, 182 ... Ammeter, 200: EMS, 210 ... Receiving unit, 220: transmitting unit, 230: control unit, 300, 310, 320: user terminal

Claims (6)

A storage battery device provided for the consumer ;
Power control device for transmitting and receiving a message having a predetermined format between the storage battery device ,
The storage battery device operates in one of a plurality of types of operation states including a discharge state in which the power stored in the storage battery device is output to the outside of the storage battery device,
The power control device, as the message, receiving a first message indicating the presence or absence of a function for sending a third message including a driving operation state indicating the type of operating condition of the storage battery device from said battery device,
The power control device transmits a second message requesting the driving operation state to the storage battery device as the message in response to the first message,
The power management system according to claim 1, wherein the power control device receives, as the message, the third message returned in response to the second message from the storage battery device .   The power management system according to claim 1, wherein the predetermined format includes a predetermined field in which the operation state is stored. The power management system according to claim 2, wherein the power control device receives a message in which the operation state is stored in the predetermined field from the storage battery device . A power management method used in a power management system including a storage battery device provided in a consumer and a power control device,
The power control device comprises a step A of transmitting and receiving a message having a predetermined format to and from the storage battery device ,
The storage battery device operates in one of a plurality of types of operation states including a discharge state in which the power stored in the storage battery device is output to the outside of the storage battery device,
The step A includes:
The power control device receiving from the storage battery device a first message indicating the presence or absence of a function of transmitting a third message including an operation state indicating the type of operation state of the storage battery device as the message;
In response to the first message, the power control device transmits a second message requesting the driving operation state to the storage battery device as the message,
The power control device receiving the third message returned in response to the second message as the message from the storage battery device . A power control device,
A transmission / reception unit that transmits and receives a message having a predetermined format to and from a storage battery device provided in a customer ,
The storage battery device is operated in one of a plurality of types of operation states including a discharge state in which power stored in the storage battery device is output to the outside of the storage battery device,
The transmitting and receiving unit, as the message, receiving a first message indicating the presence or absence of a function for sending a third message including a driving operation state indicating the type of operating condition of the storage battery device from said battery device,
The transmitting and receiving unit transmits a second message requesting the driving operation state to the storage battery device as the message in response to the first message,
The power control device, wherein the transmission / reception unit receives, as the message, the third message returned in response to the second message from the storage battery device. A storage battery device provided in a consumer ,
With a transmitting and receiving unit for transmitting a message having a predetermined format between the power control device,
The storage battery device operates in one of a plurality of types of operation states including a discharge state in which the power stored in the storage battery device is output to the outside of the storage battery device,
The transmission / reception unit transmits, to the power control device, a first message indicating whether there is a function of transmitting a third message including an operation state indicating a type of an operation state of the storage battery device , as the message,
The transmitting and receiving unit, as the message transmitted in response to the first message, receives a second message requesting the driving operation state from the power control device,
The storage battery device , wherein the transmission / reception unit transmits the third message to the power control device as the message in response to the second message.

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