Charging and discharging time determination device, charging and discharging time determination method, and program

Abstract

To enable charging and discharging for avoiding an imbalance of an excess or a shortage of a power storage battery.SOLUTION: A charging and discharging time determination device that acquires a charging and discharging plan of a power storage battery containing a plurality of charging tops and a plurality of discharging tops, comprises: a prediction unit that predicts an SOC in a predetermined time of the power storage battery at a power delivery date that is a power transaction date and thereafter; and a deletion unit that deletes a charging plan of each charging top in order that a difference between an imbalance prediction value and a spot bid price is large at a power delivery date so that the SOC at a predetermined time of the power storage battery becomes smaller than a first value when it is predicted that the SOC in the predetermined time of the power storage battery becomes larger than the first value, at a power delivery date, and deletes a discharging plan of each discharge top in order that the difference between the imbalance prediction value and the spot bid price becomes smaller so that the SOC in the predetermined time of the power storage battery becomes larger than a second value that is smaller than the first value when it is predicted that the SOC in the predetermined time of the power storage battery becomes smaller than the second value.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a charge / discharge time determination device, a charge / discharge time determination method, and a program that change the charge / discharge time in a charge / discharge plan for a storage battery on an electricity delivery date after an electricity trading date so that the storage battery can perform charging and discharging that avoids surplus imbalance and deficiency imbalance. [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 shifting 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 already spot-bid on the electricity trading day (spot bidding day) and the actual value of the amount of electricity actually generated by the power generation facility on, for example, the electricity delivery day the day after the electricity trading day, by combining the power generation facility with a storage battery, and when surplus imbalance occurs, charging the surplus amount of electricity into the storage battery, and when shortage imbalance occurs, discharging the shortage amount of electricity 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, for example, if an surplus imbalance occurs continuously, in which the actual amount of power in the power generation equipment is greater than the planned amount of power, the SOC of the storage battery will reach its upper limit and the storage battery will be unable to charge the surplus amount of power. Alternatively, if a shortage imbalance occurs continuously, in which the actual amount of power in the power generation equipment is smaller than the planned amount of power, the SOC of the storage battery will reach its lower limit and the storage battery will be unable to discharge the shortage amount of power. As a result, there is a risk that surplus imbalance and shortage imbalance cannot be avoided by just charging and discharging the storage 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 time determination device, a charge / discharge time determination method, and a program that enable a storage battery to charge and discharge in a way that avoids surplus imbalance and deficiency imbalance. [Means for solving the problem]

[0006] One of the present inventions for achieving the above object is a charge / discharge time determination device that acquires a charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that uses renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, the charge / discharge time determination device acquiring the charge / discharge plan for a storage battery on an electricity trading day or later, the charge / discharge time determination device acquiring the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery, the charge / discharge time determination device determining a state of charge (SOC) of the storage battery at a predetermined time on an electricity delivery day after the electricity trading day. and a deletion unit that, when it is predicted that the SOC of the storage battery at the specified time on the power delivery date will be greater than a first value, deletes the charging plans of the charging units in order of largest difference between the imbalance prediction price on the power delivery date and the spot bid price based on the charge and discharge plan so that the SOC of the storage battery at the specified time will be smaller than the first value, and, when it is predicted that the SOC of the storage battery at the specified time will be smaller than a second value that is smaller than the first value, deletes the discharging plans of the discharging units in order of smallest difference between the imbalance prediction price and the spot bid price so that the SOC of the storage battery at the specified time will be larger than the second value.

[0007] Another aspect of the present invention for achieving the above object is a charge / discharge time determination device that acquires a charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, the charge / discharge time determination device acquiring the charge / discharge plan for a storage battery on an electricity trading day or later, the charge / discharge time determination device acquiring the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery, the charge / discharge time determination device acquiring the charge / discharge plan for a storage battery on an electricity transfer day after the electricity trading day, the charge / discharge time determination device acquiring the charge / discharge plan for a storage battery on an electricity trading day or later, and a deletion unit that deletes charging plans in the charging frames in order of highest imbalance prediction price on the power delivery date so that the SOC of the storage battery at the specified time becomes smaller than the first value when the SOC of the storage battery at the specified time on the power delivery date is predicted to be greater than a first value, and deletes discharging plans in the discharging frames in order of lowest imbalance prediction price when the SOC of the storage battery at the specified time is predicted to be smaller than a second value that is smaller than the first value so that the SOC of the storage battery at the specified time becomes larger than the second value.

