JP6971158B2 - Power management equipment and programs - Google Patents

Description

The present invention relates to a power management device and a program.

Under the planned value simultaneous equal amount system, the electric power company submits a power receiving plan for power generation (reverse power flow) and demand (forward power flow) to the general power transmission and distribution company, and the actual value is based on the planned value. It is required to be the same amount at the same time. In this case, if there is an imbalance in which the actual value is excessive or insufficient with respect to the planned value, the general power transmission and distribution business operator will incur costs for making adjustments to the imbalance, and the electric power company and the electric power company will incur costs. Settlement corresponding to imbalance (imbalance settlement) is performed with the general power transmission and distribution company.
Therefore, there is known a power management device that adjusts power so that payment due to imbalance settlement does not occur (see, for example, Patent Document 1).

Further, from the viewpoint of energy saving, it is preferable that the independence rate is promoted. The independence rate is, for example, calculated as the ratio of the power consumed by the consumer by the consumer by using the generated power by the consumer regardless of the purchased power. It is an indicator of effectiveness for use. Therefore, there is known a power management system that seeks an independence rate among consumers and promotes energy saving (see, for example, Patent Document 2).

JP-A-2015-230544 Japanese Unexamined Patent Publication No. 2012-073867

As mentioned above, it can be said that consumers are required to prevent imbalance and to increase the independence rate as much as possible.
However, for example, when the consumer controls the power so that the imbalance does not occur, as an example, there may be a situation in which the power purchased (forward power) should be positively increased in order to suppress the imbalance. It may be difficult to increase the independence rate because of the gain.
On the other hand, when power is controlled so that the independence rate is high for consumers, as an example, the power generated by the power generation device or the power stored in the storage battery should be used in large quantities for power consumption. As a result, imbalance may easily occur.

The present invention has been made in view of such circumstances, and an object of the present invention is to achieve both suppression of imbalance among consumers and increase of independence rate.

One aspect of the present invention for solving the above-mentioned problems is to set the independence rate as a ratio of the power consumption of the consumer to be covered by the generated power obtained in response to the power generation of the power generation device of the consumer to a certain level or more. The self-sustaining rate-corresponding power control unit that executes the self-sustaining rate-corresponding power control that controls the storage battery possessed by the consumer, and the storage battery possessed by the consumer are controlled so that the received power plan of the consumer is achieved. The imbalance-compatible power control unit that executes the imbalance-compatible power control and the power control of the independence rate-compatible power control and the imbalance-compatible power control are executed based on a predetermined determination condition. It is a power management device provided with a power control switching unit for making the power control.

Further, one aspect of the present invention is to set the independence rate of the computer as a ratio of the power consumption of the consumer to be covered by the generated power obtained in response to the power generated by the power generation device of the consumer to a certain level or more. The self-sustaining rate corresponding power control unit that executes the self-sustaining rate corresponding power control that controls the storage battery possessed by the consumer, and the imbalance corresponding that controls the storage battery possessed by the consumer so that the received power plan of the consumer is achieved. An imbalance-compatible power control unit that executes power control, and a power control switching unit that executes either one of the self-sustaining rate-compatible power control and the imbalance-compatible power control based on a predetermined determination condition. It is a program to function as.

As described above, according to the present invention, it is possible to obtain the effect that both the suppression of imbalance in the consumer and the increase of the independence rate can be achieved.

It is a figure which shows the configuration example of the electric power management system in 1st Embodiment. It is a figure which shows the structural example of the electric power management apparatus in 1st Embodiment. It is a flowchart which shows the example of the processing procedure executed by the electric power management apparatus in 1st Embodiment. It is a flowchart which shows the example of the processing procedure executed by the electric power management apparatus in 2nd Embodiment. It is a flowchart which shows the example of the processing procedure executed by the electric power management apparatus in 3rd Embodiment. It is a flowchart which shows the example of the processing procedure executed by the electric power management apparatus in 4th Embodiment.

<First Embodiment>
FIG. 1 shows a configuration example of a power management system included in the consumer facility 100 according to the present embodiment. The power management system shown in the figure includes a power measuring unit 101, a route switching unit 102, a power generation device 103, a storage battery 104, a load 105, and a power management device 200.
Here, the owner of the consumer facility 100 is called a consumer. However, in the following description, the consumer may be described as having the same meaning as the consumer facility 100.

