Storage battery control plan preparation system

Abstract

To provide a storage battery control plan preparation system which can efficiently increase profits of selling electricity.SOLUTION: A storage battery control plan preparation system 100 for preparing a plan for controlling charge and discharge of a storage battery 31 includes: a control plan preparation unit (an operation unit 120) for preparing a control plan (step S20 in Fig. 3) on the basis of a predicted value (step S11 in Fig. 3) of the power generation amount of a photovoltaic generation unit 21 and a predicted value (step S12 in Fig. 3) of a wholesale electricity market price; and a control plan modification unit (an operation unit 120) for modifying a control plan (S36 in Fig. 5) on the basis of the fixed value (a spot price fixed value) of the wholesale electricity market price and a predicted value of an imbalance fee.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a technology for a battery control plan creation system that creates a control plan for charging and discharging a storage battery. [Background technology]

[0002] Conventionally, a battery control plan creation system that creates a control plan for charging and discharging a battery is known, as described in Patent Document 1, for example.

[0003] Patent Document 1 discloses a management device that creates a charge / discharge plan for a storage battery based on the predicted power generation value of a photovoltaic power generation device and the predicted transaction price value in the wholesale electricity market. In the technology described in Patent Document 1, the predicted value of the electricity sales revenue is increased by creating a charge / discharge plan for the storage battery as described above.

[0004] However, if the final transaction price in the wholesale electricity market differs significantly from the predicted price, it may not be possible to effectively increase the revenue from selling electricity. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7048797 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and the problem to be solved by the present invention is to provide a battery control plan creation system that can effectively increase revenue from selling electricity. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, claim 1 provides a battery control plan creation system that creates a control plan for charging and discharging a battery, and includes a control plan creation unit that creates the control plan based on a predicted value of the power generation amount of a solar power generation unit and a predicted value of the wholesale electricity market price, and a control plan correction unit that can correct the control plan based on the confirmed value of the wholesale electricity market price and the predicted value of the imbalance fee.

[0009] In claim 2, the control plan creation unit charges the storage battery in a low price band where the predicted value of the wholesale electricity market price is low, and discharges the storage battery in a high / low price band where the predicted value of the wholesale electricity market price is higher than the low price band by a predetermined price or more.

[0010] In claim 3, the control plan correction unit calculates a charge / discharge price difference, which is the difference between the determined value of the wholesale electricity market price for the time period when the storage battery is scheduled to discharge and the determined value of the wholesale electricity market price for the time period when the storage battery is scheduled to charge, and if the predicted value of the imbalance fee is predicted to be equal to or greater than the charge / discharge price difference, corrects the control plan, and if the predicted value of the imbalance fee is predicted to be less than or equal to the charge / discharge price difference, does not correct the control plan.

[0011] In claim 4, when the predicted value of the imbalance fee is predicted to be equal to or greater than the charge / discharge price difference, the control plan correction unit corrects the control plan so as to reduce or increase the amount of electricity generated by the solar power generation unit charged by the storage battery during a time period in which the storage battery charges the electricity generated by the solar power generation unit.

[0012] In claim 5, the present invention further includes an electricity trading plan creation unit that creates an electricity trading plan in the wholesale electricity market based on the control plan, and the electricity trading plan creation unit creates an electricity trading plan for the intraday market so that if the amount of electricity generated by the storage battery is reduced during a time period when the storage battery is charging the electricity generated by the solar power generation unit, the amount of electricity discharged during a time period when the storage battery is scheduled to discharge can be compensated for. Effect of the Invention

[0013] The present invention has the following advantages.

[0014] According to claim 1, the revenue from selling electricity can be effectively increased.

[0015] According to claim 2, the revenue from selling electricity can be increased more effectively.

[0016] According to claim 3, the revenue from selling electricity can be increased more effectively.

[0017] In claim 4, it is possible to suppress imbalance charges.

[0018] In claim 5, it is possible to suppress imbalance charges. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a block diagram showing the configuration of a power generation system. [Diagram 2] 1 is a block diagram showing a configuration of a battery control plan creation system according to an embodiment of the present invention; [Diagram 3] 4 is a flowchart showing plan creation control for creating a battery control plan and a power trading plan. [Figure 4] 1 is a graph showing an example of changes in wholesale electricity market prices over a day. [Diagram 5] 5 is a flowchart showing plan correction control for correcting the battery control plan and the power trading plan. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A battery control plan creation system 100 according to one embodiment of the present invention will be described below.

