Charge / discharge plan creation device and charge / discharge plan creation method

Abstract

To create a charge and discharge plan of a power storage battery, of which a power selling price becomes the maximum, and a profit by a power selling becomes the maximum.SOLUTION: A charge and discharge plan creation device contains: a first calculation part that calculates a first power selling price in a creation object day of a charging and discharging plan on the basis of a charging plan created by a charging plan part and a discharging plan created by a discharging plan part; and a second calculation part that updates the discharging plan by removing a discharging amount of a discharging frame until a prediction value of a power price is reached from a cheep to a discharge amount in accordance with a charging amount to be removed in each update of the change of the charging plan by removing the charging amount of one charging frame from the side where the prediction value of the power price is high, and calculates a second power selling price in each creation object day of the charging and discharging plan on the basis of the charging plan and the discharging plan that are updated; and a charging and discharging plan creation part that creates the charging and discharging plan on the basis of the charging plan and the discharging plan that become the highest power selling price from the first and second power selling prices.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a charge-discharge plan creation device and a charge-discharge plan creation method for creating a charge-discharge plan for a storage battery.

Background Art

[0002] In recent years, a Feed-in-Premium (FIP) system has been introduced regarding the sale of electricity by power generation businesses that utilize renewable energy (such as solar power, wind power, hydraulic power, etc.). Along with the introduction of the FIP system, the above-mentioned power generation businesses combine power generation facilities that generate electricity using renewable energy with storage batteries, and charge the storage batteries with the generated electricity during time periods such as daytime when the electricity price is relatively low, and discharge the electricity stored in the storage batteries during time periods such as nighttime when the electricity price is relatively high, performing a so-called time shift to obtain revenue from the sale of electricity. (See Patent Document 1)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When charging the storage battery to its full capacity, a charge amount A of "capacity of the storage battery / charge efficiency α" is required. On the other hand, even when attempting to discharge the storage battery to its full capacity, only a discharge amount B of "capacity of the storage battery × discharge efficiency β" can be discharged. That is, between the charge amount A and the discharge amount B, the relationship of "discharge amount B < charge amount A" and "discharge amount B = α × β × charge amount A" holds.

[0005] In order to create a daily charge-discharge plan for a battery, if multiple charging slots are allocated during the daytime when electricity prices are low and multiple discharging slots are allocated during the nighttime when electricity prices are high, unless the relationship (average discharging price / average charging price) > (1 / (α × β)) holds between the average electricity price across the multiple charging slots (average charging price), the average electricity price across the multiple discharging slots (average discharging price), and the charging efficiency α and discharging efficiency β, then even if the electricity stored in the battery is sold on a time-shift basis, no profit will be made. Therefore, even if a relatively large-capacity battery is used, it may be difficult to maximize this profit.

[0006] The present invention has been made in view of the above problems, and one of its objectives is to provide a charge / discharge plan creation device and a charge / discharge plan creation method that can create a charge / discharge plan for a storage battery that maximizes the electricity selling price and the revenue from selling electricity, regardless of the capacity of the storage battery. [Means for solving the problem]

[0007] One of the present inventions for achieving the above objectives is a charge and discharge plan creation device for a storage battery that charges the generated power of a power generation facility that generates electricity using renewable energy and discharges the charged power, comprising: a charge planning unit that creates a charge plan in which, in a charging time period including a plurality of charging frames in which the predicted value of the electricity price on the day for which the charge and discharge plan is to be created is less than or equal to a first price, the charging unit charges the storage battery until it reaches its capacity in the order of the charging frames in which the predicted value of the electricity price moves from the lowest price to the highest price; and in a discharge time period including a plurality of discharge frames in which the predicted value of the electricity price is greater than or equal to a second price which is greater than or equal to the first price, the unit charges the storage battery until it reaches its capacity in the order of the discharge frames in which the predicted value of the electricity price moves from the highest price to the lowest price. The system includes: a discharge planning unit that creates a discharge plan for performing discharge; a first calculation unit that calculates a first electricity selling price on the day the charge-discharge plan is to be created based on the charge plan and the discharge plan; a second calculation unit that updates the charge plan by deleting the charge amount of one of the charge slots from the higher side of the predicted electricity price, and updates the discharge plan by deleting the discharge amount of the discharge slots from the lower side of the predicted electricity price until it reaches a discharge amount corresponding to the deleted charge amount, and calculates a second electricity selling price on the day the charge-discharge plan is to be created based on the updated charge plan and the discharge plan; and a charge-discharge plan creation unit that creates the charge-discharge plan based on the charge plan and the discharge plan which have the highest electricity selling price among the first and second electricity selling prices.

[0008] Furthermore, another aspect of the present invention for achieving the above objectives is a charge and discharge plan creation device for a storage battery that charges the generated power of a power generation facility that generates electricity using renewable energy and discharges the charged power, comprising: a charge planning unit that creates a charge plan in which, in a charging time period including a plurality of charging frames in which the predicted value of the electricity price on the day for which the charge and discharge plan is to be created is less than or equal to a first price, the charging unit charges the storage battery until it reaches its capacity in the order of the charging frames in which the predicted value of the electricity price moves from a low price to a high price; and in a discharge time period including a plurality of discharge frames in which the predicted value of the electricity price is greater than or equal to a second price that is greater than or equal to the first price, the unit charges the storage battery until it reaches its capacity in the order of the discharge frames in which the predicted value of the electricity price moves from a high price to a low price. The system includes: a discharge planning unit that creates a discharge plan to discharge up to a certain point; a first calculation unit that calculates a first electricity selling price on the day the charge-discharge plan is to be created based on the charge plan and the discharge plan; a second calculation unit that updates the charge plan by deleting the discharge amount of one of the discharge frames from the lower end of the predicted electricity price and updating the charge plan by deleting the charge amount of the charge frames from the higher end of the predicted electricity price until it reaches a charge amount corresponding to the deleted discharge amount, and calculates a second electricity selling price on the day the charge-discharge plan is to be created based on the updated charge plan and the discharge plan; and a charge-discharge plan creation unit that creates the charge-discharge plan based on the charge plan and the discharge plan which have the highest electricity selling price among the first and second electricity selling prices.

[0009] Furthermore, another aspect of the present invention for achieving the above objectives is a charge and discharge plan creation device for a storage battery that charges the generated power of a power generation facility that generates electricity using renewable energy and discharges the charged power, comprising: a charge planning unit that creates a charge plan in which, in a charging time period including a plurality of charging frames in which the predicted value of the electricity price on the target day for creating the charge and discharge plan is less than or equal to a first price, the charging frame is arranged in the order from the lowest price to the highest price of the predicted electricity price, and charges are performed until the storage battery reaches its capacity; a discharge planning unit that creates a discharge plan in which, in a discharge time period including a plurality of discharge frames in which the predicted value of the electricity price is greater than or equal to a second price greater than or equal to the first price, the discharge frame is arranged in the order from the highest price to the lowest price of the predicted electricity price, and discharges are performed until the storage battery reaches its capacity; a first calculation unit that calculates a first electricity selling price on the target day for creating the charge and discharge plan based on the charge plan and the discharge plan; and the higher side of the predicted value of the electricity price Each time the charge amount of one of the charge units is deleted from the charge unit and the charge plan is updated, the second calculation unit updates the discharge plan by deleting the discharge amount of the discharge unit from the lower end of the predicted electricity price until it reaches the discharge amount corresponding to the deleted charge amount, and calculates a second electricity selling price on the day the charge / discharge plan is created based on the updated charge plan and the discharge plan. Each time the discharge plan is updated by deleting the discharge amount of one of the discharge units from the lower end of the predicted electricity price, the third calculation unit updates the charge plan by deleting the charge amount of the charge unit from the higher end of the predicted electricity price until it reaches the charge amount corresponding to the deleted discharge amount, and calculates a third electricity selling price on the day the charge / discharge plan is created based on the updated charge plan and the discharge plan.

[0010] According to the charge / discharge plan creation device of the present invention, it is possible to create a charge / discharge plan for a storage battery that maximizes the electricity selling price and thus maximizes profits.

[0011] Furthermore, another aspect of the present invention for achieving the above objectives is a charge / discharge planning device in which the discharge time period is a time period after the charge time period.

[0012] The charge-discharge plan created by the charge-discharge plan creation device of the present invention is a plan in which, on the day for which the charge-discharge plan of the storage battery is created, the storage battery is charged all at once during the daytime when the predicted value of electricity prices is relatively low, and the storage battery is discharged all at once during the nighttime when the predicted value of electricity prices is relatively high. As a result, the storage battery does not have to repeat the charge-discharge operation frequently, and it is possible to prevent the premature decline in charge efficiency and discharge efficiency.

[0013] Furthermore, the problems disclosed in this application and their solutions will be made clear from the description in the section on embodiments for carrying out the invention and from the drawings. [Effects of the Invention]

[0014] According to the present invention, it is possible to create a battery charging and discharging plan that maximizes the electricity selling price and thus the profit. [Brief explanation of the drawing]

[0015] [Figure 1] This is a block diagram showing the schematic configuration of a power generation system 1, including a charge / discharge planning device 100. [Figure 2] This graph shows an example of the relationship between the predicted electricity price by the electricity price forecasting device 160, the predicted power output by the power generation forecasting device 170, the planned charge amount of the battery 120 in the charging unit, and the planned discharge amount of the battery 120 in the discharging unit. [Figure 3] This block diagram shows the main functions of the charge / discharge planning device 100. [Figure 4A] This is a diagram of table data showing an example of the relationship between the predicted power output of the PV power generation facility 110 and the predicted electricity price, which are stored in memory area 1072. [Figure 4B] This figure shows an example of initial charge / discharge plan values ​​stored in memory area 1075. [Figure 4C] This is a diagram showing an example of the first charge / discharge plan update value stored in the memory area 1078. [Figure 4D] This is a diagram showing an example of the second charge / discharge plan update value stored in the memory area 1078. [Figure 4E] This is a diagram showing an example of the third charge / discharge plan update value stored in the memory area 1078. [Figure 4F] This is a diagram showing an example of the fourth charge / discharge plan update value stored in the memory area 1078. [Figure 4G] This is a diagram showing an example of the fifth charge / discharge plan update value stored in the memory area 1078. [Figure 5] This is a block diagram showing an example of the hardware of the information processing device 10 that realizes the functions of the charge / discharge plan creation device 100. [Figure 6A] This is a flowchart showing an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan in the first embodiment. [Figure 6B] This is a flowchart showing an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan, and shows the process following the process of FIG. 6A. [Figure 7A] This is a diagram showing an example of the first charge / discharge plan update value stored in the memory area 1078. [Figure 7B] This is a diagram showing an example of the second charge / discharge plan update value stored in the memory area 1078. [Figure 7C] This is a diagram showing an example of the third charge / discharge plan update value stored in the memory area 1078. [Figure 8A] This is a flowchart showing an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan in the second embodiment. [Figure 8B] This is a flowchart showing an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan, and shows the process following the process of FIG. 8A. [[ID=--40]] [Figure 9] This is another block diagram showing the main functions of the charge / discharge plan creation device 100. [Figure 10A]This flowchart shows an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan in the third embodiment. [Figure 10B] This flowchart shows an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan, and is a process that follows the process shown in Figure 10A. [Figure 10C] This flowchart shows an example of the process when the charge / discharge plan creation device 100 creates a charge / discharge plan, and is a flowchart of the process following the process shown in Figure 10B. [Modes for carrying out the invention]

[0016] The following matters will become clear from this specification and the accompanying drawings. The present invention will be described below with reference to the accompanying drawings, with reference to one embodiment thereof.

