Charge-discharge planning system

Abstract

To provide a charge / discharge plan creation system capable of easily responding to a request for output suppression.SOLUTION: A charging and discharging plan creation unit that creates a charging and discharging plan on the basis of a predicted value of the amount of power generated by the photovoltaic power generation unit 11 and a predicted value of a wholesale power market price; When the output suppression plan including the target time period (suppression frame) of the output suppression and the output upper limit value is distributed, the predicted excess time period (suppression frame in which YES in step S12) in which the power selling amount is predicted to exceed the output upper limit value in the target time period is set as the scheduled charging time period (charging frame) in which the storage battery 12 is charged so that the power selling amount does not exceed the output upper limit value based on the output suppression plan (step S14). And a second plan correction unit that re-corrects the charging and discharging plan on the basis of output suppression determination information when the output suppression determination information including determination information of a target time period and an output upper limit value of output suppression is distributed after the output suppression plan.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a technology for a charge / discharge plan creation system that creates a charge / discharge plan for a storage battery. [Background technology]

[0002] Conventionally, a charge / discharge plan creation system that creates a charge / discharge plan for a storage battery has been publicly 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 solar power generation device and the predicted trading price value in the wholesale electricity market. The technology described in Patent Document 1 aims to increase the predicted value of revenue from selling electricity by creating a charge / discharge plan for the storage battery as described above.

[0004] Here, when the amount of power generated by a solar power generation device exceeds the power demand, the electric power company (general electricity transmission and distribution company) may request the power generation company to suppress output. When output suppression is requested, the power generation company is required to suppress the output of the solar power generation device during the time period subject to output suppression. Therefore, when a request for output suppression is received, the power generation company can respond to the request for output suppression without wasting the power by charging the power from the solar power generation device into a storage battery during the time period subject to output suppression.

[0005] On the other hand, although output curtailment plans are distributed the day before the target output curtailment date, the target time period for output curtailment and the curtailment rate plan may be subject to change. Also, since output curtailment confirmation information is distributed two hours before the target time period, even if an attempt is made to revise the battery charge / discharge plan at this point, it may not be possible to comply with the output curtailment request, for example, because there is no available capacity for charging the battery. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7048797 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and the problem it aims to solve is to provide a charge / discharge plan creation system that can easily respond to requests for output suppression. [Means for solving the problem]

[0008] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0009] That is, in claim 1, there is provided a charge / discharge plan creation system for creating a charge / discharge plan for the storage battery in a power selling system that has a power generating unit capable of generating electricity using natural energy and a storage battery that can charge and discharge electricity from the power generating unit and can sell electricity from the power generating unit, the system comprising: a charge / discharge plan creation unit that creates the charge / discharge plan based on a predicted value of the power generation amount of the power generating unit and a predicted value of the wholesale electricity market price; a first plan correction unit that, when an output suppression plan including a plan for a target time period for output suppression and an output upper limit value is distributed, corrects the charge / discharge plan by setting, based on the output suppression plan, a predicted excess time period in which the amount of electricity sold by the power selling system during the target time period is predicted to exceed the output upper limit value, as a planned charging time period in which the storage battery will be charged so that the amount of electricity sold does not exceed the output upper limit value; and a second plan correction unit that, when output suppression confirmation information including confirmation information for the target time period for output suppression and the output upper limit value is distributed after the output suppression plan, re-corrects the charge / discharge plan based on the output suppression confirmation information.

[0010] In claim 2, when the storage battery is predicted to be fully charged by the end of the target time period as a result of setting the predicted excess time period as the planned charging time period, the first plan correction unit sets the planned value of the charge amount of the storage battery during the predicted excess time period to the excess amount of the sold electricity over the output upper limit value, and subtracts the excess amount from the planned value of the charge amount of the storage battery during time periods other than the predicted excess time period.

[0011] In claim 3, the first plan correction unit is capable of increasing the planned value of the amount of discharge from the storage battery in a time period before the predicted excess time period when, as a result of setting the predicted excess time period as the planned charging time period, it is predicted that the storage battery will be fully charged by the end of the target time period.

[0012] In claim 4, the first plan correction unit is capable of selecting a time period during which to increase the planned value of the discharge amount from the storage battery based on a time period during which the predicted value of the imbalance charge unit price is low or a predicted value of the wholesale electricity market unit price.

[0013] In claim 5, when the remaining amount of stored electricity of the storage battery exceeds the planned value during the planned discharge time period when the storage battery discharges as a result of setting the predicted excess time period to the planned charge time period, the first plan correction unit can increase the amount of discharge of the storage battery or decrease the amount of charge of the storage battery during the time period before the planned discharge time period, and can select the time period during which the amount of discharge of the storage battery is increased or the amount of charge of the storage battery is decreased based on the predicted value of the imbalance fee unit price.

[0014] In claim 6, when the remaining amount of electricity stored in the storage battery is insufficient for the planned value during the planned discharge time period when the storage battery is discharged as a result of setting the predicted excess time period to the planned charge time period, the first plan correction unit can reduce the amount of electricity discharged from the storage battery or increase the amount of electricity charged to the storage battery during the time period before the planned discharge time period, and can select the time period during which the amount of electricity discharged from the storage battery is reduced or the amount of electricity charged to the storage battery is increased based on the predicted value of the imbalance fee unit price.

[0015] In claim 7, the second plan correction unit is capable of restoring the planned value of the charge or discharge amount of the storage battery during a time period that is no longer subject to output suppression among the target time periods in the output suppression plan to the planned value of the charge or discharge amount of the storage battery in the charge / discharge plan before being corrected by the first plan correction unit. [Effects of the Invention]

[0016] The present invention has the following effects.

[0017] In the present invention, it is possible to easily respond to requests for output suppression. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a block diagram showing the configuration of an electricity selling system and a charge / discharge plan creation system according to an embodiment of the present invention; [Figure 2] 10 is a flowchart showing a part of the first plan correction control after receiving the output suppression plan. [Figure 3] 3 is a flowchart showing a continuation of the first plan correction control in FIG. 2; [Figure 4] 10 is a flowchart showing a part of the second plan correction control after receiving output suppression confirmation information. [Figure 5] 5 is a flowchart showing a continuation of the second plan correction control in FIG. 4 . [Figure 6]10A is a graph showing an example of a daily change in the amount of power in the initial plan, and FIG. 10B is a graph showing an example of the state of the amount of power when the process of step S14 of the first plan correction control is performed. [Figure 7] 10 is a graph showing an example of a change in the amount of power over one day in the charge / discharge plan after correction by the first plan correction control. [Figure 8] 1A is a graph showing an example of a daily change in the amount of power in a charge / discharge plan before correction by the second plan correction control, and FIG. 1B is a graph showing an example of a daily change in the amount of power in a charge / discharge plan after correction by the second plan correction control. DETAILED DESCRIPTION OF THE INVENTION

[0019] A charge / discharge plan creation system 100 according to one embodiment of the present invention will be described below.

[0020] A charge / discharge plan creation system 100 according to one embodiment of the present invention creates a plan for charging and discharging (hereinafter referred to as a "charge / discharge plan") for the storage battery 12 of the power selling system 1 shown in Fig. 1. First, the configuration of the power selling system 1 will be described below with reference to Fig. 1.

[0021] The power selling system 1 shown in Fig. 1 is for selling electric power. The power selling system 1 is connected to a power grid S. A user of the power selling system 1 and the charge / discharge plan creation system 100 is, for example, a power generation company. The power selling system 1 includes a solar power generation unit 11, a storage battery 12, a power conditioner 13, a power meter 14, and an EMS 15.

[0022] The solar power generation unit 11 is a device that generates power using sunlight. The solar power generation unit 11 is configured with a solar cell panel or the like. The solar power generation unit 11 is connected to a power grid S via a distribution line L1. In this embodiment, the capacity of the solar power generation unit 11 is set to 1,000 kW. The output of the solar power generation unit 11 is set to 500 kW.