[0008] According to the charge / discharge time determination device of the present invention, at least a part of the charging plan or discharging plan of the storage battery is deleted so that the SOC of the storage battery at a predetermined time becomes a value between a first value and a second value. Therefore, even if an excess imbalance or a shortage imbalance occurs continuously, the storage battery can be charged and discharged so as to avoid the excess imbalance or the shortage imbalance. The predetermined time can be set to, for example, the time when the power generation facility goes from being able to generate power to being unable to generate power. For example, when the power generation facility uses solar light as a renewable energy, the predetermined time can be the time of sunset.

[0009] Another aspect of the present invention for achieving the above object is a charge / discharge time determination device, wherein the prediction unit predicts the SOC of the storage battery at a specified time based on a predicted value of the amount of power of the power generation equipment on the power delivery date and a planned value of the amount of power for spot bidding based on the charge / discharge plan.

[0010] According to the charge / discharge time determination device of the present invention, it is possible to accurately predict the SOC of the storage battery at a given time.

[0011] 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

[0012] According to the present invention, at least a portion of the charging plan or discharging plan for the storage battery is deleted so that the SOC of the storage battery at a specified time becomes a value between a first value and a second value, so that it is possible to charge or discharge the storage battery so as to avoid surplus imbalance or deficiency imbalance. [Brief description of the drawings]

[0013] [Figure 1] 1 is a block diagram showing a schematic configuration of a power generation system 1 including a charge / discharge time determination device 100. FIG. [Diagram 2] 13 is a graph showing an example of the relationship between the predicted value of the electricity price by the electricity price prediction device 130, the predicted value of the amount of electricity by the electricity amount prediction device 150, the planned value of the charge amount of the storage battery 180 in the charging frames C1 to C10, and the planned value of the discharge amount of the storage battery 180 in the discharging frames D1 to D7 on an electricity trading day when the charge and discharge plan of the storage battery 180 is applied. [Diagram 3] 1 is a block diagram showing an outline of functions of a charge / discharge time determination device 100. FIG. [Figure 4] 13 is a graph showing an example of the relationship between the spot bidding price placed on an electricity trading day according to a charge / discharge plan for the storage battery 180 and the imbalance predicted price on the electricity delivery day obtained from the imbalance price prediction device 140. [Diagram 5] 1 is a block diagram showing an example of hardware of an information processing device 10 that realizes the functions of a charge / discharge time determination device 100. FIG. [Figure 6] 10 is a flowchart showing an example of a process performed by the charge / discharge time determination device 100 when deleting, in accordance with priority order, a charging plan of a charging frame and a discharging plan of a discharging frame included in a charge / discharge plan. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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.

[0015] 1 is a block diagram showing a schematic configuration of a power generation system 1 including a charge / discharge time determination 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)) 160 that generates power by using sunlight.

[0016] The power generation system 1 includes a charge / discharge time determination device 100, a charge / discharge plan creation device 110, a weather information providing device 120, a power price prediction device 130, an imbalance price prediction device 140, an energy prediction device 150, a PV power generation facility 160, a battery control device 170, and a battery 180.

[0017] The charge / discharge time determination device 100, the charge / discharge plan creation device 110, the weather information providing device 120, the power price prediction device 130, the imbalance price prediction device 140, the power amount prediction device 150, the PV power generation facility 160, the storage battery control device 170, and the storage battery 180 are connected in a communicable state via a communication network 190. The communication network 190 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 190, the PV power generation facility 160 is also connected to a power system 195 operated by a general power transmission and distribution company, etc.

[0018] The PV power generation facility 160 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 160 also includes a power conditioner (PCS: Power Conditioning Subsystem) 161 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 195. The power generated by the PV power generation facility 160 is either supplied to the power grid 195 via the power conditioner 161 (sold to a general power transmission and distribution company) or supplied to the storage battery 180 (charged to the storage battery 180). In this embodiment, the amount of power generated by the PV power generation facility 160 is planned to be supplied to the storage battery 180 in multiple charging frames included in the charge and discharge plan on the power trading day, which is the spot bidding day.

[0019] The storage battery 180 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 180 includes a power conditioner (PCS) 181 for charging and discharging between the storage battery 180 and a power grid 195.

[0020] The weather information providing device 120 provides the electricity price prediction device 130, the imbalance price prediction device 140, and the electricity amount prediction device 150 with weather information (e.g., temperature, solar radiation, etc.) for the region where the PV power generation facility 160 is installed on the electricity delivery day following the electricity trading day. 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 120 may obtain the above weather information from a meteorological observation station for the region where the PV power generation facility 160 is installed, or may obtain the above weather information from a weather information providing server managed by the Japan Meteorological Agency.

[0021] The power price prediction device 130 refers to the weather information acquired from the weather information providing device 120 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 130 predicts the power price for each frame. As a method for the power price prediction device 130 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 130 may also acquire a predicted value of the power price published by a third party via the communication network 190 or the Internet.