[0017] Figure 1 is a block diagram showing the schematic configuration of a power generation system 1 including a charge / discharge planning device 100 according to this embodiment. In this embodiment, the power generation equipment that generates electricity using renewable energy is, for example, a photovoltaic power generation equipment (hereinafter referred to as "PV power generation equipment" (PV: Photo Voltaic)) 110 that generates electricity using sunlight.

[0018] The power generation system 1 comprises a charge / discharge planning device 100, PV power generation equipment 110, a storage battery 120, a storage battery control device 130, a weather information provision device 150, an electricity price forecasting device 160, and a power generation forecasting device 170.

[0019] The charge / discharge planning device 100, PV power generation equipment 110, storage battery 120, storage battery control device 130, weather information provision device 150, electricity price forecasting device 160, and power generation forecasting device 170 are connected in a manner that enables communication via a communication network 180. The communication network 180 can be, for example, a LAN (Local Area Network), WAN (Wide Area Network), dedicated line, power line communication network, or various public communication networks. In addition to the communication network 180, the PV power generation equipment 110 and storage battery 120 are also connected to a power grid 190 operated by a general power transmission and distribution company, etc.

[0020] The PV power generation equipment 110 includes a photovoltaic power generation panel composed of, for example, polycrystalline silicon power generation elements, monocrystalline silicon power generation elements, thin-film power generation elements, etc. The PV power generation equipment 110 also includes a power conditioner (PCS: Power Conditioning Subsystem) 110A that converts the power generated by the photovoltaic power generation panel from DC to AC and supplies it to the power grid 190. The power generated by the PV power generation equipment 110 is either supplied to the power grid 190 via the power conditioner 110A (sold to a general transmission and distribution company) or supplied to the storage battery 120 (charged by the storage battery 120). In this embodiment, the power generated by the PV power generation equipment 110 is supplied to the storage battery 120 during 10 charging frames C1 to C10 included in the charging time period.

[0021] The battery 120 is, for example, a lead-acid battery, a lithium-ion battery, a sodium-sulfur battery, a nickel-metal hydride battery, a redox flow battery, a fuel cell, a capacitor battery, etc. The battery 120 is equipped with a power conditioner (PCS) 120A for charging and discharging in and out of the power grid 190.

[0022] The weather information provider 150 provides the electricity price forecasting device 160 and the power generation forecasting device 170 with weather information (e.g., temperature, solar radiation, etc.) for the area where the PV power generation equipment 110 is installed on the day on which the charge / discharge plan for the storage battery 120 is created (the day on which the charge / discharge plan is created). The weather information provider 150 may obtain the above weather information from a weather observation station in the area where the PV power generation equipment 110 is installed, or it may obtain the above weather information from a weather information server managed by the Japan Meteorological Agency.

[0023] The electricity price prediction device 160 predicts the electricity price (yen / kW) of the electricity traded on the day for which the charge / discharge plan for the battery 120 is created (the day for which the charge / discharge plan is created), by referring to weather information obtained from the weather information provider 150, as well as information such as the date, time, and day of the week. In this embodiment, the electricity price prediction device 160 predicts the electricity price for each time frame, for example, with a 30-minute time frame as one frame. Furthermore, as a method for predicting the electricity price, the electricity price prediction device 160 can use, for example, a well-known technique that predicts the electricity price by combining the above-mentioned weather information, date, time, and day of the week with analytical techniques such as artificial intelligence. In addition, the electricity price prediction device 160 may obtain predicted electricity prices published by a third party via the communication network 180 or the internet.

[0024] The power generation forecasting device 170 predicts the power output (MWh) for each cycle of the PV power generation equipment 110 based on weather information obtained from the weather information provider 150, location information of the PV power generation equipment 110 (latitude, longitude, etc.), and information such as the installation area and installation angle of the solar power generation panels, for the day on which the charge and discharge plan for the storage battery 120 is created (the day for which the charge and discharge plan is created). As a method for the power generation forecasting device 170 to predict the power output of the PV power generation equipment 110, well-known techniques such as a physical model that combines the above-mentioned weather information, location information of the PV power generation equipment 110, and installation area and installation angle of the solar power generation panels with analytical techniques that predict power output at a pinpoint level, or a statistical model that combines analytical techniques such as artificial intelligence that has learned the relationship between past weather information and actual power output values, can be used.

[0025] The charge / discharge planning device 100 obtains predicted electricity prices from the electricity price forecasting device 160 and predicted power output of the PV power generation equipment 110 from the power generation power forecasting device 170 for the day on which the charge / discharge plan for the storage battery 120 is created (the day on which the charge / discharge plan is to be created). Based on the predicted electricity prices and power output, the device adjusts the amount of charge in the 10 charging frames C1 to C10, which are included in the charging time period when the predicted electricity prices are relatively low, and the amount of discharge in the 7 discharge frames D1 to D7, which are included in the discharging time period when the predicted electricity prices are relatively high. The device then creates a charge / discharge plan according to the amount of charge in each charging frame C1 to C10 and the amount of discharge in each discharge frame D1 to D7 when the selling price (sales revenue) of the storage battery 120 is at its highest. Details of the charge / discharge planning device 100 will be described later.

[0026] The battery control device 130 acquires the charge and discharge plan created by the charge and discharge plan creation device 100, and controls the charge and discharge operation of the battery 120 so that the battery 120 charges according to the charge amount for each charge frame C1 to C10 planned in the charge and discharge plan, and the battery 120 discharges according to the discharge amount for each discharge frame D1 to D7 planned in the charge and discharge plan.

[0027] Figure 2 is a graph showing an example of the relationship between the predicted electricity price by the electricity price forecasting device 160, the predicted power output by the power generation forecasting device 170, the planned charge amount of the battery 120 in charging frames C1 to C10, and the planned discharge amount of the battery 120 in discharging frames D1 to D7, on the day for which the charge / discharge plan of the battery 120 is to be created.

[0028] In Figure 2, the horizontal axis scale represents time in 30-minute units (1 unit) per day, the left vertical axis scale represents the power output of the PV power generation facility 110 in 0.5 MWh units, and the right vertical axis scale represents the electricity price in 5 yen / kW units in the market where electricity is bought and sold. Also in Figure 2, the dashed line shows the predicted value of the electricity price on the day for which the charge / discharge plan for the battery 120 is created, the double dashed line shows the predicted value of the power output of the PV power generation facility 110 on the day for which the charge / discharge plan for the battery 120 is created, the black line extending vertically shows the planned value of the charge amount of the battery 120 in charging units C1 to C10 included in the charging time period, and the white line extending vertically shows the planned value of the discharge amount of the battery 120 in discharge units D1 to D7 included in the discharge time period. In this embodiment, the charging time period is from 9:30 to 14:00 when the predicted electricity price is, for example, 19.85 yen (first price) / kW or less, and the discharging time period is from 16:00 to 19:00 when the predicted electricity price is, for example, 23.02 yen (second price) / kW or more. The charging time period includes 10 charging frames C1 to C10 by dividing the period from 9:30 to 14:00 into 30-minute units, and the discharging time period includes 7 discharging frames D1 to D7 by dividing the period from 16:00 to 19:00 into 30-minute units.

[0029] Here, when the battery 120 is charged with the power generated by the PV power generation equipment 110, the planned value of the charge amount per unit is equal to the capacity of the power conditioner 110A / 2 when the predicted value of the power output per unit of the PV power generation equipment 110 is 2 or more than the capacity of the power conditioner 110A, and on the other hand, when the predicted value of the power output per unit of the PV power generation equipment 110 is less than the capacity of the power conditioner 110A, it is equal to the predicted value of the power output per unit of the PV power generation equipment 110. Note that the capacity of the power conditioner 110A / 2 is the capacity that the power conditioner 110A can handle for one unit of the power output of the PV power generation equipment 110. In this embodiment, the predicted value of the power output of the PV power generation equipment 110 during the charging period is set to be 2 or more than the capacity of the power conditioner 110A. In other words, the maximum planned charge amount of the battery 120 in charging stations C1 to C10 is limited to the capacity of the power conditioner 110A / 2 (2.5 MWh). Also, the predicted electricity price during the charging period increases in the order of charging stations C6, C7, C8, C1, C5, C4, C3, C2, C9, and C10. Conversely, the predicted electricity price during the discharge period decreases in the order of discharge stations D3, D4, D2, D5, D1, D6, and D7.

[0030] In Figure 2, the charging and discharging schedule for battery 120 is created, with the discharging period set after the charging period. However, if the predicted electricity price rises to 23.02 yen or higher during the charging period, or falls to 19.85 yen or lower during the discharging period, a discharging period may be inserted within the charging period, or a charging period may be inserted within the discharging period. Also, in Figure 2, different predicted electricity prices (19.85 yen / kW) are selected for setting the charging period and different predicted electricity prices (23.02 yen / kW) are selected for setting the discharging period, but this is not limited to these values. For example, one predicted electricity price could be selected to separate the charging period and the discharging period, with the period when the electricity price is below this predicted price set as the charging period and the period when the electricity price is above this predicted price set as the discharging period.

[0031] <First Embodiment> Figure 3 is a block diagram showing the main functions of the charge / discharge plan creation device 100 according to the first embodiment.

[0032] The charge / discharge plan creation device 100 is comprised of an input unit 1010, a charge planning unit 1020, a discharge planning unit 1030, a first calculation unit 1040, a second calculation unit 1050, a charge / discharge plan creation unit 1060, a storage unit 1070, and an output unit 1080.

[0033] When the charge / discharge plan creation device 100 is determined to create a charge / discharge plan for the battery 120, the input unit 1010 obtains a predicted value for the electricity price on the day for which the charge / discharge plan for the battery 120 is to be created from the electricity price forecasting device 160, and also obtains a predicted value for the power output of the PV power generation equipment 110 on the day for which the charge / discharge plan for the battery 120 is to be created from the power generation forecasting device 170.

[0034] The charging planning unit 1020 creates a charging plan for 10 charging time slots C1 to C10, which fall within the charging time slot from 9:30 to 14:00, where the predicted electricity price obtained from the electricity price forecasting device 160 is 19.85 yen / kW or less. The plan is to charge the battery 120 in order from the lowest to the highest predicted electricity price during the charging time slot (C6, C7, C8, C1, C5, C4, C3, C2, C9, C10), until the cumulative amount of charge to be charged to the battery 120 reaches the capacity of the battery 120. During the charging time slot, the predicted power output of the PV power generation equipment 110 is 2 or more of the capacity of the power conditioner 110A, so the planned maximum value of the charge amount in the battery 120 is limited to 2 of the capacity of the power conditioner 110A. The planned values ​​for the charge amounts of charge segments C1 to C10 included in the charge plan initially created by the charge planning unit 1020 are referred to as the initial charge plan values.

