Imbalance avoidance device, imbalance avoidance method, and imbalance avoidance program

Abstract

To provide an imbalance avoidance device, an imbalance avoidance method, and an imbalance avoidance program to make it easier to mount by avoiding predicted imbalance based on a power generation prediction value in a power generation system with a renewable energy power source and a storage battery, and enable operation that preserves a battery's reserve capacity for a future period.SOLUTION: An imbalance avoidance device according to the embodiment includes a charge / discharge plan creation unit that creates a charge / discharge plan for a storage battery so that a predicted imbalance, calculated based on a power generation prediction value of a renewable energy power source and a power generation plan, becomes smaller during a predetermined period, consisting of a plurality of predetermined unit times, in a power generation system that includes the renewable energy power source and the storage battery.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an imbalance avoidance device, an imbalance avoidance method, and an imbalance avoidance program. [Background technology]

[0002] In recent years, technological development has been progressing on virtual power plants (VPPs), which remotely and collectively control distributed energy resources (DERs) and organize multiple power generation companies into power generation balancing groups (hereinafter referred to as "BGs").

[0003] In some cases, renewable energy generators (solar power generation equipment, wind power generation equipment, etc.) or power generation systems equipped with renewable energy generators and storage batteries are used as DERs. In such power generation systems, penalties are incurred depending on the amount of imbalance, which is the difference between the power generation plan and the actual amount of power generated, so it is necessary to reduce the imbalance.

[0004] To avoid imbalances, there are methods that utilize battery control to absorb the imbalances. For example, there is a method (hereinafter referred to as "Method 1") that sets a target range for the amount of demanded energy to reduce the imbalance, and feedback controls the charging and discharging of the battery so that the amount of demanded energy does not deviate from the target range.

[0005] There is also a method that predicts the amount of power generation instead of using feedback control, and reduces the prediction imbalance, which is the difference between the power generation plan and the predicted power generation amount, by utilizing storage battery control. For example, there is a method (hereinafter referred to as "Method 2") that calculates the difference between the power plan value in the power sales plan of a group of consumers who are selling power to the grid (electric power system; the same applies below), and controls the charging and discharging power of each storage battery owned by each consumer at each time according to that difference. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6208614 [Patent Document 2] Patent No. 6789020 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in Method 1, calculations and control must be performed in real time, which places a constraint on the calculation time, and it is also affected by communication delays, making it difficult to implement.

[0008] Furthermore, in Method 2, the charge and discharge power of the storage battery is calculated and controlled for each hour, so it is not possible to operate the storage battery in a way that preserves its reserve power for future times. Therefore, if the reserve power of the storage battery is insufficient, it may become impossible to avoid imbalance after a certain time.

[0009] Therefore, an object of the present invention is to provide an imbalance avoidance device, an imbalance avoidance method, and an imbalance avoidance program that can be easily implemented by avoiding predicted imbalance based on power generation predictions, and that enable operation in a manner that preserves the reserve capacity of the storage battery for future times. [Means for solving the problem]

[0010] An imbalance avoidance device according to an embodiment includes a power generation system having a renewable energy power source and a storage battery, and includes a charge / discharge plan creation unit that creates a charge / discharge plan for the storage battery so as to reduce a predicted imbalance calculated based on a power generation prediction value and a power generation plan of the renewable energy power source for a predetermined period consisting of a plurality of predetermined unit times. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an outline of a power system according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing an outline of a charge / discharge plan in the first embodiment. [Figure 3] FIG. 3 is a diagram illustrating an example of the functional configuration of the imbalance avoidance device, the power generation system, and the storage battery system according to the first embodiment. [Figure 4] FIG. 4 is a flowchart showing an example of the flow of the imbalance avoidance process in the first embodiment. [Figure 5] FIG. 5 is a diagram showing an example of a plan creation time, a plan period, and an actual supply and demand time in the first embodiment. [Figure 6] FIG. 6 is a diagram illustrating the effect of avoiding imbalance in the first embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the functional configuration of the imbalance avoidance device, the power generation system, and the storage battery system according to the second embodiment. [Figure 8] FIG. 8 is a diagram showing an example of predicted update times in the second embodiment. [Figure 9] FIG. 9 is a flowchart showing an example of the flow of the imbalance avoidance process in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of an imbalance avoidance device, an imbalance avoidance method, and an imbalance avoidance program according to the present invention will be described with reference to the drawings. Note that, in the following, time can refer to either a moment in time or a time span of a predetermined unit time (e.g., 30 minutes, or one frame). Furthermore, "avoiding" imbalance does not only mean complete avoidance, but also includes partial avoidance (i.e., reduction).

