Charge / discharge planning device, charge / discharge planning method and program

Abstract

To avoid excessive imbalance and insufficient imbalance, which occur on a power delivery date, by charging / discharging of a storage battery.SOLUTION: A charge / discharge planning device for generating a charge / discharge plan on a power trading date of a storage battery includes: a prediction unit for predicting initial SOC of the storage battery before a power generation facility starts power generation on a power delivery date after the power trading date before bidding of power trading based on the charge / discharge plan on the power trading date; a comparison unit for comparing the initial SOC and prescribed reference SOC; and a charge / discharge planning unit for generating a first charge / discharge plan based on a power amount smaller than a power amount predicted to be generated by the power generation facility on the power delivery date when the initial SOC is smaller than the reference SOC and generating a second charge / discharge plan based on the power amount larger than the power amount predicted to be generated by the power generation facility on the power delivery date when the initial SOC is larger than the reference SOC.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a charge / discharge plan creating device, a charge / discharge plan creating method, and a program. [Background technology]

[0002] The Feed-in-Premium (FIP) system has been introduced for selling electricity generated by power generation facilities that use renewable energy (e.g., solar, wind, hydroelectric, etc.). With the introduction of the FIP system, a so-called time shift method has been proposed to deal with surplus imbalance or shortage imbalance, which is the difference between the planned value of the amount of electricity that is, for example, spot-bid on the day of the electricity trading and the actual value of the amount of electricity that is actually generated by the power generation facility on the day of the electricity delivery, which is the day after the electricity trading day (see, for example, Patent Document 1), in which a power generation facility and a storage battery are combined, and when a surplus imbalance occurs, the surplus amount of electricity is charged to the storage battery, and when a shortage imbalance occurs, the shortage amount of electricity is discharged from the storage battery (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-98952 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if an excess imbalance occurs consecutively on an electricity trading day, where the actual value of the amount of power of the power generation facility is greater than the planned value of the amount of power, the battery's SOC will reach its upper limit or a value close to the upper limit as the battery continues to charge, and if an excess imbalance occurs on the next day's electricity delivery date, the battery may not be able to charge the entire amount of excess power, and the excess imbalance may not be avoided by just charging the battery. On the other hand, if an insufficient imbalance occurs consecutively on an electricity trading day, where the actual value of the amount of power of the power generation facility is less than the planned value of the amount of power, the battery's SOC will reach its lower limit or a value close to the lower limit as the battery continues to discharge, and if an insufficient imbalance occurs on the next day's electricity delivery date, the battery may not be able to discharge the entire amount of insufficient power, and the insufficient imbalance may not be avoided by just discharging the battery.

[0005] The present invention has been made in consideration of the above-mentioned problems, and one object of the present invention is to provide a charge / discharge plan creation device, a charge / discharge plan creation method, and a program that create a charge / discharge plan that enables a storage battery to charge and discharge in a manner that avoids surplus imbalance and shortage imbalance that occur on the power delivery date. [Means for solving the problem]

[0006] One of the present inventions for achieving the above-mentioned object is a charge / discharge plan creation device that creates a charge / discharge plan on an electricity trading day for a storage battery that charges electricity generated by a renewable energy power generation facility and discharges the charged electricity, the charge / discharge plan creation device including: a prediction unit that predicts an initial SOC of the storage battery before the power generation facility starts generating electricity on a power delivery date after the power trading day, before a bid for electricity trading based on the charge / discharge plan is made on the electricity trading day; a comparison unit that compares the initial SOC with a preset reference SOC; and a charge / discharge plan creation unit that, when a comparison result of the comparison unit indicates that the initial SOC is smaller than the reference SOC, creates a first charge / discharge plan based on an amount of electricity smaller than the amount of electricity predicted to be generated by the power generation facility on the power delivery day, and, when a comparison result of the comparison unit indicates that the initial SOC is larger than the reference SOC, creates a second charge / discharge plan based on an amount of electricity larger than the amount of electricity predicted to be generated by the power generation facility on the power delivery day.

[0007] According to the charge / discharge plan creation device of the present invention, when a bid is made according to the first charge / discharge plan on the power trading day, the actual value of the power amount of the power generation facility on the power transfer day is more likely to be greater than the planned value of the power amount of the power generation facility on the power trading day, making it possible to avoid an excess imbalance that occurs on the power transfer day by charging the storage battery. Also, when a bid is made according to the second charge / discharge plan on the power trading day, the actual value of the power amount of the power generation facility on the power transfer day is more likely to be less than the planned value of the power amount of the power generation facility on the power trading day, making it possible to avoid an insufficient imbalance that occurs on the power transfer day by discharging the storage battery.

[0008] In addition, another aspect of the present invention for achieving the above-mentioned object is a charge / discharge plan creation device, in which the first charge / discharge plan is created based on an amount of power predicted to be generated by the power generation equipment on the power delivery date multiplied by a first coefficient less than 1.

[0009] According to the charge / discharge plan creation device of the present invention, by simply setting the first coefficient to a predetermined value less than 1, it is possible to increase the likelihood that the actual value of the power generation facility's power amount on the power delivery date will be greater than the planned value of the power generation facility's power amount on the power trading date.

[0010] In addition, another aspect of the present invention for achieving the above-mentioned object is a charge / discharge plan creation device, in which the first coefficient is set based on a value obtained by dividing the difference between the initial SOC and the reference SOC by a DC / AC conversion efficiency in a power conditioner of the storage battery.