[0023] The power meter 14 detects the power flowing through the distribution line L1. The power meter 14 is provided between the system power supply S and a power conditioner 13 (described later). The power meter 14 is electrically connected to, for example, the power conditioner 13 and the EMS 15, and can transmit the detection results to the power conditioner 13 and the EMS 15.

[0024] The storage battery 12 charges and discharges power. The storage battery 12 is configured, for example, by a lithium-ion battery. The storage battery 12 is connected to a location midway through the distribution line L1 (hereinafter referred to as "connection point P") via the distribution line L2. That is, the storage battery 12 is connected to the grid power supply S and the solar power generation unit 11 via the distribution line L2 and the distribution line L1. In this manner, the storage battery 12 is configured to be able to be charged with power from the grid power supply S (purchased power) and power generated by the solar power generation unit 11 (generated power). In this embodiment, the capacity of the storage battery 12 is set to 500 kWh. The maximum charge / discharge amount of the storage battery 12 is set to 100 kW.

[0025] The storage battery 12 is configured to be able to operate in a plurality of operating modes. Specifically, the storage battery 12 has a standby mode, a charge mode, and a discharge mode as the plurality of modes, and is configured to be able to selectively select and operate one of these modes. The mode of the storage battery 12 is switched by the EMS 15, which will be described later.

[0026] The standby mode is a mode in which the storage battery 12 does not charge or discharge. Specifically, the storage battery 12 in the standby mode is in a standby state without charging or discharging during a time period instructed by the EMS 15.

[0027] The charge mode is a mode in which the storage battery 12 charges. Specifically, the storage battery 12 in the charge mode charges a predetermined amount of power instructed by the EMS 15 during a time period instructed by the EMS 15. When the charge mode is executed in this manner, the storage battery 12 can adjust the charge amount relative to the power generated by the solar power generation unit 11, and therefore can adjust (for example, keep the amount of power output from the inverter 13 to the grid power supply S) the amount of power.

[0028] The discharge mode is a mode in which the storage battery 12 discharges electricity. Specifically, the storage battery 12 in the discharge mode discharges the maximum amount of electricity during the time period instructed by the EMS 15.

[0029] The power conditioner 13 is a device (hybrid power conditioner) that converts power as needed. The power conditioner 13 is provided midway along the power distribution line L1, upstream of the connection point P. In this way, the power conditioner 13 is configured to be able to appropriately convert the power generated by the solar power generation unit 11 and the power discharged from the storage battery 12 (discharged power) and output the converted power to the grid power source S. The power conditioner 13 is also configured to be able to appropriately change the power purchased from the grid power source S and output the converted power to the storage battery 12.

[0030] The EMS 15 is an energy management system that manages the operation of the power selling system 1. The EMS 15 includes a storage unit such as a RAM or a ROM, an arithmetic processing unit such as a CPU, an input / output unit such as an I / O, etc. The EMS 15 can perform predetermined arithmetic processing, storage processing, etc. Various information and programs used to control the operation of the power selling system 1 are stored in advance in the EMS 15.

[0031] The EMS 15 is electrically connected to the inverter 13. The EMS 15 can acquire various information related to the storage battery 12 and the solar power generation unit 11 from the inverter 13. The various information includes information such as the operating status of the storage battery 12 (for example, the currently running mode), the remaining amount of power stored, the amount of discharged power, the amount of chargeable power, and the amount of power generated. Note that the EMS 15 may acquire the information from the storage battery 12 or the solar power generation unit 11 instead of from the inverter 13.

[0032] The EMS 15 can also control the storage battery 12 by issuing instructions related to operation to the storage battery 12 via the inverter 13. Specifically, the EMS 15 can arbitrarily switch the mode of the storage battery 12. The EMS 15 can also instruct the specific amount of power to be charged or discharged when the storage battery 12 is in the charge mode or the discharge mode. The control of the storage battery 12 by the EMS 15 is executed based on a charge / discharge plan created by a charge / discharge plan creation system 100, which will be described later. The EMS 15 may also issue instructions directly to the storage battery 12 without going through the inverter 13.

[0033] The EMS 15 can also transmit and receive various types of information via a network such as the Internet. For example, the EMS 15 can acquire information such as an output curtailment plan and output curtailment confirmation, which will be described later, from an electric power company (general power transmission and distribution business operator). The EMS 15 can also transmit the information acquired from the electric power company (output curtailment plan, output curtailment confirmation information, etc.) to the charge and discharge plan creation system 100, which will be described later. The EMS 15 can also acquire a charge and discharge plan for the storage battery 12, etc., from the charge and discharge plan creation system 100.

[0034] As described above, the power selling system 1 is configured to be able to charge the storage battery 12 with the power generated by the solar power generation unit 11 and the power purchased from the grid power supply S. The power selling system 1 can also sell the power generated by the solar power generation unit 11 and the power discharged from the storage battery 12 by outputting (reverse power supplying) the power from the power conditioner 13 to the grid power supply S. In this embodiment, the buying and selling of power is carried out in the wholesale power market.

[0035] The main wholesale electricity markets are the day-ahead market (spot market) and the intraday market (hour-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. On the other hand, 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.

[0036] Generally, the electricity market price in the wholesale electricity market (hereinafter referred to as "wholesale electricity market price") is relatively low during late night and daytime hours when demand is low, and relatively high during early morning and nighttime hours when demand is high. Therefore, by charging the storage battery 12 during late night and daytime hours when the wholesale electricity market price is relatively low, and discharging the storage battery 12 during early morning and nighttime hours when the wholesale electricity market price is relatively high, it is possible to improve the revenue from selling electricity (revenue from selling electricity).

[0037] The charge and discharge plan creation system 100 creates a charge and discharge plan for the storage battery 12 in order to increase the revenue from selling electricity obtained by charging and discharging the storage battery 12 as described above. As shown in FIG. 1 , the charge and discharge plan creation system 100 is configured by, for example, a cloud server. The charge and discharge plan creation system 100 includes a transmission / reception unit 21 and a processing unit 22.

[0038] The transmitter / receiver 21 transmits and receives various types of information via a network such as the Internet. For example, the transmitter / receiver 21 can receive (acquire) information (such as weather forecasts and past data on the amount of photovoltaic power generation) for predicting the amount of power generation by the photovoltaic power generation unit 11 (hereinafter also referred to as "photovoltaic power generation amount"), a final value of the wholesale electricity market price, etc. from other information processing devices, the EMS 15 of the power selling system 1, etc. The transmitter / receiver 21 can also acquire an output suppression plan, output suppression finalization information, etc. from the EMS 15. The transmitter / receiver 21 can also transmit to the EMS 15 a charge / discharge plan for the storage battery 12, which will be described later, etc.

[0039] The processing unit 22 performs various types of processing. The processing performed by the processing unit 22 includes creating a charge / discharge plan for the storage battery 12 and correcting the plan, which will be described later. The processing unit 22 creates a charge / discharge plan for the storage battery 12 based on information such as a weather forecast acquired by the transmitting / receiving unit 21 and past data on the amount of power generated by the solar power generation unit 11. For example, the processing unit 22 creates a charge / discharge plan for the storage battery 12 by 10:00 a.m. on the day before the actual supply / demand day, which is the deadline for bidding in the wholesale electricity market.

[0040] The charge / discharge plan for the storage battery 12 is created so that the storage battery 12 charges during late night or daytime hours when the wholesale electricity market price is predicted to be relatively low, and discharges during early morning or nighttime hours when the wholesale electricity market price is predicted to be relatively high. In this embodiment, the charge / discharge plan for the storage battery 12 is created so that the storage battery 12 is charged until it is fully charged every day, and discharges while leaving a minimum capacity (for example, 20% of 100% capacity).