[0013] (First embodiment) First, the first embodiment will be described with reference to FIGS.

[0014] (composition) 1 is a diagram showing an overview of a power system S in a first embodiment. The power system S includes an aggregator 1, consumers 4, a wholesale electricity market 5, a cross-regional organization 6, and a plurality of power plants 8.

[0015] OCCTO 6 is an organization that promotes cross-regional operation of transmission lines, and in order to ensure a stable supply of electricity, it monitors the nationwide electricity supply and demand situation and the operation status of power grid 2 24 hours a day, and manages the power supply and demand of the grid operator. All grid users (power generation companies, electricity retailers, etc.) who use power grid 2 are required to submit power generation and demand plans (annual, monthly, weekly, and day-ahead plans) to OCCTO 6, which then checks the consistency of these plans and forwards them to the grid operator.

[0016] The aggregator 1 is a business operator that aggregates and manages a plurality of power plants 8. The plurality of power plants 8 belong to a power generation BG3.

[0017] The aggregator 1 predicts the amount of power generated by each of a plurality of power plants 8, and sells the power in the wholesale electricity market 5 and directly trades electricity with consumers 4. The aggregator 1 also controls the amount of power generated by each of the power plants 8 based on the power generation schedule of the power plants 8, thereby achieving simultaneous balancing of the power generation amount according to the power generation plan submitted to the cross-regional organization 6 and contributing to load leveling in the power grid 2.

[0018] The aggregator 1 includes an imbalance avoidance device 10. The imbalance avoidance device 10 controls the storage battery of the power plant 8 based on the power generation plan value of the power plant 8 submitted to the cross-regional organization 6.

[0019] The power plants 8 are, for example, power generation systems 20a and 20b (hereinafter, also referred to as "power generation systems 20" when no particular distinction is needed), a storage battery system 21, etc. The power generation system 20a includes a storage battery 25 and a PV (Photovoltaics) 26. If the other power plants 8 include a storage battery 25, the power generation system 20a does not need to include the storage battery 25.

[0020] The PV 26 is a photovoltaic power generation device and is an example of a renewable energy power source. The power generation system 20a may be configured to include a renewable energy power source. Therefore, the power generation system 20a may be configured to include a power generation device that utilizes natural environments or resources such as geothermal energy, wind, or water, instead of the PV 26. In this embodiment, a configuration in which the power generation system 20a includes the PV 26, which is a photovoltaic power generation device, will be described as an example.

[0021] The power generation system 20b includes a PV 26. The storage battery system 21 includes a storage battery 25.

[0022] In this embodiment, the storage battery 25 of the power generation system 20a and the storage battery 25 of the storage battery system 21 can be charged from any PV 26 of the BG3.

[0023] In this embodiment, an example will be described in which the imbalance avoidance device 10 creates a charge / discharge plan for one or more storage batteries 25 included in BG3. FIG. 2 is a diagram showing an outline of the charge / discharge plan in the first embodiment. The charge / discharge plan is a plan regarding the charge / discharge amount of each storage battery 25 per unit time. The unit time is a management time managed by the power system S, and in this embodiment, an example will be described in which the unit time is 30 minutes.

[0024] Returning to FIG. 1, the imbalance avoidance device 10 is a PC (Personal Computer) or the like, and has a hardware configuration using a normal computer equipped with a CPU (Central Processing Unit), memory, an HDD (Hard Disk Drive), a communication interface (I / F), a display device such as a display, and input devices such as a keyboard and a mouse.

[0025] 3 is a diagram showing an example of the functional configuration of the imbalance avoidance device 10, the power generation system 20, and the storage battery system 21 in the first embodiment. Note that the power generation systems 20a, 20b, and the storage battery system 21 may be configured so that the power generation BG3 includes at least one storage battery 25 and one PV 26, and may not include the storage battery system 21, for example.

[0026] First, the power generation system 20a will be described. The power generation system 20a includes a watt-hour meter 23 and a power generation unit 24. The watt-hour meter 23 measures the amount of power output from the power generation unit 24. That is, the watt-hour meter 23 measures the power generation system output, which is the amount of power generated by the power generation system 20. The power generation system output is the amount of power supplied from the power generation system 20 to the power grid 2. The watt-hour meter 23 measures the power generation system output per unit time.

