Power management system, power management device, power management method, and computer program

Abstract

To provide a power management system which controls charging / discharging of a storage battery so that the storage battery of a power consumer can more effectively be used.SOLUTION: A power management system for managing power supplied from at least a power system and a storage battery to a load facility of a power consumer, includes: a plan generation unit for generating a storage battery control plan including schedule information on a charge / discharge state of the storage battery on a prescribed date, which corresponds to a power demand prediction value at the prescribed date after the next day, which is predicted on the basis of the past power demand record of the power consumer, before the prescribed date; and a storage battery control unit for controlling the charge / discharge state of the storage battery on the prescribed date on the basis of the storage battery control plan and a charge residual amount of the storage battery on the prescribed date.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a power management system, a power management device, a power management method, and a computer program, and more particularly to a power management system, a power management device, a power management method, and a computer program for effectively utilizing a storage battery provided in a facility of a power consumer.

Background Art

[0002] In a power supply and demand contract between a power consumer with a power demand above high-voltage power reception and an electric power company, the demand power (so-called demand value) that changes moment by moment is measured as the average power in 30-minute units by a recording type meter, and the contract power is determined based on the maximum demand power, which is the maximum value in a month, etc., and is used as the basis for calculating the basic charge. The contract power is determined by negotiation based on the maximum demand power, etc. over one year when the supply and demand scale is 500 kilowatts or more or in the case of extra-high voltage, and when the supply and demand scale is less than 500 kilowatts, it is the larger value of the maximum demand power of that month and the maximum demand power of the previous 11 months. Therefore, in a power supply and demand contract, it is important to keep the maximum demand value low in order to reduce the electricity bill.

[0003] In recent years, systems for monitoring the power consumption of power consumers in real time and predicting the demand value from the transition situation have been increasingly used (for example, Non-Patent Document 1).

[0004] Furthermore, in order to prevent the demand value from exceeding a predetermined upper limit value (alert threshold value), when the predicted value or estimated value of the demand value exceeds the upper limit value, a warning is issued or other attention is called, and further, control is performed such as prompting or automatically stopping a predetermined load facility (for example, an air conditioner) determined in advance. Techniques for suppressing the increase in the demand value by suppressing power consumption have been proposed (for example, Patent Document 1, Patent Document 2).

[0005] In addition, for power consumers who can use a storage battery (power storage device), when the demand value exceeds a predetermined value by using the power stored in the storage battery, peak cut control is performed to cut the maximum value of the demand value by discharging the power stored in the storage battery, and a method for suppressing an increase in the demand value has been proposed (for example, Patent Document 3).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Non-Patent Documents

[0007]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, when a power consumer uses a storage battery for peak cut of the demand value, in the peak cut control of the demand value disclosed in Patent Document 3, if the actual demand performance exceeds the prediction even after performing the peak cut operation and the storage capacity of the storage battery is exhausted, in order to prevent the storage capacity from falling below the required charge amount (required power amount), the target peak cut level, which is the target upper limit value of the demand value, is increased, and there may be cases where the increase in the demand value is not suppressed.

[0009] Also, as a usage pattern of the storage battery, if discharging is basically performed during the day when power demand relatively increases, there may be a case where the capacity of the storage battery is insufficient at the timing when the demand value exceeds the upper limit value, and peak shaving cannot be performed. On the other hand, in the operation of discharging only when peak shaving is performed, the discharge amount must be suppressed even during the day in preparation for exceeding the upper limit value of the demand value, and there may be an inconvenience that the storage battery is basically in a standby state except during peak shaving and the storage battery cannot be effectively utilized.

[0010] Therefore, an object of the present invention is to provide a power management system, a power management device, a power management method, and a computer program for executing the same that perform charge and discharge control of a storage battery so as to more effectively utilize the storage battery of a power consumer.

Means for Solving the Problem

[0011] The power management system of the present invention for achieving the above object is a power management system that manages power supplied from at least a power grid and a storage battery to a load facility of a power consumer, and includes a plan creation unit that creates a battery control plan including schedule information on the charge and discharge state of the storage battery on a predetermined day after the next day corresponding to a power demand prediction value on the predetermined day predicted based on the past power demand record of the power consumer before the predetermined day, and a battery control unit that controls the charge and discharge state of the storage battery on the predetermined day based on the battery control plan and the remaining charge amount of the storage battery on the day of the predetermined day. , on the day of a predetermined date, the battery control unit acquires the remaining charge amount of the battery, and based on a comparison between the acquired remaining charge amount of the battery and a preset minimum charge amount of the battery, controls the charge / discharge state of the battery to be different from the charge / discharge state according to the battery control plan for the predetermined date, making it possible to control the charge / discharge state of the battery. It is characterized by this.

[0012] The power management device of the present invention is a power management device that manages the power supplied from a power system and a storage battery to the load equipment of a power consumer, and creates a battery control plan including schedule information on the charge / discharge state of the storage battery on a predetermined day after the next day predicted based on the past power demand performance of the power consumer before the predetermined day. A plan creation unit, and a notification unit that notifies the battery control plan to a battery control device that is connected to the power management device via a communication line and controls the storage battery, and causes the battery control device to control the charge / discharge state of the storage battery on the predetermined day based on the battery control plan and the remaining charge amount of the storage battery on the predetermined day itself. , on the day of a predetermined date, cause the battery control device to acquire the remaining charge amount of the battery, and based on a comparison between the acquired remaining charge amount of the battery and a preset minimum charge amount of the battery, make it possible to control the charge / discharge state of the battery to be different from the charge / discharge state according to the battery control plan for the predetermined date. It is characterized by the above.