[0041] When the processing unit 22 creates a charge / discharge plan for the storage battery 12, it transmits the created charge / discharge plan to the EMS 15 of the power selling system 1 via the transmitting / receiving unit 21. When the processing unit 22 creates a charge / discharge plan for the storage battery 12 in this way, the power generation company bids in the wholesale electricity market based on the charge / discharge plan, and the power selling system 1 charges / discharges the storage battery 12 based on the charge / discharge plan, thereby improving the revenue from selling electricity.

[0042] Here, if the amount of power generated by solar power generation (outside the power selling system 1) exceeds the power demand, the power company (general power transmission and distribution company) may request the power generation company to suppress output. Here, "output suppression" means that the power generation company suppresses the output of a solar power plant or a wind power plant at the instruction of the power company (general power transmission and distribution company). When output suppression is carried out, the power company first transmits an output suppression plan to the EMS 15 of the power selling system 1 (see Figure 1). The output suppression plan is transmitted between 4:00 and 6:00 PM on the day before the output suppression date.

[0043] Here, the "output suppression plan" refers to information about the time periods subject to output suppression and the plan for the upper limit of output (amount of electricity sold) to the electric power company (hereinafter referred to as the "output upper limit value"). The output upper limit in the output suppression plan may be indicated by a specific value or by a suppression rate (a rate relative to the maximum output of the power conditioner 13). The time periods subject to output suppression and the output upper limit value (suppression rate) in the output suppression plan may be subject to change in the future and are not set in stone.

[0044] After the output curtailment plan is distributed, if it is decided that the output curtailment request will actually be carried out, the power company distributes output curtailment confirmation information to the EMS 15 of the power selling system 1. Here, "output curtailment confirmation information" is confirmed information about the time period subject to output curtailment and the output upper limit value. The output curtailment confirmation information is distributed at least two hours before the target time period. The time period subject to output curtailment and the output upper limit value in the output curtailment confirmation information are confirmed and are not subject to change in the future. Once the output curtailment confirmation information is distributed, the power generation company must curtail output during the target time period in accordance with the contents of the output curtailment confirmation information (the time period subject to output curtailment and the output upper limit value).

[0045] As described above, the charge / discharge plan for the storage battery 12 is created by 10:00 a.m. on the day before the actual supply / demand date, which is the deadline for bidding in the wholesale electricity market. Therefore, a request for output curtailment (delivery of the output curtailment plan and output curtailment confirmation information) is made after the charge / discharge plan is created. Therefore, if a request for output curtailment is made, the charge / discharge plan needs to be revised.

[0046] Therefore, in response to a request for output suppression, the processing unit 22 executes a first plan correction control shown in Figures 2 and 3 and a second plan correction control shown in Figures 4 and 5. The first plan correction control shown in Figures 2 and 3 is for correcting the charge / discharge plan (initial plan) in response to the output suppression plan, and is executed at the time when the output suppression plan is scheduled to be received. Furthermore, the second plan correction control shown in Figures 4 and 5 is for correcting the charge / discharge plan (plan obtained by correcting the initial plan) in response to output suppression confirmation information, and is executed at the time when the output suppression confirmation information is scheduled to be received.

[0047] First, a method for correcting a charge / discharge plan in accordance with an output suppression plan will be described below with reference to the flowcharts shown in FIGS.

[0048] In the following, the charge / discharge plan created before bidding in the wholesale electricity market will be referred to as the “initial plan.” In this embodiment, the initial plan is created so that, for example, the storage battery 12 operates in the charge mode during the daytime to charge the maximum amount of power, and the storage battery 12 operates in the discharge mode during the nighttime to discharge the maximum amount of power.

[0049] In the following, of the 48 frames obtained by dividing a day into 30-minute intervals, a frame in which the charging mode is set is referred to as a "charging frame." Furthermore, of the 48 frames, a frame within a time period subject to output suppression in the output suppression plan is referred to as a "suppression frame." Furthermore, a target day for output suppression is referred to as the "current day," and the day before the target day for output suppression is referred to as the "previous day." The first plan revision control shown in Figures 2 and 3 is repeatedly executed during the time when the output suppression plan is scheduled to be distributed (4:00 PM to 6:00 PM on the previous day). Furthermore, the first plan revision control shown in Figures 2 and 3 may be repeatedly executed at all times.

[0050] In step S11, the processing unit 22 determines whether the output suppression plan has been distributed. As described above, the output suppression plan includes information about the target time period for output suppression and the plan for the upper limit of output (suppression rate). In this embodiment, the target time period for output suppression in the output suppression plan is set to the time period from 10:00 to 14:00 on the current day. In this embodiment, the upper limit of output is indicated by the suppression rate (for example, 70%) and is set to, for example, 350 kWh.

[0051] If the processing unit 22 determines that the output reduction plan has been distributed ("YES" in step S11), the processing proceeds to step S12. On the other hand, if the processing unit 22 determines that the output reduction plan has not been distributed ("NO" in step S11), the first plan correction control is terminated.

[0052] If there are multiple suppression frames (frames in the time zones subject to output suppression in the output suppression plan), when the processing unit 22 moves from step S11 to step S12, it repeats the processing from step S12 to step S14 the number of times as many as the number of suppression frames. For example, the processing unit 22 repeats the processing from step S12 to step S14 in order of the suppression frames in the earliest time zone among the multiple suppression frames. Hereinafter, the suppression frame that is the target of each process from step S12 to step S14 will be referred to as the "relevant suppression frame."

[0053] In step S12, the processing unit 22 determines whether the estimated output value is equal to or greater than the upper output limit value for the corresponding suppression unit. In this embodiment, the "estimated output value" refers to an estimated value of the amount of output from the inverter 13 for the corresponding suppression unit to the grid power source S. The estimated output value is calculated using the following equation 1.

[0054] Estimated output value = {Forecasted solar power generation amount in the curtailment frame / (30 min / 60 min)} × Fluctuation range correction (Equation 1)

[0055] Here, the "fluctuation range correction" is a coefficient that is set in consideration of fluctuations in the predicted value of the amount of photovoltaic power generation, and is set to, for example, "1.2."

[0056] Furthermore, in the output suppression plan, for example, when the upper limit of output is expressed as a suppression rate, the output upper limit value is calculated using the following Equation 2. In this embodiment, it is assumed that the output upper limit value is set to 350 [kWh] as described above.

[0057] Output upper limit = Maximum output of power conditioner 13 × Suppression rate (Equation 2)

[0058] If the processing unit 22 determines that the output estimate value is equal to or greater than the output upper limit value ("YES" in step S12), the processing proceeds to step S13. On the other hand, if the processing unit 22 determines that the output estimate value is not equal to or greater than the output upper limit value ("NO" in step S12), the processing proceeds to step S15 shown in FIG.

[0059] If the estimated output value is greater than or equal to the upper output limit (YES in step S12), this means that in the initial plan for the suppression block, the output value from the solar power generation unit 11 (power conditioner 13) to the grid power source S is likely to exceed the upper output limit, and output suppression is necessary. On the other hand, if the estimated output value is not greater than or equal to the upper output limit (NO in step S12), this means that in the suppression block, the output value from the solar power generation unit 11 (power conditioner 13) to the grid power source S is unlikely to exceed the upper output limit, even if the initial plan remains unchanged, and output suppression is not necessary.

[0060] In step S13, the processing unit 22 determines whether the suppressed frame is a charging frame. Here, a "charging frame" refers to a frame in which the charging mode of the storage battery 12 is set as described above.

[0061] If the processing unit 22 determines that the suppression frame is a charging frame (YES in step S13), the processing unit 22 proceeds to step S15 shown in Fig. 3. On the other hand, if the processing unit 22 determines that the suppression frame is not a charging frame (NO in step S13), the processing unit 22 proceeds to step S14.