The power measuring unit 101 measures forward power flow power (power purchase power) and reverse power flow power (power sale power). In the present embodiment, the forward power flow means the power to flow forward from the distribution network. Reverse power flow means power that causes reverse power flow to the distribution network. That is, the power measuring unit 101 measures the received power. The received power is the difference between the forward power flow power and the reverse power flow power.
In the consumer facility 100, the electric power supplied from the commercial power supply line DL on the general power transmission and distribution business operator side to the route switching unit 102 via the electric power measuring unit 101 is the forward current electric power. On the other hand, the power output from the power generation device 103 or the storage battery 104 and supplied from the route switching unit 102 to the commercial power supply line DL via the power measurement unit 101 is reverse power flow power.
In the present embodiment, a case where the forward current corresponding to the forward power is in the positive direction is taken as an example. In this case, if the reverse power flow corresponding to the reverse power flow is smaller than the forward power flow corresponding to the forward power flow, the received power is measured as a positive value, and if the reverse power flow power is larger than the forward power flow power, the received power is received. Power is measured as a negative value.

The path switching unit 102 is, for example, a coupling point of a power path between a power measuring unit 101, a power generation device 103, a storage battery 104, and a load 105, and uses power supplied from a commercial power source (forward current power) as the storage battery 104 or a load. It can be distributed and supplied to 105 and the like. Further, the route switching unit 102 can output the electric power output from the power generation device 103 to the commercial power supply line DL via the electric power measuring unit 101 due to reverse power flow.

The power generation device 103 is a facility that receives sunlight to generate power. The power generation device 103 includes a solar cell and a PCS (Power Conditioning System). The power generation device 103 receives sunlight to generate electric power, converts the electric power obtained by the power generation into alternating current by PCS, and outputs the electric power.
The electric power generated by the power generation device 103 can be supplied as a power source for the load 105. Further, the electric power generated by the power generation device 103 can be charged to the storage battery 104. Further, the electric power generated by the power generation device 103 can be reverse-flowed by being output from the route switching unit 102 to the commercial power supply line DL via the electric power measuring unit 101.

The power generation device 103 may be a device that generates power by using natural energy other than solar energy, such as wind power generation and geothermal power generation.

The storage battery 104 is a facility that stores electric power input for charging and discharges and outputs the stored electric power. The storage battery 104 includes, for example, a storage battery and an inverter. The storage battery stores (charges) electric power and outputs (discharges) the stored electric power. The inverter converts the electric power for charging the storage battery from alternating current to direct current, and converts the electric power output from the storage battery by discharging from direct current to alternating current. That is, the inverter performs bidirectional conversion of the electric power input / output by the storage battery 104.

The storage battery 104 can be charged by inputting the electric power of the commercial power supply supplied via the route switching unit 102. Further, the storage battery 104 can be charged by inputting the electric power generated by the power generation device 103.
Further, the storage battery 104 can supply the stored electric power as a power source for the load 105. Further, the storage battery 104 can reverse power flow by outputting the stored electric power from the route switching unit 102 to the commercial power supply line DL via the power measuring unit 101.

The load 105 collectively indicates a predetermined device or equipment that consumes electric power for its own operation in the consumer facility 100.
The load 105 can operate by inputting the commercial power supply supplied from the route switching unit 102. Further, the load 105 can operate by inputting the electric power generated by the power generation device 103. Further, the load 105 can operate by inputting the electric power output from the storage battery 104.

The power management device 200 controls the electric equipment (power generation device 103, storage battery 104, load 105, etc.) in the consumer facility 100.

FIG. 2 shows a configuration example of the power management device 200. The power management device 200 in the figure includes a communication unit 201, a control unit 202, and a storage unit 203.

The communication unit 201 communicates with each device (power generation device 103, storage battery 104, and load 105) in the power management system. Communication with each device by the communication unit 201 may be wireless or wired. Further, the communication unit 201 may be capable of communicating with the outside of the power management system via, for example, a network.

The control unit 202 executes various controls in the power management device 200. The function as the control unit 202 may be realized by executing a program by a CPU (Central Processing Unit) included in the power management device 200.
The control unit 202 includes a power control unit 221 for independence rate, a power control unit 222 for imbalance, a planning unit 223, and a power control switching unit 224.