[0011] According to the charge / discharge plan creation device of the present invention, the first coefficient is set based on information specific to the storage battery used, making it possible to reliably increase the likelihood that the actual value of the power generation equipment's power amount on the power transfer date will be greater than the planned value of the power generation equipment's power amount on the power trading date.

[0012] In addition, another aspect of the present invention for achieving the above-mentioned object is that, in a charge / discharge plan creation device, the second charge / discharge plan is created based on an amount of power predicted to be generated by the power generation equipment on the power delivery date multiplied by a second coefficient greater than 1.

[0013] According to the charge / discharge plan creation device of the present invention, by simply setting the second coefficient to a predetermined value greater than 1, it is possible to increase the likelihood that the actual value of the power generation facility's power amount on the power delivery date will be smaller than the planned value of the power generation facility's power amount on the power trading date.

[0014] In addition, another aspect of the present invention for achieving the above-mentioned object is that, in a charge / discharge plan creation device, the second coefficient is a value set based on a value obtained by multiplying the difference between the initial SOC and the reference SOC by the DC / AC conversion efficiency in a power conditioner of the storage battery.

[0015] According to the charge / discharge plan creation device of the present invention, the second coefficient is set based on information specific to the storage battery used, making it possible to reliably increase the likelihood that the actual value of the power generation equipment's power amount on the power transfer date will be smaller than the planned value of the power generation equipment's power amount on the power trading date.

[0016] In addition, the problems and solutions disclosed in this application will be made clear by the description in the section of the preferred embodiment of the invention and the descriptions in the drawings. Effect of the Invention

[0017] According to the present invention, it is possible to avoid surplus imbalance and shortage imbalance that occur on the day of power delivery by charging and discharging the storage battery. [Brief description of the drawings]

[0018] [Figure 1] 1 is a block diagram showing a schematic configuration of a power generation system 1 including a charge / discharge schedule creation device 100. FIG. [Diagram 2] 13 is a graph showing an example of the relationship between the power price on the power delivery date predicted by the power price prediction device 120 and a first amount of power 274, a second amount of power 275, and a third amount of power 276. [Diagram 3] 2 is a block diagram showing an outline of functions of a charge and discharge plan creation device 100. FIG. [Figure 4] 2 is a block diagram showing an example of hardware of an information processing device 10 that realizes the functions of the charge and discharge plan creation device 100. FIG. [Diagram 5] 5 is a flowchart showing an example of a process performed by the charge and discharge plan creation device 100 when creating a charge and discharge plan. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] At least the following matters will become apparent from the description of this specification and the accompanying drawings. Hereinafter, the present invention will be described in detail based on an embodiment thereof with reference to the accompanying drawings.

[0020] 1 is a block diagram showing a schematic configuration of a power generation system 1 including a charge / discharge plan creation device 100 according to this embodiment. In this embodiment, the power generation facility using renewable energy is, for example, a photovoltaic power generation facility (hereinafter, referred to as a "PV power generation facility" (PV: Photo Voltaic)) 140 that generates power by using sunlight.

[0021] The power generation system 1 includes a charge / discharge plan creation device 100, a weather information providing device 110, an electricity price prediction device 120, an electricity amount prediction device 130, a PV power generation facility 140, a storage battery control device 150, and a storage battery 160.

[0022] The charge / discharge plan creation device 100, the weather information providing device 110, the power price prediction device 120, the power amount prediction device 130, the PV power generation facility 140, the storage battery control device 150, and the storage battery 160 are connected in a state in which they can communicate with each other via a communication network 170. The communication network 170 is, for example, a local area network (LAN), a wide area network (WAN), a dedicated line, a power line communication network, various public communication networks, etc. In addition to the communication network 170, the PV power generation facility 140 and the storage battery 160 are also connected to a power system 180 operated by a general power transmission and distribution company, etc.

[0023] The PV power generation facility 140 includes a photovoltaic power generation panel configured using, for example, a polycrystalline silicon power generation element, a monocrystalline silicon power generation element, a thin-film power generation element, or the like. The PV power generation facility 140 also includes a power conditioner (PCS: Power Conditioning Subsystem) 141 that converts the power generated by the photovoltaic power generation panel from direct current to alternating current and supplies the power to a power grid 180. The power generated by the PV power generation facility 140 is either supplied to the power grid 180 via the power conditioner 141 (sold to a general power transmission and distribution company) or supplied to the storage battery 160 (charged to the storage battery 160). In this embodiment, the power generated by the PV power generation facility 140 is planned to be charged to the storage battery 160 in a plurality of charging frames in a charge and discharge plan including a planned value of the amount of power when making a spot bid on a power trading day (spot bid day). It should be noted that a day is divided into, for example, 30-minute frames, and is composed of a total of 48 frames. The charge / discharge plan includes 48 frames, and among these 48 frames, there are a plurality of charge frames for planning charging of power to the storage battery 160 on the power delivery date, and a plurality of discharge frames for planning discharging of power from the storage battery 160 on the power delivery date. The planned value of the amount of power to be charged in each of the plurality of charge frames and the planned value of the amount of power to be discharged in each of the plurality of discharge frames are set according to the power price and amount of power predicted on the power delivery date.