[0022] The power generation company compares the planned value of the amount of energy for 48 frames that was spot-bid on the power trading day, the day before the power delivery date, according to the charging and discharging plan of the storage battery 180, with the actual value of the amount of energy for 48 frames that the PV power generation facility 160 actually generated on the power trading day. For example, if the actual value of the amount of energy is greater than the planned value of the amount of energy, a surplus imbalance occurs. If the surplus amount of energy cannot be absorbed by charging the storage battery 180, the power generation company sells the amount of energy that cannot be absorbed by charging the storage battery 180 to the general power transmission and distribution company and pays a surplus imbalance fee. On the other hand, if the actual value of the amount of energy is smaller than the planned value of the amount of energy, a shortage imbalance occurs. If the supply of the shortage of energy cannot be covered by discharging the storage battery 180, the power generation company purchases the amount of energy that cannot be covered by discharging the storage battery 180 from the general power transmission and distribution company and pays a shortage imbalance fee. For this reason, in the charge / discharge time determination device 100, when an excess imbalance occurs, the storage battery 180 charges the excess amount of power, thereby avoiding the excess imbalance, and when a shortage imbalance occurs, the storage battery 180 discharges the shortage amount of power, thereby avoiding the shortage imbalance. In order to do so, the charge / discharge time of the storage battery 180 on the power delivery date is changed by selectively deleting charging frames and discharging frames from the charging / discharging plan for which spot bidding has already been made, so that the SOC predicted value 295 of the storage battery 180 at the second predetermined time on the power delivery date becomes a value between the SOC upper limit value 292 and the SOC lower limit value 293 set in advance. In this embodiment, the second predetermined time is, for example, the time of "sunset" (for example, 5 p.m.), which is the time when the PV power generation facility 160 changes from a state in which it is capable of generating power to a state in which it is unable to generate power. Here, when selectively deleting charging frames and discharging frames from the charging / discharging plan for which spot bidding has already been made as described above, it is necessary to predict the excess imbalance price and the shortage imbalance price for each of the 48 frames on the power delivery date. In this embodiment, for ease of explanation, the predicted surplus imbalance price and shortage imbalance price are assumed to be the same price, and the predicted surplus imbalance price and shortage imbalance price are referred to as "imbalance predicted price." The imbalance price prediction device 140 calculates the imbalance predicted price for 48 frames on the power delivery date, based on the weather information on the power delivery date provided by the weather information providing device 120 and the power prices (power selling price and power purchasing price) on the power delivery date provided by the power price prediction device 130. The imbalance price prediction device 140 may calculate the imbalance predicted price by combining analysis techniques such as artificial intelligence.

[0023] The power amount prediction device 150 predicts the amount of power (MWh) generated by the PV power generation facility 160 for each frame based on the weather information acquired from the weather information providing device 120 for the power delivery date, the location information (latitude, longitude, etc.) of the PV power generation facility 160, 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 150 to predict the amount of power generated by the PV power generation facility 160, 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 160, 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 actual values ​​of the amount of power generated can be used.

[0024] The charge / discharge plan creation device 110 acquires a predicted value of the power price from the power price prediction device 130 for the power trading day on which spot bidding is conducted, and acquires a predicted value of the amount of power generated by the PV power generation facility 160 from the power amount prediction device 150, and creates a charge / discharge plan based on the predicted value of the power price and the predicted value of the amount of power generated by adjusting the charge amount in a plurality of charging frames included in a charging time period in which the predicted value of the power price is relatively low and the discharge amount in a plurality of discharging frames included in a discharging time period in which the predicted value of the power price is relatively high so that the power selling price (power selling revenue) becomes the highest. Note that, as shown in FIG. 2 described later, the plurality of charging frames are ten charging frames C1 to C10 included in the above-mentioned charging time period, and the plurality of discharging frames are seven discharging frames D1 to D7 included in the above-mentioned discharging time period.

[0025] FIG. 2 is a graph showing an example of the relationship between the predicted value of the electricity price by the electricity price prediction device 130, the predicted value of the electricity amount by the electricity amount prediction device 150, the planned value of the charge amount of the storage battery 180 in the charging frames C1 to C10, and the planned value of the discharge amount of the storage battery 180 in the discharging frames D1 to D7 on an electricity trading day.