[0013] The power management method of the present invention is a power management method that manages the power supplied from a power system and a storage battery to the load equipment of a power consumer. By a power management device, a plan creation step of creating a battery control plan including schedule information on the charge / discharge state of the storage battery on a predetermined day after the next day predicted based on the past power demand performance of the power consumer before the predetermined day, and a battery control step of controlling the charge / discharge state of the storage battery on the predetermined day by a battery control device that is connected to the power management device via a communication line and controls the storage battery based on the battery control plan and the remaining charge amount of the storage battery on the predetermined day itself. , in the battery control process, the battery control device acquires the remaining charge amount of the battery on the day of a predetermined date, and based on a comparison between the acquired remaining charge amount of the battery and a preset minimum charge amount of the battery, controls the charge / discharge state of the battery to be different from the charge / discharge state according to the battery control plan for the predetermined date, making it possible to control the charge / discharge state of the battery. It is characterized by the above.

[0014] A computer program for executing the power management method of the present invention causes a computer device for managing power supplied from a power grid and a storage battery to a load facility of a power consumer to create a battery control plan including schedule information on the charge / discharge state of the storage battery on a predetermined day after the next day corresponding to a predicted power demand value on the predetermined day predicted based on the past power demand record of the power consumer before the predetermined day, and notifies the battery control plan to a battery control device connected to the computer device via a communication line and controlling the storage battery via the communication line, and functions as a notification means for causing the battery control device to control the charge / discharge state of the storage battery on the predetermined day based on the battery control plan and the remaining charge amount of the storage battery on the day of the predetermined day. , on the day of a predetermined date, cause the battery control device to acquire the remaining charge amount of the battery, and based on a comparison between the acquired remaining charge amount of the battery and a preset minimum charge amount of the battery, make it possible to control the charge / discharge state of the battery to be different from the charge / discharge state according to the battery control plan for the predetermined date. It is characterized by the above.

Effect of the Invention

[0015] According to the present invention, by creating a battery control plan including a charge / discharge schedule of a storage battery corresponding to a predicted power demand value, and controlling the charge / discharge state of the storage battery on the predetermined day based on the battery control plan and the remaining charge amount of the storage battery on the day of the predetermined day, the storage battery provided as a facility of a power consumer can be effectively utilized.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 11

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, such example embodiments do not limit the technical scope of the present invention.

[0018] [Configuration of Power Management System] FIG. 1 is a diagram showing a configuration example of a power management system according to an embodiment of the present invention. The power supplied from the power grid is measured by the watt-hour meter 10 for its amount of power, and is supplied to a plurality of load facilities (such as air conditioners, elevators, lighting fixtures, computer devices, electrical appliances, etc.) 22 installed in the on-site facilities (houses, offices, factories, etc.) 20 of the power consumer. The terminal device 22a is an operation terminal device for power consumers included in a part of the load facilities 22, such as a general-purpose personal computer, a tablet terminal, a smartphone, etc., and can access the server device 30 via a communication network such as the Internet.

[0019] In the on-site facilities 20, a storage battery 14 is installed, and power can be supplied to the load facilities 22 from both the power grid and the storage battery 14. The battery control device (battery control unit) 16 is connected to the storage battery 14 and communicates with the server device 30 via a communication network, and controls the charge and discharge of the storage battery 14 based on an instruction from the server device 30.

[0020] The server device 30 is a computer device that is communicably connected to at least the terminal device 22a, the power meter 10, and the battery control unit 16 via a communication network. These devices that are connected to each other and communicate constitute the power management system in the embodiment of the present invention. In particular, the power management system of the present invention is configured to include at least the server device 30 and the battery control unit 16, and executes the charge and discharge control function of the battery 14 described later. Further, the server device 30 is the power management device in the present invention.

[0021] Further, the power consumer may be a power utilization form that uses the power generated by the solar power generation facility 18 equipped with solar panels. The power generated by the solar power generation facility 18 can be supplied to the load facility 22 of the power consumer, and can also charge the battery 14.

[0022] [Functions of the Power Management Device] FIG. 2 is a block diagram showing the functions of the server device 30. The server device 30 includes a used power amount acquisition unit 301, an estimated value calculation unit 302, an alert determination processing unit 303, a required power amount prediction unit 304, a solar power generation amount prediction unit 305, a power consumer setting information registration unit 306, a battery control plan creation unit 307, a battery SOC acquisition unit 308, and a notification unit 309. These functions of the server device 30 are realized by the arithmetic processing unit (CPU) of the server device 30 executing a computer program stored in the storage device of the server device 30.

[0023] Further, the storage device of the server device 30 has a power management database (Power Management DB) 310 that stores the measured used power amount. The used power amount acquisition unit 301 acquires the used power amount per minute from the power meter 10. The acquired used power amount per minute is sequentially stored in the storage device of the server device 30 as the power management DB 310.