[0027] The power generation unit 24 includes the storage battery 25, the PV 26, and the control unit 27. As described above, in this embodiment, the storage battery 25 is charged not only from the PV 26 of the power generation system 20a but also from the PV 26 of the power generation system 20b. The control unit 27 controls charging and discharging of the storage battery 25 based on the charge and discharge plan and the power generation plan received from the imbalance avoidance device 10. Details of this control will be described later. The control unit 27 also outputs the amount of PV power generated by the PV 26 per unit time, the amount of charge and discharge power of the storage battery 25, and the storage battery SoC (State Of Charge), which is the charging rate of the storage battery, to the imbalance avoidance device 10. Note that this information may be configured to be output to the imbalance avoidance device 10 from each of the watt-hour meter 23, the storage battery 25, and the PV 26.

[0028] Unlike the power generation system 20a, the power generation system 20b does not include the storage battery 25. In this case, the control unit 27 outputs to the imbalance avoidance device 10 only the amount of PV-generated power by the PV 26 per unit time.

[0029] Next, a description will be given of the storage battery system 21. The storage battery system 21 includes a watt-hour meter 23 and a power storage unit .

[0030] The power storage unit 28 includes a storage battery 25 and a control unit 29. As described above, in this embodiment, the storage battery 25 can be charged from the PV 26 of the power generation systems 20a, 20b. The control unit 29 controls the charging and discharging of the storage battery 25 based on the charging and discharging plan and the power generation plan received from the imbalance avoidance device 10. Details of this control will be described later. The control unit 29 also outputs the amount of charging and discharging power of the storage battery 25 and the storage battery SoC, which is the charging rate of the storage battery, to the imbalance avoidance device 10 for each unit time. Note that this information may be output from the watt-hour meter 23 and the storage battery 25 to the imbalance avoidance device 10, respectively.

[0031] Next, we will explain the imbalance avoidance device 10. The imbalance avoidance device 10 includes a communication unit 11, an input unit 12, a display unit 13, a storage unit 14, and a control unit 15. The control unit 15 is communicatively connected to the communication unit 11, the input unit 12, the display unit 13, and the storage unit 14 via a bus or the like.

[0032] The communication unit 11 communicates with the cross-regional organization 6, the prediction system 7, the power generation system 20, and the storage battery system 21. The input unit 12 is an input device such as a keyboard that accepts operation input by a user. The display unit 13 is a display that displays various types of information. The storage unit 14 stores various types of information. The storage unit 14 is, for example, a HDD, a memory, etc.

[0033] The control unit 15 executes various controls and processes. For example, the control unit 15 creates a charge / discharge plan for the storage battery 25 to avoid imbalance. The control unit 15 includes a charge / discharge plan creation unit 151, an imbalance calculation unit 152, a display control unit 153, and a system control unit 154.

[0034] The charge / discharge plan creation unit 151 creates a charge / discharge plan for the storage battery for a predetermined period consisting of a plurality of predetermined unit times in the power generation system 20 so as to reduce the predicted imbalance calculated based on the predicted power generation value and power generation plan of the renewable energy power source. Specifically, for example, the charge / discharge plan creation unit 151 creates a charge / discharge plan that minimizes or maximizes a predetermined objective function value for a given period (predetermined period) based on the power generation plan value for the given period submitted to the cross-regional organization 6, the predicted power generation value of the PV 26 for the same period, the predicted imbalance unit price for the same period, and the current storage battery SoC. In this embodiment, the objective function is the sum of the predicted imbalance charges for the given period, and an example is shown in which this objective function is minimized. The predicted imbalance charge is a predicted fee to be paid between grid users and grid operators for compensating for power shortages or purchasing surplus power. It is calculated by summing the product of the predicted imbalance unit price and the predicted imbalance for each unit time.

[0035] First, the charge / discharge plan creation unit 151 acquires the predicted power generation value of the PV 26 and the predicted imbalance unit cost. The predicted power generation value of the PV 26 is a predicted value of the amount of power generated by the PV 26 per unit time. The predicted imbalance unit cost is a predicted value of the imbalance unit cost per unit amount of power per unit time. Hereinafter, the predicted power generation value of the PV 26 may be referred to as the predicted PV power generation value. Furthermore, the predicted PV power generation value and the predicted imbalance unit cost may be collectively referred to as prediction information. The charge / discharge plan creation unit 151 acquires prediction information from the prediction system 7, the input unit 12, the storage unit 14, etc. Note that the charge / discharge plan creation unit 151 may derive the predicted PV power generation value based on the actual measured value of the amount of PV power generated by the PV 26 acquired from the power generation system 20, meteorological information such as the amount of sunlight, etc., or may derive (estimate) the predicted imbalance unit cost from past imbalance unit cost information acquired from the prediction system 7, the input unit 12, the storage unit 14, etc.