[0035] The discharge planning unit 1030 creates a discharge plan for discharge frames D1 to D7 included in the discharge time period from 16:00 to 19:00, where the predicted electricity price obtained from the electricity price forecasting device 160 is, for example, 23.02 yen / kW or more. The plan discharges the battery 120 in order from the highest to the lowest predicted electricity price during the discharge time period (D3, D4, D2, D5, D1, D6, D7) until the cumulative amount of discharged battery 120 reaches the capacity of battery 120. Note that during the discharge time period, the planned maximum value of the discharge amount in battery 120 is limited to the capacity of power conditioner 110A / 2. The planned values ​​of the discharge amounts for discharge frames D1 to D7 included in the discharge plan initially created by the discharge planning unit 1030 are called the initial discharge plan values. The charge / discharge plan creation unit 1060 creates the initial charge / discharge plan values ​​by combining the above initial charge plan values ​​and initial discharge plan values.

[0036] The first calculation unit 1040 calculates the first electricity selling price (also referred to as the first electricity selling revenue) for the battery 120 using the predicted value of the power output of the PV power generation equipment 110, the initial charge plan value which is the planned amount of charge for the battery 120 initially planned during the charging period, and the initial discharge plan value which is the planned amount of discharge for the battery 120 initially planned during the discharging period, for all 48 time slots of the day for which the charge and discharge plans for the battery 120 are to be created.

[0037] The second calculation unit 1050 calculates the second electricity selling price (also referred to as the second electricity selling revenue) by performing the following process to confirm whether the first electricity selling price calculated by the first calculation unit 1040 is the highest electricity selling price on the day for which the charge / discharge plan for the storage battery 120 is created. Specifically, each time the second calculation unit 1050 updates the charge plan for the storage battery 120 by deleting the charge amount of one charging time slot from among the charging time slots C1 to C10 in the charging period, starting from the one with the highest predicted electricity price, it updates the discharge plan for the storage battery 120 by deleting the discharge amount of discharge time slots D1 to D7 in the discharge period, starting from the one with the lowest predicted electricity price, until it reaches the discharge amount corresponding to the deleted charge amount. The updated planned charge amounts for charging time slots C1 to C10 are referred to as the updated charge plan values, and the updated planned discharge amounts for discharge time slots D1 to D7 are referred to as the updated discharge plan values. Then, the second calculation unit 1050 calculates the second electricity selling price for the battery 120 for all 48 time slots of the day for which the charge and discharge plan for the battery 120 is to be created, using the predicted value of the power output of the PV power generation equipment 110, the updated charge plan value which is the planned amount of charge of the battery 120 updated during the charging time slot, and the updated discharge plan value which is the planned amount of discharge of the battery 120 updated during the discharging time slot.

[0038] Furthermore, the process by which the second calculation unit 1050 calculates the second electricity selling price is repeated until it is determined that either the first electricity selling price or the second electricity selling price is the highest value on the day for which the charge / discharge plan for the storage battery 120 is created.

[0039] The charge / discharge plan creation unit 1060 creates initial charge / discharge plan values ​​based on the initial charge plan values ​​planned by the charge plan unit 1020 and the initial discharge plan values ​​planned by the discharge plan unit 1030. The charge / discharge plan creation unit 1060 also creates updated charge / discharge plan values ​​based on the updated charge plan values ​​and updated discharge plan values ​​updated by the second calculation unit 1050. The charge / discharge plan creation unit 1060 compares the first electricity selling price and the second electricity selling price. If the first electricity selling price is the highest value, it creates a charge / discharge plan based on the initial charge / discharge plan values. If the second electricity selling price is the highest value, it creates a charge / discharge plan based on the updated charge / discharge plan values.

[0040] The memory unit 1070 has 10 memory areas. Memory area 1071 stores the control program for operating the charge / discharge plan creation device 100. Memory area 1073 stores the initial charge plan values ​​planned by the charge plan unit 1020. Memory area 1074 stores the initial discharge plan values ​​planned by the discharge plan unit 1030. Memory area 1075 stores the initial charge / discharge plan values ​​and the first electricity selling price created by the charge / discharge plan creation unit 1060. Memory area 1076 stores the updated charge plan values ​​updated by the second calculation unit 1050. Memory area 1077 stores the updated discharge plan values ​​updated by the second calculation unit 1050. Memory area 1078 stores the updated charge / discharge plan values ​​and the second electricity selling price created by the charge / discharge plan creation unit 1060. Furthermore, the memory area 1072 stores, for each day targeted for creating the charge / discharge plan for the storage battery 120, the predicted electricity price obtained from the electricity price prediction unit 160 and the predicted power output obtained from the power generation prediction unit 170, each associated with a total of 48 frames.

[0041] Figure 4A is a diagram of table data showing an example of the relationship between the predicted power output of the PV power generation facility 110 and the predicted electricity price, which are stored in memory area 1072. The time on the day for which the charge / discharge plan for the battery 120 is created is divided into 48 30-minute intervals, and each interval is associated with the predicted power output (MWh) of the PV power generation facility 110 and the predicted electricity price (yen / kW). In the example in Figure 4A, it is predicted that the PV power generation facility 110 will generate power from the 6:30 interval to the 16:30 interval, and within this interval, the time from the 9:30 interval to the 14:00 interval, when the predicted electricity price is 19.85 yen / kW or less, is set as the charging time. Also, the time from the 16:00 interval to the 19:00 interval, when the predicted electricity price is 23.02 yen / kW or more, is set as the discharge time.

[0042] Figure 4B shows an example of initial charge / discharge plan values ​​stored in memory area 1075. The initial charge / discharge plan values ​​in Figure 4B are stored in memory area 1075 in a manner that associates all 48 timeframes for the day on which the charge / discharge plan for the battery 120 is created with charging timeframes C1 to C10, discharging timeframes D1 to D7, the initial charge plan value (MWh) planned by the charging planning unit 1020, the initial discharge plan value (MWh) planned by the discharging planning unit 1030, and the electricity selling price (in ten thousand yen).

[0043] Figure 4C shows an example of the first charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 4C are stored in memory area 1078 in an associated manner for all 48 time slots on the day for which the charge / discharge plan of the battery 120 is created. This includes charging time slots C1 to C10, discharging time slots D1 to D7, and the charge plan update value (MWh) obtained by deleting the planned charge amount for charging time slot C10, where the predicted electricity price is highest (19.85 yen / kW) during the charging time period, as well as the discharge plan update value (MWh) obtained by deleting the discharge amount corresponding to the charge amount deleted in charging time slot C10, starting from discharging time slot D7, where the predicted electricity price is lowest during the discharging time period.

[0044] Figure 4D shows an example of the second charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 4D are stored in memory area 1078 in an associated manner with all 48 time slots for the day on which the charge / discharge plan for the battery 120 is created. These include the charge plan update values ​​(MWh) obtained by further deleting the planned charge amount for charge time slot C9, where the predicted electricity price during the charging period is the second highest value (17.04 yen / kW), and the discharge plan update values ​​(MWh) obtained by deleting the discharge amount corresponding to the charge amount deleted in charge time slot C9, from discharge time slot D7, where the predicted electricity price during the discharging period is the lowest value, and discharge time slot D6, where the second lowest value is the second lowest value (23.03 yen / kW).

[0045] Figure 4E shows an example of the third charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 4E are stored in memory area 1078 in an associated manner with all 48 time slots for the day on which the charge / discharge plan for the battery 120 is created. These include the charge plan update values ​​(MWh) obtained by further deleting the planned charge amount for charge slot C2, where the predicted electricity price during the charging period is the third highest value (17 yen / kW), and the discharge plan update values ​​(MWh) obtained by deleting the discharge amount corresponding to the charge amount deleted in charge slot C2, from the discharge slot D6, where the predicted electricity price during the discharging period is the second lowest value (23.03 yen / kW).

[0046] Figure 4F shows an example of the fourth charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 4F are stored in memory area 1078 in an associated manner with all 48 time slots for the day on which the charge / discharge plan for the battery 120 is created. These include the charge plan update values ​​(MWh) obtained by further deleting the planned charge amount for charge slot C3, where the predicted electricity price during the charging period is the fourth highest value (16.81 yen / kW), and the discharge plan update values ​​(MWh) obtained by deleting the discharge amount corresponding to the charge amount deleted in charge slot C3, from discharge slot D6, where the predicted electricity price during the discharging period is the second lowest value (23.03 yen / kW), and discharge slot D1, where the predicted electricity price is the third lowest value (23.04 yen / kW).

[0047] Figure 4G shows an example of the fifth charge / discharge plan update value stored in memory area 1078. The charge / discharge plan update value in Figure 4G is stored in memory area 1078 in an associated manner with all 48 time slots for the day on which the charge / discharge plan for the battery 120 is created. This includes the charge plan update value (MWh) obtained by further deleting the planned charge amount for charge slot C4, where the predicted electricity price during the charging period is the fifth highest value from the highest (16.12 yen / kW), and the discharge plan update value (MWh) obtained by deleting the discharge amount corresponding to the charge amount deleted in charge slot C4, from discharge slot D1, where the predicted electricity price during the discharging period is the third lowest value from the lowest, and discharge slot D5, where the predicted electricity price is the fourth lowest value from the lowest (24.58 yen / kW).

[0048] The output unit 1080 outputs a charge / discharge plan created by the charge / discharge plan creation unit 1060 that maximizes the amount of electricity sold. This charge / discharge plan information is input to the battery control device 130 via the communication network 180.

[0049] Figure 5 is a block diagram showing an example of the hardware of an information processing device 10 that realizes the functions of the charge / discharge planning device 100 shown in Figure 3. The information processing device 10 comprises a processor 11, main memory 12, auxiliary memory 13, input device 14, output device 15, and communication device 16. The information processing device 10 is, for example, a personal computer, office computer, various server devices, a general-purpose machine, etc. The information processing device 10 may be implemented in whole or in part using virtual information processing resources provided using virtualization technology, such as a virtual server provided by a cloud system. The charge / discharge planning device 100 may be implemented using multiple information processing devices 10 that are connected to each other in a communicative manner.

[0050] The processor 11 is composed of, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), an AI (Artificial Intelligence) chip, and the like.

[0051] The main memory 12 is a device for storing programs and data, and is, for example, ROM (Read Only Memory), RAM (Random Access Memory), or non-volatile memory (NVRAM (Non-Volatile RAM)).

[0052] The auxiliary storage device 13 is, for example, an SSD (Solid State Drive), a hard disk drive, an optical storage device (CD (Compact Disc), DVD (Digital Versatile Disc), etc.), a storage system, an IC card, an SD card, a reader / writer for optical recording media, or the storage area of ​​a cloud server. Programs and data can be read into the auxiliary storage device 13 via a recording media reader or a communication device 16. Programs and data stored in the auxiliary storage device 13 are read into the main memory 12 as needed.

[0053] The input device 14 is an interface that accepts input from an external source, and can be, for example, a keyboard, mouse, touch panel, card reader, pen-input tablet, or voice input device.

[0054] The output device 15 is an interface that outputs various information such as processing progress and processing results. The output device 15 may be, for example, a display device that visualizes the above information (LCD (Liquid Crystal Display), graphics card, etc.), a device that converts the above information into sound (speaker, etc.), or a device that converts the above information into text (printer, etc.). The information processing device 10 may also be configured to input and output information to and from other devices via the communication device 16.

[0055] The input device 14 and the output device 15 constitute a user interface for receiving and presenting information with the user.