[0024] As described in the above item of the background art, in the so-called demand contract in the power usage contract of power consumers, the 30-minute demand power amount regarding the power from the power grid is to be measured. With 00 minutes and 30 minutes every hour as the measurement start timings, the power consumption amount for each 30-minute period from that timing until 30 minutes have elapsed is measured. The power meter 10 transmits the power consumption amount per minute to be measured to the server device 30, and the server device 30 accumulates the power consumption amount per minute (hereinafter sometimes referred to as the 1-minute value) received every minute for 30 minutes to obtain the 30-minute demand power amount (hereinafter sometimes referred to as the 30-minute value).

[0025] Figure 3 is a diagram showing information related to the demand power amount (demand value) stored in the power management DB310. The power management DB310 includes, for each identification information (ID) of the power consumer, date and time information including the time every minute, the 1-minute value for each minute, and information on the 30-minute value with 00 minutes and 30 minutes every hour as the measurement start timings.

[0026] The estimated value calculation unit 302 of the server device 30 calculates, for each measurement period from the measurement start timings of 00 minutes and 30 minutes every hour until 30 minutes have elapsed, the estimated value of the integrated power amount of the remaining time from the current time to the end time of the measurement period every minute. The 1-minute value, which is the power consumption amount per minute, is accumulated every minute, and the integrated power amount from the measurement start timing is obtained every minute. The estimated value of the integrated power amount is calculated, for example, based on the actually measured integrated power amount from the measurement start timing to before the time when the calculation is executed, using an approximation method such as a known method like the least squares method, by calculating the change amount (slope) of the increase in the integrated power amount every minute. Estimated values at 1-minute intervals such as the estimated value 1 minute after the current time, the estimated value 2 minutes after, ···, and the estimated value at the end time of the remaining time are obtained, and furthermore, the estimated value is updated and calculated every minute when the latest 1-minute value is acquired.

[0027] FIG. 4 is a diagram for explaining an example of an approximation method for calculating an estimated value. The approximation method for the estimated value is not limited to the least squares method described above, but may be another different approximation method, for example, as shown in FIG. 4, the increase in the integrated power consumption at two times closest to the calculation time is directly used as the change amount of the integrated power consumption and linearly approximated to obtain an estimated value line.

[0028] The alert determination unit 303 of the server device 30 determines whether the estimated value obtained by the estimated value calculation unit 302 exceeds a preset alert threshold (alert determination). If it is determined that the estimated value exceeds the alert threshold (demand alert occurs), the battery control plan described later may be changed.

[0029] The power demand prediction unit 304 of the server device 30 predicts the power consumption of the power consumer on a predetermined day after the next day (usually the next day, and the next day will be described as an example below). The power demand prediction unit 304 acquires the past power demand performance data of the power consumer stored in the power management DB 310, and further data necessary for prediction such as meteorological information such as the predicted temperature and weather of the next day, and uses a known prediction program to obtain predicted values of the power demand (demand values) for 24 hours on the predetermined day in 30-minute units.

[0030] The photovoltaic power generation amount prediction unit 305 obtains a predicted value of the photovoltaic power generation amount for the next day based on meteorological information such as the solar radiation amount (or solar radiation intensity) for the next day provided by a predetermined meteorological information providing service when the power consumer uses the power generated by the photovoltaic power generation facility 18.

[0031] The power consumer setting information registration unit 306 of the server device 30 registers the following power consumer setting information set by the power consumer in the power management DB 310: (1) operation mode, (2) emergency power supply ON / OFF information for BCP (Business Continuity Plan) countermeasures, (3) minimum reserve amount, (4) electricity charge, (5) alert threshold, (6) charging time zone.

[0032] [Creation of Battery Control Plan] The battery control plan creation unit 307 of the server device 30 creates a battery control plan including schedule information on the charge and discharge timing of the battery 14 for the next day based on the predicted value of the power demand for the next day predicted by the power demand prediction unit 304, the predicted value of the photovoltaic power generation amount of the photovoltaic power generation facility 18 for the next day predicted by the photovoltaic power generation amount prediction unit 305, and the power consumer setting information registered in the power management DB 310 by the power consumer setting information registration unit 306. The battery control plan creation unit 307 transmits the created battery control plan to the battery control unit 16. Further, when the above alert determination is made on the day when the battery control plan is executed, the battery control plan creation unit 307 can change the battery control plan on the same day. When the battery control plan is changed, the changed battery control plan is transmitted to the battery control unit 16.

[0033] When executing the battery control plan for the current day, the battery SOC acquisition unit 308 of the server device 30 acquires from the battery control unit 16 the current remaining charge amount of the battery 14 (hereinafter sometimes referred to as "current SOC" (SOC: State of charge)), that is, the current charge rate.