[0062] In step S14, the processing unit 22 sets the corresponding restriction frame as a charging frame. Specifically, the processing unit 22 modifies the initial plan so that the mode of the storage battery 12 set in the restriction frame where the estimated output value is equal to or greater than the upper output limit value is switched from the standby mode to the charging mode. At this time, the processing unit 22 also modifies the initial plan so that the amount of power to be charged to the storage battery 12 corresponds to the difference between the estimated output value and the upper output limit value in the restriction frame. In this way, for example, if the amount of power corresponding to the difference between the estimated output value and the upper output limit value is equal to or less than the maximum charge amount of the storage battery 12 and the storage battery 12 is not fully charged, the requested output suppression can be achieved in the restriction frame.

[0063] When the processing unit 22 has completed the processes from step S12 to step S14 for all the suppressed frames, the process proceeds to step S15 shown in FIG.

[0064] In step S15, the processing unit 22 determines whether the storage battery 12 will be fully charged by the end of all the suppression frames (target time periods) in the revised charge / discharge plan, which has been repeated from step S12 to step S14 the number of suppression frames. Specifically, for example, if the suppression frame is set to a charge frame in step S14, the remaining amount of stored power of the storage battery 12 in the suppression frame will increase. As a result, in the revised charge / discharge plan, the planned value of the remaining amount of stored power of the storage battery 12 may become 100% or more of its capacity by the end of the suppression frame, and the requested output suppression may not be achieved. Therefore, the processing unit 22 determines whether the storage battery 12 will be fully charged by the end of all the suppression frames (target time periods) in the revised charge / discharge plan.

[0065] If the processing unit 22 determines that the storage battery 12 will be fully charged by the end of the suppression frame ("YES" in step S15), the processing proceeds to step S16. On the other hand, if the processing unit 22 determines that the storage battery 12 will not be fully charged by the end of the suppression frame ("NO" in step S15), the processing proceeds to step S20.

[0066] If the storage battery 12 is fully charged by the end of the suppression frame (YES in step S15), it means that there is (highly likely to be) insufficient free capacity in the storage battery 12 for output suppression in the suppression frame. On the other hand, if the storage battery 12 is not fully charged by the end of the suppression frame (NO in step S15), it means that there is (highly likely to be) sufficient free capacity in the storage battery 12 for output suppression in the suppression frame.

[0067] In step S16, the processing unit 22 distributes the charge amount to the restriction frames. That is, the processing unit 22 sets the planned value of the charge amount of the storage battery 12 in the restriction frame (predicted excess frame) for which the result of step S12 is YES as the excess of the amount of power sold relative to the output upper limit, and subtracts the planned value of the charge amount of the storage battery 12 in frame times other than the predicted excess frame by the excess amount. More specifically, the processing unit 22 first calculates the difference between the total charge amount in the frame time subject to output restriction and the amount of power required for full charge in the corrected charge / discharge plan (after processing in step S14). This difference in power amount indicates the amount of power (surplus power amount) that cannot be charged to the storage battery 12 and cannot respond to the request for output restriction. Therefore, the processing unit 22 appropriately reduces the charge amount for the charging frame in the initial plan within a range that does not affect the output restriction, and corrects the initial plan so that the surplus power amount can be charged to the storage battery 12.

[0068] That is, the processing unit 22 reduces the charge amount in the initial plan, starting with the latest charging frame and moving to the earliest charging frame, within a range that does not affect output suppression. For example, if the charging frame for which the charge amount is to be reduced is in a time period other than the time period subject to output suppression, the mode of the storage battery 12 is changed from charging mode to standby mode (the charge amount is set to 0). Also, for example, if the charging frame for which the charge amount is to be reduced is in a time period (restriction frame) within the time period subject to output suppression, the charge amount is reduced within a range that does not cause the output value (output plan value) from the photovoltaic power generation unit 11 to the grid power source S to exceed the output upper limit due to the reduction in the charge amount. In this way, the processing unit 22 modifies the initial plan so as not to affect output suppression, and distributes the charge capacity limit to the restriction frames.

[0069] After performing the process of step S16, the processing unit 22 proceeds to step S17.

[0070] In step S17, the processing unit 22 determines whether or not the estimated excess amount in each suppression frame is greater than 0. Here, the "estimated excess amount" indicates the estimated value of the excess amount of the output plan value relative to the output upper limit value.

[0071] If the processing unit 22 determines that the expected excess amount is greater than 0 (YES in step S17), the processing unit 22 proceeds to step S18. On the other hand, if the processing unit 22 determines that the expected excess amount is not greater than 0 (NO in step S17), the processing unit 22 proceeds to step S20.

[0072] Note that if the expected excess amount is not greater than 0 (NO in step S17), it means that the output plan value does not exceed the output upper limit value in all the suppression blocks in the charge / discharge plan after the processing in step S16 (the request for output suppression can be met). On the other hand, if the expected excess amount is greater than 0 (YES in step S17), it means that there are still suppression blocks in the charge / discharge plan after the processing in step S16 where the output plan value exceeds the output upper limit value (the request for output suppression cannot be met).

[0073] In step S18, the processing unit 22 determines whether or not it is possible to reduce the expected excess amount by adjusting the amount of discharge from the storage battery 12. Specifically, if there is a frame in which the storage battery 12 is in a charged state (the remaining amount of stored power in the storage battery 12 is not 0) before the charging frame in the target time slot for output suppression, the processing unit 22 determines that it is possible to reduce the expected excess amount by adjusting the amount of discharge from the storage battery 12. On the other hand, if there is no frame in which the storage battery 12 is in a charged state before the charging frame in the target time slot for output suppression, the processing unit 22 determines that it is not possible to reduce the expected excess amount by adjusting the amount of discharge from the storage battery 12.

[0074] If the processing unit 22 determines that the expected excess amount can be reduced by adjusting the amount of discharge from the storage battery 12 ("YES" in step S18), the processing unit 22 proceeds to step S19. On the other hand, if the processing unit 22 determines that the expected excess amount cannot be reduced by adjusting the amount of discharge from the storage battery 12 ("NO" in step S18), the processing unit 22 proceeds to step S20.

[0075] In step S19, the processing unit 22 increases the amount of discharge from the storage battery 12, for example, by changing the mode of the storage battery 12 from standby mode to discharge mode in a frame that precedes the charging frame in the time period subject to output suppression and in which the storage battery 12 has remaining power, within the time period until the end of the suppression frame. The frame for increasing the amount of discharge is selected based on the predicted value of the imbalance charge unit price (the unit price of the charge incurred for the difference between the planned and actual amount of power supply). The predicted value of the imbalance charge unit price is calculated based on the confirmed value of the wholesale electricity market unit price, data on past imbalance charge unit prices, etc.

[0076] The processing unit 22 increases the amount of discharge from the storage battery 12 by the expected excess amount (adds discharge) in a frame with the lowest predicted value of the imbalance charge unit price among frames that precede the charging frame in the target time period for output suppression (for example, a frame between midnight and the suppression frame on the day) and in which the storage battery 12 has remaining power. If it is necessary to increase the amount of discharge in multiple frames, the increase in the amount of discharge is performed in order from the frame with the lowest predicted value of the imbalance charge unit price. In this way, by increasing the amount of discharge in a frame with the lowest predicted value of the imbalance charge unit price, the imbalance charge associated with the increase in the amount of discharge can be reduced.

[0077] Furthermore, the frame in which the amount of discharge is increased (addition of discharge) may be selected based on the predicted value of the wholesale electricity market price. For example, the processing unit 22 may increase the amount of discharge from the storage battery 12 (addition of discharge) by the amount of the expected excess amount in frames in which the predicted value of the wholesale electricity market price is high (starting from the highest) among frames in which the storage battery 12 has remaining power storage capacity that are before the charging frame in the time slot subject to output suppression (for example, frames between midnight on the day and the suppression frame). In this way, by increasing the amount of discharge in frames in which the predicted value of the wholesale electricity market price is high, it is possible to increase the revenue from selling electricity as the amount of discharge increases.