[0024] The storage battery 160 is, for example, a lead battery, a lithium ion battery, a sodium-sulfur battery, a nickel-metal hydride battery, a redox flow battery, a fuel cell, a capacitor battery, etc. The storage battery 160 includes a power conditioner (PCS) 161 for charging and discharging between the storage battery 160 and the power grid 180. When discharging the power charged in the storage battery 160 to the power grid 180, the power conditioner 161 converts the power charged in the storage battery 160 from direct current to alternating current, and when charging the storage battery 160 with power from the power grid 180, the power conditioner 161 converts the power from the power grid 180 from alternating current to direct current.

[0025] The weather information providing device 110 provides the power price prediction device 120 and the power amount prediction device 130 with weather information (e.g., temperature, solar radiation, etc.) for the region where the PV power generation facility 140 is installed on the power delivery day, which is the day after the power trading day and when power is bought and sold. This weather information is provided for each frame, with each frame being a time span of, for example, 30 minutes. The weather information providing device 110 may obtain the above weather information from a meteorological observation station in the region where the PV power generation facility 140 is installed, or may obtain the above weather information from a weather information providing server managed by the Japan Meteorological Agency.

[0026] The power price prediction device 120 refers to the weather information acquired from the weather information providing device 110 and information such as date, time, and day of the week for the power delivery date, and predicts the power price (yen / kW) of the power to be bought and sold on the power delivery date. In this embodiment, the power price prediction device 120 predicts the power price for each frame. As a method for the power price prediction device 120 to predict the power price, for example, a well-known technology that predicts the power price by combining the above-mentioned weather information, information such as date, time, and day of the week, and an analysis technology such as artificial intelligence can be used. The power price prediction device 120 may also acquire a predicted value of the power price published by a third party via the communication network 170 or the Internet.

[0027] The power amount prediction device 130 predicts the first amount of power 274 (MWh) generated by the PV power generation facility 140 for each frame for the power delivery date based on the weather information acquired from the weather information providing device 110, the location information (latitude, longitude, etc.) of the PV power generation facility 140, the installation area and installation angle of the solar power generation panel, and other information. Note that, as a method for the power amount prediction device 130 to predict the first amount of power 274 generated by the PV power generation facility 140, for example, a well-known technology such as a physical model that combines an analysis technology that pinpoints the amount of power to be generated with information such as the above-mentioned weather information, the location information of the PV power generation facility 140, the installation area and installation angle of the solar power generation panel, or a statistical model that combines an analysis technology such as artificial intelligence that has learned the relationship between past weather information and the actual value of the amount of power generated can be used.

[0028] The charge and discharge plan creation device 100 predicts the initial SOC272 of the storage battery 160 on the power delivery day in a time period before the final time (e.g., 10:00) when spot bidding is possible during the power trading day. Specifically, the charge and discharge plan creation device 100 acquires weather information for the power delivery day from the weather information providing device 110, and predicts, based on this weather information, the SOC at the time (e.g., sunrise time) when the storage battery 160 is first able to charge power on the power delivery day, as the initial SOC272. The charge and discharge plan creation device 100 compares the predicted initial SOC272 with the reference SOC273 to see whether it is a larger or smaller value. Here, the reference SOC273 is a standard SOC for determining whether the storage battery 160 has an initial SOC272 that allows it to avoid surplus imbalance, and whether the storage battery 160 has an initial SOC272 that allows it to avoid deficiency imbalance, based on the first amount of power 274 on the power delivery date predicted by the power amount prediction device 130, for each frame after the time when the storage battery 160 is first able to charge power on the power delivery date, and is set to, for example, 50%.

[0029] When the comparison result shows that the initial SOC 272 is smaller than the reference SOC 273, the charge / discharge plan creation device 100 selects the first coefficient α1 from the first coefficient α1 less than 1 and the second coefficient α2 greater than 1, which are prepared in advance, since the storage battery 160 has more capacity to charge power than to discharge power, and calculates a second amount of power 275 smaller than the first amount of power 274 by multiplying the first amount of power 274, which is the total amount of power for 48 frames of the power delivery day predicted by the power amount prediction device 130, by the first coefficient α1. The charge / discharge plan creation device 100 creates a first charge / discharge plan 277 including a planned value of the amount of power to be spot bid on the power trading day, based on the power price on the power delivery day predicted by the power price prediction device 120 and the second amount of power 275. Then, if a spot bid is made in accordance with the first charge / discharge plan 277 by the final bidding time on the power trading day, there is a high possibility that the actual value of the amount of power of the PV power generation equipment 140 on the power delivery day will be greater than the planned value of the amount of power of the PV power generation equipment 140 on the power trading day, so it is possible to avoid the surplus imbalance that occurs on the power delivery day by charging the storage battery 160.

[0030] On the other hand, when the comparison result shows that the initial SOC 272 is greater than the reference SOC 273, the charge / discharge plan creation device 100 selects the second coefficient α2 from the first coefficient α1 and the second coefficient α2 prepared in advance because the storage battery 160 has more room to discharge power than to charge power, and calculates a third amount of power 276 having a value greater than the first amount of power 274 predicted by the power amount prediction device 130 by multiplying the first amount of power 274, which is the total amount of power for 48 frames of the power delivery day predicted by the power amount prediction device 130, by the second coefficient α2. The charge / discharge plan creation device 100 creates a second charge / discharge plan 278 including a planned value of the amount of power to be spot bid on the power trading day, based on the power price on the power delivery day predicted by the power price prediction device 120 and the third amount of power 276. Then, if a spot bid is made in accordance with the second charging / discharging plan 278 by the final bidding time on the power trading day, the actual value of the amount of power of the PV power generation equipment 140 on the power delivery day is likely to be smaller than the planned value of the amount of power of the PV power generation equipment 140 on the power trading day, so it is possible to avoid a shortage imbalance that occurs on the power delivery day by discharging the storage battery 160.