[0034] FIG. 5 is a diagram showing the creation flow of the battery control plan. The battery control plan creation unit 307 creates a battery control plan including schedule information on the charge and discharge state of the battery 14 for a predetermined day corresponding to the predicted value of the power demand for the predetermined day after the next day in a predetermined time period before the predetermined day. The start time of the next day is set as appropriate. For example, when the start time of the next day is set to 4:00 AM, the creation process of the battery control plan is executed in the time period from 1:00 AM to 3:00 AM of the previous day. Further, in the following embodiment example, the battery control plan when a power consumer uses the power generated by the photovoltaic power generation facility 18 will be described. When the photovoltaic power generation facility 18 is not provided, the power generation amount by it is of course not considered in the creation of the battery control plan.

[0035] The battery control plan creation unit 307 acquires the predicted demand power values (demand prediction values) for every 30 minutes of the 24 hours of the next day from the demand power amount prediction unit 304 (S100). Note that the predicted demand power values are the predicted values of the total power amount used in the in-house facility 20, including the solar power generation amount and the charge / discharge amount of the battery, in addition to the power amount used in the power grid.

[0036] In addition, when the power consumer uses the power generated by the solar power generation facility 18, the battery control plan creation unit 307 acquires the predicted solar power generation amount for the next day from the solar power generation amount prediction unit 305 (S101).

[0037] Furthermore, the battery control plan creation unit 307 acquires the following power consumer setting information set by the power consumer (S102). The power consumer setting information is set in advance in the server device 30 by the power consumer operating the terminal device 22a and is registered in the power management DB 310.

[0038] (1) Operation mode · Electricity charge reduction mode: A mode in which the charge / discharge timing of the battery is controlled to prioritize the reduction of the electricity charge amount (charging in time zones with a high electricity charge unit price is prohibited) · Demand control mode: A mode in which the charge / discharge timing of the battery is controlled to prioritize the peak cut of the demand value (charging in time zones with a high electricity charge unit price is permitted) Select one of the above operation modes.

[0039] When creating the battery control plan, the above-mentioned multiple operation modes are prepared so as to be able to respond to various needs of power consumers.

[0040] (2) Emergency power supply ON / OFF information for BCP (Business Continuity Plan) countermeasures Select whether to use (ON) or not use (OFF) the battery as an emergency power supply for BCP countermeasures. If it is used, the minimum reserve amount to be left in the battery at a minimum is set in the following (3).

[0041] (3) Minimum reserve amount In the above (2), when setting the emergency power supply for BCP countermeasures to ON, the value of the minimum reserve amount of the charge amount to be reserved in the storage battery is set in the range of 0 to 100%. When setting the emergency power supply for BCP countermeasures to OFF, the minimum reserve amount is automatically set to 0%.

[0042] When the storage battery is the emergency power supply for BCP countermeasures, it is necessary to ensure a predetermined minimum reserve amount and reflect it in the creation of the storage battery control plan. With this setting, while using the storage battery 14 as the emergency power supply for BCP countermeasures, it can also be used for daily charge and discharge such as peak shaving operation, and the effective utilization of the storage battery 14 can be achieved.

[0043] (4) Electricity tariff plan · General plan: A tariff system with a fixed unit price where the electricity quantity tariff unit price does not vary by time zone. Note that in summer, the tariff unit price is different from that in other seasons · Seasonal plan: A tariff system where the electricity tariff unit price varies by time zone (usually, the tariff unit price is relatively low in the night time zone and relatively high in the daytime time zone). The tariff unit price also differs between summer and other seasons Select one of the electricity tariff menus that the electricity consumer has contracted. Also, set the tariff unit price by season and time zone.

[0044] By controlling the charge and discharge timing of the storage battery so that it charges during the time zone with a relatively low tariff unit price and discharges during the time zone with a relatively high tariff unit price, the electricity tariff for charging can be reduced and the peak of the demand value due to discharge can be cut. Therefore, the electricity tariff plan is used in the creation of the storage battery control plan. By controlling the charge and discharge timing of the storage battery 14 according to the electricity tariff plan, it is possible to reduce the electricity tariff while effectively utilizing the storage battery 14.

[0045] (5) Alert threshold An alert threshold is set for performing an alert determination on the estimated value of the integrated power consumption calculated every 30 minutes as described above. Preferably, the alert determination may be performed in two stages. At every minute of each time period, when the alert threshold is exceeded for the first time and when the alert threshold is exceeded for the second time, control for changing the charge / discharge state of the storage battery 14 is set.

[0046] (6) Charging time period A time period for charging the storage battery 14 during a day is set, such as a time period when the power consumption of the power consumer is relatively low or a time period when the unit price of the contract electricity tariff of the power consumer is relatively low.

[0047] Based on the acquired predicted value of the power demand (demand prediction value), the predicted value of the photovoltaic power generation amount, and the power consumer setting information, the battery control plan creation unit 307 creates a battery control plan including the charge / discharge schedule (any one of "charge", "discharge", "standby") of the storage battery for each time period of the next day (S103). The notification unit 309 notifies the battery control unit 16 of the created battery control plan before the next day starts (S104).

[0048] FIG. 6 is a flowchart of the creation process of the charge / discharge schedule (any one of "charge", "discharge", "standby") of the storage battery in the creation of the battery control plan in S103 of FIG. 5. For each time period, according to the following flow, a plan for the charge / discharge schedule (setting any one of "charge", "discharge", "standby" for each time period) of the storage battery in each time period is created.