[0021] A battery control plan creation system 100 according to one embodiment of the present invention creates a control plan (hereinafter referred to as a "battery control plan") for charging and discharging a battery 31 in a power generation system 1 shown in Fig. 1. The battery control plan creation system 100 also creates a power buying and selling plan (hereinafter referred to as a "power buying and selling plan") in the wholesale power market. The configuration of the power generation system 1 will be described below first with reference to Fig. 1.

[0022] The power generation system 1 shown in Fig. 1 generates power by utilizing solar light. In this embodiment, the power generation system 1 is a solar power plant equipped with a power storage station. A user of the power generation system 1 and the battery control plan creation system 100 is, for example, a power generation company. The power generation system 1 mainly includes a power generation system 20, a power storage system 30, and a control device 40.

[0023] The power generation system 20 is capable of generating power by utilizing sunlight. The power generation system 20 includes a solar power generation unit 21 and a power conditioner 22.

[0024] The solar power generation unit 21 is a device that generates power by utilizing sunlight. The solar power generation unit 21 is configured with a solar cell panel and the like. The solar power generation unit 21 is installed in a sunny location such as on the roof of a building. The solar power generation unit 21 is connected to a power conditioner 22, which will be described later.

[0025] The power conditioner 22 is a power conditioner capable of appropriately converting electric power. The power conditioner 22 is connected to the solar power generation unit 21 as described above.

[0026] The power storage system 30 is capable of charging and discharging electric power. The power storage system 30 includes a storage battery 31 and a power conditioner 32.

[0027] The storage battery 31 is capable of charging and discharging electric power. The storage battery 31 is, for example, a lithium ion battery. The storage battery 31 is connected to a power conditioner 32, which will be described later.

[0028] The inverter 32 is a power conditioner capable of appropriately converting electric power. As described above, the inverter 32 is connected to the storage battery 31. The inverter 32 is also connected to the power distribution line L on a side closer to the system power source S than the inverter 22.

[0029] The control device 40 controls the operation mode of the power storage system 30. The control device 40 is connected to the power conditioner 32 of the power storage system 30.

[0030] The control device 40 can control the storage battery 31 via the power conditioner 32. More specifically, the control device 40 controls charging and discharging of the storage battery 31 via the power conditioner 32 based on a storage battery control plan created in advance. The storage battery control plan is created by a storage battery control plan creation system 100.

[0031] The power generation system 1 configured in this manner can charge the storage battery 31 with power generated by the solar power generation unit 21. The power generation system 1 can also purchase power from a grid power source S and charge the storage battery 31. The power generation system 1 can also sell power discharged from the storage battery 31 by reverse power flow to the grid power source S. Power is bought and sold in the wholesale electricity market.

[0032] The main wholesale electricity markets are the day-ahead market (spot market) and the intraday market (hours ahead market). The day-ahead market is a market where electricity is traded the day before actual supply and demand. In the day-ahead market, trading takes place for 48 products (48 frames), dividing the day into 30-minute increments. Meanwhile, the intraday market is a market where trading takes place up to one hour before actual supply and demand, and is mainly responsible for adjusting any surplus or shortage in the day-ahead market.

[0033] In general, the electricity market price in the wholesale electricity market (hereinafter referred to as the "wholesale electricity market price") is relatively low during late night and daytime hours when demand is low, and is relatively high during early morning and nighttime hours when demand is high. For this reason, it is possible to increase the revenue from selling electricity (revenue from selling electricity) by charging the storage battery 31 during late night and daytime hours when the wholesale electricity market price is relatively low, and discharging the storage battery 31 during early morning and nighttime hours when the wholesale electricity market price is relatively high.

[0034] In order to increase the profits from selling electricity obtained by charging and discharging the storage battery 31, the storage battery control plan creation system 100 creates a storage battery control plan (a control plan for charging and discharging the storage battery 31). The storage battery control plan creation system 100 plans control of charging and discharging the storage battery 31 so that the storage battery 31 is charged during late night or daytime hours when the wholesale electricity market price is relatively low, and the storage battery 31 is discharged during early morning or nighttime hours when the wholesale electricity market price is relatively high.