[0026] 2, the scale on the horizontal axis indicates time in 30-minute increments (1 frame increments) in one day, the scale on the vertical axis on the left side indicates the power output in 0.5 MWh increments in the PV power generation facility 160, and the scale on the vertical axis on the right side indicates the power price in 5 yen / kW increments in the market where power is bought and sold. Also in Fig. 2, the dashed-dotted line indicates the predicted value of the power price on the power trading day, the dashed-two-dotted line indicates the predicted value of the amount of power generated by the PV power generation facility 160 on the power trading day, the black line extending vertically indicates the planned value of the charge amount of the storage battery 180 in the charging frames C1-C10 included in the charging time slot, and the white line extending vertically indicates the planned value of the discharge amount of the storage battery 180 in the discharging frames D1-D7 included in the discharging time slot. In this embodiment, the charging time slot is from 9:30 to 14:00 when the predicted value of the power price is, for example, 20 yen / kW or less, and the discharging time slot is from 16:00 to 19:00 when the predicted value of the power price is, for example, 23 yen / kW or more. The charging time slot includes ten charging frames C1 to C10 by dividing the time period from 9:30 to 14:00 into 30-minute units, and the discharging time slot includes seven discharging frames D1 to D7 by dividing the time period from 16:00 to 19:00 into 30-minute units.

[0027] In FIG. 2, on an electricity trading day, a discharging time slot is set after a charging time slot, but if the predicted value of the electricity price rises to 23 yen or more during the charging time slot or falls to 20 yen or less during the discharging time slot, a discharging frame may be inserted during the charging time slot, or a charging frame may be inserted during the discharging time slot. Also, in FIG. 2, different values ​​are selected as the predicted value of the electricity price (20 yen / kW) for setting the charging time slot and the predicted value of the electricity price (23 yen / kW) for setting the discharging time slot, but this is not limiting. For example, one predicted value of the electricity price that separates the charging time slot and the discharging time slot may be selected, and a time slot where the electricity price is less than this predicted value may be set as the charging time slot, and a time slot where the electricity price is equal to or greater than this predicted value may be set as the discharging time slot.

[0028] When a spot bid is made on an electricity trading day according to the charge / discharge plan created by the charge / discharge plan creation device 110, the charge / discharge time decision device 100 is a device that, when an excess imbalance occurs in each frame of the electricity trading day, in which the actual value of the amount of power of the PV power generation equipment 160 is greater than the planned value of the amount of power, deletes in advance the charging plan of at least one charging frame from among the charging frames C1 to C10 so that the storage battery 180 can charge the surplus amount of power and avoid the excess imbalance, and, when a shortage imbalance occurs, in which the actual value of the amount of power of the PV power generation equipment 160 is less than the planned value of the amount of power, deletes in advance the discharging plan of at least one discharging frame from among the discharging frames D1 to D7 so that the shortage imbalance can be discharged from the storage battery 180 and avoid the shortage imbalance.

[0029] FIG. 3 is a block diagram showing an outline of the functions of the charge / discharge time determination device 100. As shown in FIG.

[0030] The charge / discharge time determination device 100 includes, as means for realizing the above functions, an input unit 210, an SOC prediction unit 220, an SOC comparison unit 230, a charge plan deletion unit 240, a discharge plan deletion unit 250, an upper limit value setting unit 260, a lower limit value setting unit 270, a charge / discharge plan update unit 280, an SOC calculation unit 285, and a memory unit 290.

[0031] The memory unit 290 stores a control program 291, an SOC upper limit value 292 (first value), an SOC lower limit value 293 (second value), an SOC actual value 294, an SOC predicted value 295, charge frame deletion information 296, discharge frame deletion information 297, and a charge / discharge plan update value 298.

[0032] The control program 291 is a program that is executed when the charge / discharge time determination device 100 is operated.

[0033] The SOC predicted value 295 is a value predicted based on the magnitude of the SOC of the state of charge of the storage battery 180 at a first specified time (e.g., 10:00) on the power delivery date and at a second specified time (e.g., 17:00) that is after the first specified time on the power delivery date.

[0034] The SOC upper limit value 292 is a value that is set before the first predetermined time as a value to be compared with the SOC prediction value 295. The SOC upper limit value 292 is set to a predetermined value (e.g., SOC=70%) that indicates that the storage battery 180 is in a charging state close to full charge, taking into consideration the phenomenon in which the chargeable capacity decreases with aging of the storage battery 180, the installation environment of the storage battery 180, self-discharge of the storage battery 180, and the like. Then, if the SOC prediction value 295 is greater than the SOC upper limit value 292 at the first predetermined time, the charging plans of the charging frames C1 to C10 are deleted one by one in descending order of priority until the SOC prediction value 295 becomes smaller than the SOC upper limit value 292.

[0035] The SOC lower limit value 293 is a value that is set before the first predetermined time as a value to be compared with the SOC prediction value 295. The SOC lower limit value 293 is set to a predetermined value (e.g., SOC=30%) that indicates that the storage battery 180 is in a charged state approaching an empty state, taking into consideration the phenomenon in which the chargeable capacity decreases with aging of the storage battery 180, the installation environment of the storage battery 180, self-discharge of the storage battery 180, and the like. Then, if the SOC prediction value 295 is a value smaller than the SOC lower limit value 293 at the first predetermined time, the discharge plans of the discharge frames D1 to D7 are deleted one by one in descending order of priority from among the discharge frames D1 to D7 until the SOC prediction value 295 becomes a value larger than the SOC lower limit value 293.