[0056] The communication device 16 is a device that enables communication (wired or wireless communication) with other devices via a communication infrastructure such as the communication network 5, and is configured using, for example, a NIC (Network Interface Card), a wireless communication module, a USB module, etc.

[0057] Furthermore, the information processing device 10 may have, for example, an operating system, a file system, a DBMS (Database Management System) (relational database, NoSQL, etc.), a KVS (Key-Value Store), etc. installed on it.

[0058] The functions of the charge / discharge planning device 100 are realized either by the processor 11 of the information processing device 10 reading and executing a control program stored in the main memory 12, or by the functions of the hardware (FPGA, ASIC, AI chip, etc.) that constitutes the charge / discharge planning device 100 itself. For example, the input unit 1010 is realized by the input device 14, the output unit 1080 is realized by the output device 15, the charge planning unit 1020, the discharge planning unit 1030, the first calculation unit 1040, the second calculation unit 1050, and the charge / discharge planning unit 1060 are realized by the processor 11, and the storage unit 1070 is realized by the main memory 12 and the auxiliary storage device 13.

[0059] Figures 6A and 6B are flowcharts illustrating an example of the process by which the charge / discharge plan creation device 100 creates a charge / discharge plan for the battery 120 on the designated day for creating the charge / discharge plan.

[0060] The following describes an example of the processing operation of the charge / discharge plan creation device 100, with reference to Figures 2, 3, and 4A to 4G.

[0061] For the sake of explanation, on the day for which the charge / discharge plan for the battery 120 is created, the State of Charge (SOC) of the battery 120, which indicates the charge state of the battery 120 before the charging period and after the discharging period, will be assumed to be 0%. In other words, the charge / discharge plan creation device 100 creates a charge / discharge plan in which the battery 120 is charged from 0% to 100% during the charging period, and discharged from 100% to 0% during the discharging period. In this embodiment, based on the predicted electricity price and the predicted power generation of the PV power generation equipment 110, a power price of 19.85 yen / kW is selected to set the charging period in order to ensure a sufficient time window for charging the battery 120 from 0% to 100%, and a power price of 23.02 yen / kW is selected to set the discharging period in order to ensure a sufficient time window for discharging the battery 120 from 100% to 0%.

[0062] Furthermore, in the following explanation, n is an integer that starts at 1 and increases by 1 each time. The cheapest charging time slot in the charging period with the lowest predicted electricity price (n=1) is C6, the second cheapest (n=2) is C7, the third cheapest (n=3) is C8, the fourth cheapest (n=4) is C1, the fifth cheapest (n=5) is C5, the sixth cheapest (n=6) is C4, the seventh cheapest (n=7) is C3, the eighth cheapest (n=8) is C2, the ninth cheapest (n=9) is C9, and the tenth cheapest (n=10) charging time slot with the highest predicted electricity price is C10.

[0063] Furthermore, in the following explanation, m is an integer that starts at 1 and increases by 1 each time. The discharge frame with the highest predicted electricity price in the first (m=1) discharge period is D3, the discharge frame with the second highest (m=2) predicted electricity price is D4, the discharge frame with the third highest (m=3) predicted electricity price is D2, the discharge frame with the fourth highest (m=4) predicted electricity price is D5, the discharge frame with the fifth highest (m=5) predicted electricity price is D1, the discharge frame with the sixth highest (m=6) predicted electricity price is D6, and the discharge frame with the seventh highest (m=7) predicted electricity price and the lowest price in the discharge period is D7.

[0064] Furthermore, the charging efficiency α when charging the battery 120 is assumed to be 0.85, and the discharge efficiency β when discharging the battery 120 is assumed to be 0.85.

[0065] First, the charging planning unit 1020 sets n, which will be used in steps S2020 to S2050 described later, to its initial value of 1 (S2010).

[0066] Next, the charging planning unit 1020 refers to the predicted electricity price and the predicted power generation of the PV power generation equipment 110 for the day for which the charge / discharge plan is to be created, as shown in Figure 4A, which are stored in the memory area 1072 of the memory unit 1070, and plans to charge the battery 120 with the power generated by the PV power generation equipment 110 for charging time slot C6, which is the first (n=1) in the charging time slot to have a low predicted electricity price (5 yen / kW). In charging time slot C6, since the predicted power generation of the PV power generation equipment 110 is greater than the capacity of the power conditioner 110A / 2, the planned amount of charge for the battery 120 is limited to 2.5 MWh, which is the capacity of the power conditioner 110A / 2 (S2020).

[0067] When charging the battery 120 with the electricity generated by the PV power generation equipment 110, it is necessary to consider the charging efficiency α of the battery 120. Therefore, the charging planning unit 1020 determines whether the total amount of charge in the battery 120 up to charging step C6, where the predicted electricity price is the lowest, is equal to or greater than "battery 120 capacity / charging efficiency α" (S2030).

[0068] If the total amount of charge in the battery 120 up to the first charging time C6, where the predicted electricity price is the lowest, is not equal to or greater than "battery 120 capacity / charging efficiency α" (S2030: NO), the charging planning unit 1020 changes n from 1 to 2 (S2040), and for the second charging time C7, where the predicted electricity price is the lowest (6.27 yen / kW), it repeats the process of steps S2020 and S2030 described above. In this embodiment, the charging planning unit 1020 increments n by +1 and repeatedly executes the process of steps S2020 and S2030 described above until n=10, that is, until it plans to charge the battery 120 with the power generated by the PV power generation equipment 110 for the charging time C10, where the predicted electricity price is the highest value (19.85 yen / kW) during the charging period. Furthermore, the planned charge amount for the battery 120 in charging stations C7, C8, C1, C5, C4, C3, C2, C9, and C10, which have the second to tenth lowest predicted electricity prices, is limited to 2.5 MWh, which is half the capacity of the power conditioner 110A, similar to charging station C6.

[0069] Then, since the total amount of charge in the battery 120 up to charging time C10, where the predicted electricity price is the lowest for the 10th time (n=10), that is, where the predicted electricity price is the highest during the charging period, will be greater than or equal to "battery capacity 120 / charging efficiency α" (S2030:YES), the charging planning unit 1020 calculates the planned amount of charge in the battery 120 at charging time C10 by subtracting the total amount of charge in the battery 120 up to charging time C9, where the predicted electricity price is the lowest for the 9th time (n=9), from the amount of charge of "battery capacity / charging efficiency α" so that the total amount of charge in the battery 120 up to the 10th time is equal to "battery capacity / charging efficiency α" (S2050).

[0070] The planned values ​​for the charge amount of the storage battery 120 in charging frames C1 to C10 obtained by executing the processes in steps S2010 to S2050 above are stored in the storage area 1073 of the storage unit 1070 as the initial charge plan values.

[0071] Next, the discharge planning unit 1030 sets m, which will be used in steps S2070 to S2100 described later, to its initial value of 1 (S2060).

[0072] Next, the discharge planning unit 1030 refers to the predicted electricity price and the predicted power output of the PV power generation equipment 110 on the day for which the charge / discharge plan is to be created, as shown in Figure 4A, and plans to discharge the battery 120 for discharge time slot D3, which has the highest predicted electricity price (26.17 yen / kW) among the discharge time slots (m=1). In discharge time slot D3, the planned discharge amount of the battery 120 is set to 2.5 MWh, which is half the capacity of the power conditioner 110A (S2070).

[0073] When discharging the battery 120, the discharge efficiency β of the battery 120 must be taken into consideration. Therefore, the discharge planning unit 1030 determines whether the total amount of discharge from the battery 120 up to discharge step D3, where the predicted value of the electricity price is the highest, is equal to or greater than "the capacity of the battery 120 × the discharge efficiency β" (S2080).

[0074] If the total discharge amount of the battery 120 up to discharge time D3, where the predicted electricity price is the highest, is not equal to or greater than "battery capacity 120 × discharge efficiency β" (S2080: NO), the discharge planning unit 1030 changes m from 1 to 2 (S2090), and then repeats the process of steps S2070 and S2080 for discharge time D4, where the predicted electricity price is the second highest (25.7 yen / kW) (m=2). In this embodiment, the discharge planning unit 1030 repeatedly executes the process of steps S2070 and S2080 until m=7, that is, until it plans to discharge the battery 120 for discharge time D7, where the predicted electricity price is the lowest (23.02 yen / kW) during the discharge period. Furthermore, the planned discharge amount of the battery 120 in discharge frames D4, D2, D5, D1, D6, and D7, which have the second to seventh highest predicted electricity prices, is limited to 2.5 MWh, which is half the capacity of the power conditioner 110A, similar to discharge frame D3.

[0075] Then, since the total discharge amount of the battery 120 up to discharge time D7, where the predicted electricity price is the highest in the seventh (m=7) timeframe, that is, where the predicted electricity price is the lowest in the discharge period, will be greater than or equal to "capacity of battery 120 × discharge efficiency β" (S2080:YES), the discharge planning unit 1030 calculates the planned discharge amount of the battery 120 at discharge time D7 by subtracting the total discharge amount of the battery 120 up to discharge time D6, where the predicted electricity price is the highest in the sixth timeframe (m=6), from the discharge amount of "capacity of battery 120 × discharge efficiency β" so that the total discharge amount of the battery 120 up to discharge time D7, where the predicted electricity price is the highest in the seventh timeframe, is equal to "capacity of battery 120 × discharge efficiency β" (S2100).

[0076] The planned discharge amounts of the battery 120 in discharge frames D1 to D7 obtained by executing the processes in steps S2060 to S2100 above are stored in the storage area 1074 of the storage unit 1070 as initial discharge plan values.

[0077] The charge / discharge plan creation unit 1060 creates the initial charge / discharge plan value for the target date for creating the charge / discharge plan shown in Figure 4B, based on the initial charge plan value stored in the memory area 1073 and the initial discharge plan value stored in the memory area 1074 (S2110). This initial charge / discharge plan value is stored in the memory area 1075 of the memory unit 1070.

[0078] Next, the first calculation unit 1040 calculates the first electricity selling price by charging and discharging the battery 120 based on the initial charge and discharge plan values ​​shown in Figure 4B stored in the storage area 1075 of the storage unit 1070 (S2120). Specifically, for each of the 48 time slots for which the charge and discharge plan is to be created, the first calculation unit 1040 calculates the electricity selling price of the battery 120 for each time slot by performing the calculation {(predicted value of the power output of the PV power generation equipment 110) - (planned value of the charge amount of the battery 120) + (planned value of the discharge amount of the battery 120)} × (predicted value of the electricity price). Furthermore, by adding the electricity selling prices of the battery 120 calculated for all time slots, the first electricity selling price (757,000 yen) for the day for which the charge and discharge plan is to be created is calculated. This first electricity selling price is added to the information of the initial charge and discharge plan values ​​shown in Figure 4B and stored again in the storage area 1075 of the storage unit 1070.

[0079] Since it is currently unknown whether the first electricity selling price calculated in step S2120 above is the highest electricity selling price on the day for which the charge / discharge plan is created, the following steps are performed to determine the highest electricity selling price.

[0080] The second calculation unit 1050 sets n, which will be used in steps S2140 to S2190 described later, to its initial value of 1 (S2130).