[0035] As shown in FIG. 2, the battery control plan creation system 100 includes an acquisition unit 110 and a calculation unit 120.

[0036] The acquisition unit 110 acquires various types of information. The acquisition unit 110 can acquire information for predicting the amount of power generated by the solar power generation unit 21 (such as weather forecasts and past data on the amount of power generated by the solar power generation unit 21), a final value of the wholesale electricity market price, and the like, via a network such as the Internet.

[0037] The calculation unit 120 performs various calculations, such as creating a storage battery control plan and a power trading plan.

[0038] The calculation unit 120 creates a battery control plan and a power trading plan by executing the plan creation control shown in Fig. 3. A method for creating the battery control plan and the power trading plan will be described below with reference to the flowchart shown in Fig. 3. Bidding in the wholesale power market (day-ahead market) is conducted based on the power trading plan created by executing the plan creation control shown in Fig. 3. Since bidding in the day-ahead market needs to be completed by 10:00 a.m., the plan creation control shown in Fig. 3 is executed by 10:00 a.m. on the day when bidding in the day-ahead market is conducted.

[0039] In the following, the day on which bidding takes place in the day-ahead market will be referred to as the "same day," and the day of actual supply and demand (i.e., the day after the day on which bidding takes place in the day-ahead market) will be referred to as the "next day."

[0040] In step S11, the calculation unit 120 acquires the prediction result of the solar power generation amount for the next day. Here, "solar power generation amount" means the amount of power generated by the solar power generation unit 21. The calculation unit 120 predicts the solar power generation amount for the next day based on the weather forecast for the next day and data on the past solar power generation amount acquired via the acquisition unit 110. In this way, the calculation unit 120 acquires the prediction result of the solar power generation amount for the next day.

[0041] After performing the process of step S11, the calculation unit 120 proceeds to step S12.

[0042] In step S12, the calculation unit 120 acquires the prediction result of the wholesale electricity market price. The wholesale electricity market price here refers to the electricity market price (contract price) in the day-ahead market. The calculation unit 120 acquires the prediction result of the wholesale electricity market price based on the prediction result of the solar power generation amount for the next day acquired in step S11, data on past wholesale electricity market prices, etc. The prediction result of the wholesale electricity market price is acquired for 48 frames dividing a day into 30-minute units.

[0043] After performing the process of step S12, the calculation unit 120 proceeds to step S13.

[0044] In step S13, the arithmetic unit 120 determines whether or not there is at least one state in which the price difference between the high price range and the low price range is X yen or more in the predicted result of the wholesale power market price acquired in step S12. Here, the "high price range" means a time period when the wholesale power market price (predicted value) is relatively high, for example, a time period when the wholesale power market price is equal to or higher than a predetermined threshold value a. The "low price range" means a time period when the wholesale power market price is relatively low, for example, a time period when the wholesale power market price is equal to or lower than a predetermined threshold value b (b < a).

[0045] In the present embodiment, as shown in FIG. 4, it is assumed that the wholesale power market price is low during late night and daytime, and high during early morning and night within a day (late night, early morning, daytime, night). Therefore, in the predicted result of the wholesale power market price acquired by the arithmetic unit 120 in step S12, the arithmetic unit 120 compares the kWh unit price of power in each frame (30 minutes) of the high price range (early morning, night) with the kWh unit price of power in each frame (30 minutes) of the low price range immediately before the high price range (late night when the high price range is early morning, daytime when the high price range is night), and determines whether or not there is at least one state in which the price difference between the two (the value obtained by subtracting the kWh unit price of power in the low price range from the kWh unit price of power in the high price range) is X yen or more. Note that, as the kWh unit price of the high price range or the low price range, the maximum value, the minimum value, the average value, or the like of each frame can be adopted.

[0046] For example, when at least one of the price differences between the late night power unit price and the early morning power unit price, or the daytime power unit price and the night power unit price is X yen or more, the arithmetic unit 120 determines that there is at least one state in which the price difference between the charging unit price and the selling unit price is X yen or more. On the other hand, when neither the price difference between the late night power unit price and the early morning power unit price nor the price difference between the daytime power unit price and the night power unit price is X yen or more, the arithmetic unit 120 determines that there is no state in which the price difference between the charging unit price and the selling unit price is X yen or more.