The independence rate corresponding power control unit 221 executes the independence rate corresponding power control.
The power control corresponding to the self-sustaining rate is a power control that controls the storage battery owned by the consumer so that the self-sustaining rate is set to a certain level or higher.
The independence rate is the ratio of the power consumed by the consumer to the power generated by the consumer (hereinafter, also referred to as "self-consumption").
As a specific example, the independence rate is the ratio of the power generated in the consumer facility 100, not by the purchased power, among the power consumption. In other words, the independence rate is the ratio of the power consumption in the consumer facility 100 that is covered by the power generated by the power generation device 103. The consumption of the power generated by the power generation device 103 in the consumer facility may be such that the load 105 directly inputs the power generation power output from the power generation device 103, or the power generation power once stored in the storage battery 104 is loaded. 105 may be the one to be input.
In such an independence rate (Rsr), the power consumption in the consumer facility 100 is Pcsp, and the power purchased from the general power transmission and distribution business operator at the consumer facility 100 (forward current power, purchased power) is Pb. It is obtained by the following equation 1.
Rsr = 1- (Pb / Pcsp) ... (Equation 1)

For example, when the self-sustaining rate corresponding power control unit 221 is equal to or less than a predetermined constant value, the self-sustaining rate corresponding power control unit 221 increases the generated power of the power generation device 103 or discharges the storage battery 104 accumulating the generated power. It is controlled to increase the independence rate by increasing the ratio of self-consumption to power consumption.
Further, when the calculated independence rate is set to a predetermined constant value or more and the independence rate is higher than necessary, the power control unit 221 corresponding to the independence rate is, for example, the generated power of the power generation device 103. The self-power consumption is reduced by suppressing or suppressing the discharge of the storage battery 104 that stores the generated power, and the self-sustaining rate is controlled to be an appropriate value.

The imbalance-compatible power control unit 222 executes imbalance-compatible power control.
The imbalance-compatible power control is a power control that controls the storage battery 104 owned by the consumer so that the received power plan of the consumer is achieved.

For example, the following control conditions are set in the imbalance-compatible power control unit 222.
Control condition 1: When the value (planned value) of the reverse power flow power in the received power plan is larger than the measured value of the reverse power flow power, the storage battery 104 is charged.
Control condition 2: When the planned value of the reverse power flow power is smaller than the measured value of the reverse power flow power, the storage battery 104 is discharged.
Control condition 3: When the planned value of the forward power flow power is larger than the measured value of the forward power flow power, the storage battery 104 is discharged.
Control condition 4: When the planned value of the forward power flow power is smaller than the measured value of the forward power flow power, the storage battery 104 is charged.
Then, the imbalance-compatible power control unit 222 sets the control according to the control condition in which the absolute value of the difference between the planned value and the measured value is the largest among the above control conditions 1 to 4 as the imbalance-compatible power control. Be made to run.

The planning department 223 formulates a power receiving plan for the consumer facility 100.
In the power management by the power management system in the present embodiment, for example, power control is performed for each unit section divided by a predetermined time in a predetermined control period. In the present embodiment, the case where the control period is one day (24 hours) and the unit interval is 30 minutes will be taken as an example.
The planning unit 223, for example, formulates a supply and demand power plan corresponding to the next control period according to the timing of transition from the previous control period to the next control period. As the received power plan, a plan of the integrated value of the reverse power flow power (reverse power flow power amount) and the integrated value of the forward power flow power (forward power flow power amount) for each unit interval in the control period is formulated.

The planning unit 223 may plan the reverse power flow amount as follows. That is, the planning unit 223 stores the actual power (electric power actual) of the past unit section obtained under the same weather conditions as predicted for each unit interval in the control period to be formulated. Obtained from unit 231. The planning department 223 formulates a plan for the amount of reverse power flow for each unit section to be formulated based on the acquired power record.

In addition, the planning unit 223 may plan the forward current power amount as follows. That is, the planning unit 223 acquires the electric power record for a predetermined control period in the past, and formulates a plan for the forward power flow amount for each unit section to be formulated based on the acquired electric power record. Specifically, the planning unit 223 acquires the actual power for the control period for the most recent predetermined number of days in the past, and in the acquired control period for the predetermined number of days, the forward current power for each unit interval in the same time zone. Calculate the average value of the actual values. The planning unit 223 may use the calculated average value for each unit section as a plan for the amount of forward power flow for each unit section to be formulated.

The power control switching unit 224 causes either one of the power control corresponding to the independence rate and the power control corresponding to the imbalance to be executed based on a predetermined determination condition.
In the present embodiment, the power control switching unit 224 is configured to execute either the independence rate corresponding power control or the imbalance corresponding power control based on the predicted weather.