[0036] The imbalance calculation unit 152 calculates the predicted imbalance per unit time by calculating the difference between the PV power generation predicted value acquired from the prediction system 7, the input unit 12, the memory unit 14, etc. and the power generation plan value acquired from the input unit 12, the memory unit 14, etc.

[0037] The charge / discharge plan creation unit 151 creates a charge / discharge plan that minimizes the total sum of predicted imbalance fees based on the prediction information and the predicted imbalance for each unit time calculated by the imbalance calculation unit 152.

[0038] The charge / discharge plan creation unit 151 outputs the created plan to the display control unit 153 and the system control unit 154.

[0039] The display control unit 153 displays various information on the display unit 13. For example, the display control unit 153 displays the charge / discharge plan received from the charge / discharge plan creation unit 151 on the display unit 13. Therefore, the user can check the charge / discharge plan for the storage battery 25 by visually checking the display unit 13.

[0040] The system control unit 154 executes various controls. For example, the system control unit 154 outputs charge / discharge instruction values ​​to the power generation system 20 and the storage battery system 21 in accordance with the charge / discharge plan received from the charge / discharge plan creation unit 151, and controls the storage battery 25.

[0041] The control unit 27 of the power generation system 20a (control unit 29 of the storage battery system 21) that receives the charge / discharge instruction value from the imbalance avoidance device 10 controls the storage battery 25 based on the received charge / discharge instruction value. Specifically, the control unit 27 (control unit 29) controls the charging power and discharging power of the storage battery 25 in accordance with the charge / discharge instruction value. When the storage battery 25 receives an instruction signal indicating the charge amount, it charges the storage battery 25 with the charging power indicated by the instruction signal, out of the power generated by the PV 26. Furthermore, when the storage battery 25 receives an instruction signal indicating the discharging power, it discharges the discharging power indicated by the instruction signal to the power grid 2.

[0042] The system control unit 154 may control the storage battery 25 based on the charge / discharge plan created by the charge / discharge plan creating unit 151. That is, the system control unit 154 may be configured to have the control function of the control unit 27 for the storage battery 25 (the control function of the control unit 29 for the storage battery 25).

[0043] In this embodiment, a configuration in which the system control unit 154 controls the storage battery 25 based on the charge and discharge plan created by the charge and discharge plan creating unit 151 will be described as an example.

[0044] Each of the units 151 to 154 is realized by, for example, one or more processors. For example, each of the units 151 to 154 may be realized by a processor such as a CPU executing a program, that is, by software. Each of the units 151 to 154 may also be realized by a processor such as a dedicated IC (Integrated Circuit), that is, by hardware. Each of the units 151 to 154 may also be realized by a combination of software and hardware. When multiple processors are used, each processor may realize one of the units 151 to 154, or may realize two or more of the units. The prediction update unit 155 in the second embodiment is also realized in the same way as each of the units 151 to 154.

[0045] Next, a specific example of calculation in the control unit 15 will be described. The charge / discharge plan creation unit 151 creates a charge / discharge plan by solving an optimization problem that minimizes the total sum of predicted imbalance charges as an objective function. In this embodiment, the charge / discharge plan creation unit 151 classifies each time by case classification based on the following formula (1), and calculates an optimal solution to an optimization model (optimization problem) that minimizes the objective function of formula (2) under the constraint conditions shown in formulas (3) to (14), thereby calculating a charge / discharge plan for the storage battery 25. The optimization problem of formulas (2) to (14) is a problem called a linear programming problem. The charge / discharge plan creation unit 151 calculates an optimal solution that minimizes the objective function of formula (2) by, for example, a simplex method, an interior point method, or the like.

[0046] ·Case distinction The predicted imbalance (the difference between the predicted power generation value and the power generation plan) before imbalance avoidance is expressed as Equation (1).