[0047] If the calculation unit 120 determines that the price difference between the high price range and the low price range is X yen or more at least once ("YES" in step S13), it proceeds to step S14. On the other hand, if the calculation unit 120 determines that the price difference between the high price range and the low price range is not X yen or more at least once ("NO" in step S13), it proceeds to step S17.

[0048] If the price difference between the high price range and the low price range is X yen or more at least once (YES in step S13), it means that a (certain or more) profit can be expected by charging the storage battery 31 in the low price range and discharging the storage battery 31 in the high price range. On the other hand, if the price difference between the high price range and the low price range is not X yen or more at least once (NO in step S13), it means that a (certain or more) profit cannot be expected by charging and discharging the storage battery 31.

[0049] When the calculation unit 120 moves from step S13 to step S14, the calculation unit 120 repeats the process from step S14 to step S16 the number of times that the price difference between the high price range and the low price range is equal to or greater than X yen.

[0050] In step S14, the calculation unit 120 determines the charging time of the storage battery 31 in the low price range according to the number of frames in the high price range. The charging time of the storage battery 31 in the low price range is set to a charging time that can cover the discharge amount when the storage battery 31 is discharged at the maximum output in the frame of the high price range. If the maximum discharge amount [kW] and the maximum charge amount [kW] of the storage battery 31 are the same, for example, when the number of frames in the high price range in the early morning is four frames, the calculation unit 120 determines the charging time of the storage battery 31 in the low price range in the late night to be four frames (i.e., 30 minutes x 4 frames = 2 hours), which is the same as the number of frames in the high price range. The charging frames (frames in which the storage battery 31 charges) of the storage battery 31 are selected in order of the lowest predicted value of the wholesale electricity market price for the same number of frames as the number of frames in the high price range. In this way, the time period (frames) in which the storage battery 31 discharges and the time period (frames) in which the storage battery 31 charges are determined, and the storage battery control plan is provisionally set. For example, during a charging session in the middle of the night, the storage battery 31 is charged with purchased power. During a charging session in the daytime, the storage battery 31 is charged with power generated by the solar power generation unit 21, and is charged with purchased power as necessary.

[0051] After performing the process of step S14, the calculation unit 120 proceeds to step S15.

[0052] In step S15, the calculation unit 120 determines whether or not all price differences (between the discharge unit price and the charge unit price) in the determined charge / discharge time periods are equal to or greater than X yen in the battery control plan provisionally set in step S14. Here, the "discharge unit price" refers to the (predicted value of) wholesale electricity market price in the discharge frame of the storage battery 31 (the frame in which the storage battery 31 discharges), and the "charge unit price" refers to the (predicted value of) wholesale electricity market price in the charge frame of the storage battery 31.

[0053] When the calculation unit 120 determines that all the price differences in the determined charging and discharging time periods are equal to or greater than X yen ("YES" in step S15), the calculation unit 120 proceeds to step S20. On the other hand, when the calculation unit 120 determines that all the price differences in the determined charging and discharging time periods are not equal to or greater than X yen ("NO" in step S15), the calculation unit 120 proceeds to step S16.

[0054] In step S16, the calculation unit 120 reduces the number of charging frames (the number of charging frames of the storage battery 31) and the number of discharging frames (the number of discharging frames of the storage battery 31) by one frame each. Specifically, the calculation unit 120 excludes the frame with the highest predicted value of the wholesale electricity market price from the charging frames. Also, the calculation unit 120 excludes the frame with the lowest predicted value of the wholesale electricity market price from the discharging frames.

[0055] After performing the process of step S16, calculation unit 120 proceeds to step S15. In this manner, the processes from step S14 to step S16 are repeated until the price difference between the discharge price and the charge price becomes equal to or greater than X yen for all combinations of frames.

[0056] Meanwhile, in step S17, the calculation unit 120 determines whether the imbalance suppression flag is on or not. Here, the "imbalance suppression flag" is a flag indicating that control for suppressing imbalance is executed. Note that "imbalance" refers to the difference between the planned value and the actual value of the amount of power supply. When an imbalance occurs, the power generation company may need to pay an imbalance fee. For this reason, it is required to suppress (reduce) the imbalance. The imbalance suppression flag is set on / off by, for example, the user.