[0081] Next, the second calculation unit 1050 refers to the initial charge / discharge plan values ​​shown in Figure 4B, which are stored in the memory area 1075 of the memory unit 1070, and deletes the planned charge amount of the battery 120 in charging time slot C10, where the predicted electricity price is the first (n=1) high value (19.85 yen / kW) within the charging time period (1.029412 MWh), and updates it to 0 MWh (S2140). The updated planned charge amount of the battery 120 in the charging time period is stored in the memory area 1076 of the memory unit 1070 as the updated charge plan value.

[0082] Next, the second calculation unit 1050 refers to the initial charge / discharge plan values ​​shown in Figure 4B stored in the memory area 1075 of the memory unit 1070, and subtracts the amount of discharge corresponding to the planned charge amount of the battery 120 in charge time slot C10, which was deleted in step S2140 above, from the planned discharge amount of the battery 120 in discharge time slot D7, where the predicted electricity price is the lowest (23.02 yen / kW) during the discharge period (S2150). Specifically, the second calculation unit 1050 subtracts the amount of discharge obtained by multiplying the planned charge amount of the battery 120 in charge time slot C10 (1.029412 MWh) by the charging efficiency α (0.85) and the discharge efficiency β (0.85) from the planned discharge amount of the battery 120 in discharge time slot D7 (2 MWh). As a result, the planned discharge amount of the battery 120 in discharge time D7 is updated from 2 MWh to 1.25625 MWh. The updated planned discharge amount of the battery 120 during the discharge time period is stored in the storage area 1077 of the storage unit 1070 as the updated discharge plan value.

[0083] The charge / discharge plan creation unit 1060 creates the first charge / discharge plan update value for the target day for creating the charge / discharge plan shown in Figure 4C and stores it in the storage area 1078, based on the charge plan update value stored in the storage area 1076 and the discharge plan update value stored in the storage area 1077 of the storage unit 1070.

[0084] Next, the second calculation unit 1050 calculates the second electricity selling price (760,298 yen) by charging and discharging the battery 120, in the same manner as in step S2120 above, based on the first charge / discharge plan update value stored in the storage area 1078 of the storage unit 1070 (S2160). This second electricity selling price is added to the charge / discharge plan update value information shown in Figure 4C and stored again in the storage area 1078 of the storage unit 1070.

[0085] The charge / discharge plan creation unit 1060 compares the first electricity selling price calculated in step S2120 with the second electricity selling price (first update) calculated in step S2160 (S2170).

[0086] Since the second electricity selling price is higher than the first electricity selling price (S2170:YES), the charge / discharge plan creation unit 1060 provisionally sets the second electricity selling price (first update), calculated from the first charge / discharge plan update value, as the highest electricity selling price (S2180).

[0087] Next, the second calculation unit 1050 changes n from 1 to 2 (S2190) and executes the process from step S2140 onwards again.

[0088] The second calculation unit 1050 refers to the first charge / discharge plan update value shown in Figure 4C, which is stored in the memory area 1078 of the memory unit 1070, and deletes the planned charge amount of the battery 120 in charging time slot C9, where the predicted electricity price is the second highest (17.04 yen / kW) in the charging time slot (n=2), and updates it to 0 MWh (S2140). The updated planned charge amount of the battery 120 in the charging time slot is updated and stored in the memory area 1076 of the memory unit 1070 as the charge plan update value.

[0089] Next, the second calculation unit 1050 refers to the charge / discharge plan update value shown in Figure 4C, which is stored in the storage area 1078 of the storage unit 1070, and, in the discharge time period, among the discharge frames where the planned discharge value of the battery 120 is not 0 MWh, it subtracts the amount of discharge corresponding to the planned charge value of the battery 120 in charging frame C9, which was deleted in step S2140 above, from the planned discharge value of the battery 120 in discharge frame D7, which has the lowest predicted electricity price (S2150). Specifically, the second calculation unit 1050 subtracts the amount of discharge obtained by multiplying the planned charge value of the battery 120 in charging frame C9 (2.5 MWh) by the charging efficiency α (0.85) and the discharge efficiency β (0.85) from the planned discharge value of the battery 120 in discharge frame D7 (1.25625 MWh). As a result, the planned discharge amount of battery 120 in discharge time D7 is updated from 1.25625 MWh to 0 MWh. However, since it is not possible to completely remove all the discharge amounts obtained by multiplying the planned charge amount of battery 120 in the deleted charge time C9 by the charging efficiency α and the discharge efficiency β from the planned discharge amount of battery 120 in discharge time D7, the remaining discharge amount is removed from the planned discharge amount of battery 120 in discharge time D6 (2.5 MWh), where the predicted electricity price will be the next lowest. As a result, the planned discharge amount of battery 120 in discharge time D6 is updated from 2.5 MWh to 1.95 MWh. The planned discharge amount of battery 120 during this updated discharge time period is updated and stored in the storage area 1077 of the storage unit 1070 as the updated discharge plan value.

[0090] The charge / discharge plan creation unit 1060 creates the second charge / discharge plan update value for the target day for creating the charge / discharge plan shown in Figure 4D and stores it in the storage area 1078, based on the charge plan update value stored in the storage area 1076 and the discharge plan update value stored in the storage area 1077 of the storage unit 1070.

[0091] Next, the second calculation unit 1050 calculates the second electricity selling price (761,282 yen) by charging and discharging the battery 120, in the same manner as in step S2120 above, based on the second charge / discharge plan update value stored in the memory area 1078 of the storage unit 1070 (S2160). This second electricity selling price is added to the charge / discharge plan update value information shown in Figure 4D and stored again in the memory area 1078 of the storage unit 1070.

[0092] The charge / discharge plan creation unit 1060 compares the second electricity selling price (first update) calculated from the first charge / discharge plan update value shown in Figure 4C with the second electricity selling price (second update) calculated from the second charge / discharge plan update value shown in Figure 4D (S2170).

[0093] Since the second electricity selling price (second update) is higher than the second electricity selling price (first update) (S2170:YES), the charge / discharge plan creation unit 1060 provisionally sets the second electricity selling price (second update) to the highest electricity selling price (S2180).

[0094] Next, the second calculation unit 1050 changes n from 2 to 3 (S2190) and executes the process from step S2140 onwards again.

[0095] In this way, the process of step S2140 described above is repeatedly executed, and the third charge / discharge plan update value shown in Figure 4E and the fourth charge / discharge plan update value shown in Figure 4F are stored in the memory area 1078. In this embodiment, at this point, the second electricity selling price (76.2575 yen / kW) for the battery 120 calculated from the fourth charge / discharge plan update value is provisionally set as the highest value.

[0096] Next, the second calculation unit 1050 refers to the fourth charge / discharge plan update value shown in Figure 4F, which is stored in the memory area 1078 of the memory unit 1070, and deletes the planned charge amount of the battery 120 in charging time slot C4, where the predicted electricity price is the fifth (n=5) high value (16.12 yen / kW), and updates it to 0 MWh (S2140). The updated planned charge amount of the battery 120 in the charging time slot is updated and stored in the memory area 1076 of the memory unit 1070 as the charge plan update value.

[0097] Next, the second calculation unit 1050 refers to the charge / discharge plan update value shown in Figure 4F stored in the storage area 1078 of the storage unit 1070, and in the discharge time period, among the discharge frames where the planned discharge value of the battery 120 is not 0 MWh, it subtracts the amount of discharge corresponding to the planned charge value of the battery 120 in charging frame C4 which was deleted in step S2140 above, from the planned discharge value of the battery 120 in discharge frame D1 which has the lowest predicted electricity price (S2150). Specifically, the second calculation unit 1050 subtracts the amount of discharge obtained by multiplying the planned charge value of the battery 120 in charging frame C4 which was deleted (2.5 MWh) by the charging efficiency α (0.85) and the discharge efficiency β (0.85) from the planned discharge value of the battery 120 in discharge frame D1 (0.8375 MWh). As a result, the planned discharge amount of battery 120 in discharge time D7 is updated from 0.8375 MWh to 0 MWh. However, since it is not possible to completely remove all the discharge amounts obtained by multiplying the planned charge amount of battery 120 in the deleted charging time C4 by the charging efficiency α and the discharge efficiency β from the planned discharge amount of battery 120 in discharge time D1, the remaining discharge amounts are removed from the planned discharge amount of battery 120 in discharge time D5 (2.5 MWh), where the next predicted electricity price is low. As a result, the planned discharge amount of battery 120 in discharge time D5 is updated from 2.5 MWh to 1.53125 MWh. The planned discharge amount of battery 120 during this updated discharge time period is updated and stored in the storage area 1077 of the storage unit 1070 as the discharge plan update value.

[0098] The charge / discharge plan creation unit 1060 creates the fifth charge / discharge plan update value for the target day for charge / discharge plan creation, as shown in Figure 4G, based on the charge plan update value stored in the storage area 1076 of the storage unit 1070 and the discharge plan update value stored in the storage area 1077, and stores it in the storage area 1078.

[0099] Next, the second calculation unit 1050 calculates the second electricity selling price (759,767 yen) by charging and discharging the battery 120, in the same manner as in step S2120 above, based on the fifth charge / discharge plan update value stored in the memory area 1078 of the storage unit 1070 (S2160). This second electricity selling price is added to the charge / discharge plan update value information shown in Figure 4G and stored again in the memory area 1078 of the storage unit 1070.

[0100] The charge / discharge plan creation unit 1060 compares the second electricity selling price (4th update) calculated from the 4th charge / discharge plan update value in Figure 4F with the second electricity selling price (5th update) calculated from the 5th charge / discharge plan update value in Figure 4G (S2170).

[0101] Since the second electricity selling price (5th update) is cheaper than the second electricity selling price (4th update) (S2170:NO), the charge / discharge plan creation unit 1060 determines the second electricity selling price (4th update) as the highest electricity selling price and creates the charge / discharge plan update value shown in Figure 4G as a charge / discharge plan in which the electricity selling price of the battery 120 is the highest value (S2200).

[0102] <Second Embodiment> Figure 7A shows an example of the first charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 7A are stored in memory area 1078 in an associated manner for all 48 time slots on the day for which the charge / discharge plan of the battery 120 is created. This includes the discharge plan update values ​​(MWh) obtained by deleting the planned discharge amount for charge time slots C1 to C10, discharge time slots D1 to D7, and discharge time slot D7, where the predicted electricity price is the lowest (23.02 yen / kW) during the discharge period, and the charge plan update values ​​(MWh) obtained by deleting the charge amount corresponding to the discharge amount deleted in discharge time slot D7 from charge time slot C10, where the predicted electricity price is the highest (19.85 yen / kW) during the charge period, and charge time slot C9, where the predicted electricity price is the second highest (17.04 yen / kW).

[0103] Figure 7B shows an example of the second charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 7B are stored in memory area 1078 in an associated manner with all 48 time slots for the day on which the charge / discharge plan for the battery 120 is created. These include the discharge plan update values ​​(MWh) obtained by further deleting the planned discharge amount for charging time slots C1 to C10, discharging time slots D1 to D7, and discharging time slot D6, where the predicted electricity price during the discharging period is the second lowest (23.03 yen / kW), and the charge plan update values ​​(MWh) obtained by deleting the charge amount corresponding to the discharge amount deleted in discharging time slot D6 from charging time slot C9, charging time slot C2, where the predicted electricity price during the charging period is the second highest, charging time slot C2, where the predicted electricity price is the third highest (17 yen / kW), and charging time slot C3, where the predicted electricity price is the fourth highest (16.81 yen / kW).