The storage unit 203 stores various information used by the control unit 202. The storage unit 203 in the figure stores the performance information storage unit 231. The performance information is information on the performance (electric power performance) of the power in the consumer facility 100. The actual information includes information such as received power (forward power flow, reverse power flow power), power consumption, power generation power (power obtained by power generation of the power generation device 103), behavior (charge / discharge operation) history of the storage battery 104, weather, etc. including.
As described above, in the power management by the power management device 200, for example, in the control period of one day (24 hours), the power control is performed for each unit interval divided into, for example, every 30 minutes. The actual information storage unit 231 stores the actual information for each past control period as the actual information. Further, the actual information corresponding to one control period indicates the actual result for each unit interval.

In the power management system of the present embodiment having the above configuration, the power management device 200 can execute the power control corresponding to the self-sustaining rate so that the self-sustaining rate in the consumer facility 100 can be increased as much as possible.
On the other hand, in the power management system of the present embodiment, the power management device 200 formulates the received power plan and then executes the imbalance-compatible power control to achieve the received power according to the formulated power received plan. It is also possible to be done.
There is an advantage that energy saving can be achieved by increasing the independence rate.
In addition, if the power received is planned under the plan value simultaneous equal amount system and imbalance does not occur, payment by imbalance settlement will be suppressed and the cost of power use can be reduced. There are advantages.

However, when the power control corresponding to the self-sustaining rate is performed, a situation may occur in which, for example, the power generated by the power generation device 103 or the power stored in the storage battery 104 is used in large quantities for power consumption. Therefore, imbalance may be likely to occur.
Further, when the imbalance-compatible power control is performed, for example, a situation may occur in which the shortage of power for suppressing the imbalance is supplemented by a commercial power source, so that the independence rate may decrease.
That is, it is difficult to achieve both increasing the independence rate and suppressing the occurrence of imbalance by simultaneously executing the power control corresponding to the independence rate and the power control corresponding to the imbalance.

Therefore, the power management device 200 of the present embodiment determines, for example, for each control period, which power control, the independence rate compatible power control or the imbalance compatible power control, should be executed based on the predicted weather. do. The power management device 200 causes the determined power control to be executed.
With such a configuration, it is considered that the power control corresponding to the independence rate and the power control corresponding to the imbalance are appropriately switched in time division under a certain period including a plurality of control periods. Can be done. That is, in the present embodiment, it is possible to achieve both increasing the independence rate and suppressing imbalance under a certain unit period including a plurality of control periods.

An example of a processing procedure executed by the power management device 200 in the present embodiment will be described with reference to the flowchart of FIG. The process shown in the figure is a process executed corresponding to the start timing of one control period.

Step S101: In the power management device 200, the planning unit 223 acquires various predetermined information (plan formulation usage information) used for formulating the plan at the start of the control period. The planning use information includes, for example, the above-mentioned weather forecast information (weather forecast information), performance information stored by the performance information storage unit 231, and the like. The weather forecast information may be acquired via a network from, for example, a server that provides weather forecast information.

Step S102: The planning unit 223 formulates a received power plan using the plan formulation utilization information acquired in step S101. The formulated power received power plan is submitted to the general power transmission and distribution business operator by a predetermined means, for example, under a contract under the planned value simultaneous equal amount system.

Step S103: The power control switching unit 224 predicts the independence rate of the consumer facility 100. The independence rate predicted here may be, for example, the independence rate when viewed as a whole control period starting from this.
As an example, the power control switching unit 224 can predict the independence rate in the control period of the prediction target as follows. The power control switching unit 224 predicts the power consumption in the control period to be predicted by using the power consumption information in the past performance information stored in the performance information storage unit 231. In the simplest example, the power control switching unit 224 may predict the total amount of power consumption in the control period to be predicted.
Further, the power control switching unit 224 predicts the power purchase power (forward current power) in the control period to be predicted. For this purpose, the power control switching unit 224 predicts the power purchase power included in the past actual information stored in the actual information storage unit 231. In this case, the power control switching unit 224 may predict the total amount of power purchased during the control period to be predicted.
Then, the power control switching unit 224 calculates the independence rate by the above-described equation 1 using the predicted power consumption and the purchased power. In this way, the power control switching unit 224 predicts the independence rate.

Step S104: The power control switching unit 224 determines whether or not the value of the independence rate predicted by step S103 is equal to or less than a predetermined threshold value. The threshold value may be determined, for example, based on the lowest value in the numerical range of the independence rate that can be evaluated as high.