[0057] If the calculation unit 120 determines that the imbalance suppression flag is on ("YES" in step S17), the process proceeds to step S18. On the other hand, if the calculation unit 120 determines that the imbalance suppression flag is not on ("NO" in step S17), the process proceeds to step S19.

[0058] In step S18, the calculation unit 120 determines the control of the storage battery 31 so as to suppress the imbalance. If there is a discrepancy between the buying and selling bid amount in the wholesale electricity market and the actual power generation amount of the solar power generation unit 21 on the next day, the calculation unit 120 charges and discharges the storage battery 31 so as to eliminate the discrepancy. After performing the process of step S18, the calculation unit 120 proceeds to step S20.

[0059] On the other hand, in step S19, the calculation unit 120 puts the storage battery 31 into standby all day in the storage battery control plan. After performing the process of step S19, the calculation unit 120 proceeds to step S20.

[0060] In this way, if the result of step S17 is NO, charging and discharging of the storage battery 31 is not used for suppressing the imbalance, and therefore charging and discharging of the storage battery 31 is not performed.

[0061] In step S20, the calculation unit 120 creates a battery control plan for the next day based on the charging frames and discharging frames of the storage battery 31 assigned in steps S14 to S16, etc., and transmits the created battery control plan to the control device 40 that controls the storage battery 31. After performing the process of step S20, the calculation unit 120 proceeds to step S21.

[0062] In step S21, the calculation unit 120 creates an electricity buying and selling plan (electricity buying and selling plan) in the wholesale electricity market based on the storage battery control plan created in step S20. After performing the process of step S21, the calculation unit 120 ends the plan creation control shown in FIG.

[0063] 3, a battery control plan that is a control plan for charging and discharging the battery 31 can be created, and an electricity trading plan that is a plan for buying and selling electricity in the wholesale electricity market (day-ahead market) can be created based on the battery control plan. Based on the electricity trading plan, users (power generation companies) can bid desired buying and selling prices and amounts for 48 time periods divided into 30-minute intervals in the wholesale electricity market (day-ahead market) by 10:00 on the day.

[0064] After bidding in the day-ahead market is conducted at 10:00 on the same day, the final value of the wholesale electricity market price in the day-ahead market (hereinafter referred to as the "final spot price") is published at around 10:30 on the same day. After the final spot price is published, the battery control plan creation system 100 executes the plan revision control shown in Fig. 5 to revise the battery control plan before bidding in the intraday market.

[0065] Specifically, the battery control plan creation system 100 (the calculation unit 120) calculates a predicted value of the imbalance fee (hereinafter referred to as the "predicted imbalance fee value") based on the bid details in the day-ahead market, the confirmed spot price value, etc. Then, the battery control plan creation system 100 (the calculation unit 120) compares the confirmed spot price value with the predicted imbalance fee value, and modifies the battery control plan as necessary.

[0066] The plan modification control shown in FIG. 5 will be specifically described below.

[0067] In step S31, the calculation unit 120 acquires the confirmed spot price in the wholesale electricity market (day-ahead market) via the acquisition unit 110. After performing the process of step S31, the calculation unit 120 proceeds to step S32.

[0068] In step S32, the calculation unit 120 acquires an imbalance fee prediction value. The calculation unit 120 calculates and acquires the imbalance fee prediction value based on the bidding contents in the day-ahead market, the spot price confirmation value acquired in step S31, past imbalance fee data, etc. After performing the process of step S32, the calculation unit 120 proceeds to step S33.

[0069] When the calculation unit 120 moves from step S32 to step S33, the calculation unit 120 repeats the process from step S33 to step S37 the same number of times as the number of charging frames.

[0070] In step S33, the calculation unit 120 determines whether or not the corresponding charging frame (the charging frame that is the subject of the determination in step S33) is a PV power generation frame in the storage battery control plan. Here, a "PV power generation frame" refers to a frame in which the solar power generation unit 21 is scheduled to generate power among 48 frames obtained by dividing a day into 30-minute units in the storage battery control plan. In other words, the calculation unit 120 determines whether or not the corresponding charging frame is a frame (e.g., daytime) in which power generated by the solar power generation unit 21 is charged (i.e., a frame in which power generated by the solar power generation unit 21 is included in the power charged by the storage battery 31).