[0104] Figure 7C shows an example of the third charge / discharge plan update values ​​stored in memory area 1078. The charge / discharge plan update values ​​in Figure 7C are stored in memory area 1078 in an associated manner with all 48 time slots for the day on which the charge / discharge plan for the battery 120 is created. These include the charge time slots C1 to C10, the discharge time slots D1 to D7, and the discharge plan update values ​​(MWh) obtained by further deleting the planned discharge amount for discharge time slot D1, where the predicted electricity price is the third lowest (23.04 yen / kW) during the discharge time slot. Additionally, the charge plan update values ​​(MWh) obtained by deleting the charge amount corresponding to the discharge amount deleted in discharge time slot D1 from charge time slot C3, where the predicted electricity price is the fourth highest (16.12 yen / kW) during the charge time slot, and charge time slot C4, where the predicted electricity price is the fifth highest (16.12 yen / kW).

[0105] Figures 8A and 8B are flowcharts illustrating an example of the process by which the charge / discharge plan creation device 100 creates a charge / discharge plan for the battery 120 on the designated day for creating the charge / discharge plan.

[0106] In Figure 6, the second calculation unit 1050 updates the charging plan by deleting the charge amount of one charging frame from the side with the higher predicted electricity price during the charging period. In the same period, it updates the discharge plan by deleting the discharge amount of a discharge frame from the side with the lower predicted electricity price during the discharging period until the discharge amount reaches the amount obtained by multiplying the deleted charge amount by the charging efficiency α and the discharging efficiency β. In contrast, in Figure 8, the second calculation unit 1050 updates the discharge plan by deleting the discharge amount of one discharge frame from the side with the lower predicted electricity price during the discharging period. In the same period, it updates the charging plan by deleting the charge amount of a charging frame from the side with the higher predicted electricity price during the charging period until the charge amount reaches the amount obtained by multiplying the deleted discharge amount by the reciprocal of the charging efficiency α and the reciprocal of the discharging efficiency β. The difference is that the second calculation unit 1050 performs the first process in the first embodiment and the second process in the second embodiment. In the second embodiment, Figure 3 used in the first embodiment is shared.

[0107] Furthermore, the processes in steps S3010 to S3120 in Figure 8 are identical to the processes in steps S2010 to S2120 in Figure 6, so their explanation will be omitted.

[0108] Hereinafter, an example of the processing operation of the charge / discharge plan creation device 100 according to the second embodiment will be described starting from step S3130, with reference to Figures 2, 3, 4A, 4B, and 7A to 7C.

[0109] The second calculation unit 1050 sets m, which will be used in steps S3140 to S3190 described later, to its initial value of 1 (S3130).

[0110] Next, the second calculation unit 1050 refers to the initial charge / discharge plan values ​​shown in Figure 4B, which are stored in the memory area 1075 of the memory unit 1070, and deletes the planned discharge amount of the battery 120 in discharge time slot D7, where the predicted electricity price is the lowest (23.02 yen / kW) for the first time (m=1) within the discharge time slot (2MWh), and updates it to 0MWh (S3140). The updated planned discharge amount of the battery 120 in the discharge time slot is stored in the memory area 1077 of the memory unit 1070 as the discharge plan update value.

[0111] Next, the second calculation unit 1050 refers to the initial charge / discharge plan values ​​shown in Figure 4B stored in the memory area 1075 of the memory unit 1070, and subtracts the amount of charge corresponding to the discharge amount of the battery 120 in discharge time D7, which was deleted in step S3140, from the planned charge amount of the battery 120 in charging time C10, which has the highest predicted electricity price (19.85 yen / kW) during the charging time period (S3150). Specifically, the second calculation unit 1050 subtracts the amount of charge obtained by multiplying the planned discharge amount of the battery 120 in discharge time D7 (2 MWh) by the reciprocal of the charging efficiency α and the reciprocal of the discharge efficiency β from the planned charge amount of the battery 120 in charging time C10 (1.029412 MWh). As a result, the planned charge amount of the battery 120 in charging time C10 is deleted and becomes 0 MWh. However, the planned charge amount for battery 120 in charging time slot C10 alone is insufficient to remove all the remaining charge amount obtained by multiplying the planned discharge amount for battery 120 in the deleted discharge time slot D7 by the reciprocal of the charging efficiency α and the reciprocal of the discharge efficiency β. Therefore, the remaining charge amount is removed from the planned charge amount for battery 120 in charging time slot C9 (2.5 MWh), which is the next highest predicted electricity price within the charging time period. As a result, the planned charge amount for battery 120 in charging time slot C9 is updated from 2.5 MWh to 0.761246 MWh. This updated planned charge amount for battery 120 during the charging time period is updated and stored in the storage area 1076 of the storage unit 1070 as the updated charging plan value.

[0112] The charge / discharge plan creation unit 1060 creates the first charge / discharge plan update value for the target day for creating the charge / discharge plan shown in Figure 7A and stores it in the storage area 1078, based on the charge plan update value stored in the storage area 1076 and the discharge plan update value stored in the storage area 1077 of the storage unit 1070.

[0113] Next, the second calculation unit 1050 calculates a second electricity selling price (760,982 yen) by charging and discharging the battery 120, based on the first charge / discharge plan update value stored in the storage area 1078 of the storage unit 1070, in the same manner as step S3120, which is equivalent to step S2120 of the first embodiment (S3160). This second electricity selling price is added to the charge / discharge plan update value information shown in Figure 7A and stored again in the storage area 1078 of the storage unit 1070.

[0114] The charge / discharge plan creation unit 1060 compares the first electricity selling price calculated in step S3120 with the second electricity selling price (first update) calculated in step S3160 (S3170).

[0115] Since the second electricity selling price (first update) is higher than the first electricity selling price (S3170:YES), the charge / discharge plan creation unit 1060 provisionally sets the second electricity selling price (first update), calculated from the first charge / discharge plan update value, as the highest electricity selling price (S3180).

[0116] Next, the second calculation unit 1050 changes m from 1 to 2 (S3190) and repeats the steps from S3140 onwards.

[0117] The second calculation unit 1050 refers to the first charge / discharge plan update value shown in Figure 7A, which is stored in the memory area 1078 of the memory unit 1070, and deletes the planned discharge amount of the battery 120 in discharge time slot D6, where the predicted electricity price is the second lowest (23.03 yen / kW) in the discharge time slot (m=2), and updates it to 0 MWh (S3140). The updated planned discharge amount of the battery 120 in the discharge time slot is updated and stored in the memory area 1077 of the memory unit 1070 as the discharge plan update value.

[0118] Next, the second calculation unit 1050 refers to the charge / discharge plan update value shown in Figure 7A stored in the storage area 1078 of the storage unit 1070, and, in the charging time period, among the charging frames where the planned charge amount of the battery 120 is not 0 MWh, it removes from the charge amount of the battery 120 in charging frame C9, which has the highest predicted electricity price, an amount corresponding to the planned discharge amount of the battery 120 in discharge frame D6, which was removed in step S3140 (S3150). Specifically, the second calculation unit 1050 removes from the planned charge amount of the battery 120 in charging frame C9 an amount obtained by multiplying the planned discharge amount of the battery 120 in discharge frame D6 (2.5 MWh) by the reciprocal of the charging efficiency α (0.85) and the reciprocal of the discharge efficiency β (0.85). As a result, the planned charge amount for battery 120 in charging step C9 is updated from 0.761246 MWh to 0 MWh. However, the planned charge amount for battery 120 in charging step C9 alone is not enough to remove all the charge amount obtained by multiplying the planned discharge amount for battery 120 in the deleted discharge step D6 by the reciprocal of the charging efficiency α and the reciprocal of the discharge efficiency β. Therefore, the remaining charge amount is removed from the planned charge amount for battery 120 in charging step C2, where the predicted electricity price is high. As a result, the planned charge amount for battery 120 in charging step C2 is updated from 2.5 MWh to 0 MWh. However, the planned charge amount for battery 120 in charging time C2 alone is not enough to remove all the remaining charge amount obtained by multiplying the planned discharge amount for battery 120 in the deleted discharge time D6 by the reciprocal of the charging efficiency α and the reciprocal of the discharge efficiency β. Therefore, the remaining charge amount is further removed from the planned charge amount for battery 120 in charging time C3, where the predicted electricity price will be high. As a result, the planned charge amount for battery 120 in charging time C3 is updated from 2.5 MWh to 2.301038 MWh. The updated planned charge amount for battery 120 during the charging time period is updated and stored in the storage area 1076 of the storage unit 1070 as the updated charging plan value.

[0119] The charge / discharge plan creation unit 1060 creates the second charge / discharge plan update value for the target day for charge / discharge plan creation, as shown in Figure 7B, based on the charge plan update value stored in the storage area 1076 of the storage unit 1070 and the discharge plan update value stored in the storage area 1077, and stores it in the storage area 1078.

[0120] Next, the second calculation unit 1050 calculates a second electricity selling price (762,199 yen) by charging and discharging the battery 120, in the same manner as in step S3120 above, based on the second charge / discharge plan update value stored in the storage area 1078 of the storage unit 1070 (S3160). This second electricity selling price is added to the charge / discharge plan update value information shown in Figure 7B and stored again in the storage area 1078 of the storage unit 1070.

[0121] The charge / discharge plan creation unit 1060 compares the second electricity selling price (first update) calculated from the first charge / discharge plan update value in Figure 7A with the second electricity selling price (second update) calculated from the second charge / discharge plan update value in Figure 7B (S3170).

[0122] Since the second electricity selling price (second update) is higher than the second electricity selling price (first update) (S3170:YES), the charge / discharge plan creation unit 1060 provisionally sets the second electricity selling price (second update) to the highest electricity selling price (S3180).

[0123] Next, the second calculation unit 1050 changes m from 2 to 3 (S3190) and repeats the steps from S3140 onwards.

[0124] The second calculation unit 1050 refers to the second charge / discharge plan update value shown in Figure 7B, which is stored in the memory area 1078 of the memory unit 1070, and deletes the planned discharge amount of the battery 120 in discharge time slot D1, where the predicted electricity price is the lowest (23.04 yen / kW) for the third time (m=3) within the discharge time period (2.5 MWh), and updates it to 0 MWh (S3140). The updated planned discharge amount of the battery 120 in the discharge time period is updated and stored in the memory area 1077 of the memory unit 1070 as the discharge plan update value.