[0036] The SOC actual value 294 is a value indicating the actual state of charge of the storage battery 180 at the first predetermined time on the power delivery date, expressed as the magnitude of the SOC. The SOC actual value 294 is used when calculating the SOC predicted value 295.

[0037] The charging frame deletion information 296 is information on a charging frame (any of the charging frames C1 to C10) whose charging plan was deleted when the predicted SOC value 295 was greater than the SOC upper limit value 292. For example, when the charging plan for the charging frame C1 is deleted, the charging frame deletion information 296 becomes information indicating the charging frame C1. Furthermore, when the charging plan for the charging frame C1 is deleted and then the charging plan for the charging frame C2 is deleted, the charging frame deletion information 296 is updated to information indicating the charging frames C1 and C2.

[0038] The discharge frame deletion information 297 is information on a discharge frame (any of the discharge frames D1 to D7) whose discharge plan was deleted when the SOC predicted value 295 was smaller than the SOC lower limit value 293. For example, when the discharge plan of the discharge frame D1 is deleted, the discharge frame deletion information 297 becomes information indicating the discharge frame D1. In addition, when the discharge plan of the discharge frame D2 is deleted after the discharge plan of the discharge frame D1 is deleted, the discharge frame deletion information 297 is updated to information indicating the discharge frames D1 and D2.

[0039] The charge / discharge plan update value 298 is a value indicating the charge plan and the discharge plan of the charge / discharge plan before the update created by the charge / discharge plan creation device 110 for spot bidding at a time before the first predetermined time on the power delivery date. Also, the charge / discharge plan update value 298 is a value indicating the charge plan and the discharge plan of the charge / discharge plan after deleting the charge plan of at least one of the charge frames C1 to C10 and the discharge plan of at least one of the discharge frames D1 to D7 from the charge / discharge plan so that the SOC prediction value 295 of the storage battery 180 at the second predetermined time on the power delivery date is calculated to be a value between the SOC upper limit value 292 and the SOC lower limit value 293 at the first predetermined time on the power delivery date. The charge / discharge plan update value 298 is calculated based on the charge / discharge plan before the update, the charge frame deletion information 296, and the discharge frame deletion information 297.

[0040] The input unit 210 receives input of an operation start command that triggers the charge / discharge time determination device 100 to start operation, information indicating the charge / discharge plan created by the charge / discharge plan creation device 110, the predicted value of the electricity price for each frame on the electricity delivery date predicted by the electricity price prediction device 130, the predicted value of the electricity amount for each frame on the electricity delivery date predicted by the electricity amount prediction device 150, etc.

[0041] The SOC calculation unit 285 calculates an SOC actual value 294 indicating the state of charge of the storage battery 180 at a first predetermined time on the power delivery date.

[0042] The SOC prediction unit 220 calculates an SOC prediction value 295 indicating the state of charge of the storage battery 180 at a second predetermined time on the power delivery date based on an actual SOC value 294 of the storage battery 180. Specifically, in each frame from the first predetermined time to the second predetermined time, the SOC prediction unit 220 calculates the difference between the predicted value of the amount of power on the power delivery date acquired from the power amount prediction device 150 and the planned value of the amount of power spot bid on the power trading day before the power delivery date according to the charge and discharge plan, and calculates the SOC prediction value at the second predetermined time by adding this difference as the amount of power of surplus imbalance or shortage imbalance to the actual amount of charge of the storage battery 180 at the first predetermined time.

[0043] The upper limit setting unit 260 sets the SOC upper limit 292 before the first predetermined time on the power delivery date. The upper limit setting unit 260 can set the SOC upper limit 292 to various values ​​depending on the aging of the storage battery 180, the installation environment, etc.

[0044] The lower limit setting unit 270 sets the SOC lower limit 293 before the first predetermined time on the power delivery date. The lower limit setting unit 270 can set the SOC lower limit 293 to various values ​​depending on the aging of the storage battery 180, the installation environment, and the like.

[0045] The SOC comparator 230 compares the SOC predicted value 295 with the SOC upper limit value 292 and also compares the SOC predicted value 295 with the SOC lower limit value 293 during a first predetermined time on the power delivery date.

[0046] When the SOC comparison unit 230 compares the SOC predicted value 295 and the SOC upper limit value 292 and the comparison result shows that the SOC predicted value 295 is greater than the SOC upper limit value 292, the charging plan deletion unit 240 deletes the charging plans of the charging frames C1 to C10 included in the charging and discharging plan obtained from the charging and discharging plan creation device 110 in accordance with the priority order for deletion, until the SOC predicted value 295 recalculated by the SOC prediction unit 220 becomes smaller than the SOC upper limit value 292.