[0049] First, it is determined whether the time period to be planned is within the charging time zone (S1031). The charging time zone is determined based on the information of the (6) charging time zone in the power consumer setting information. If the time period is within the charging time zone, then next, the time period is planned as "charging" (S1035). If it is not within the charging time zone, it is determined whether the predicted value of the solar power generation amount for the time period exceeds the predicted value of the required power (whether the required power can be covered only by the solar power generation amount) (S1032). If it exceeds, since it is predicted that the solar power generation amount will be surplus, the time period is planned as "charging" in order to use the surplus for charging the storage battery 14 (S1035). If it does not exceed, then further, the operation mode is determined (S1033). The operation mode is determined based on the information of the (1) operation mode in the power consumer setting information. Note that if the solar power generation facility 18 is not provided, the determination process of S1032 is not performed. As a process to proceed to the determination process of step S1033 after the determination process of step S1031, it is also possible.

[0050] If the operation mode is the "demand control mode", the time period is planned as "discharge" in order to effectively utilize the power stored in the storage battery (S1036). If the operation mode is the "electricity charge reduction mode", when it is the time zone with the lowest electricity charge unit price (S1034), since the electricity charge unit price is the same as that of the charging time zone of the storage battery, the time period is planned as "standby" without discharging (S1037). If it is not such a time zone (S1034), the time period is planned as "discharge" (S1038). By the above determination process, the charge and discharge schedule of the storage battery for each time period is planned.

[0051] FIG. 7 is a diagram showing an example of the content of the storage battery control plan notified to the storage battery control unit 16. The storage battery control plan includes the charge and discharge schedule of the storage battery 14 for each unit time (each time period) every 30 minutes for 24 hours of the next day created by the process of FIG. 6, and further includes the minimum SOC (State Of Charge) for each time period and the information of ON / OFF of the charge prohibition flag for each time period.

[0052] The minimum SOC for each time period is the amount of charge to be left in each previous time period so that the battery 14 is discharged during the time period planned as "discharge" with respect to the charge and discharge schedule of the battery 14 for each time period created by the process of FIG. 6. Specifically, the battery control plan creation unit 307 calculates, by calculation, the amount of charge to be left in each time period so that the difference between the amount of charge and the amount of discharge due to the passage of the remaining time periods after that time period does not become negative for each time period for which the plan is to be created.

[0053] FIG. 8 is a diagram schematically explaining an example of setting the minimum SOC. FIG. 8 is an example of determining the minimum SOC for the time period T1 for which the plan is to be created. For example, as shown in FIG. 8(a), when it is assumed that the SOC (charge rate) of the battery 14 at time period T0 is 0%, if "charge" is planned at the subsequent time period T1 and "discharge" is planned at the subsequent time periods T2, T3, and T4, it is possible to discharge at time period T2, but the charge becomes 0% after time period T3 and discharging becomes impossible. In this case, as shown in FIG. 8(b), by setting the minimum SOC at time period T0 to 40% and ensuring a charge amount of 40% or more at time period T0, it is possible to discharge at least until time period T4.

[0054] In the normal case of charging at night and continuing to discharge during the day, the minimum SOC for the time periods before that is determined so that discharging is possible until the last time period of the next day for which discharging is planned. For example, when charging is planned due to the excess of the solar power generation amount during the day, the minimum SOC at the start time of the next day may be set relatively low in consideration of the amount of charge.

[0055] Further, the battery control plan creation unit 307 obtains the minimum SOC to be left in each previous time period so that the battery 14 is discharged at the time period (time zone in which the required power amount is predicted to be relatively high) when a demand alert may occur from the predicted value of the required power amount for the next day (so as to leave the amount of charge required for discharging at that time period). In this way, the minimum amount of charge to be left in each time period so that charge depletion does not occur at the time period for which discharging is planned is set as the minimum SOC.

[0056] When the storage battery 14 is set as an emergency power source for BCP countermeasures, the minimum SOC is set to a value greater than the value of the minimum reserve. The minimum SOC for each time period is obtained by the storage battery control plan creation unit 307 as part of the storage battery control plan together with the charge / discharge schedule of the storage battery 14, and is notified to the storage battery control unit 16.

[0057] The charge prohibition flag for each time period is a flag that prohibits the charging operation of the storage battery 14. When the charge prohibition flag is set to ON, the charging operation of the storage battery 14 is prohibited. For example, in the daytime time zone (the time zone with a relatively high electricity price unit) when the operation mode is the "electricity price reduction mode" and the price menu is the "seasonal time menu", the charge prohibition flag is set to ON. The ON / OFF information of the charge prohibition flag for each time period is determined by the storage battery control plan creation unit 307 as part of the storage battery control plan together with the charge / discharge schedule of the storage battery 14, and is notified to the storage battery control unit 16.

[0058] As described above, the storage battery control plan for a predetermined day created before the predetermined date may be changed on the day of the predetermined day. This is the case when a power demand different from the storage battery control plan for the predetermined day created by the previous day occurs, and the actual demand power amount on the day of the predetermined day is different from and exceeds the predicted demand power amount (demand prediction value), and an unexpected alert determination occurs. In this case, the storage battery control plan creation unit 307 reviews and changes the storage battery control plan for that time period.