Step S105: When the value of the predicted independence rate is equal to or less than the threshold value, it is difficult to obtain a high independence rate even if the independence rate corresponding power control is performed, and it is better to perform the imbalance corresponding power control. It means that it is advantageous.
Therefore, the power control switching unit 224 in this case causes the imbalance-compatible power control unit 222 to execute the imbalance-compatible power control after the control period is started.
Step S106: The power control switching unit 224 waits for the control period to end under the state in which the imbalance-compatible power control according to step S105 is being executed. When the control period ends, the process shown in the figure ends.

Step S107: When the predicted independence rate value is larger than the threshold value, a high independence rate can be obtained by performing the independence rate corresponding power control. Therefore, the independence rate corresponding power control is prioritized over the imbalance compatible power control. It can be said that it may be allowed to do so.
Therefore, the power control switching unit 224 in this case causes the imbalance-compatible power control by the self-sustaining rate-corresponding power control unit 221 to be executed after the control period is started.
Step S108: The power control switching unit 224 waits for the control period to end under the state in which the power control corresponding to the independence rate according to step S107 is being executed. When the control period ends, the process shown in the figure ends.

In the process shown in the figure, either the self-sustaining rate-corresponding power control or the imbalance-corresponding power control is fixedly executed over one control period. However, for example, in the control period, the independence rate is periodically predicted based on the weather forecast information that is updated sequentially, and based on the predicted independence rate, the independence rate corresponding power control and the imbalance correspondence are made in the control period. Switching may be performed with power control.

<Second Embodiment>
Subsequently, the second embodiment will be described. The power management device 200 of the present embodiment enables power control corresponding to the independence rate to be performed as standard (default) power control during the control period. In addition, the power management device 200 is imbalanced from the power control corresponding to the independence rate up to that point when the difference between the received power shown as the received power plan and the actual value of the current forward power flow becomes a certain value or more. Switch power control to corresponding power control.

That is, in the power management system of the present embodiment, in order to give priority to environmental conservation by energy saving, the power control corresponding to the independence rate is constantly performed. In addition, in the power management system of the present embodiment, the difference between the forward power flow power in the received power plan and the actual value of the current forward power flow power becomes a certain value or more, and the imbalance may exceed the permissible range. If a situation arises, temporarily switch to imbalance-compatible power control.
As described above, in the present embodiment, after giving priority to the power control corresponding to the independence rate, the power control corresponding to the independence rate and the imbalance are switched to the power control corresponding to the imbalance so that the imbalance does not exceed the allowable range. Achieve compatibility with compatible power control.

The flowchart of FIG. 4 shows an example of a processing procedure executed by the power management device 200 of the present embodiment. The process shown in the figure is a process executed so as to loop according to each unit interval during the control period.

Step S201: In the power management device 200, the planning unit 223 acquires planning use information at the start of the next unit interval in the control period.

Step S202: The planning unit 223 formulates a received power plan corresponding to the next unit interval by using the plan formulation utilization information acquired in step S201. The received power plan thus formulated is also submitted to the general power transmission and distribution business operator by a predetermined means, for example, under a contract under the planned value simultaneous equal amount system.

Steps S101 and S102 of FIG. 3 were processes for formulating a received power plan for the next control period. On the other hand, step S201 and step S202 in the figure are processes for formulating the received power plan in the next unit interval in the current control period.

Step S203: The power control switching unit 224 causes the independence rate corresponding power control unit 221 to execute the independence rate corresponding power control according to the timing when the next control period is started.

Step S204: The power control switching unit 224 determines whether or not the current unit interval has been completed under the state in which the power control corresponding to the independence rate is executed in step S203. If it is determined that the current unit interval has ended, the process is returned to step S201.

Step S205: On the other hand, if it is determined in step S204 that the unit interval has not ended, the power control switching unit 224 acquires the actual value of the current received power. The power control switching unit 224 can acquire the actual value of the received power at present by inputting the value of the received power currently measured by the power measuring unit 101.

Step S206: The power control switching unit 224 calculates the difference between the value of the received power indicated by the received power plan formulated in step S202 and the actual value of the received power acquired in step S205.
Step S207: The power control switching unit 224 determines whether or not the difference calculated in step S206 is equal to or greater than a predetermined threshold value. If the difference is less than the threshold, the imbalance is acceptable. In this case, the process is returned to step S203.