[0031] FIG. 2 is a graph showing an example of the relationship between the electricity price on the electricity delivery date predicted by the electricity price prediction device 120, a first amount of electricity 274 which is the amount of electricity generated by the PV power generation equipment 140 on the electricity delivery date predicted by the electricity amount prediction device 130, a second amount of electricity 275 obtained by multiplying the first amount of electricity 274 by a first coefficient α1 which is less than 1, and a third amount of electricity 276 obtained by multiplying the first amount of electricity 274 by a second coefficient α2 which is greater than 1.

[0032] 2, the scale on the horizontal axis indicates the time from 0:00 to 24:00 on the power delivery date, the scale on the vertical axis on the left side indicates the amount of power (MWh) generated by the PV power generation facility 140, and the scale on the vertical axis on the right side indicates the power price (yen / kW) in a market where power is bought and sold. Also, in FIG. 2, the thin solid line indicates the first power amount 274 of the PV power generation facility 140 on the power delivery date predicted by the power amount prediction device 130, the thin chain line indicates the power price on the power delivery date predicted by the power price prediction device 120, the thick solid line indicates the second power amount 275 obtained by multiplying the first power amount 274 by the first coefficient α1, and the thick dashed line indicates the third power amount 276 obtained by multiplying the first power amount 274 by the second coefficient α2.

[0033] When the initial SOC 272 of the storage battery 160 on the power transfer date is smaller than the reference SOC 273, the second amount of power 275 of the thick solid line, which is a value smaller than the first amount of power 274 of the thin solid line, is adopted as the amount of power predicted on the power transfer date. Therefore, compared to the case of adopting the first amount of power 274 of the thin solid line, it is possible to allocate the amount of power D1, which is the difference between the first amount of power 274 of the thin solid line and the second amount of power 275 of the thick solid line, to the charging of the storage battery 160. In other words, since the actual value of the amount of power of the PV power generation facility 140 on the power transfer date is more likely to be larger than the planned value (second amount of power 275) of the amount of power of the PV power generation facility 140 on the power trading date, even if an excess imbalance occurs on the power transfer date, it is possible to avoid the excess imbalance by charging the storage battery 160 with the amount of power D1.

[0034] When the initial SOC272 of the storage battery 160 on the power delivery date is smaller than the reference SOC273, the charge / discharge plan creation device 100 creates a first charge / discharge plan 277 in which a number of charging frames in which charging is planned and a number of discharging frames in which discharging is planned are assigned to any of the 48 frames on the power delivery date based on the power price on the power delivery date predicted by the power price prediction device 120 and the second amount of power 275.

[0035] On the other hand, when the initial SOC 272 of the storage battery 160 on the power transfer date is greater than the reference SOC 273, the third amount of power 276 of the thick dashed line, which is greater than the first amount of power 274 of the thin solid line, is adopted as the amount of power predicted on the power transfer date. Therefore, compared to the case of adopting the first amount of power 274 of the thin solid line, it is possible to allocate the amount of power D2, which is the difference between the first amount of power 274 of the thin solid line and the third amount of power 276 of the thick dashed line, to the discharge of the storage battery 160. In other words, since the actual value of the amount of power of the PV power generation facility 140 on the power transfer date is more likely to be smaller than the planned value of the amount of power of the PV power generation facility 140 on the power trading date (the third amount of power 276 of the thick dashed line), even if a shortage imbalance occurs on the power transfer date, it is possible to avoid the shortage imbalance by discharging the amount of power including the amount of power D2 from the storage battery 160. When the initial SOC272 of the storage battery 160 on the power delivery date is greater than the reference SOC273, the charge / discharge plan creation device 100 creates a second charge / discharge plan 278 in which a number of charging frames in which charging is planned and a number of discharging frames in which discharging is planned are assigned to any of the 48 frames on the power delivery date based on the power price on the power delivery date predicted by the power price prediction device 120 and the third amount of power 276.

[0036] FIG. 3 is a block diagram showing an outline of the functions of the charge and discharge plan creation device 100. As shown in FIG.

[0037] The charge / discharge plan creation device 100 includes an input unit 210, an initial SOC calculation unit 220 (prediction unit), a reference SOC setting unit 230, an SOC comparison unit 240 (comparison unit), a charge / discharge plan creation unit 250, an output unit 260, and a memory unit 270 as means for realizing the above functions.

[0038] The memory unit 270 stores a control program 271, an initial SOC 272, a reference SOC 273, a first coefficient α1, a second coefficient α2, a first amount of power 274, a second amount of power 275, a third amount of power 276, a first charge / discharge plan 277, and a second charge / discharge plan 278.

[0039] The control program 271 is a program that is executed when the charge and discharge plan creation device 100 is operated.

[0040] The initial SOC 272 is the SOC of the storage battery 160 at the time (e.g., sunrise) when the PV power generation facility 140 is first able to generate power on the power delivery day. The initial SOC 272 is calculated by the initial SOC calculation unit 220 and stored in the storage unit 270 in a time period before spot bidding on the power trading day.

[0041] The reference SOC 273 is the SOC of the storage battery 160 to be compared with the initial SOC 272, and in this embodiment, the reference SOC 273 is set to, for example, 50% so that the initial SOC 272 can easily determine whether the storage battery 160 has a margin for charging or discharging when the storage battery 160 is charged or discharged on the power delivery day. The reference SOC 273 is stored in the storage unit 270 before the initial SOC calculation unit 220 calculates the initial SOC 272. The reference SOC 273 can be appropriately set to a value other than 50% depending on the specifications of the storage battery 160, aging deterioration, and the like.