[0059] FIG. 9 is a diagram showing a change processing flow of the storage battery control plan in the storage battery control plan creation unit 307. When the storage battery control plan creation unit 307 receives the occurrence of a demand alert on the day of the predetermined day (S200), it rewrites and changes the charge / discharge schedule of the storage battery 14 in the storage battery control plan for the predetermined day created the previous day for the time period when the demand alert is received (S201).

[0060] FIG. 10 is an example of a change table for the battery control plan. In the example of FIG. 10, at the target time period, the charge / discharge state of the battery 14 is changed and set when the estimated value reaches the alert threshold value at the first stage (the first time) and when the estimated value reaches the alert threshold value at the second stage (the second time). Specifically, at the first time, if the current charge / discharge state is charging, it is set to the standby state, and if it is in the standby state, it is changed to the discharge state. Also, at the second stage, if the current charge / discharge state is in the standby state, it is changed to the discharge state. Regarding the rewriting of the minimum SOC, in both the first time and the second stage, when the emergency power supply setting for BCP countermeasures is OFF, it is set to 0%. Thereby, using the remaining charge of the current SOC, discharge becomes possible regardless of the value of the substantially minimum SOC. When the emergency power supply setting for BCP countermeasures is ON, it is set to the value of the minimum reserve (if it is the same as the initial setting, that setting is maintained).

[0061] When the battery control plan creation unit 307 changes the original battery control plan at the time period when the demand alert occurs, the notification unit 309 notifies the changed battery control plan to the battery control unit 16 (S202).

[0062] [Battery Control] FIG. 11 is a diagram showing the processing flow of the battery control unit 16. When the battery control unit 16 receives the battery control plan for a predetermined day from the battery control plan creation unit 307 by the day before the predetermined day, it controls the charge / discharge state of the battery on the day of the predetermined day based on the battery control plan and the remaining charge of the battery (current SOC) on the day of the predetermined day. When the day of the predetermined day (for example, 0:00 am on the day of the predetermined day) starts, the battery control unit 16 performs processing based on the battery control plan at the reception timing of the battery control plan (including both the daily regular battery control plan notified before the start of the predetermined day and the battery control plan changed on the day of the predetermined day), the start timing of each time period in 30 - minute units (hh:00:00 / hh:30:00), and the timing of each 1 - minute elapse timing.

[0063] When the battery control unit 16 receives a battery control plan (S300), it acquires the current remaining charge amount (current SOC) of the battery 14 (S301), and compares the minimum SOC at the time when the battery control plan was received with the acquired current SOC (S302). If the current SOC is not lower than the minimum SOC, the battery control unit 16 instructs the battery 14 to be in a charge / discharge state (any one of "charge", "discharge", "standby") according to the received battery control plan (S303). By sequentially checking so that the current SOC does not fall below the minimum SOC, even if a discharge that deviates from the battery control plan occurs temporarily due to a demand alert or the like on the day of a predetermined date, then, it is possible to quickly return to the original battery control plan so that the current SOC does not fall below the minimum SOC.

[0064] If the current SOC is lower than the minimum SOC, it determines whether to set a charge prohibition flag for the target time period (S304). If the charge prohibition flag is not set to OFF, the battery control unit 16 instructs "standby" regardless of the charge / discharge state planned by the battery control plan (S305). It controls by instructing the battery 14 to be in a charge / discharge state different from the charge / discharge state according to the battery control plan. Since it is set to the electricity charge reduction mode and it is a time period when the electricity charge unit price is high, even if the current SOC is lower than the minimum SOC, charging is prohibited.

[0065] If the charge prohibition flag is set to OFF, the battery control unit 16 instructs the battery 14 to "charge" (S306). Since the current SOC is lower than the minimum SOC, the battery 14 is charged. Also in this case, it controls by instructing the battery 14 to be in a charge / discharge state different from the charge / discharge state according to the battery control plan.

[0066] Also, the battery control unit 16 performs the same control at each time limit start timing (hh:00:00 / hh:30:00) in units of 30 minutes (S310). That is, the battery control unit 16 acquires the current SOC of the battery 14 (S311), and compares the minimum SOC in the target time limit with the acquired current SOC (S312). If the current SOC is not lower than the minimum SOC, the battery control unit 16 instructs the battery 14 to be in the charge / discharge state ("charge", "discharge", or "standby") according to the received battery control plan (S313).

[0067] If the current SOC is lower than the minimum SOC, it is determined whether the charge prohibition flag is set for the target time limit (S314). If the charge prohibition flag is not set to OFF, the battery control unit 16 instructs "standby" regardless of the charge / discharge state planned by the battery control plan (S315).

[0068] If the charge prohibition flag is set to OFF, the battery control unit 16 instructs the battery 14 to "charge" (S316).

[0069] Furthermore, the battery control unit 16 acquires the current SOC of the battery 14 every time one minute elapses during each time limit (S320) (S321), and determines whether the battery 14 is currently discharging and the current SOC in the target time limit is lower than the minimum SOC (S322). If it is discharging and the current SOC is lower than the minimum SOC, the battery control unit 16 Discharge is stopped, and the battery 14 is instructed to "standby" (S323). Otherwise, the current charge / discharge state is maintained.