[0125] Next, the second calculation unit 1050 refers to the charge / discharge plan update value shown in Figure 7B, which is stored in the storage area 1078 of the storage unit 1070, and, in the charging time period, among the charging frames where the planned charge amount of the battery 120 is not 0 MWh, it removes from the charge amount of the battery 120 in charging frame C3, which has the highest predicted electricity price, an amount corresponding to the planned discharge amount of the battery 120 in discharge frame D1, which was removed in step S3140 (S3150). Specifically, the second calculation unit 1050 removes from the planned charge amount of the battery 120 in charging frame C3 an amount obtained by multiplying the planned discharge amount of the battery 120 in discharge frame D1 (2.5 MWh) by the reciprocal of the charging efficiency α and the reciprocal of the discharge efficiency β. As a result, the planned charge amount of the battery 120 in charging frame C3 is updated from 2.301038 MWh to 0 MWh. However, the planned charge amount for battery 120 in charging time C3 alone is insufficient to remove all the discharge amounts obtained by multiplying the planned discharge amount for battery 120 in the deleted discharge time D1 by the reciprocal of the charging efficiency α and the reciprocal of the discharge efficiency β. Therefore, the remaining discharge amounts are removed from the planned charge amount for battery 120 in charging time C4, where the predicted electricity price is high. As a result, the planned charge amount for battery 120 in charging time C4 is updated from 2.5 MWh to 1.34083 MWh. The updated planned charge amount for battery 120 during the charging time period is updated and stored in the storage area 1076 of the storage unit 1070 as the updated charging plan value.

[0126] The charge / discharge plan creation unit 1060 creates the third charge / discharge plan update value for the target day for charge / discharge plan creation, as shown in Figure 7C, based on the charge plan update value stored in the storage area 1076 of the storage unit 1070 and the discharge plan update value stored in the storage area 1077, and stores it in the storage area 1078.

[0127] Next, the second calculation unit 1050 calculates the second electricity selling price (761,965 yen) by charging and discharging the battery 120, in the same manner as in step S3120 above, based on the third charge / discharge plan update value stored in the storage area 1078 of the storage unit 1070 (S3160). This second electricity selling price is added to the charge / discharge plan update value information shown in Figure 7C and stored again in the storage area 1078 of the storage unit 1070.

[0128] The charge / discharge plan creation unit 1060 compares the second electricity selling price (second update) calculated from the second charge / discharge plan update value in Figure 7B with the second electricity selling price (third update) calculated from the third charge / discharge plan update value in Figure 7C (S3170).

[0129] Since the second electricity selling price (3rd update) is not higher than the second electricity selling price (2nd update) (S3170:NO), the charge / discharge plan creation unit 1060 determines the second electricity selling price (2nd update) as the highest electricity selling price (S3180), and creates the charge / discharge plan update value shown in Figure 7B as a charge / discharge plan in which the electricity selling price of the battery 120 is the highest value (S3200).

[0130] <Third Embodiment> Figure 9 is a block diagram showing the main functions of the charge / discharge planning device 100 according to the third embodiment.

[0131] In Figure 9, a third calculation unit 1090 has been newly added as a function of the charge / discharge plan creation device 100. Note that in Figure 9, the second calculation unit 1050 is the same as the second calculation unit 1050 in the first embodiment, and the third calculation unit 1090 is the same as the second calculation unit 1050 in the second embodiment.

[0132] The second calculation unit 1050 calculates a second electricity selling price by performing the following process to confirm whether the first electricity selling price calculated by the first calculation unit 1040 is the highest electricity selling price on the day for which the charge / discharge plan for the storage battery 120 is created. Specifically, each time the second calculation unit 1050 updates the charging plan for the storage battery 120 by deleting the charge amount of one charging time slot from among the charging time slots C1 to C10 in the charging period, starting from the one with the highest predicted electricity price, it updates the discharge plan for the storage battery 120 by deleting the discharge amount of a discharge time slot from among the discharge time slots D1 to D7 in the discharging period, starting from the one with the lowest predicted electricity price, until it reaches a discharge amount corresponding to the deleted charge amount. Then, the second calculation unit 1050 calculates the second electricity selling price for the battery 120 for all 48 time slots of the day for which the charge and discharge plan for the battery 120 is to be created, using the predicted value of the power output of the PV power generation equipment 110, the updated charge plan value which is the planned amount of charge of the battery 120 updated during the charging time slot, and the updated discharge plan value which is the planned amount of discharge of the battery 120 updated during the discharging time slot.

[0133] The third calculation unit 1090 updates the discharge plan for the battery 120 by deleting the discharge amount of one discharge time slot from among the discharge time slots D1 to D7 in the discharge time period, starting with the one with the lowest predicted electricity price. At the same time, it updates the charge plan for the battery 120 by deleting the charge amount of charging time slots C1 to C10 in the charge time period, starting with the one with the highest predicted electricity price, until it reaches the charge amount corresponding to the deleted discharge amount. The third calculation unit 1090 then calculates the third electricity selling price for the battery 120 for all 48 time slots for the day for which the charge and discharge plans for the battery 120 are to be created, using the predicted output of the PV power generation equipment 110, the updated charge plan value which is the planned charge amount of the battery 120 updated in the charge time period, and the updated discharge plan value which is the planned discharge amount of the battery 120 updated in the discharge time period.

[0134] Figures 10A to 10C are flowcharts illustrating an example of the process by which the charge / discharge plan creation device 100 creates a charge / discharge plan for the battery 120 on the target day for creating the charge / discharge plan. Figures 10A to 10C show a combination of steps S2010 to S2190 from the series of processes in Figures 6A and 6B, and steps S3130 to S3200 from the series of processes in Figures 8A and 8B. Specifically, steps S4010 to S4190 in Figures 10A to 10C are the same as steps S2010 to S2190 in Figures 6A and 6B, and steps S4200 to S4260 in Figures 10A to 10C are the same as steps S3130 to S3190 in Figures 8A and 8B.

[0135] Then, the charge / discharge plan creation unit 1060 compares the second electricity selling price (4th update) shown in Figure 4F, which was provisionally set as the highest value in step S4180, with the third electricity selling price (2nd update) shown in Figure 7B, which was set as the highest value in step S4250 (S4240). Since the second electricity selling price (4th update) is higher than the third electricity selling price (2nd update), the unit determines the second electricity selling price (4th update) as the highest electricity selling price (S4270), and creates the charge / discharge plan update value shown in Figure 4F as a charge / discharge plan in which the electricity selling price of the battery 120 is the highest value.

[0136] In this way, by executing the processes in steps S4130 to S4190 and steps S4200 to S4260 within a series of processes, the accuracy of creating a charge / discharge plan that maximizes the electricity selling price can be improved.

[0137] Furthermore, in the series of processes shown in Figures 10A to 10C, the processes in steps S4130 to S4190 and steps S4200 to S4260 may be swapped, and the series of processes may be executed.

[0138] As described above, the charge and discharge plan creation device 100 creates a charge and discharge plan for a battery 120 that charges the power generated by a PV power generation facility 110 that generates electricity using solar power, and also discharges the charged power. The charge and discharge plan creation device 100 includes a charge planning unit 1020 that creates a charge plan in which the battery 120 is charged until it reaches its capacity in a charging time period that includes charging frames C1 to C10 where the predicted value of the electricity price on the day for which the charge and discharge plan is to be created is 19.85 yen / kW (first price) or less, in a charging frame order that moves from the lowest price to the highest price of the predicted electricity price, and a charge planning unit 1020 that creates a charge plan in which the battery 120 is charged until it reaches its capacity, in a charging time period that includes charging frames C1 to C10 where the predicted value of the electricity price is 23.02 yen / kW (second price) or more, in a discharge time period that includes discharge frames D1 to D7 where the predicted value of the electricity price moves from the highest price to the lowest price of the predicted electricity price, and The system includes: a discharge planning unit 1030 that creates a discharge plan to discharge the storage battery 120 until it reaches a capacity of 0; a first calculation unit 1040 that calculates a first electricity selling price on the day the charge / discharge plan is to be created based on the above charge plan and discharge plan; a second calculation unit 1050 that updates the discharge plan by deleting the charge amount of one charge slot from the side with the higher predicted electricity price, and then deleting the discharge amount of the discharge slots from the side with the lower predicted electricity price until it reaches a discharge amount corresponding to the deleted charge amount, and calculates a second electricity selling price on the day the charge / discharge plan is to be created based on the updated charge plan and discharge plan; and a charge / discharge plan creation unit 1060 that creates a charge / discharge plan based on the charge plan and discharge plan that have the highest electricity selling price among the first and second electricity selling prices.

[0139] Furthermore, the charge and discharge plan creation device 100 creates a charge and discharge plan for a battery 120 that charges with electricity generated by a PV power generation facility 110 that generates electricity using solar power, and discharges the charged electricity. The charge and discharge plan creation device 100 includes a charge planning unit 1020 that creates a charge plan in which, during a charging time period that includes charging frames C1 to C10 where the predicted value of the electricity price on the day for which the charge and discharge plan is to be created, the battery 120 is charged in the order of charging frames from the lowest price to the highest price, until the battery 120 reaches its capacity, and a discharge time period that includes discharge frames D1 to D7 where the predicted value of the electricity price is 23.02 yen / kW (second price) or higher, the battery 120 is charged in the order of discharge frames from the highest price to the lowest price, until the battery 120 reaches its capacity. The system includes: a discharge planning unit 1030 that creates a discharge plan to discharge the battery 120 until it reaches a certain level; a first calculation unit 1040 that calculates a first electricity selling price on the day the charge / discharge plan is created based on the above charge plan and discharge plan; a second calculation unit 1050 that updates the charge plan by deleting the charge amount of a charge frame from the side with the highest predicted electricity price until it reaches a charge amount corresponding to the deleted discharge amount, and calculates a second electricity selling price on the day the charge / discharge plan is created based on the updated charge plan and discharge plan; and a charge / discharge plan creation unit 1060 that creates a charge / discharge plan based on the charge plan and discharge plan that result in the highest electricity selling price among the first and second electricity selling prices.

[0140] Furthermore, the charge and discharge plan creation device 100 creates a charge and discharge plan for a battery 120 that charges with electricity generated by a PV power generation facility 110 that generates electricity using solar power, and discharges the charged electricity. The device includes a charge planning unit 1020 that creates a charge plan in which, during a charging time period including charging frames C1 to C10 where the predicted electricity price on the day for which the charge and discharge plan is to be created is 19.85 yen / kW (first price) or less, the battery 120 is charged in the order of charging frames from the lowest predicted electricity price to the highest predicted electricity price until the battery 120 reaches its capacity; a discharge planning unit 1030 that creates a discharge plan in which, during a discharge time period including discharge frames D1 to D7 where the predicted electricity price is 23.02 yen / kW (second price) or more, the battery 120 is discharged in the order of discharge frames from the highest predicted electricity price to the lowest predicted electricity price until the battery 120 reaches its capacity; and a first electricity selling price on the day for which the charge and discharge plan is to be created based on the above charge and discharge plans. The system includes a first calculation unit 1040, a second calculation unit 1050 which updates the discharge plan by deleting the charge amount of one charging slot from the side with the higher predicted electricity price until it reaches the discharge amount corresponding to the deleted charge amount, starting from the side with the lower predicted electricity price, and calculates the second electricity selling price for the day the charge / discharge plan is created based on the updated charge plan and discharge plan, a third calculation unit 1090 which updates the discharge plan by deleting the charge amount of one charging slot from the side with the lower predicted electricity price until it reaches the charge amount corresponding to the deleted discharge amount, starting from the side with the higher predicted electricity price, and calculates the third electricity selling price for the day the charge / discharge plan is created based on the updated charge plan and discharge plan, and a charge / discharge plan creation unit 1060 which creates a charge / discharge plan based on the charge plan and discharge plan that have the highest electricity selling price among the first electricity selling price, the second electricity selling price, and the third electricity selling price.