Step S208: On the other hand, when the difference calculated by step S206 is equal to or greater than the threshold value, the imbalance is in a state of exceeding the allowable range. Therefore, when the independence rate corresponding power control has been executed so far, the power control switching unit 224 causes the independence rate corresponding power control unit 221 to stop the independence rate corresponding power control, and then imbalance compatible power control. The unit 222 is made to execute the imbalance corresponding power control.

Step S209: The power control switching unit 224 determines whether or not the current unit interval has been completed under the state in which the imbalance-compatible power control is executed in step S208. If it is determined that the current unit interval has ended, the process is returned to step S201.
On the other hand, if it is determined that the current unit interval has not been completed, the process is returned to step S205. After that, if, for example, the difference is less than the threshold value in step S207, the power control is returned from the imbalance-compatible power control up to now to the standard independence rate-compatible power control.

By such processing, power control corresponding to the self-sustaining rate is executed by default during the control period. In addition, if the difference between the received power indicated by the received power plan and the actual value of the received power currently measured exceeds a certain level and exceeds the permissible range, the imbalance-compatible power is temporarily used. The control is switched.

<Third Embodiment>
Subsequently, the third embodiment will be described. In the power management device 200 of the present embodiment, imbalance-compatible power control is performed as standard power control during the control period. Then, the power management device 200 monitors the current independence rate during the control period, and switches the power control from the imbalance-compatible power control up to that point to the independence rate-compatible power control when the independence rate becomes below a certain level. ..

That is, in the power management system of the present embodiment, in order to give priority to cost reduction, imbalance-compatible power control is constantly performed. In addition, the power management system of the present embodiment temporarily switches to power control corresponding to the independence rate when the independence rate becomes below a certain level and the independence rate may fall below the permissible range. Switch. As described above, in the present embodiment, after giving priority to the imbalance-compatible power control, the power control unit corresponding to the independence rate is switched to the power control unit corresponding to the independence rate so that the independence rate does not fall below the allowable range. Achieve compatibility with balanced power control.

The flowchart of FIG. 5 shows an example of a processing procedure executed by the power management device 200 of the present embodiment. Similar to FIG. 4, the process of FIG. 4 is a process executed so as to loop according to each unit interval in the control period.

The processing of steps S301 and S302 in the figure is the same as the processing of steps S301 and S302 in FIG.

Step S303: The power control switching unit 224 causes the independence rate corresponding power control unit 221 to execute the imbalance corresponding power control according to the timing when the next control period is started.

Step S304: The power control switching unit 224 determines whether or not the current unit interval has been completed under the state in which the imbalance-compatible power control is executed in step S303. If it is determined that the current unit interval has ended, the process is returned to step S301.

Step S305: On the other hand, when it is determined in step S304 that the unit interval has not ended, the power control switching unit 224 acquires the current power purchase power and the power consumption by the load 105.

Step S306: The power control switching unit 224 calculates the current independence rate using Equation 1 using the purchased power and the power consumption acquired in step S305.
Step S307: The power control switching unit 224 determines whether or not the independence rate calculated in step S306 is equal to or less than a predetermined threshold value. If the independence rate is greater than the threshold, the current independence rate is within the permissible range. In this case, the process is returned to step S303.

Step S308: On the other hand, when the threshold value calculated by step S306 is equal to or less than the threshold value, the imbalance is in a state of exceeding the allowable range. Therefore, when the imbalance-compatible power control has been executed, the power control switching unit 224 stops the imbalance-compatible power control unit 222 and then causes the independence rate-compatible power control. Unit 221 is made to execute power control corresponding to the independence rate.

Step S309: The power control switching unit 224 determines whether or not the current unit interval has been completed under the state in which the imbalance-compatible power control is executed in step S308. If it is determined that the current unit interval has ended, the process is returned to step S301.
On the other hand, if it is determined that the current unit interval has not been completed, the process is returned to step S305. After that, if, for example, the independence rate becomes larger than the threshold value in step S307, the power control is returned from the conventional independence rate corresponding power control to the standard imbalance corresponding power control.

By such processing, imbalance-compatible power control is executed by default during the control period. In addition, when the current independence rate falls below a certain level and exceeds the permissible range, the power control for independence is temporarily switched to.