[0078] In this way, in step S19, by increasing the amount of discharge from the storage battery 12 in a time slot before the charging frame in the time slot subject to output suppression, it is possible to secure the available capacity (charging frame) of the storage battery 12. Note that the frame for increasing the amount of discharge may be selected taking into consideration both the predicted value of the imbalance charge unit price and the predicted value of the wholesale electricity market price.

[0079] After performing the process of step S19, the processing unit 22 proceeds to step S20.

[0080] In step S20, the processing unit 22 determines whether the remaining amount of electricity stored in the storage battery 12 in the frame after the suppression frame is appropriate or not. The processing in step S20 will be specifically described below.

[0081] Generally, the wholesale electricity market price is relatively higher during the nighttime hours (e.g., 6:00 PM to 8:00 PM) after the curtailment period (e.g., 10:00 PM to 2:00 PM). Therefore, the more the amount of electricity discharged from the storage battery 12 during the nighttime, the greater the revenue from selling electricity. Therefore, in order to increase the revenue from selling electricity, it is desirable to maximize the remaining amount of electricity stored in the storage battery 12 before nighttime. For this reason, the initial plan is to, for example, fully charge the remaining amount of electricity stored in the storage battery 12 (100% of capacity) just before nighttime when the wholesale electricity market price is high.

[0082] However, by modifying the initial plan in accordance with the output suppression plan, in the modified charge / discharge plan, the planned value of the remaining storage amount of the storage battery 12 immediately before nighttime (scheduled time for discharging from the storage battery 12) may be excessive or insufficient compared to the planned value in the initial plan (e.g., 100% of capacity). If the planned value of the remaining storage amount in the modified charge / discharge plan is excessive compared to the planned value of the remaining storage amount in the initial plan (e.g., 100% of capacity), some power may not actually be charged. On the other hand, if the planned value of the remaining storage amount in the modified charge / discharge plan is insufficient compared to the planned value of the remaining storage amount in the initial plan (e.g., 100% of capacity), revenue from selling electricity will decrease. Therefore, in step S20, the processing unit 22 determines whether the planned value of the remaining storage amount of the storage battery 12 in the frame immediately before nighttime (scheduled time for discharging from the storage battery 12) after the suppression frame in the modified charge / discharge plan is excessive or insufficient compared to the planned value of the remaining storage amount in the initial plan.

[0083] When the processing unit 22 determines that the remaining amount of stored power of the storage battery 12 in the frame that is (just before) the scheduled discharge time after the suppression frame is not appropriate (excessive or insufficient) ("YES" in step S20), the processing unit 22 proceeds to step S21. On the other hand, when the processing unit 22 determines that the remaining amount of stored power of the storage battery 12 in the frame that is (just before) the scheduled discharge time after the suppression frame is appropriate (neither excessive nor insufficient) ("NO" in step S20), the processing unit 22 ends the first plan correction control. Note that the criterion (threshold value) for determining whether the remaining amount of stored power is appropriate is not limited to the planned value of the remaining amount of stored power in the initial plan, and may be a predetermined range including the planned value of the remaining amount of stored power in the initial plan (for example, the planned value ±10%).

[0084] In step S21, the processing unit 22 adjusts the charge amount for the frame after the suppressed frame.

[0085] Specifically, if the remaining amount of stored electricity in the storage battery 12 is excessive in a frame that is after the suppression frame and that is (just before) the scheduled discharge time, the processing unit 22 reduces the amount of charge in the storage battery 12 or increases the amount of discharge in the storage battery 12 (adds discharge) in the frame that has the lowest predicted value of the imbalance fee unit price among the frames that are after the suppression frame and before the scheduled discharge time. If it is necessary to reduce charge or increase discharge in multiple frames, the reduction in charge or increase in discharge is performed in order starting from the frame with the lowest predicted value of the imbalance fee unit price.

[0086] On the other hand, if the remaining amount of stored electricity in the storage battery 12 is insufficient in the frame that is (just before) the scheduled discharge time after the suppression frame, the processing unit 22 increases the charge amount of the storage battery 12 or decreases the discharge amount of the storage battery 12 in the frame that has the lowest predicted value of the imbalance fee unit price among the frames that are after the suppression frame and before the scheduled discharge time (in order from lowest to highest). However, if economic loss can be reduced by leaving the discharge amount for the scheduled discharge time less than the planned value because the predicted value of the imbalance fee unit price for the frame that increases the charge amount or decreases the discharge amount of the storage battery 12 is lower than the predicted value of the imbalance fee unit price for the scheduled discharge time (nighttime), the discharge amount for the scheduled discharge time may be left less than the planned value.

[0087] After performing the process of step S21, the processing unit 22 ends the plan correction control.

[0088] As described above, by executing the first plan correction control shown in Figures 2 and 3, it is possible to correct the charge / discharge plan of the storage battery 12 in accordance with the output suppression plan. However, as described above, the contents of the output suppression plan (the time period subject to output suppression and the upper output limit value) are subject to change and are determined by the output suppression determination information. Furthermore, if the output suppression determination information is not distributed, output suppression will not be implemented.

[0089] A method for correcting a charge / discharge plan in response to output suppression determination information will be described below using the flowcharts shown in Figures 4 and 5. The second plan correction control shown in Figures 4 and 5 corrects the charge / discharge plan in response to output suppression determination information, based on the charge / discharge plan corrected by the first plan correction control shown in Figures 2 and 3. The second plan correction control shown in Figures 4 and 5 is started two hours before each suppression block in the output suppression plan.

[0090] In the second plan correction control shown in Figures 4 and 5, if there are changes in the target time period and the output upper limit value from the output suppression plan, the corrected charge / discharge plan (hereinafter referred to as the "temporary corrected charge / discharge plan") is corrected by the first plan correction control shown in Figures 2 and 3. On the other hand, if there are no changes in the target time period and the output upper limit value from the output suppression plan, the temporary corrected charge / discharge plan is not corrected.

[0091] The processes from steps S31 to S41 in FIGS. 4 and 5 correspond to the processes from steps S11 to S21 in FIGS. 2 and 3, respectively.

[0092] In step S31, the processing unit 22 determines whether output suppression confirmation information has been distributed for the suppression frame in the output suppression plan. As described above, the output suppression confirmation information includes confirmation information on the target time period for output suppression and the output upper limit value (suppression rate). Note that the target time period and output upper limit value in the output suppression confirmation information may be the same as the target time period and output upper limit value in the output suppression plan (temporary corrected charge / discharge plan), or may have been changed from the target time period and output upper limit value in the output suppression plan. For example, the target time period in the output suppression confirmation information may have been changed from 10:00 to 14:00 to 11:00 to 14:00.

[0093] If the processing unit 22 determines that the output suppression confirmation information has been distributed ("YES" in step S31), the processing unit 22 proceeds to step S32. On the other hand, if the processing unit 22 determines that the output suppression confirmation information has not been distributed ("NO" in step S31), the processing unit 22 proceeds to step S42.

[0094] If the output suppression confirmation information indicates that there are multiple suppressed frames, the processing unit 22, upon transitioning from step S31 to step S32, repeats the processes from step S32 to step S34 the number of times equal to the number of suppressed frames. For example, the processing unit 22 repeats the processes from step S32 to step S34 in order of suppressed frames in the earliest time slot among the multiple suppressed frames. Hereinafter, the suppressed frame that is the target of each process from step S32 to step S34 will be referred to as the "relevant suppressed frame."