[0141] According to the charge / discharge plan creation device 100, it is possible to create a charge / discharge plan for a storage battery that maximizes the electricity selling price and thus maximizes profits.

[0142] Furthermore, in the charge / discharge planning device, the discharge time period is the time period after the charge time period.

[0143] The charge-discharge plan created by the charge-discharge plan creation device 100 is a plan in which, on the day for which the charge-discharge plan for the storage battery 120 is created, the storage battery is charged in bulk during the daytime when the predicted electricity price is relatively low, and the storage battery is discharged in bulk during the nighttime when the predicted electricity price is relatively high. As a result, the storage battery 120 does not have to repeat the charge-discharge operation frequently, and it is possible to prevent the premature decline in charge efficiency and discharge efficiency.

[0144] This embodiment is provided to facilitate understanding of the present invention and is not intended to limit its interpretation. The present invention may be modified or improved without departing from its spirit, and equivalents thereof are also included. [Explanation of symbols]

[0145] 1. Power generation system 100 Charge / Discharge Planning Device 110 PV power generation facilities 110A, 120A Power Conditioner 120 Battery Storage 130 Battery Control Device 150 Weather Information Provisioning Device 160 Electricity Price Prediction Device 170 Power Generation Prediction Device 180 Communication Networks 190 Power system 1010 Input Section 1020 Charging Planning Department 1030 Discharge Planning Department 1040 First Calculation Unit 1050 Second Calculation Unit 1060 Charge / Discharge Planning Department 1070 Storage section 1071~1078 Storage area 1080 Output Section 1090 Third Calculation Unit

Claims

1. A charge / discharge planning device that creates a charge / discharge plan for a battery that charges the electricity generated by a power generation facility that uses renewable energy and discharges the charged electricity, A charging planning unit creates a charging plan that, during a charging time period that includes multiple charging frames where the predicted value of the electricity price on the day for which the charge-discharge plan is to be created is less than or equal to a first price, charges the battery until it reaches its capacity, in the order of the charging frames where the predicted value of the electricity price progresses from a low price to a high price. A discharge planning unit creates a discharge plan in which, during a discharge period that includes a plurality of discharge frames in which the predicted value of the electricity price is equal to or greater than the second price which is equal to or greater than the first price, the discharge is carried out in the order of the discharge frames in which the predicted value of the electricity price moves from a high price to a low price until the capacity of the storage battery is reached. A first calculation unit calculates the first electricity selling price on the day for which the charge / discharge plan is created, based on the charge plan and the discharge plan. Each time the charging plan is updated by deleting the charge amount of one of the charging frames from the higher side of the predicted electricity price, the discharge plan is updated by deleting the discharge amount of the discharge frames from the lower side of the predicted electricity price until the discharge amount corresponding to the deleted charge amount is reached, and the second calculation unit calculates the second electricity selling price for the day for which the charge / discharge plan is created based on the updated charging plan and the discharge plan. A charge / discharge plan creation unit creates the charge / discharge plan based on the charge plan and the discharge plan which have the highest electricity selling price among the first electricity selling price and the second electricity selling price, A charge / discharge planning device that includes this feature.

2. A charge / discharge planning device that creates a charge / discharge plan for a battery that charges the electricity generated by a power generation facility that uses renewable energy and discharges the charged electricity, A charging planning unit creates a charging plan that, during a charging time period that includes multiple charging frames where the predicted value of the electricity price on the day for which the charge-discharge plan is to be created is less than or equal to a first price, charges the battery until it reaches its capacity, in the order of the charging frames where the predicted value of the electricity price progresses from a low price to a high price. A discharge planning unit creates a discharge plan in which, during a discharge period that includes a plurality of discharge frames in which the predicted value of the electricity price is equal to or greater than the second price which is equal to or greater than the first price, the discharge is carried out in the order of the discharge frames in which the predicted value of the electricity price moves from a high price to a low price until the capacity of the storage battery is reached. A first calculation unit calculates the first electricity selling price on the day for which the charge / discharge plan is created, based on the charge plan and the discharge plan. Each time the discharge plan is updated by deleting the discharge amount of one of the discharge units from the lower end of the predicted electricity price, the charge plan is updated by deleting the charge amount of the charge units from the higher end of the predicted electricity price until the charge amount corresponding to the deleted discharge amount is reached, and the second calculation unit calculates the second electricity selling price for the day for which the charge / discharge plan is created based on the updated charge plan and the discharge plan. A charge / discharge plan creation unit creates the charge / discharge plan based on the charge plan and the discharge plan which have the highest electricity selling price among the first electricity selling price and the second electricity selling price, A charge / discharge planning device that includes this feature.

3. A charge / discharge planning device that creates a charge / discharge plan for a battery that charges the electricity generated by a power generation facility that uses renewable energy and discharges the charged electricity, A charging planning unit creates a charging plan that, during a charging time period that includes multiple charging frames where the predicted value of the electricity price on the day for which the charge-discharge plan is to be created is less than or equal to a first price, charges the battery until it reaches its capacity, in the order of the charging frames where the predicted value of the electricity price progresses from a low price to a high price. A discharge planning unit creates a discharge plan in which, during a discharge period that includes a plurality of discharge frames in which the predicted value of the electricity price is equal to or greater than the second price which is equal to or greater than the first price, the discharge is carried out in the order of the discharge frames in which the predicted value of the electricity price moves from a high price to a low price until the capacity of the storage battery is reached. A first calculation unit calculates the first electricity selling price on the day for which the charge / discharge plan is created, based on the charge plan and the discharge plan. Each time the charging plan is updated by deleting the charge amount of one of the charging frames from the higher side of the predicted electricity price, the discharge plan is updated by deleting the discharge amount of the discharge frames from the lower side of the predicted electricity price until the discharge amount corresponding to the deleted charge amount is reached, and the second calculation unit calculates the second electricity selling price for the day for which the charge / discharge plan is created based on the updated charging plan and the discharge plan. Each time the discharge plan is updated by deleting the discharge amount of one of the discharge units from the lower end of the predicted electricity price, the charge plan is updated by deleting the charge amount of the charge units from the higher end of the predicted electricity price until the charge amount corresponding to the deleted discharge amount is reached, and the third calculation unit calculates the third electricity selling price on the day for which the charge / discharge plan is created based on the updated charge plan and the discharge plan. A charge / discharge plan creation unit creates the charge / discharge plan based on the charge plan and the discharge plan which have the highest electricity selling price among the first electricity selling price, the second electricity selling price, and the third electricity selling price, A charge / discharge planning device that includes this feature.

4. A charge / discharge planning device according to any one of claims 1 to 3, The aforementioned discharge period is the period after the aforementioned charging period. Charge / discharge planning device.

5. A method for creating a charge and discharge plan for a battery that charges with electricity generated by a power generation facility that uses renewable energy, and discharges the charged electricity, In a charging time period that includes multiple charging frames where the predicted electricity price on the day for which the charge / discharge plan is created is less than or equal to the first price, a charging plan is created in which the battery is charged until its capacity is reached, in the order of the charging frames where the predicted electricity price moves from the lowest price to the highest price. In a discharge period that includes multiple discharge frames where the predicted value of the electricity price is equal to or greater than the second price which is equal to or greater than the first price, a discharge plan is created in which the discharge frames are arranged in an order from the highest price to the lowest price of the predicted electricity price, and the discharge is carried out until the capacity of the storage battery is reached. Based on the charging plan and the discharging plan, the first electricity selling price for the day for which the charging and discharging plan is created is calculated. Each time the charging plan is updated by deleting the charge amount of one of the charging frames from the higher-than-expected electricity price, the discharge plan is updated by deleting the discharge amount of the discharge frames from the lower-than-expected electricity price until the discharge amount reaches the amount corresponding to the deleted charge amount. Based on the updated charging plan and discharge plan, the second electricity selling price for the day for which the charging and discharging plan was created is calculated. Based on the charging plan and the discharging plan that result in the highest electricity selling price among the first and second electricity selling prices, the charge / discharge plan is created. Method for creating a charge / discharge plan.

6. A method for creating a charge and discharge plan for a battery that charges with electricity generated by a power generation facility that uses renewable energy, and discharges the charged electricity, In a charging time period that includes multiple charging frames where the predicted electricity price on the day for which the charge / discharge plan is created is less than or equal to the first price, a charging plan is created in which the battery is charged until its capacity is reached, in the order of the charging frames where the predicted electricity price moves from the lowest price to the highest price. In a discharge period that includes multiple discharge frames where the predicted value of the electricity price is equal to or greater than the second price which is equal to or greater than the first price, a discharge plan is created in which the discharge frames are arranged in an order from the highest price to the lowest price of the predicted electricity price, and the discharge is carried out until the capacity of the storage battery is reached. Based on the charging plan and the discharging plan, the first electricity selling price for the day for which the charging and discharging plan is created is calculated. Each time the discharge plan is updated by removing the discharge amount of one of the discharge units from the lower end of the predicted electricity price, the charge plan is updated by removing the charge amount of the charge units from the higher end of the predicted electricity price until the charge amount corresponding to the removed discharge amount is reached, and the second electricity selling price for the day for which the charge / discharge plan was created is calculated based on the updated charge plan and the discharge plan. Based on the charging plan and the discharging plan that result in the highest electricity selling price among the first and second electricity selling prices, the charge / discharge plan is created. Method for creating a charge / discharge plan.

7. A method for creating a charge and discharge plan for a battery that charges with electricity generated by a power generation facility that uses renewable energy, and discharges the charged electricity, In a charging time period that includes multiple charging frames where the predicted electricity price on the day for which the charge / discharge plan is created is less than or equal to the first price, a charging plan is created in which the battery is charged until its capacity is reached, in the order of the charging frames where the predicted electricity price moves from the lowest price to the highest price. In a discharge period that includes multiple discharge frames where the predicted value of the electricity price is equal to or greater than the second price which is equal to or greater than the first price, a discharge plan is created in which the discharge frames are arranged in an order from the highest price to the lowest price of the predicted electricity price, and the discharge is carried out until the capacity of the storage battery is reached. Based on the charging plan and the discharging plan, the first electricity selling price for the day for which the charging and discharging plan is created is calculated. Each time the charging plan is updated by deleting the charge amount of one of the charging frames from the higher-than-expected electricity price, the discharge plan is updated by deleting the discharge amount of the discharge frames from the lower-than-expected electricity price until the discharge amount reaches the amount corresponding to the deleted charge amount. Based on the updated charging plan and discharge plan, the second electricity selling price for the day for which the charging and discharging plan was created is calculated. Each time the discharge plan is updated by removing the discharge amount of one of the discharge units from the lower end of the predicted electricity price, the charge plan is updated by removing the charge amount of the charge units from the higher end of the predicted electricity price until the charge amount corresponding to the removed discharge amount is reached, and the third electricity selling price for the day for which the charge / discharge plan was created is calculated based on the updated charge plan and the discharge plan. Based on the charging plan and the discharging plan that have the highest electricity selling price among the first electricity selling price, the second electricity selling price, and the third electricity selling price, the charge / discharge plan is created. Method for creating a charge / discharge plan.

8. A method for creating a charge / discharge plan according to any one of claims 5 to 7, The aforementioned discharge period is the period after the aforementioned charging period. Method for creating a charge / discharge plan.

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