[0071] When the calculation unit 120 determines that the corresponding charging frame in the battery control plan is a PV power generation frame ("YES" in step S33), the process proceeds to step S34. On the other hand, when the calculation unit 120 determines that the corresponding charging frame in the battery control plan is not a PV power generation frame ("NO" in step S33), the calculation unit 120 ends the plan correction control shown in FIG.

[0072] If the charging frame is a PV power generation frame (YES in step S33), this means that there is a risk of imbalance occurring due to weather. On the other hand, if the charging frame is not a PV power generation frame (NO in step S33), this means that there is no risk of imbalance occurring because power generation by the solar power generation unit 21 is not scheduled in the first place.

[0073] In step S34, the calculation unit 120 determines whether the imbalance fee prediction value is equal to or greater than Y yen. Here, "Y yen" can be any threshold value determined in consideration of the profit and loss of the user (power generation company). For example, when the amount of power generation by the solar power generation unit 21 is predicted to be less than that initially assumed (when the battery control plan was created), the imbalance fee is predicted to be high.

[0074] If the calculation unit 120 determines that the imbalance fee predicted value is Y yen or more ("YES" in step S34), the process proceeds to step S36. On the other hand, if the calculation unit 120 determines that the imbalance fee predicted value is not Y yen or more ("NO" in step S34), the process proceeds to step S35.

[0075] In step S35, the calculation unit 120 determines whether the imbalance fee prediction value is greater than the charge / discharge price difference of the fixed spot price (imbalance fee prediction value ≧ charge / discharge price difference of the fixed spot price). Here, the "charge / discharge price difference" refers to a value obtained by subtracting the fixed spot price of the corresponding charging frame from the lowest fixed spot price of the discharging frame.

[0076] If the calculation unit 120 determines that the imbalance fee prediction value is equal to or greater than the fixed spot price difference ("YES" in step S35), the process proceeds to step S36. On the other hand, if the calculation unit 120 determines that the imbalance fee prediction value is not equal to or greater than the fixed spot price difference ("NO" in step S35), the process proceeds to step S38.

[0077] If the imbalance fee prediction value is equal to or greater than the fixed spot price difference between the charging and discharging prices (YES in step S35), this means that it is predicted that the payment of the imbalance fee will offset the revenue obtained by charging and discharging the storage battery 31 (no profit will be obtained). On the other hand, if the imbalance fee prediction value is not equal to or greater than the fixed spot price difference between the charging and discharging prices (NO in step S35), this means that it is predicted that the profit obtained by charging and discharging the storage battery 31 will exceed the payment of the imbalance fee. For this reason, if the result is NO in step S35, the initial battery control plan is not revised. On the other hand, if the result is YES in step S35, the initial battery control plan is revised in step S36, which will be described later.

[0078] In step S36, the calculation unit 120 modifies the storage battery control plan so as to prioritize imbalance suppression. Specifically, in a frame that is a charging frame and a PV power generation frame (e.g., daytime), when it is predicted that the amount of power generated by the photovoltaic power generation unit 21 will be less than initially assumed (at the time of creating the storage battery control plan), the amount of power generated by the photovoltaic power generation unit 21 charged to the storage battery 31 can be reduced to suppress a decrease in the amount of power generated by the photovoltaic power generation unit 21 supplied to the market. For this reason, the calculation unit 120 modifies the storage battery control plan so as to reduce the amount of power charged to the storage battery 31 by the amount of power generated by the photovoltaic power generation unit 21 that has decreased from the amount initially assumed (at the time of creating the storage battery control plan) in a frame that is a charging frame and a PV power generation frame (e.g., daytime). On the other hand, in a frame that is both a charging frame and a PV power generation frame, when it is predicted that the amount of power generated by the solar power generation unit 21 will be greater than initially expected, the calculation unit 120 modifies the battery control plan so as to increase the amount of charge of the storage battery 31 by the amount of increase in the amount of power generated by the solar power generation unit 21 from the initially expected amount.