[0095] In step S32, the processing unit 22 determines whether the estimated output value is equal to or greater than the upper output limit value for the suppression frame. The method of calculating the estimated output value and the upper output limit value is the same as in step S12 of FIG.

[0096] If the processing unit 22 determines that the output estimate value is equal to or greater than the output upper limit value (YES in step S32), the processing proceeds to step S33. On the other hand, if the processing unit 22 determines that the output estimate value is not equal to or greater than the output upper limit value (NO in step S32), the processing proceeds to step S35 shown in FIG.

[0097] In step S33, the processing unit 22 determines whether the suppression frame is a charging frame. If the processing unit 22 determines that the suppression frame is a charging frame (YES in step S33), the processing unit 22 proceeds to step S35 shown in Fig. 5. On the other hand, if the processing unit 22 determines that the suppression frame is not a charging frame (NO in step S33), the processing unit 22 proceeds to step S34.

[0098] In step S34, the processing unit 22 sets the corresponding restriction frame to a charging frame. Specifically, the processing unit 22 modifies the initial plan so that the mode of the storage battery 12 set in the restriction frame where the output estimate value is equal to or greater than the output upper limit value is switched from the standby mode to the charging mode. At this time, the processing unit 22 also modifies the initial plan so that the amount of power charged by the storage battery 12 corresponds to the difference between the output estimate value and the output upper limit value.

[0099] When the processing unit 22 has completed the processes from step S32 to step S34 for all the suppressed frames, the process proceeds to step S35 shown in FIG.

[0100] In step S35, the processing unit 22 determines whether the storage battery 12 will be fully charged by the end of all the suppression frames (target time periods) in the revised charge / discharge plan (relative to the provisional revised charge / discharge plan) from step S32 to step S34, which have been repeated the number of suppression frames.

[0101] If the processing unit 22 determines that the storage battery 12 will be fully charged by the end of the suppression frame ("YES" in step S35), the processing proceeds to step S36. On the other hand, if the processing unit 22 determines that the storage battery 12 will not be fully charged by the end of the suppression frame ("NO" in step S35), the processing proceeds to step S40.

[0102] In step S36, the processing unit 22 distributes the charge amount to the restriction blocks. That is, the processing unit 22 modifies the temporary modified charge / discharge plan within a range that does not affect output restriction, and distributes the charge capacity to the restriction blocks. After performing the process of step S36, the processing unit 22 proceeds to step S37.

[0103] In step S37, the processing unit 22 determines whether the expected excess amount is greater than 0 for each suppression frame. If the processing unit 22 determines that the expected excess amount is greater than 0 (YES in step S37), the processing unit 22 proceeds to step S38. On the other hand, if the processing unit 22 determines that the expected excess amount is not greater than 0 (NO in step S37), the processing unit 22 proceeds to step S40.

[0104] In step S38, the processing unit 22 determines whether or not it is possible to reduce the expected excess amount by adjusting the amount of discharge from the storage battery 12. If the processing unit 22 determines that it is possible to reduce the expected excess amount by adjusting the amount of discharge from the storage battery 12 ("YES" in step S38), the processing unit 22 proceeds to step S39. On the other hand, if the processing unit 22 determines that it is not possible to reduce the expected excess amount by adjusting the amount of discharge from the storage battery 12 ("NO" in step S38), the processing unit 22 proceeds to step S40.

[0105] In step S39, the processing unit 22 increases the amount of discharge from the storage battery 12, for example, by changing the mode of the storage battery 12 from standby mode to discharge mode in a frame that precedes the charging frame in the time period subject to output suppression and in which the storage battery 12 has remaining power, within the time period until the end of the suppression frame. Also, as in step S19, the frame in which the amount of discharge is increased is selected based on the predicted value of the imbalance charge unit price and / or the predicted value of the wholesale electricity market price. In this way, by increasing the amount of discharge from the storage battery 12 in a frame that precedes the suppression frame, it is possible to ensure available capacity (charging frame) of the storage battery 12.

[0106] After performing the process of step S39, the processing unit 22 proceeds to step S40.

[0107] In step S40, the processing unit 22 determines whether the remaining amount of stored power of the storage battery 12 in the frame after the suppression frame is inappropriate. If the processing unit 22 determines that the remaining amount of stored power of the storage battery 12 in the frame that is (just before) the scheduled discharge time after the suppression frame is inappropriate (excessive or insufficient) (“YES” in step S40), the processing unit 22 proceeds to step S41. On the other hand, if the processing unit 22 determines that the remaining amount of stored power of the storage battery 12 in the frame that is (just before) the scheduled discharge time after the suppression frame is appropriate (neither excessive nor insufficient) (“NO” in step S40), the second plan correction control is terminated.

[0108] In step S41, the processing unit 22 adjusts the charge amount in the frame after the suppression frame. Specifically, if the remaining amount of stored power in the storage battery 12 is excessive in the frame that is after the suppression frame and is (just before) the scheduled discharge time, the processing unit 22 reduces the charge amount of the storage battery 12 or increases the discharge amount of the storage battery 12 in the frame that is after the suppression frame and is before the scheduled discharge time and has the lowest predicted value of the imbalance fee unit price (in order from lowest to highest). On the other hand, if the remaining amount of stored power in the storage battery 12 is insufficient in the frame that is after the suppression frame and is before the scheduled discharge time and is (just before) the scheduled discharge time, the processing unit 22 increases the charge amount of the storage battery 12 or decreases the discharge amount of the storage battery 12 in the frame that is after the suppression frame and is before the scheduled discharge time and has the lowest predicted value of the imbalance fee unit price (in order from lowest to highest).

[0109] After performing the process of step S41, the processing unit 22 ends the second plan correction control.

[0110] On the other hand, if the target time period in the output reduction confirmation information is changed from 10:00 to 14:00 to 11:00 to 14:00, the output reduction confirmation information will not be distributed for the reduction frame at 10:00 (10:00 to 10:30) and the reduction frame at 10:30 (10:30 to 11:00) (NO in step S31 of FIG. 4). In this case, the processing unit 22 proceeds to step S42.

[0111] In step S42, the processing unit 22 returns the charge / discharge schedule (planned value of charge or discharge amount) of the storage battery 12 in the corresponding frame (the suppression frame for which it is determined that the output suppression confirmation information has not been distributed in step S31) to the initially planned charge / discharge schedule (planned value of charge or discharge amount). This makes it possible to suppress the occurrence of imbalance.

[0112] After performing the process of step S42, the processing unit 22 proceeds to step S43.

[0113] In step S43, the processing unit 22 determines whether the remaining amount of stored power of the storage battery 12 in the frame after the suppression frame is inappropriate. If the processing unit 22 determines that the remaining amount of stored power of the storage battery 12 in the frame that is (just before) the scheduled discharge time after the suppression frame is inappropriate (excessive or insufficient) (“YES” in step S43), the processing unit 22 proceeds to step S44. On the other hand, if the processing unit 22 determines that the remaining amount of stored power of the storage battery 12 in the frame that is (just before) the scheduled discharge time after the suppression frame is appropriate (neither excessive nor insufficient) (“NO” in step S43), the second plan correction control is terminated.

[0114] In step S44, the processing unit 22 adjusts the charge amount in the frame after the suppression frame. Specifically, if the remaining amount of stored power in the storage battery 12 is excessive in the frame that is after the suppression frame and is (just before) the scheduled discharge time, the processing unit 22 reduces the charge amount of the storage battery 12 or increases the discharge amount of the storage battery 12 in the frame that is after the suppression frame and is before the scheduled discharge time and has the lowest predicted value of the imbalance fee unit price (in order from lowest to highest). On the other hand, if the remaining amount of stored power in the storage battery 12 is insufficient in the frame that is after the suppression frame and is before the scheduled discharge time and is has the lowest predicted value of the imbalance fee unit price (in order from lowest to highest), the processing unit 22 increases the charge amount of the storage battery 12 or decreases the discharge amount of the storage battery 12 in the frame that is after the suppression frame and is before the scheduled discharge time and has the lowest predicted value of the imbalance fee unit price (in order from lowest to highest).