<Fourth Embodiment>
Subsequently, the fourth embodiment will be described.
In the second embodiment described above, the power management device 200 is set to perform power control corresponding to the independence rate as standard (default), and then the condition for switching to the power control corresponding to imbalance is satisfied. In some cases, it was set to switch to imbalance-compatible power control. The switching condition for switching to imbalance-compatible power control was that the difference between the received power shown in the received power plan and the actual value of the current forward power flow was above a certain level. That is, in order to suppress the imbalance amount when the deviation (imbalance amount) of the actual value from the planned value becomes a certain value or more, the power control corresponding to the imbalance is temporarily switched to.

However, the electric power cost (electric power charge) fluctuates according to the time zone in one day, a certain long-term period, and the like. The electric power cost here is the cost of the electric power purchased by the consumer facility 100 from the general power transmission and distribution business operator (electric power purchase cost) and the cost of the electric power sold by reverse power flow from the consumer facility 100 (electric power sold). Cost) and included.
In the imbalance-compatible power control, the power management device 200 causes the storage battery 104 to charge or discharge the storage battery 104 so that the received power plan for the consumer is achieved. For example, when performing imbalance-compatible power control that accompanies charging the storage battery 104, the power purchase power cost may be considerably high. In such a case, since there is no particular financial merit for the consumer, it can be considered that there is no need to dare to perform imbalance-compatible power control.
Further, when the imbalance-compatible power control accompanied by the discharge of the storage battery 104 is performed, the power selling power cost may be considerably low. Even in such a case, there is no need to dare to perform imbalance-compatible power control because there is little profit that consumers can obtain by selling power during the execution period of imbalance-compatible power control and there is no particular financial advantage. Can be taken as the idea.

Therefore, in the present embodiment, the power cost is taken into consideration under the configuration in which the power control corresponding to the independence rate is standardized as in the second embodiment and the power control corresponding to the imbalance is switched when the switching condition is satisfied. Therefore, it is decided whether or not to switch to imbalance-compatible power control.

The flowchart of FIG. 6 shows an example of a processing procedure executed by the power management device 200 of the present embodiment.
In the figure, the processing of steps SS401 to S408 is the same as that of steps S201 to S208 of FIG.

Step S409: In the state where the imbalance-compatible power control is being executed by the process of step S407, the power control switching unit 224 acquires the current power cost.
For example, the power cost during the control period is notified in advance by the general power transmission and distribution business operator. The notification indicates, for example, the power cost for each unit interval during the control period. The power management device 200 stores the notified power cost information in the storage unit 203. In step S409, the power control switching unit 224 may acquire the power cost according to the current time zone from the storage unit 203. Further, the electric power cost includes, for example, a power purchase power cost indicating a power unit price according to the power purchase and a power sale power cost indicating a power unit price according to the power sale.

Step S410: Next, the power control switching unit 224 is in a state where the storage battery 104 is charged when the power cost (here, the power purchase power cost) is equal to or higher than a certain level in performing the subsequent imbalance-compatible power control. Judge whether or not. The state to be determined in step S409 is economically disadvantageous to the consumer because the electricity is purchased at a high charge.
Further, in step S410, the power control switching unit 224 determines whether or not the storage battery 104 will be charged under the subsequent imbalance-compatible power control. Regarding whether or not the storage battery 104 will be charged, the power control switching unit 224 determines the control condition 1 among the control conditions 1 to 4 in the above-mentioned imbalance-compatible power control as the subsequent imbalance-compatible power control. It suffices to determine whether or not it corresponds to any of 4.

If it is determined in step S410 that the storage battery 104 is in a state of being charged when the power cost is equal to or higher than a certain level, the process is returned to step S403. As the process shifts to step S403, the power control switching unit 224 switches the power control from the conventional imbalance-compatible power control to the independence rate-compatible power control.

Step S411: When it is determined in step S410 that the storage battery 104 cannot be charged under a power cost of a certain value or more, the power control switching unit 224 further makes the following determination.
That is, the power control switching unit 224 determines whether or not the storage battery 104 is in a state of discharging when the power cost (here, the power selling power cost) is below a certain level when performing the subsequent imbalance-compatible power control. judge. The state to be determined in step S410 has little economic merit for the consumer because the charge paid to the consumer by selling the power is small, and the necessity of executing the imbalance-compatible power control is low.

If it is determined in step S411 that the storage battery 104 is in a state of being discharged while the power cost is below a certain level, the process is returned to step S403. Therefore, also in this case, the power control is switched from the conventional imbalance-compatible power control to the independence rate-compatible power control.