[0079] After performing the process of step S36, the calculation unit 120 proceeds to step S37.

[0080] In step S37, the calculation unit 120 turns on a correction flag. Here, the "correction flag" is a flag indicating that the battery control plan has been corrected. After performing the process of step S37, the calculation unit 120 proceeds to step S38.

[0081] In step S38, the calculation unit 120 determines whether the correction flag is on. If the calculation unit 120 determines that the correction flag is on ("YES" in step S38), the process proceeds to step S39. On the other hand, if the calculation unit 120 determines that the correction flag is not on ("NO" in step S38), the plan correction control shown in FIG. 5 is terminated.

[0082] In step S39, the calculation unit 120 creates a power buying and selling plan for the intraday market (hours ahead market) for the difference from the initial battery control plan.

[0083] Here, when the storage amount of the storage battery 31 decreases in a frame that is both a charging frame and a PV power generation frame (e.g., daytime) due to the correction of the storage battery control plan in step S36, the amount of discharge from the storage battery 31 in a discharging frame (e.g., nighttime) may decrease. For this reason, the calculation unit 120 needs to adjust the amount of power purchased in the intraday market to compensate for the decrease in the amount of discharge in the discharging frame. Therefore, the calculation unit 120 creates an electricity trading plan for the intraday market so as to compensate for the decrease in the amount of discharge in the discharging frame. Based on the electricity trading plan, a user (power generation business operator) can bid a desired trading price and trading amount in the intraday market up to one hour before the target discharging frame.

[0084] However, in the intraday market, a desired transaction is not necessarily concluded, and in some cases, it may not be possible to compensate for the decrease in the discharge amount in the discharge frame. Therefore, if a bid in the intraday market is not concluded (does not match the desire), it is economically advantageous to pay the imbalance fee, so the battery control plan corrected in step S36 is returned to the original (the battery control plan before correction). After performing the process of step S39, the calculation unit 120 ends the plan correction control shown in FIG. 5.

[0085] As described above, in the battery control plan creation system 100 according to one embodiment of the present invention, the storage battery 31 is charged during late night or daytime hours when the wholesale electricity market price is relatively low, and the storage battery 31 is discharged during early morning or nighttime hours when the wholesale electricity market price is relatively high, thereby improving the revenue from selling electricity.

[0086] In addition, after the wholesale electricity market price in the day-ahead market is determined, the determined value of the wholesale electricity market price in the day-ahead market (determined spot price value) is compared with the predicted value of the imbalance fee, and if it is predicted that the payment of the imbalance fee would offset the revenue obtained from charging and discharging the storage battery 31 (i.e., no profit would be obtained) (YES in step S35 of FIG. 5), the battery control plan can be modified to further improve the revenue from selling electricity.

[0087] As described above, the battery control plan creation system 100 according to this embodiment has the following features: A battery control plan creation system 100 that creates a control plan for charging and discharging a battery 31, a control plan creation unit (calculation unit 120) that creates the control plan (step S20 in FIG. 3) based on a predicted value of the amount of power generated by the solar power generation unit 21 (step S11 in FIG. 3) and a predicted value of the wholesale power market price (step S12 in FIG. 3); A control plan correction unit (calculation unit 120) capable of correcting the control plan based on the final value of the wholesale electricity market price (final spot price value) and the predicted value of the imbalance charge (step S36 in FIG. 5); It is equipped with the following.

[0088] With this configuration, the revenue from selling electricity can be effectively increased.

[0089] In addition, the control plan creation unit (calculation unit 120) The storage battery 31 is charged in a low price band where the predicted value of the wholesale electricity market price is low, and the storage battery 31 is discharged in a high / low price band where the predicted value of the wholesale electricity market price is higher than the low price band by a predetermined price (X yen) or more.

[0090] With this configuration, the revenue from selling electricity can be increased more effectively.

[0091] In addition, the control plan correction unit (calculation unit 120) A charge / discharge price difference is calculated, which is the difference between the determined value of the wholesale electricity market price in the time period (discharging frame) when the storage battery 31 is scheduled to discharge and the determined value of the wholesale electricity market price in the time period (charging frame) when the storage battery 31 is scheduled to charge (step S35 in FIG. 5 ). If the predicted value of the imbalance fee is predicted to be equal to or greater than the charge / discharge price difference (YES in step S35 of FIG. 5), the control plan is modified (step S36 of FIG. 5). If the predicted value of the imbalance fee is predicted to be less than or equal to the charge / discharge price difference (NO in step S35 of FIG. 5), the control plan is not modified.