[0115] After performing the process of step S41, the processing unit 22 ends the second plan correction control.

[0116] Fig. 6(a) is a graph showing an example of the change in the amount of power in the initial plan over one day, Fig. 6(b) is a graph showing an example of the state of the amount of power when the processing of step S14 of the first plan correction control is performed, and Fig. 7 is a graph showing an example of the change in the amount of power in the charge / discharge plan over one day after correction by the first plan correction control. As shown in Fig. 6(a), from 10:00 to 11:30 (from the 10:00 to 11:00 frames), the amount of photovoltaic power generation exceeds the output upper limit (350 [kWh]) (YES in step S12 of Fig. 2).

[0117] Therefore, as shown in Fig. 6(b), the storage battery 12 is switched to the charging mode from 10:00 to 11:30, and the initial plan is modified so that the amount of power charged by the storage battery 12 corresponds to the difference between the estimated output value and the output upper limit value (step S14 in Fig. 2). However, because the charging from 10:00 to 11:30 by this process will cause the storage battery 12 to be fully charged by the end of the suppression period (10:00 to 14:00) (YES in step S15 in Fig. 3), the amount of charge in other time periods (e.g., 12:30 to 14:00) is shifted to 10:00 to 11:30, as shown in Fig. 7. That is, the amount of charge from 12:30 to 14:00 is reduced, and the amount of charge to the storage battery 12 from 10:00 to 11:30 is set to the excess of the amount of power generated relative to the output upper limit value (step S16 in Fig. 3). In this way, by shifting the charge amount of the storage battery 12, it is possible to prevent the storage battery 12 from becoming fully charged by 2 pm, and also to prevent the amount of electricity sold from exceeding the output upper limit value.

[0118] Fig. 8(a) is a graph showing an example of the change in the amount of power in one day in the charge / discharge plan before correction by the second plan correction control, and Fig. 8(b) is a graph showing an example of the change in the amount of power in one day in the charge / discharge plan after correction by the second plan correction control. As shown in Fig. 8(a) and Fig. 8(b), if the time period from 10:00 to 11:00 is not included in the time period subject to output suppression (NO in step S31 of Fig. 4), the increase in the amount of charge in the storage battery 12 from 10:00 to 11:00 is shifted to the original time period (for example, 1:00 to 2:00 pm). This makes it possible to suppress the occurrence of imbalance charges.

[0119] As described above, in the charge / discharge plan creation system 100 according to this embodiment, when an output suppression plan is received, the charge / discharge plan (initial plan) is corrected in accordance with the output suppression plan. Then, when output suppression determination information is received, the charge / discharge plan corrected in accordance with the output suppression plan (temporary corrected charge / discharge plan) is corrected in accordance with the output suppression determination information. This improves the degree of freedom in correcting the charge / discharge plan of the storage battery 12.

[0120] Specifically, in order to charge the storage battery 12 with power from the photovoltaic power generation unit 11 during a time period subject to output suppression, it is necessary to free up the capacity (charging frame) of the storage battery 12 before the time period subject to output suppression. However, after receiving the output suppression confirmation information (immediately before the time period subject to output suppression), there is little time to free up the capacity of the storage battery 12 (time to increase the discharge amount or decrease the charge amount of the storage battery 12). Therefore, it may not be possible to sufficiently free up the capacity (charging frame) of the storage battery 12 before the time period subject to output suppression, and it may not be possible to respond to the request for output suppression without wasting power from the photovoltaic power generation unit 11.

[0121] On the other hand, in the charge / discharge plan creation system 100 according to this embodiment, the time for freeing up the capacity of the storage battery 12 (the time for increasing the discharge amount or decreasing the charge amount of the storage battery 12) is set at the time when the output suppression plan is received (4:00 PM to 6:00 PM on the previous day). Therefore, it is possible to respond to the request for output suppression without wasting the power from the solar power generation unit 11.

[0122] Furthermore, even if the storage battery 12 is discharged after receiving the output suppression confirmation information (just before the time period during which output suppression is targeted) in order to free up capacity in the storage battery 12, if the wholesale electricity market price during the time period during which the electricity is discharged is low or if the imbalance charge price due to an increase in the amount of discharge is high, it will not be possible to obtain sufficient revenue from selling electricity.

[0123] On the other hand, in the charge / discharge plan creation system 100 according to this embodiment, when receiving the output suppression plan, the discharge time period can be set to a time period that is advantageous in terms of revenue from selling electricity (for example, a time period when the wholesale electricity market unit price is high or a time period when the imbalance charge unit price is low) in order to free up capacity in the storage battery 12. This makes it possible to increase revenue from selling electricity while responding to requests for output suppression.

[0124] Then, when the output curtailment confirmation information is received, the charge / discharge plan (provisionally revised charge / discharge plan) is revised in accordance with the output curtailment plan, and corrections are made in accordance with the output curtailment confirmation information, so that requests for output curtailment can be easily accommodated even if the time period subject to output curtailment and the upper output limit value are changed.

[0125] As described above, the charge and discharge plan creation system 100 according to this embodiment: A charge / discharge plan creation system 100 for creating a charge / discharge plan for the storage battery 12 in a power selling system 1 that has a solar power generation unit 11 (power generation unit) that can generate power using natural energy and a storage battery 12 that can charge and discharge power from the solar power generation unit 11 and can sell power from the solar power generation unit 11, a charge / discharge plan creation unit (processing unit 22) that creates the charge / discharge plan based on a predicted value of the power generation amount of the solar power generation unit 11 and a predicted value of the wholesale electricity market price; a first plan correction unit (processing unit 22) that corrects the charge / discharge plan when an output suppression plan including a target time period (suppression frame) for output suppression and a plan for an output upper limit value is distributed, based on the output suppression plan, by setting an excess predicted time period (suppression frame for which YES is determined in step S12 of FIG. 2) in which the amount of power sold by the power selling system 1 during the target time period is predicted to exceed the output upper limit value as a planned charging time period (charging frame) in which the storage battery 12 is charged so that the amount of power sold does not exceed the output upper limit value (step S14 of FIG. 2); When output suppression determination information including the target time period (suppression frame) of output suppression and the determination information of the output upper limit value is distributed after the output suppression plan (YES in step S31 of FIG. 4), a second plan correction unit (processing unit 22) re-corrects the charge / discharge plan based on the output suppression determination information (steps S32 of FIG. 4 to S41 of FIG. 5), It is equipped with the following.

[0126] Such a configuration makes it easier to respond to requests for output suppression.

[0127] Further, the first plan correction unit As a result of setting the predicted excess time period as the planned charging time period (step S14 in Figure 2), if it is predicted that the storage battery 12 will be fully charged by the end of the target time period (YES in step S15 in Figure 3), the planned value of the charge amount of the storage battery 12 during the predicted excess time period is set to the excess of the amount of electricity sold over the output upper limit value, and the planned value of the charge amount of the storage battery 12 during time periods other than the predicted excess time period is subtracted by the excess amount (step S16 in Figure 3).

[0128] With this configuration, it is possible to free up capacity (charging limit) of the storage battery 12 for output suppression.

[0129] Further, the first plan correction unit As a result of setting the predicted excess time period as the planned charging time period (step S14 in Figure 2), if it is predicted that the storage battery will be fully charged by the end of the target time period (YES in step S15 in Figure 3), the planned value of the discharge amount from the storage battery 12 in the time period before the predicted excess time period can be increased (step S19 in Figure 3).

[0130] With this configuration, it is possible to free up capacity (charging limit) of the storage battery 12 for output suppression.