[0047] When the SOC comparison unit 230 compares the SOC predicted value 295 and the SOC lower limit value 293 and the comparison result shows that the SOC predicted value 295 is smaller than the SOC lower limit value 293, the discharge plan deletion unit 250 deletes the discharge plans of the discharge frames D1 to D7 included in the charge and discharge plan obtained from the charge and discharge plan creation device 110 in accordance with the priority order for deletion, until the SOC predicted value 295 recalculated by the SOC prediction unit 220 becomes larger than the SOC lower limit value 293.

[0048] The charge / discharge plan update unit 280 updates the charge / discharge plan based on the charge plans of the charge frames C1-C10 deleted by the charge plan deletion unit 240 and the discharge plans of the discharge frames D1-D7 deleted by the discharge plan deletion unit 250, so that the SOC predicted value 295 of the storage battery 180 at the second predetermined time on the power delivery day becomes a value between the SOC upper limit value 292 and the SOC lower limit value 293. The updated charge / discharge plan update value 298 is stored in the storage unit 290.

[0049] FIG. 4 is a graph showing an example of the relationship between the spot bidding price placed on the electricity trading day according to the charging and discharging plan of the storage battery 180 and the imbalance predicted price on the electricity delivery day obtained from the imbalance price prediction device 140.

[0050] In Fig. 4, the scale on the horizontal axis indicates time in 30-minute units (1 frame unit) in one day, and the scale on the vertical axis on the left side indicates the electricity price in 5 yen / kW units in the market where electricity is bought and sold. Also in Fig. 4, the solid line indicates the spot bid price placed on the electricity trading day in accordance with the charging and discharging plan of the storage battery 180, and the dashed line indicates the imbalance predicted price on the electricity delivery day. Note that, as in Fig. 2, the charging time period is from 9:30 to 14:00, and the discharging time period is from 16:00 to 19:00.

[0051] First, during the charging time slot from 9:30 to 14:00 (19th to 28th frames), the imbalance prediction price is higher than the spot bidding price. When an excess imbalance occurs during the charging time slot, it is desirable to make a profit by selling the excess amount of power, even if it means paying an excess imbalance fee to the general electricity transmission and distribution company, without charging the storage battery 180. On the other hand, when a shortage imbalance occurs during the charging time slot, it is desirable to actively discharge the shortage amount of power from the storage battery 180, without purchasing the shortage amount of power from the general electricity transmission and distribution company.

[0052] Furthermore, during the discharging time period from 16:00 to 19:00 (frames 32 to 38), the imbalance prediction price is lower than the spot bidding price. If a surplus imbalance occurs during the discharging time period, it is desirable to charge the storage battery 180. On the other hand, if a shortage imbalance occurs during the discharging time period, it is desirable to purchase electricity to make up for the shortage in the amount of power from the general electricity transmission and distribution company and refrain from discharging the storage battery 180.

[0053] In this embodiment, in order to charge or discharge the storage battery 180 so as to avoid excess imbalance and shortage imbalance during the charging time period and the discharging time period, when selectively deleting a charging plan of any of the charging frames C1 to C10, the charging plans of the charging frames are deleted in the order of priority from the charging frame with the larger difference between the imbalance prediction price and the spot bid price to the charging frame with the smaller difference, and when selectively deleting a discharging plan of any of the discharging frames D1 to D7, the discharging plans of the discharging frames are deleted in the order of priority from the discharging frame with the smaller difference between the imbalance prediction price and the spot bid price to the discharging frame with the larger difference. Note that the priority of the charging frames C1 to C10 from which the charging plans are deleted may be in the order of the highest imbalance prediction price, and the priority of the discharging frames D1 to D7 from which the discharging plans are deleted may be in the order of the lowest imbalance prediction price.

[0054] The storage battery control device 170 acquires the charge / discharge plan update value 298 stored in the storage unit 290, and controls the charge / discharge operation of the storage battery 180 so that the storage battery 180 performs charging / discharging in accordance with the charge / discharge plan update value 298.

[0055] FIG. 5 is a block diagram showing an example of hardware of the information processing device 10 that realizes the function of the charge / discharge time determination 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 time determination device 100 may be realized using a plurality of information processing devices 10 that are communicably connected.

[0056] 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.

[0057] 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)).

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The input device 14 and the output device 15 constitute a user interface for receiving information from the user and presenting information.

[0062] 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.

[0063] 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.