[0092] With this configuration, the revenue from selling electricity can be increased more effectively.

[0093] In addition, the control plan correction unit (calculation unit 120) If the predicted value of the imbalance fee is predicted to be equal to or greater than the charge / discharge price difference (YES in step S35 of FIG. 5), the control plan is modified (step S36 of FIG. 5) so as to reduce or increase the amount of electricity generated by the solar power generation unit 21 charged by the storage battery 31 during the time period in which the storage battery 31 charges the electricity generated by the solar power generation unit 21 (a frame that is both a charging frame and a PV power generation frame).

[0094] With this configuration, it is possible to suppress imbalance charges.

[0095] In addition, the battery control plan creation system 100 according to this embodiment includes: A power trading plan creation unit (calculation unit 120) is provided that creates a power trading plan in the wholesale power market based on the control plan, The power trading plan creation unit (calculation unit 120) If the amount of electricity generated by the solar power generation unit 21 charged by the storage battery 31 is reduced during a time period when the storage battery is charging the electricity generated by the solar power generation unit 21 (a frame that is both a charging frame and a PV power generation frame), an electricity trading plan for the intraday market is created so as to compensate for the amount of electricity discharged during a time period when the storage battery 31 is scheduled to discharge (a discharging frame).

[0096] With this configuration, it is possible to suppress imbalance charges.

[0097] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0098] For example, in this embodiment, the control device 40 is configured to be provided outside the energy storage system 30, but it may also be configured to be provided inside the energy storage system 30, such as by being incorporated inside the storage battery 31, and the configuration is not limited thereto.

[0099] Further, in the present embodiment, the battery control plan creation system 100 is configured to be provided outside the control device 40, but it may be configured to be provided inside the control device 40, and the configuration is not limited thereto. [Explanation of symbols]

[0100] 21 Solar Power Generation Department 31 Storage battery 100 Battery control planning system 120 Arithmetic section

Claims

1. A battery control plan creation system for creating a control plan for charging and discharging a battery, a control plan creation unit that creates the control plan based on a predicted value of the power generation amount of the photovoltaic power generation unit and a predicted value of the wholesale electricity market price; A control plan correction unit capable of correcting the control plan based on the final value of the wholesale electricity market price and the predicted value of the imbalance charge; Equipped with Battery control planning system.

2. The control plan creation unit The storage battery is charged in a low price band in which the predicted value of the wholesale electricity market price is low, and the storage battery is discharged in a high / low price band in which the predicted value of the wholesale electricity market price is higher than the low price band by a predetermined price or more. The battery control plan creation system according to claim 1 .

3. The control plan correction unit Calculating a charge / discharge price difference between the determined value of the wholesale electricity market price during the time period when the storage battery is scheduled to discharge and the determined value of the wholesale electricity market price during the time period when the storage battery is scheduled to charge; When the predicted value of the imbalance fee is predicted to be equal to or greater than the charge / discharge price difference, the control plan is modified; When the predicted value of the imbalance fee is predicted to be less than or equal to the charge / discharge price difference, the control plan is not modified. The battery control plan creation system according to claim 1 .

4. The control plan correction unit When the predicted value of the imbalance fee is predicted to be equal to or greater than the charge / discharge price difference, the control plan is modified so as to reduce or increase the amount of the power generated by the solar power generation unit charged by the storage battery during a time period in which the storage battery charges the power generated by the solar power generation unit. The battery control plan creation system according to claim 3 .

5. a power trading plan creation unit that creates a power trading plan in the wholesale power market based on the control plan; The power trading plan creation unit creating an electricity buying and selling plan for an intraday market so that, when the amount of electricity charged by the storage battery to the generated electricity of the solar power generation unit is reduced during a time period in which the storage battery is charged with the generated electricity of the solar power generation unit, the amount of electricity discharged during a time period in which the storage battery is scheduled to discharge can be compensated for; The battery control plan creation system according to claim 4.

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