[0131] Further, the first plan correction unit The time period during which the planned value of the discharge amount from the storage battery 12 is increased can be selected based on the time period during which the predicted value of the imbalance charge unit price is low or the predicted value of the wholesale electricity market unit price (step S19 in Figure 3).

[0132] With this configuration, it is possible to suppress a decrease in revenue from selling electricity.

[0133] Further, the first plan correction unit If, as a result of setting the predicted excess time period as the planned charging time period, the remaining amount of stored power of the storage battery 12 exceeds a planned value during the planned discharging time period in which the storage battery 12 is discharged (YES in step S20 of FIG. 3), it is possible to increase the amount of discharge of the storage battery 12 during a time period before the planned discharging time period, or to decrease the amount of charge of the storage battery (step S21 of FIG. 3), A time period during which the amount of discharge of the storage battery 12 is increased or the amount of charge of the storage battery 12 is decreased can be selected based on the predicted value of the imbalance charge unit price (step S21 in FIG. 3).

[0134] With this configuration, it is possible to suppress a decrease in revenue from selling electricity.

[0135] Further, the first plan correction unit If, as a result of setting the predicted excess time period as the planned charging time period, the remaining amount of stored power of the storage battery 12 is insufficient for the planned value during the planned discharging time period in which the storage battery 12 is discharged (YES in step S20 of FIG. 3), it is possible to reduce the amount of discharge of the storage battery 12 during the time period before the planned discharging time period, or to increase the amount of charge of the storage battery (step S21 of FIG. 3), A time period during which the amount of discharge from the storage battery 12 is reduced or the amount of charge from the storage battery 12 is increased can be selected based on the predicted value of the imbalance charge unit price (step S21 in FIG. 3).

[0136] With this configuration, it is possible to suppress a decrease in revenue from selling electricity.

[0137] Further, the second plan correction unit It is possible to restore the planned value of the charge or discharge amount of the storage battery 12 during the time period that is no longer subject to output suppression among the target time periods in the output suppression plan to the planned value of the charge or discharge amount of the storage battery 12 in the charge / discharge plan before it was corrected by the first plan correction unit (step S42 in Figure 4).

[0138] With this configuration, it is possible to suppress the occurrence of imbalance.

[0139] 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.

[0140] For example, the inverter 13 may also serve as the EMS 15. In this manner, the configuration of the EMS 15 is not limited. In addition, although the present embodiment is configured such that one inverter 13 is provided on the distribution line L1, the present invention is not limited to this. Specifically, instead of or in addition to the inverter 13, an inverter may be provided for the solar power generation unit 11 or the storage battery 12, and the EMS 15 may be connected to the inverter for the solar power generation unit 11 or the storage battery 12. In this manner, some or all of the functions of the inverter 13 according to this embodiment may be provided in the inverter for the solar power generation unit 11 or the storage battery 12. In this manner, the present invention is not particularly limited to the locations (for example, distribution lines or devices) or the number of inverters provided.

[0141] In addition, in the present embodiment, the charge / discharge plan creation system 100 is configured separately from the power selling system 1, but is not limited to this. That is, the charge / discharge plan creation system 100 may include the power selling system 1 (a system that includes the devices, etc., included in the power selling system 1 as components). Furthermore, the charge / discharge plan creation system 100 is not limited to a server executed on the cloud, and may be configured, for example, by a computer that executes a program, or by a dedicated device configured with a dedicated circuit.

[0142] Furthermore, in this embodiment, the power selling system 1 is configured to include the solar power generation unit 11 as the power generation unit, but is not limited to a solar power generation unit, and may be any unit that can generate power using natural energy.

[0143] 2 and 3 and the second plan correction control shown in Fig. 4 and 5 can be modified as appropriate. For example, in step S14, the processing unit 22 switches the set mode of the storage battery 12 from the standby mode to the charging mode and modifies the initial plan so that the amount of power charged to the storage battery 12 corresponds to the difference between the output estimate value and the output upper limit value in the suppression frame. However, the amount of power charged to the storage battery 12 may be set to the maximum charge amount. Furthermore, if the storage battery 12 is fully charged by the end of the suppression frame (YES in step S15), the processing unit 22 may reduce the charge amount in the suppression frame in the process of step S16, etc., so that the output estimate value becomes equal to the output upper limit value. [Explanation of symbols]

[0144] 1. Power selling system 11. Solar Power Generation Department 12 Storage battery 22 Processing section 100 Charging and discharging planning system

Claims

1. A charge / discharge plan creation system for creating a charge / discharge plan for the storage battery in an electricity selling system that has a power generation unit capable of generating electricity using natural energy and a storage battery that can charge and discharge electricity from the power generation unit and can sell electricity from the power generation unit, a charge / discharge plan creation unit that creates the charge / discharge plan based on a predicted value of the power generation amount of the power generation unit and a predicted value of the wholesale electricity market price; a first plan correction unit that, when an output suppression plan including a target time period for output suppression and a plan for an output upper limit value is distributed, corrects the charge / discharge plan by setting, based on the output suppression plan, a predicted excess time period in which the amount of power sold by the power selling system during the target time period is predicted to exceed the output upper limit value, as a planned charging time period in which the storage battery is charged so that the amount of power sold does not exceed the output upper limit value; a second plan correction unit that, when output suppression confirmation information including confirmation information of a target time period for output suppression and an output upper limit value is distributed after the output suppression plan, re-corrects the charge / discharge plan based on the output suppression confirmation information; Equipped with Charging and discharging planning system.

2. The first plan correction unit When it is predicted that the storage battery will be fully charged by the end of the target time period as a result of setting the predicted excess time period as the planned charging time period, a planned value of the charge amount of the storage battery during the predicted excess time period is set to an excess amount of the amount of sold electricity over the output upper limit value, and the planned value of the charge amount of the storage battery during time periods other than the predicted excess time period is subtracted by the excess amount. The charge / discharge plan creation system according to claim 1 .

3. The first plan correction unit When the storage battery is predicted to be fully charged by the end of the target time period as a result of setting the predicted excess time period as the planned charging time period, a planned value of the discharge amount from the storage battery in a time period before the predicted excess time period can be increased. The charge / discharge plan creation system according to claim 1 or 2.

4. The first plan correction unit The time period during which the planned value of the discharge amount from the storage battery is increased can be selected based on a time period during which the predicted value of the imbalance charge unit price is low or a predicted value of the wholesale electricity market unit price. The charge / discharge plan creation system according to claim 3 .

5. The first plan correction unit when the remaining amount of stored power of the storage battery exceeds a planned value during a scheduled discharging time period in which the storage battery is discharged as a result of setting the predicted excess time period as the scheduled charging time period, the amount of discharge of the storage battery during a time period prior to the scheduled discharging time period can be increased or the amount of charge of the storage battery can be decreased; A time period during which the amount of discharge of the storage battery is increased or the amount of charge of the storage battery is decreased can be selected based on a predicted value of the imbalance charge unit price. The charge / discharge plan creation system according to claim 1 .

6. The first plan correction unit when the remaining amount of stored power of the storage battery is insufficient for a planned value during a planned discharging time period in which the storage battery is discharged as a result of setting the predicted excess time period as the planned charging time period, it is possible to reduce the amount of discharge of the storage battery during a time period before the planned discharging time period, or to increase the amount of charge of the storage battery; A time period during which the amount of discharge of the storage battery is reduced or the amount of charge of the storage battery is increased can be selected based on a predicted value of the imbalance charge unit price. The charge / discharge plan creation system according to claim 1 .

7. The second plan correction unit It is possible to restore a planned value of the charge amount or discharge amount of the storage battery during a time period that is no longer subject to output suppression among the target time periods in the output suppression plan to the planned value of the charge amount or discharge amount of the storage battery in the charge / discharge plan before being corrected by the first plan correction unit. The charge / discharge plan creation system according to claim 1 .

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