[0042] The first coefficient α1 is a coefficient less than 1 to be multiplied by the first energy 274, which is the total energy of the PV power generation equipment 140 on the power delivery date predicted by the energy prediction device 130 in the time period before the spot bidding on the power trading day, when the initial SOC 272 is smaller than the reference SOC 273. The first coefficient α1 is calculated, for example, by the following formula (1) and is stored in advance in the storage unit 270.

[0043] α1={first power amount 274-(initial SOC 272-reference SOC 273) / PCS efficiency of storage battery 160} / first power amount 274 (1) The second coefficient α2 is a coefficient greater than 1 by which the first power amount 274 on the power delivery date of the PV power generation facility 140 predicted by the power amount prediction device 130 in the time period before the spot bidding on the power trading day is multiplied when the initial SOC 272 is greater than the reference SOC 273. The second coefficient α2 is calculated, for example, by the following formula (2) and is stored in advance in the storage unit 270.

[0044] α2 = {first power amount 274 + (initial SOC 272 - reference SOC 273) × PCS efficiency of storage battery 160} / first power amount 274 (2) The PCS efficiency of the storage battery 160 is the power conversion efficiency of the power conditioner 161, and is the ratio of output power to input power when the power charged in the storage battery 160 is converted from DC to AC when the power charged in the storage battery 160 is discharged to the power grid 180, and when the power from the power grid 180 is charged in the storage battery 160, the power from the power grid 180 is converted from AC to DC.

[0045] The first amount of power 274 is stored in the storage unit 270 when the power amount prediction device 130 predicts the first amount of power 274.

[0046] The second amount of power 275 is stored in the storage unit 270 when the first coefficient multiplier 251 calculates the second amount of power 275 by multiplying the first amount of power 274 by the first coefficient α1.

[0047] The third amount of power 276 is stored in the storage unit 270 when the second coefficient multiplying unit 252 calculates the third amount of power 276 by multiplying the first amount of power 274 by the second coefficient α2.

[0048] The first charge / discharge plan 277 is stored in the memory unit 270 when the charge / discharge plan creation unit 250 creates the first charge / discharge plan 277 based on the power price on the power delivery date predicted by the power price prediction device 120 and the second amount of power 275 when the initial SOC 272 of the storage battery 160 on the power delivery date is smaller than the reference SOC 273.

[0049] The second charge / discharge plan 278 is stored in the memory unit 270 when the charge / discharge plan creation unit 250 creates the second charge / discharge plan 278 based on the power price on the power delivery date predicted by the power price prediction device 120 and the third amount of power 276 when the initial SOC 272 of the storage battery 160 on the power delivery date is greater than the reference SOC 273.

[0050] The input unit 210 receives data indicating an operation start command that triggers the charge / discharge plan creation device 100 to start operation, the electricity price on the electricity delivery date predicted by the electricity price prediction device 120, the first electricity amount 274 of the storage battery 160 on the electricity delivery date predicted by the electricity amount prediction device 130, etc.

[0051] The initial SOC calculation unit 220 calculates the initial SOC by using a predicted value A of the amount of power of the PV power generation facility 140 up to the time of the spot bidding on the power trading day predicted by the power amount prediction device 130, a planned value B of the amount of power spot-bid on the day before the power trading day, and the charged amount of the storage battery 160 at the time of the spot bidding on the power trading day. Σ(Forecast value A - Planned value B) + Charge amount of storage battery 160 at the time of spot bidding on the electricity trading day (3) The final SOC of the storage battery 160 on the day of the power transaction is calculated by the above.

[0052] Furthermore, the initial SOC calculation unit 220 sets the initial SOC 272 to an SOC that indicates a value that is less than the final SOC of the storage battery 160 on the calculated power transaction date by the amount of power that will be self-discharged by the time the storage battery 160 is first able to be charged on the power delivery date.

[0053] The reference SOC setting unit 230 sets a reference SOC 273 to be compared with the initial SOC 272. The ratio of the reference SOC 273 is set at this point.

[0054] The SOC comparator 240 compares the initial SOC 272 with the reference SOC 273 .

[0055] The charge and discharge plan creation unit 250 includes a first coefficient multiplication unit 251 and a second coefficient multiplication unit 252.

[0056] When the comparison result of SOC comparison section 240 indicates that initial SOC 272 is smaller than reference SOC 273, first coefficient multiplication section 251 multiplies first power amount 274 by first coefficient α1 to calculate second power amount 275 having a value smaller than first power amount 274. On the other hand, when the comparison result of SOC comparison section 240 indicates that initial SOC 272 is larger than reference SOC 273, second coefficient multiplication section 252 multiplies first power amount 274 by second coefficient α2 to calculate third power amount 276 having a value larger than first power amount 274.

[0057] When the initial SOC 272 is smaller than the reference SOC 273, the charge / discharge plan creation unit 250 creates a first charge / discharge plan 277 based on the power price on the power delivery date predicted by the power price prediction device 120 and a second amount of power 275. On the other hand, when the initial SOC 272 is larger than the reference SOC 273, the charge / discharge plan creation unit 250 creates a second charge / discharge plan 278 based on the power price on the power delivery date predicted by the power price prediction device 120 and a third amount of power 276.