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[0047] Depending on whether the predicted imbalance is a shortage imbalance or an excess imbalance, the predicted imbalance unit cost used in the calculation and whether the storage battery will discharge or charge will differ. Therefore, at any time t=0,…,T opt For -1, the optimization problem is defined by dividing it into Case 1 and Case 2 below.

[0048]

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[0049] Variable list P imb (t): Predicted imbalance after avoidance at time t (kWh) However, for each time t, In Case 1, the imbalance In Case 2, there is a surplus imbalance. P bt (k,j,t): Charge / discharge amount (kWh) of battery j at power plant k at time t However, for each time t, In Case 1, the discharge amount In Case 2, the charge amount ·W bt (k,j,t): Remaining charge (kWh) of battery j at power plant k at time t

[0050]

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[0051] Objective function The objective function for minimizing the total predicted imbalance charge is given by equation (2).

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[0052] ·Restrictions (1) Forecast Imbalance Any time t=0,…,T opt Regarding -1, (1-1) Definition of forecast imbalance

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[0053] (2) Power plant output Any power plant k=0,…,l-1 at time t=0,…,T opt Regarding -1, (2-1) Maximum permitted output of power plants

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[0054] (3) Storage battery

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[0055] (4) Imbalance increase limit constraint

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[0056] Equations (3) and (4) are constraint equations that represent the predicted imbalance after the imbalance is avoided by operating the storage battery 25. Equations (5) and (6) are constraint equations that indicate that the output of the power plant 8 does not exceed the predetermined authorized output.

[0057] Equation (7) is a constraint equation that indicates that the charge / discharge amount of the storage battery 25 does not exceed the upper limit. Equations (8) and (9) are expressed as follows: opt 10 is a constraint equation representing the remaining charge of the storage battery 25 at −1.

[0058] The formula (10) is a constraint formula that indicates that the charge / discharge amount of the storage battery 25 falls within the range of the upper and lower limits. Equations (11) and (12) are constraint equations that represent the remaining charge of the storage battery 25 at time t=0. Equations (13) and (14) are constraints that restrict the imbalance from being intentionally increased in order to minimize the predicted imbalance charge.

[0059] In this embodiment, the sum of the predicted imbalance charges in equation (1) is used as the objective function, but the sum of the absolute values ​​of the predicted imbalances shown in equation (15) below may also be used as the objective function.

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[0060] (action) FIG. 4 is a flowchart showing an example of the flow of the imbalance avoidance process in the first embodiment. The charge / discharge plan creating unit 151 acquires a predicted PV power generation value from the prediction system 7, the input unit 12, the storage unit 14, etc. (step S101).

[0061] Next, the charge / discharge plan creation unit 151 acquires the power generation plan submitted to the cross-regional organization 6 from the input unit 12, the storage unit 14, etc. (step S102).

[0062] Next, the charge / discharge plan creation unit 151 acquires the predicted imbalance unit cost from the prediction system 7, the input unit 12, the storage unit 14, etc. (step S103).

[0063] Next, the imbalance calculation unit 152 calculates the predicted imbalance for each time unit based on the predicted PV power generation value acquired in step S101 and the power generation plan acquired in step S102 (step S104).

[0064] Next, the charge / discharge plan creation unit 151 creates a charge / discharge plan for the storage battery 25 by solving the optimization problem described above (S105). Here, Fig. 5 is a diagram showing an example of the plan creation time, the plan period, and the actual supply and demand time in the first embodiment. In the example of Fig. 5, a charge / discharge plan for 24 hours (48 frames) from 9:00 AM to 9:00 AM the next day is created at 7:00 AM on the current day.

[0065] Returning to FIG. 4, the display control unit 153 displays the charge / discharge plan for each storage battery created in step S105 on the display unit 13 (step S106).

[0066] Next, the system control unit 154 determines whether the actual supply and demand time at which the period of the charge and discharge plan begins has arrived (step S107), and if No, waits for processing (step S110) and returns to step S107, and if Yes, executes the charge and discharge plan created in step S105 (step S108). For example, the system control unit 154 controls the storage battery 25 via the communication unit 11 using charge and discharge instruction values ​​for each time created from the charge and discharge plan created in step S105.

[0067] After step S108, the system control unit 154 determines whether the calculation period has ended (step S109), and if Yes, ends the process, and if No, returns to step S107.

[0068] (effect) As described above, according to this embodiment, implementation is facilitated by avoiding predicted imbalance based on power generation prediction, and operation is enabled to conserve the battery's remaining capacity for future times.