Step S412: When the power control switching unit 224 determines in step S411 that the storage battery 104 is not in a state of discharging when the power cost is below a certain level, the power control switching unit 224 determines the imbalance-compatible power. It is determined whether or not the current unit interval is under the end under the state where the control is executed. If it is determined that the current unit interval has ended, the process is returned to step S401.
On the other hand, if it is determined that the current unit interval has not been completed, the process is returned to step S405.

The above-mentioned power is recorded by recording a program for realizing the function of the above-mentioned power management device 200 on a computer-readable recording medium, reading the program recorded on the recording medium into a computer system, and executing the program. The processing of the management device 200 may be performed. Here, "loading and executing a program recorded on a recording medium into a computer system" includes installing the program in the computer system. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Further, the "computer system" may include a plurality of computer devices connected via a network including a communication line such as the Internet, WAN, LAN, and a dedicated line. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, and a storage device such as a hard disk built in a computer system. As described above, the recording medium in which the program is stored may be a non-transient recording medium such as a CD-ROM. The recording medium also includes an internal or external recording medium accessible from the distribution server for distributing the program. The code of the program stored in the recording medium of the distribution server may be different from the code of the program in a format that can be executed by the terminal device. That is, the format stored in the distribution server does not matter as long as it can be downloaded from the distribution server and installed in a form that can be executed by the terminal device. It should be noted that the configuration in which the program is divided into a plurality of parts and downloaded at different timings and then combined by the terminal device, or the distribution server for distributing each of the divided programs may be different. Furthermore, a "computer-readable recording medium" is a volatile memory (RAM) inside a computer system that serves as a server or client when a program is transmitted via a network, and holds the program for a certain period of time. It shall include things. Further, the above program may be for realizing a part of the above-mentioned functions. Further, a so-called difference file (difference program) may be used, which can realize the above-mentioned function in combination with a program already recorded in the computer system.

100 Consumer facilities, 101 Power measurement unit, 102 Path switching unit, 103 Power generation device, 104 Storage battery, 105 Load, 200 Power management device, 201 Communication unit, 202 Control unit, 203 Storage unit, 221 Independence rate compatible power control unit, 222 Imbalance compatible power control unit, 223 Planning unit, 224 Power control switching unit, 231 Actual information storage unit

Claims (7)

Correspondence to the independence rate that controls the storage battery of the consumer so that the independence rate as the ratio of the power consumption of the consumer to be covered by the generated power obtained by the power generation of the power generation device of the consumer is equal to or higher than a certain level. Independence rate compatible power control unit that executes power control,
An imbalance-compatible power control unit that executes imbalance-compatible power control that controls the storage battery of the consumer so that the power received plan of the consumer is achieved.
A power management device including a power control switching unit that executes either one of the power control corresponding to the independence rate and the power control corresponding to the imbalance based on a predetermined determination condition. The power control switching unit is
The power management device according to claim 1, wherein one of the self-sustaining rate compatible power control and the imbalance compatible power control is executed based on the predicted weather. The power control switching unit is
After executing the power control corresponding to the independence rate as the standard power control, the difference between the forward power flow power in the received power plan and the actual value of the current forward power flow power becomes a predetermined state or more. The power management device according to claim 1, wherein the imbalance-compatible power control is executed. The power control switching unit is
The power management device according to claim 1, wherein the imbalance-compatible power control is executed as a standard power control, and then the independence rate-compatible power control is executed when the independence rate becomes a predetermined value or less. The power control switching unit is
When it is determined in the imbalance-compatible power control that the storage battery operates under a certain power cost or more, the imbalance-compatible power control is not started and the independence rate-compatible power control is performed. The power management device according to claim 3. The power control switching unit is
When it is determined in the imbalance-compatible power control that the storage battery is operated to discharge under a certain power cost or less, the imbalance-compatible power control is not started and the independence rate-compatible power control is performed. The power management device according to claim 3 or 5. Computer,
Correspondence to the independence rate that controls the storage battery of the consumer so that the independence rate as the ratio of the power consumption of the consumer to be covered by the generated power obtained by the power generation of the power generation device of the consumer is equal to or higher than a certain level. Independence rate compatible power control unit that executes power control,
An imbalance-compatible power control unit that executes imbalance-compatible power control that controls a storage battery owned by the consumer so that the power received plan of the consumer is achieved.
A program for functioning as a power control switching unit that executes either one of the power control corresponding to the independence rate and the power control corresponding to the imbalance based on a predetermined determination condition.

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