[0058] The output unit 260 reads out the first charge / discharge plan 277 or the second charge / discharge plan 278 stored in the storage unit 270 , and outputs it to the battery control device 150 via the communication network 170 .

[0059] The storage battery control device 150 acquires the first charge / discharge plan 277 or the second charge / discharge plan 278, and controls the charge / discharge operation of the storage battery 160 so that the storage battery 160 charges and discharges in accordance with the first charge / discharge plan 277 or the second charge / discharge plan 278.

[0060] FIG. 4 is a block diagram showing an example of hardware of an information processing device 10 that realizes the function of the charge / discharge plan creation device 100 shown in FIG. 3. The information processing device 10 includes a processor 11, a main storage device 12, an auxiliary storage device 13, an input device 14, an output device 15, and a communication device 16. The information processing device 10 is, for example, a personal computer, an office computer, various server devices, a general-purpose machine, or the like. The information processing device 10 may be realized in whole or in part using virtual information processing resources provided using a virtualization technology, such as a virtual server provided by a cloud system. The charge / discharge plan creation device 100 may be realized using a plurality of information processing devices 10 that are communicably connected.

[0061] The processor 11 is configured using, for example, a Central Processing Unit (CPU), a Micro Processing Unit (MPU), a Graphics Processing Unit (GPU), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Artificial Intelligence (AI) chip, etc.

[0062] The main memory device 12 is a device that stores programs and data, and is, for example, a Read Only Memory (ROM), a Random Access Memory (RAM), or a non-volatile memory (Non Volatile RAM (NVRAM)).

[0063] The auxiliary storage device 13 is, for example, a solid state drive (SSD), a hard disk drive, an optical storage device (such as a compact disc (CD) or a digital versatile disc (DVD)), a storage system, a reading / writing device for a recording medium such as an IC card, an SD card, or an optical recording medium, a storage area of ​​a cloud server, etc. Programs and data can be read into the auxiliary storage device 13 via a recording medium reading device or a communication device 16. The programs and data stored in the auxiliary storage device 13 are read into the main storage device 12 as needed.

[0064] The input device 14 is an interface that accepts input from the outside, and is, for example, a keyboard, a mouse, a touch panel, a card reader, a pen-input tablet, a voice input device, or the like.

[0065] The output device 15 is an interface that outputs various information such as the progress of processing and the results of processing. The output device 15 is, for example, a display device (LCD (Liquid Crystal Display), a graphic card, etc.) that visualizes the various information described above, a device that converts the various information described above into voice (voice output device (speaker, etc.)), or a device that converts the various information described above into text (printer, etc.). The information processing device 10 may be configured to input and output information to and from other devices via the communication device 16.

[0066] The input device 14 and the output device 15 constitute a user interface for receiving information from the user and presenting information.

[0067] The communication device 16 is a device that realizes communication (wired communication or wireless communication) with other devices via a communication infrastructure such as a communication network 5, and is configured using, for example, a NIC (Network Interface Card), a wireless communication module, a USB module, etc.

[0068] In addition, the information processing device 10 may be implemented with, for example, an operating system, a file system, a DBMS (Data Base Management System) (relational database, NoSQL, etc.), a KVS (Key-Value Store), etc.

[0069] The functions of the charge / discharge plan creation device 100 are realized by the processor 11 of the information processing device 10 reading and executing a control program stored in the main storage device 12, or by the functions of the hardware (FPGA, ASIC, AI chip, etc.) constituting the charge / discharge plan creation device 100. For example, the functions of the initial SOC calculation unit 220, the reference SOC setting unit 230, the SOC comparison unit 240, and the charge / discharge plan creation unit 250 are realized by the processor 11, the storage unit 290 is realized by the main storage device 12 and the auxiliary storage device 13, the input unit 210 is realized by the input device 14, and the output unit 260 is realized by the output device 15.

[0070] Fig. 5 is a flowchart showing an example of a process when the charge and discharge plan creation device 100 creates a charge and discharge plan. Note that the process in Fig. 5 is performed before spot bidding for power trading on the power trading day.

[0071] First, when an operation start command for causing the charge and discharge plan creation device 100 to start operation is input to the input unit 210 (S1010: YES), the input of the operation start command triggers the processing of step S1020 and subsequent steps.

[0072] The reference SOC setting unit 230 sets a reference SOC 273 to be compared with the initial SOC 272 (S1020). The reference SOC 273 is stored in the storage unit 270.

[0073] The initial SOC calculation unit 220 calculates the final SOC of the storage battery 160 on the power transaction day according to the above formula (3). Furthermore, the initial SOC calculation unit 220 calculates an SOC that indicates that the calculated final SOC of the storage battery 160 on the power transaction day is less than the amount of power that the storage battery 160 will self-discharge until the time when the storage battery 160 is first able to charge on the power delivery day, and sets this SOC as the initial SOC 272 (S1030). This initial SOC 272 is stored in the storage unit 270.

[0074] The SOC comparison unit 240 reads out the initial SOC 272 and the reference SOC 273 stored in the storage unit 270, and compares the initial SOC 272 with the reference SOC 273 (S1040).

[0075] If the comparison result by the SOC comparison unit 240 indicates that the initial SOC 272 is smaller than the reference SOC 273 (S1040: YES), the first coefficient multiplication unit 251 multiplies the first amount of power 274 on the power delivery date generated by the PV power generation equipment 140 predicted by the power amount prediction device 130 by a first coefficient α1 less than 1, and calculates a second amount of power 275 smaller than the first amount of power 274 (S1050).