[0064] The functions of the charge / discharge time determination 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 time determination device 100. For example, the functions of the SOC prediction unit 220, the SOC comparison unit 230, the charging plan deletion unit 240, the discharging plan deletion unit 250, the upper limit value setting unit 260, the lower limit value setting unit 270, and the charge / discharge plan update unit 280 are realized by the processor 11, and the storage unit 290 is realized by the main storage device 12 and the auxiliary storage device 13.

[0065] Fig. 6 is a flowchart showing an example of a process when the charge / discharge time determination device 100 deletes the charging plans of the charging frames and the discharging plans of the discharging frames included in the charge / discharge plan according to the priority order. The charging frames to be deleted are the charging frames C1 to C10 included in the charging time slot in Fig. 2, and the discharging frames to be deleted are the discharging frames D1 to D7 included in the discharging time slot in Fig. 2. The priority order of the charging frames C1 to C10 for which the charging plans are deleted is in descending order of the difference between the imbalance prediction price on the power delivery date and the spot bid price on the power trading date, which is the day before the power delivery date, as shown in Fig. 4, and the priority order of the discharging frames D1 to D7 for which the discharge plans are deleted is in descending order of the difference between the imbalance prediction price on the power delivery date and the spot bid price on the power trading date, as shown in Fig. 4. In addition, in the memory unit 290, in addition to the control program 291, an SOC upper limit value 292 and an SOC lower limit value 293 that are appropriately set are stored at a time before the first specified time on the power delivery date, and the charge / discharge plan before the update is stored as a charge / discharge plan update value 298.

[0066] First, on the power delivery date, when an operation start command for starting the operation of the charge / discharge time determination device 100 is input to the input unit 210 (S1010: YES), the input of the operation start command triggers the execution of the processing from step S1020 onwards. The time when the operation start command is input is the first predetermined time.

[0067] The SOC calculation unit 285 calculates an SOC actual value 294 indicating the actual state of charge of the storage battery 180 at the first specified time. The storage unit 290 stores the calculated SOC actual value 294. Then, the SOC prediction unit 220 calculates an SOC predicted value 295 indicating the state of charge of the storage battery 180 at the second specified time on the power delivery date based on the SOC actual value 294 of the storage battery 180 (S1020).

[0068] Next, the SOC comparing section 230 reads and acquires the SOC upper limit value 292 from the storage section 290, and compares the SOC predicted value 295 with the SOC upper limit value 292 (S1030).

[0069] When the SOC comparison unit 230 compares the SOC predicted value 295 and the SOC upper limit value 292 and finds that the SOC predicted value 295 is greater than the SOC upper limit value 292 (S1030: YES), since the remaining chargeable capacity of the storage battery 180 will be small at the second specified time, the charging plan deletion unit 240 deletes the charging plan of the charging frame C1 to C10 that has the largest difference between the imbalance predicted price on the power delivery date and the spot bid price on the power trading date (S1040).

[0070] Next, the SOC prediction unit 220 recalculates the SOC predicted value 295 based on the charging plan of the charging frame deleted in the above step S1040 (S1050), and executes the above step S1030 again.

[0071] When the SOC comparison unit 230 compares the recalculated SOC predicted value 295 and the SOC upper limit value 292 again and the SOC predicted value 295 is greater than the SOC upper limit value 292 (S1030: YES), the state in which the remaining chargeable capacity of the storage battery 180 is low continues in the second predetermined time, and the above-mentioned processing of steps S1040 and S1050 is executed again. Specifically, in step S1040, the charging plan of the charging frame with the next largest difference between the imbalance predicted price on the power delivery date and the spot bid price on the power trading date is deleted from among the charging frames C1 to C10, and the SOC predicted value 295 is recalculated in step S1050. In this way, the loop processing of steps S1030, S1040, and S1050 is repeatedly executed until the calculated SOC predicted value 295 becomes smaller than the SOC upper limit value 292.

[0072] Then, when the SOC comparison unit 230 compares the recalculated SOC predicted value 295 and the SOC upper limit value 292 and finds that the SOC predicted value 295 is smaller than the SOC upper limit value 292 (S1030: NO), the SOC comparison unit 230 reads and obtains the SOC lower limit value 293 from the memory unit 290, and compares the SOC predicted value 295 and the SOC lower limit value 293 (S1060).

[0073] If the SOC comparison unit 230 compares the SOC predicted value 295 and the SOC lower limit value 293 and finds that the SOC predicted value 295 is smaller than the SOC lower limit value 293 (S1060: YES), the amount of dischargeable power from the storage battery 180 in the second specified time is reduced, so the discharge plan deletion unit 250 deletes the discharge plan of the discharge frame from among the discharge frames D1 to D7 that has the smallest difference between the imbalance predicted price on the power delivery date and the spot bid price on the power trading date (S1070).