[0069] The effect of this embodiment will be described using an example. FIG. 6 is an explanatory diagram of the effect of imbalance avoidance in the first embodiment. An example of the predicted imbalance unit cost, the predicted imbalance before and after avoidance, and the transition of the remaining charge amount is shown for both the publicly known technology and this embodiment. Here, as shown in (a1) and (a2), the predicted imbalance unit cost shows a case where the shortage imbalance unit cost is high in the last hour of the planning period, and if the predicted imbalance in this time period is large, the predicted imbalance fee also becomes high.

[0070] As shown in (b1) and (c1), in the prior art, imbalance avoidance is performed for each hour of the day, so imbalance avoidance is performed by discharging the storage battery 25 in order from the beginning of the planning period. Therefore, if the remaining charge reaches the lower limit before the last hour, the storage battery 25 cannot be discharged any further, and it becomes impossible to avoid imbalance in the last hour, when the shortage imbalance unit cost is high.

[0071] On the other hand, as shown in (b2) and (c2), in this embodiment, a charge / discharge plan that minimizes the predicted imbalance fee is created for the entire planning period. As a result, by creating a charge / discharge plan that preserves the remaining charge in preparation for a time period when the predicted imbalance unit price is high, it is possible to preferentially avoid imbalance in the last hour of the month, when the deficiency imbalance unit price is high. Therefore, it is possible to significantly reduce the predicted imbalance fee for the entire planning period compared to known technologies.

[0072] (Second embodiment) Next, a second embodiment will be described with reference to Figures 7 to 9. Note that descriptions that overlap with the first embodiment will be omitted as appropriate.

[0073] (composition) FIG. 7 is a diagram showing an example of the functional configuration of the imbalance avoidance device 10, the power generation system 20, and the storage battery system 21 in the second embodiment.

[0074] In this embodiment, the control unit 15 includes a prediction update unit 155 in addition to the configuration of the first embodiment.

[0075] The prediction update unit 155 updates at least one of the PV power generation prediction value and the predicted imbalance unit price to new values ​​at a time after the time when the charge / discharge plan creation unit 151 has created a charge / discharge plan at least once, and outputs the updated values ​​to the charge / discharge plan creation unit 151.

[0076] 8 is a diagram showing an example of a forecast update time in the second embodiment. In the following description, at least one of the PV power generation forecast value and the forecast imbalance unit cost to be updated may be referred to as forecast update information. The forecast update unit 155 acquires the forecast update information from the prediction system 7, the input unit 12, the storage unit 14, etc. The forecast update unit 155 may derive the PV power generation forecast value based on the actual measured value of the PV power generation amount of the PV 26 acquired from the power generation system 20, meteorological information such as the amount of sunlight, etc., or may derive (estimate) the forecast imbalance unit cost based on past imbalance unit cost information acquired from the prediction system 7, the input unit 12, the storage unit 14, etc.

[0077] When receiving prediction update information from the prediction update unit 155, the charge / discharge plan creation unit 151 updates the prediction information and recreates the charge / discharge plan for the storage battery 25 in the same manner as in the first embodiment. In addition, the charge / discharge plan creation unit 151 outputs the recreated plan to the display control unit 153 and the system control unit 154.

[0078] (action) 9 is a flowchart showing an example of the flow of the imbalance avoidance process in the second embodiment. Steps S101 to S106 are the same as those in the first embodiment (FIG. 4).

[0079] After step S106, the system control unit 154 determines whether the actual supply and demand time when the charging and discharging plan period begins has arrived (step S107). If No, the system control unit 154 obtains forecast update information (step S111) and proceeds to step S112; if Yes, the system control unit 154 executes the charging and discharging plan created in step S105 (step S108).

[0080] In step S112, the system control unit 154 determines whether or not there is an update to the prediction, and if Yes, the process proceeds to step S113, and if No, the process returns to step S107.

[0081] In step S113, the charge / discharge plan creation unit 151 receives the prediction update information from the prediction update unit 155, updates the prediction information, and returns to step S104. As a result, the processes from step S104 onwards are executed using the updated prediction information.

[0082] After step S108, the system control unit 154 determines whether the calculation period has ended (step S109), and if Yes, ends the process, and if No, returns to step S107.

[0083] (effect) According to the second embodiment, in addition to the effect of the first embodiment, there is an effect that a further reduction in the predicted imbalance fee can be expected by creating a charge / discharge plan that takes into account the latest PV power generation predicted value and the predicted imbalance.