[0076] The charge / discharge plan creation unit 250 creates a first charge / discharge plan 277 based on the power price on the power delivery date predicted by the power price prediction device 120 and the second amount of power 275 (S1060).

[0077] On the other hand, if the comparison result by the SOC comparison unit 240 indicates that the initial SOC 272 is greater than the reference SOC 273 (S1040: YES), the second coefficient multiplication unit 252 multiplies the first amount of power 274 on the power delivery date generated by the PV power generation equipment 140 predicted by the power amount prediction device 130 by a second coefficient α2 greater than 1, and calculates a third amount of power 276 greater than the first amount of power 274 (S1070).

[0078] The charge / discharge plan creation unit 250 creates a second charge / discharge plan 278 based on the power price on the power delivery date predicted by the power price prediction device 120 and the third amount of power 276 (S1080).

[0079] As described above, the charge / discharge plan creation device 100 creates a charge / discharge plan on an electricity trading day for the storage battery 160 that charges the storage battery 160 with electricity generated by the PV power generation facility 140 that uses solar energy and discharges the charged electricity, and includes an initial SOC calculation unit 220 that predicts an initial SOC 272 of the storage battery 160 before the PV power generation facility 140 starts generating electricity on, for example, the electricity delivery day that is the next day of the electricity trading day, before bidding for electricity trading based on the charge / discharge plan on the electricity trading day, an SOC comparison unit 240 that compares the initial SOC 272 with a reference SOC 273 that is a preset value, and a SOC calculation unit 250 that compares the initial SOC 272 with a reference SOC 273 that is a preset value, and a charge / discharge plan creation device 260 that creates a charge / discharge plan on an electricity trading day for the storage battery 160. and a charge / discharge plan creation unit 250 which, when the comparison result of the OC comparison unit 240 indicates that the initial SOC 272 is smaller than the reference SOC 273, creates a first charge / discharge plan 277 based on a second amount of power 275 smaller than a first amount of power 274 predicted to be generated by the PV power generation equipment 140 on the power delivery date, and, when the comparison result of the SOC comparison unit 240 indicates that the initial SOC 272 is larger than the reference SOC 273, creates a second charge / discharge plan 278 based on a third amount of power 276 larger than the first amount of power 274 predicted to be generated by the PV power generation equipment 140 on the power delivery date.

[0080] According to the charge / discharge plan creation device 100, when bidding is made according to the first charge / discharge plan 277 on the power trading day, it becomes more likely that the actual value of the amount of power of the PV power generation facility 140 on the power transfer day will be greater than the planned value of the amount of power of the PV power generation facility 140 on the power trading day, so it becomes possible to avoid an excess imbalance that occurs on the power transfer day by charging the storage battery 160. Also, when bidding is made according to the second charge / discharge plan 278 on the power trading day, it becomes more likely that the actual value of the amount of power of the PV power generation facility 140 on the power transfer day will be less than the planned value of the amount of power of the PV power generation facility 140 on the power trading day, so it becomes possible to avoid an insufficient imbalance that occurs on the power transfer day by discharging the storage battery 160.

[0081] In addition, in the charge / discharge plan creation device 100, the first charge / discharge plan 277 is created based on a second amount of power 275 obtained by multiplying a first amount of power 274 predicted to be generated by the PV power generation equipment 140 on the power delivery date by a first coefficient α1 that is less than 1.

[0082] According to the charge / discharge plan creation device 100, by simply setting the first coefficient α1 to a predetermined value less than 1, it is possible to increase the possibility that the actual value of the amount of power of the PV power generation equipment 140 on the power delivery date will be greater than the planned value of the amount of power of the power generation equipment on the power trading date.

[0083] In addition, in the charge and discharge schedule creation device 100, the first coefficient α1 is a value that is set based on a value obtained by dividing the difference between the initial SOC 272 and the reference SOC 273 by the PCS efficiency in the power conditioner 161 of the storage battery 160.

[0084] According to the charge / discharge plan creation device 100, the first coefficient α1 is set based on information specific to the storage battery 160 used, so it is possible to reliably increase the possibility that the actual value of the amount of power of the PV power generation equipment 140 on the power delivery date will be greater than the planned value of the amount of power of the PV power generation equipment 140 on the power trading date.

[0085] In addition, in the charge / discharge plan creation device 100, the second charge / discharge plan 278 is created based on a third amount of power 276 obtained by multiplying the first amount of power 274 predicted to be generated by the PV power generation equipment 140 on the power delivery date by a second coefficient α2 greater than 1.

[0086] According to the charge / discharge plan creation device 100, by simply setting the second coefficient α2 to a predetermined value greater than 1, it is possible to increase the possibility that the actual value of the amount of power of the PV power generation facility 140 on the power delivery date will be smaller than the planned value of the amount of power of the PV power generation facility 140 on the power trading date.

[0087] In addition, in the charge and discharge schedule creation device 100, the second coefficient α2 is a value that is set based on a value obtained by multiplying the difference between the initial SOC 272 and the reference SOC 273 by the PCS efficiency in the power conditioner 161 of the storage battery 160.

[0088] According to the charge / discharge plan creation device 100, the second coefficient α2 is set based on information specific to the storage battery 160 to be used, so it is possible to reliably increase the possibility that the actual value of the amount of power of the PV power generation equipment 140 on the power delivery date will be smaller than the planned value of the amount of power of the PV power generation equipment 140 on the power trading date.