[0070] In the above-described embodiment example, a battery control plan including a charge / discharge schedule of a storage battery corresponding to a predicted value of the required power amount is created, and the charge / discharge state of the storage battery on the day of a predetermined day is finely controlled based on the battery control plan created before the predetermined day and the actual remaining charge amount on the predetermined day, so that the storage battery can be effectively utilized. For example, charging is performed during a time period when the electricity price per unit is relatively low, and during a time period when the electricity price per unit is relatively high, while discharging the storage battery to suppress an increase in the required power amount (demand value), and maintaining a remaining charge amount that allows discharging even when an alert is generated due to an increase in the required power amount, so that peak shaving can be prepared for.

[0071] Furthermore, by performing more fine-grained charge / discharge control of the storage battery according to various electricity price plans in which the electricity price per unit varies depending on the power usage status and time period of the power consumer, etc., it is possible to reduce the electricity bill of the power consumer.

[0072] Also, even when the storage battery is used as an emergency power source corresponding to BCP, it is possible to maximize the effective utilization of the charge amount stored in the storage battery while maintaining the minimum reserve amount. Furthermore, the charge / discharge state of the storage battery can be effectively controlled according to the generated power amount (or predicted generated power amount) of a power generation facility using renewable energy such as a solar power generation facility.

[0073] As described above, in the embodiment of the present invention, as an example, a server device (power management device) 30 on a network creates a battery control plan including schedule information on the charge / discharge state of the storage battery in 30-minute units per day based on the predicted demand value of the power consumer for the next day. The created battery control plan is notified to a battery control unit (battery control device) 16, and the battery control unit 16 performs charge / discharge control of the storage battery based on the received battery control plan and the current SOC of the storage battery.

[0074] In the above-described embodiment example, instead of the solar power generation facility 18, other power generation facilities using renewable energy, such as a wind power generation facility or a biomass power generation facility, may be used.

[0075] The present invention is not limited to the above-described embodiments, and of course, even if there are design changes within the scope that do not deviate from the gist including various modifications and corrections that can be conceived by those having ordinary knowledge in the field of the present invention, they are included in the present invention.

Explanation of Signs

[0076] 10: Watt-hour meter, 14: Storage battery, 16: Storage battery control unit (storage battery control device), 18: Solar power generation facility, 20: In-house facility, 22: Load facility, 22a: Terminal device, 30: Server device (power management device)

Claims

1. A power management system for managing power supplied from at least a power grid and a storage battery to a load facility of a power consumer, comprising: a plan creation unit that creates, before a predetermined date, a battery control plan including schedule information on a charge / discharge state of the storage battery on a predetermined date after the next day corresponding to a predicted power demand value on the predetermined date predicted based on past power demand records of the power consumer; a battery control unit that controls the charge / discharge state of the storage battery on the predetermined date based on the battery control plan and the remaining charge of the storage battery on the predetermined date; The battery control unit is characterized in that, on the predetermined date, it acquires the remaining charge of the storage battery and can control the charge / discharge state of the storage battery to be different from the charge / discharge state according to the battery control plan on the predetermined date based on a comparison between the acquired remaining charge of the storage battery and a preset minimum charge of the storage battery. A power management system.

2. A power management system for managing power supplied from at least a power grid and a storage battery to a load facility of a power consumer, comprising: a plan creation unit that creates, before a predetermined date, a battery control plan including schedule information on a charge / discharge state of the storage battery on a predetermined date after the next day corresponding to a predicted power demand value on the predetermined date predicted based on past power demand records of the power consumer; a battery control unit that controls the charge / discharge state of the storage battery on the predetermined date based on the battery control plan and the remaining charge of the storage battery on the predetermined date; The power management system is characterized in that the schedule information includes information on a first time period for charging the storage battery, a second time period for discharging the storage battery, and a third time period for setting the storage battery in a standby state where neither charging nor discharging is performed on the predetermined date.

3. The power management system according to Claim 1, wherein the schedule information includes information on a first time period for charging the storage battery, a second time period for discharging the storage battery, and a third time period for setting the storage battery in a standby state where neither charging nor discharging is performed on the predetermined date.

4. The power management system according to Claim 2 or 3, wherein when the remaining charge of the storage battery falls below the minimum charge of the storage battery during the second time period on the predetermined date, the battery control unit stops discharging the storage battery and controls it to enter a standby state.

5. The power management system according to any one of claims 1 to 4, wherein the planning unit creates, as the battery control plan, information on the minimum charge amount to be left in the battery for each unit time on a predetermined date.

6. The planning unit acquires the power consumption amount for each unit time on the day of the predetermined date, and when an estimated value of the power consumption amount at the elapse of a predetermined time obtained based on the time change of the power consumption amount exceeds a predetermined alert threshold value, changes the battery control plan created before the predetermined date. The power management system according to any one of claims 1 to 5, wherein the battery control unit controls the charge / discharge state of the battery on the day of the predetermined date based on the changed battery control plan and the remaining charge amount of the battery on the day of the predetermined date.

7. When power generated by renewable energy is supplied to the load equipment of the power consumer in addition to the power grid and the battery. The power management system according to any one of claims 1 to 6, wherein the planning unit further creates the battery control plan using the power demand prediction value and the predicted power generation amount by renewable energy on a predetermined date.