[0084] In the above-described embodiment, the program for executing the information processing has a modular configuration including each of the plurality of functional units, and in actual hardware, for example, a CPU reads and executes the information processing program from a ROM (Read Only Memory) or a HDD, thereby loading each of the plurality of functional units into a RAM (Random Access Memory), and generating each of the plurality of functional units in the RAM (main memory). Note that it is also possible to realize some or all of the plurality of functional units using dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0085] Although the embodiments of the present disclosure have been described above, the above embodiments are presented as examples and are not intended to limit the scope of the present disclosure. The novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The above embodiments are included within the scope and spirit of the present disclosure, as well as within the scope of the inventions and their equivalents as defined in the claims.

[0086] For example, at least a part of the functions of the imbalance avoidance device 10 may be realized by a cloud computing system.

[0087] Furthermore, the target period of the charge / discharge plan is not limited to the above-mentioned 24 hours, but may be any period corresponding to a plurality of frames, such as 12 hours, one week, or other periods. [Explanation of symbols]

[0088] 1...Aggregator, 2...Power system, 3...Power generation BG, 4...Consumer, 5...Wholesale electricity market, 6...Occupational-regional organization, 7...Prediction system, 10...Immalance avoidance device, 11...Communication unit, 12...Input unit, 13...Display unit, 14...Memory unit, 15...Control unit, 20a, 20b...Power generation system, 21...Storage battery system, 23...Watt-hour meter, 24...Power generation unit, 25...Storage battery, 26...PV, 27...Control unit, 28...Power storage unit, 151...Charge / discharge plan creation unit, 152...Immalance calculation unit, 153...Display control unit, 154...System control unit, 155...Prediction update unit, S...Power system

Claims

1. a charge / discharge plan creation unit that creates a charge / discharge plan for the storage battery so as to reduce a predicted imbalance calculated based on a power generation prediction value and a power generation plan of the renewable energy power source for a predetermined period consisting of a plurality of predetermined unit times in a power generation system having a renewable energy power source and a storage battery; An imbalance avoidance device comprising:

2. The imbalance avoidance device according to claim 1 , further comprising a system control unit that controls the storage battery in accordance with the charge / discharge plan.

3. 2. The imbalance avoidance device according to claim 1, further comprising: an imbalance calculation unit that calculates the predicted imbalance, which is a predicted value of imbalance, based on the power generation prediction value of the renewable energy power source and the power generation plan submitted to a cross-regional organization.

4. the charge / discharge plan creation unit sets an objective function used to reduce the predicted imbalance, The imbalance avoidance device according to claim 1 , wherein a charge / discharge plan for the storage battery is created so as to minimize or maximize a value of the objective function in the predetermined period.

5. the objective function is an objective function that represents a sum of absolute values ​​of the predicted imbalances over the predetermined period, The imbalance avoidance device according to claim 4 , wherein the charge / discharge plan creation unit creates a charge / discharge plan for the storage battery so as to minimize a value of the objective function in the predetermined period.

6. the objective function is an objective function that represents a sum of predicted imbalance charges based on the predicted power generation value, the power generation plan, and a predicted imbalance unit price, The imbalance avoidance device according to claim 4 , wherein the charge / discharge plan creation unit creates a charge / discharge plan for the storage battery so as to minimize a value of the objective function in the predetermined period.

7. a forecast update unit that updates at least one of the power generation forecast value and the forecasted imbalance unit price, The imbalance avoidance device according to claim 6 , wherein when at least one of the predicted power generation value and the predicted imbalance unit price is updated, the charge / discharge plan creation unit recreates the charge / discharge plan.

8. a charge / discharge plan creation step in which a charge / discharge plan creation unit creates a charge / discharge plan for the storage battery so as to reduce a predicted imbalance calculated based on a power generation prediction value and a power generation plan of the renewable energy power source for a predetermined period consisting of a plurality of predetermined unit times in a power generation system having a renewable energy power source and a storage battery; Imbalance avoidance methods, including:

9. Computer, An imbalance avoidance program for causing a power generation system having a renewable energy power source and a storage battery to function as a charge / discharge plan creation unit that creates a charge / discharge plan for the storage battery so as to reduce a predicted imbalance calculated based on a power generation forecast value and a power generation plan of the renewable energy power source for a predetermined period consisting of a plurality of predetermined unit times.

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