[0089] It should be noted that the present embodiment is provided to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and equivalents thereof are also included in the present invention. [Explanation of symbols]

[0090] 1. Power generation system 10. Information processing device 11 Processors 12 Main storage 13 Auxiliary storage device 14 Input Devices 15 Output Devices 16 Communication Equipment 100 Charging and discharging plan creation device 110 Weather information providing device 120 Electricity price forecasting device 130 Electricity forecasting device 140 PV power generation facilities 141,161 Power conditioner 150 Battery control device 160 Battery 170 Communication Network 180 Power system 210 Input section 220 Initial SOC calculation section 230 Standard SOC setting section 240 SOC comparison section 250 Charging and Discharging Planning Department 251 First coefficient multiplication unit 252 Second coefficient multiplier 260 Output section 270 Storage section

Claims

1. A charge / discharge plan creation device that creates a charge / discharge plan on an electricity trading day for a storage battery that charges electricity generated by a renewable energy power generation facility and discharges the charged electricity, a prediction unit that predicts an initial SOC (State Of Charge) of a storage battery before the power generation facility starts generating power on a power delivery date after the power trading date, before bidding for the power trading based on the charge and discharge plan on the power trading date; a comparison unit that compares the initial SOC with a reference SOC that is a preset value; a charge / discharge plan creation unit that creates a first charge / discharge plan based on an amount of power smaller than an amount of power predicted to be generated by the power generation facility on the power delivery date when the comparison result of the comparison unit indicates that the initial SOC is smaller than the reference SOC, and creates a second charge / discharge plan based on an amount of power larger than an amount of power predicted to be generated by the power generation facility on the power delivery date when the comparison result of the comparison unit indicates that the initial SOC is larger than the reference SOC; A charge and discharge plan creation device comprising:

2. The charge / discharge plan creation device according to claim 1, The first charge / discharge plan is created based on an amount of power predicted to be generated by the power generation facility on the power delivery date multiplied by a first coefficient less than 1. Charging and discharging plan creation device.

3. The charge / discharge schedule creation device according to claim 2, The first coefficient is a value that is set based on a difference between the initial SOC and the reference SOC divided by a DC / AC conversion efficiency in a power conditioner of the storage battery. Charging and discharging plan creation device.

4. The charge / discharge schedule creation device according to claim 2, The second charge / discharge plan is created based on an amount of power predicted to be generated by the power generation facility on the power delivery date multiplied by a second coefficient greater than 1. Charging and discharging plan creation device.

5. The charge / discharge schedule creation device according to claim 4, The second coefficient is a value that is set based on a value obtained by multiplying a difference between the initial SOC and the reference SOC by a DC / AC conversion efficiency in a power conditioner of the storage battery. Charging and discharging plan creation device.

6. A charge / discharge plan creation method for a charge / discharge plan creation device that creates a charge / discharge plan on an electricity trading day for a storage battery that charges electricity generated by a renewable energy power generation facility and discharges the charged electricity, comprising: a first step of predicting an initial SOC (State Of Charge) of a storage battery before the power generation facility starts generating power on a power delivery date after the power trading date, before bidding for the power trading based on the charge / discharge plan on the power trading date; A second step of comparing the initial SOC with a reference SOC that is a preset value; a third step of creating a first charge / discharge plan based on an amount of power smaller than the amount of power predicted to be generated by the power generation facility on the power delivery date when the initial SOC is smaller than the reference SOC in the second step, and creating a second charge / discharge plan based on an amount of power larger than the amount of power predicted to be generated by the power generation facility on the power delivery date when the initial SOC is larger than the reference SOC in the second step; A method for creating a charge and discharge plan including the above.

7. The charge / discharge schedule creation method according to claim 6, The first charge / discharge plan is created based on an amount of power predicted to be generated by the power generation facility on the power delivery date multiplied by a first coefficient less than 1. How to create a charging and discharging plan.

8. The charge / discharge schedule creation method according to claim 7, The first coefficient is a value that is set based on a value obtained by dividing the difference between the initial SOC and the reference SOC by a conversion efficiency of a power conditioner of the storage battery. How to create a charging and discharging plan.

9. The charge / discharge schedule creation method according to claim 7, The second charge / discharge plan is created based on an amount of power predicted to be generated by the power generation facility on the power delivery date multiplied by a second coefficient greater than 1. How to create a charging and discharging plan.

10. The charge / discharge schedule creation method according to claim 9, The second coefficient is a value that is set based on a value obtained by multiplying a difference between the initial SOC and the reference SOC by a conversion efficiency of a power conditioner of the storage battery. How to create a charging and discharging plan.

11. A computer of a charge / discharge plan creation device that creates a charge / discharge plan on an electricity trading day for a storage battery that charges electricity generated by a renewable energy power generation facility and discharges the charged electricity, a first process for predicting an initial SOC (State Of Charge) of a storage battery before the power generation facility starts generating power on a power delivery date after the power trading date, before bidding for the power trading based on the charge / discharge plan on the power trading date; A second process of comparing the initial SOC with a reference SOC that is a preset value; a third process for creating a first charge / discharge plan based on an amount of power smaller than the amount of power predicted to be generated by the power generation facility on the power delivery date when the initial SOC is smaller than the reference SOC in the second process, and creating a second charge / discharge plan based on an amount of power larger than the amount of power predicted to be generated by the power generation facility on the power delivery date when the initial SOC is larger than the reference SOC in the second process; A program that executes the following.

Images