8. The power generation by renewable energy is solar power generation. The power management system according to claim 7, wherein the planning unit obtains a predicted power generation amount by the solar power generation based on the solar radiation amount on the predetermined date included in the acquired weather information.

9. A power management method for managing power supplied from a power grid and a battery to load equipment of a power consumer, comprising: A planning step of creating, by a power management device, a battery control plan including schedule information on the charge / discharge state of the battery on a predetermined date corresponding to a power demand prediction value for a predetermined date after the next day predicted based on the past power demand record of the power consumer before the predetermined date; A battery control step of controlling the charge / discharge state of the battery on the day of the predetermined date based on the battery control plan and the remaining charge amount of the battery on the day of the predetermined date by a battery control device connected to the power management device via a communication line. In the battery control process, the battery control device acquires the remaining charge of the battery on the predetermined day, and based on the comparison between the acquired remaining charge of the battery and the preset minimum charge of the battery, the charge and discharge state of the battery can be controlled to be different from the charge and discharge state according to the battery control plan for the predetermined day. A power management method characterized by this.

10. A power management device that manages the power supplied from a power system and a battery to a load device of a power consumer, A plan creation unit that creates a battery control plan including schedule information of the charge and discharge state of the battery on a predetermined day after the next day corresponding to the predicted power demand value on the predetermined day based on the past power demand record of the power consumer before the predetermined day, A notification unit that notifies the battery control plan to a battery control device that is connected to the power management device via a communication line and controls the battery via the communication line, and causes the battery control device to control the charge and discharge state of the battery on the predetermined day based on the battery control plan and the remaining charge of the battery on the predetermined day, The battery control device is caused to acquire the remaining charge of the battery on the predetermined day, and based on the comparison between the acquired remaining charge of the battery and the preset minimum charge of the battery, A power management device characterized in that the charge and discharge state of the battery can be controlled to be different from the charge and discharge state according to the battery control plan for the predetermined day.

11. A computer device for managing the power supplied from a power system and a battery to a load device of a power consumer, A plan creation means for creating a battery control plan including schedule information of the charge and discharge state of the battery on a predetermined day after the next day corresponding to the predicted power demand value on the predetermined day based on the past power demand record of the power consumer before the predetermined day, Function as a notification means for notifying the battery control plan to a battery control device that is connected to the computer device via a communication line and controls the battery via the communication line, and causing the battery control device to control the charge and discharge state of the battery on the predetermined day based on the battery control plan and the remaining charge of the battery on the predetermined day, A computer program, characterized in that the battery control device is caused to acquire the remaining charge amount of the battery on a predetermined day, and based on a comparison between the acquired remaining charge amount of the battery and a preset minimum charge amount of the battery, the charge and discharge state of the battery is controlled to be different from the charge and discharge state according to the battery control plan on the predetermined day. **Claim 12**: A power management method for managing power supplied from a power system and a battery to a load facility of a power consumer, comprising: A plan creation step of creating, by a power management device, a battery control plan including schedule information of the charge and discharge state of the battery on a predetermined day after the next day predicted based on the past power demand record of the power consumer, before the predetermined day; A battery control step of controlling the charge and discharge state of the battery on the predetermined day based on the battery control plan and the remaining charge amount of the battery on the predetermined day by a battery control device connected to the power management device via a communication line and controlling the battery; The schedule information includes information on a first time period for charging the battery, a second time period for discharging the battery, and a third time period for setting the battery in a standby state where neither charging nor discharging is performed, on the predetermined day. A power management method characterized by this. **Claim 13**: A power management device for managing power supplied from a power system and a battery to a load facility of a power consumer, comprising: A plan creation unit that creates, before a predetermined day, a battery control plan including schedule information of the charge and discharge state of the battery on the predetermined day after the next day predicted based on the past power demand record of the power consumer; A notification unit that notifies the battery control plan via the communication line to a battery control device connected to the power management device via the communication line and controls the battery, and causes the battery control device to control the charge and discharge state of the battery on the predetermined day based on the battery control plan and the remaining charge amount of the battery on the predetermined day; The schedule information includes information on a first time period for charging the battery, a second time period for discharging the battery, and a third time period for setting the battery in a standby state where neither charging nor discharging is performed, on the predetermined day. A power management device characterized by this. **Claim 14**: A computer device for managing power supplied from a power system and a battery to a load facility of a power consumer Planning means for creating, before a predetermined date, a battery control plan including schedule information on the charge / discharge state of the battery on the predetermined date corresponding to a predicted value of power demand on a predetermined date after the next day predicted based on the past power demand record of the power consumer; Notify the battery control plan via the communication line to a battery control device that is connected to the computer device via the communication line and controls the battery, and based on the battery control plan and the remaining charge of the battery on the predetermined date, cause the battery control device to Function as a notification means for controlling the charge / discharge state of the battery on the predetermined date; The schedule information includes information on a first time period for charging the battery, a second time period for discharging the battery, and a third time period for setting the battery in a standby state where neither charging nor discharging is performed, on the predetermined date. A computer program characterized by this.

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