[0074] Next, the SOC prediction unit 220 recalculates the SOC prediction value 295 based on the discharge plan of the discharge frame deleted in the above step S1070 (S1080), and executes the above step S1060 again.

[0075] When the SOC comparison unit 230 compares the recalculated SOC prediction value 295 and the SOC lower limit value 293 again and the SOC prediction value 295 is smaller than the SOC lower limit value 293 (S1060: YES), the state in which the amount of dischargeable power of the storage battery 180 is small continues in the second predetermined time, and the above-mentioned processing of steps S1070 and S1080 is executed again. Specifically, in step S1070, the discharge plan of the discharge frame with the next smallest difference between the imbalance prediction price on the power delivery day and the spot bid price on the power trading day is deleted from among the charge frames D1 to D7, and the SOC prediction value 295 is recalculated in step S1080. In this way, the loop processing of steps S1060, S1070, and S1080 is repeatedly executed until the calculated SOC prediction value 295 becomes larger than the SOC lower limit value 293.

[0076] Then, when the SOC comparison unit 230 compares the recalculated SOC predicted value 295 with the SOC lower limit value 293 and finds that the SOC predicted value 295 is greater than the SOC lower limit value 293 (S1060: NO), the SOC comparison unit 230 determines that the SOC predicted value 295 is a value between the SOC upper limit value 292 and the SOC lower limit value 293 (S1090).

[0077] In the above step S1090, when the SOC predicted value 295 is determined, the charge / discharge plan update unit 280 creates a charge / discharge plan update value by deleting the charging plan of any of the charging frames C1 to C10 and the discharging plan of any of the discharging frames D1 to D7 from the original charge / discharge plan created by the charge / discharge plan creation device 110 so that the SOC predicted value 295 is a value between the SOC upper limit value 292 and the SOC lower limit value 293, and stores this charge / discharge plan update value in the memory unit 290 (S1100).

[0078] In addition, if the initial SOC predicted value 295 is smaller than the SOC upper limit value 292 (S1030: NO) and the initial SOC predicted value 295 is larger than the SOC lower limit value 293 (S1060: NO), the charge / discharge plan update value 298 remains the content of the initial charge / discharge plan created by the charge / discharge plan creation device 110.

[0079] The battery control device 170 reads and acquires the charge / discharge plan update value 298 from the storage unit 290, and controls the charge / discharge operation of the battery 180 according to the charge / discharge plan update value 298. Specifically, the battery control device 170 controls the charge / discharge operation of the battery 180 based on the amount of surplus or shortage imbalance for each frame except for the charge frame for which the charge plan has been deleted and the discharge frame for which the discharge plan has been deleted. Specifically, for each frame except for the charge frame for which the charge plan has been deleted and the discharge frame for which the discharge plan has been deleted, if an excess imbalance occurs, the battery control device 170 controls the charging operation of the battery 180 so as to charge the surplus amount of power, which is the difference between the actual value of the amount of power generated by the PV power generation facility 160 and the planned value of the amount of power spot bid, and on the other hand, if a shortage imbalance occurs, the battery control device 170 controls the discharging operation of the battery 180 so as to discharge the shortage amount of power, which is the difference between the actual value of the amount of power generated by the PV power generation facility 160 and the planned value of the amount of power spot bid.

[0080] In addition, in step S1040, the charging plan deletion unit 240 may delete charging plans of charging frames from among the charging frames C1 to C10 in order of the frames with the highest imbalance predicted price on the power delivery date, and in step S1070, the discharging plan deletion unit 250 may delete discharging plans of discharging frames from among the discharging frames D1 to D7 in order of the frames with the lowest imbalance predicted price on the power delivery date.

[0081] As described above, the charge / discharge time determination device 100 acquires a charge / discharge plan for a power trading day for a storage battery 180 that charges with power generated by a PV power generation facility 160 that uses renewable energy and discharges the charged power, the charge / discharge plan including a plurality of charging frames C1 to C10 including a charging plan for the storage battery 180 and a plurality of discharging frames D1 to D7 including a discharging plan for the storage battery 180, among a plurality of frames obtained by dividing a day into fixed time units, and acquires a charge / discharge plan for a power trading day for the storage battery 180 that charges with power generated by a PV power generation facility 160 that uses renewable energy and discharges the charged power, the charge / discharge plan including a plurality of charging frames C1 to C10 including a charging plan for the storage battery 180 and a plurality of discharging frames D1 to D7 including a discharging plan for the storage battery 180, and acquires a charge / discharge plan for the storage battery 180 at a first predetermined time (e.g., 10:00) on a power selling day, which is the day after the power trading day, and acquires a charge / discharge plan for the storage battery 180 at a second predetermined time (e.g., 17:00) that is later than the first predetermined time. and deleting charging plans of charging frames from among charging frames C1 to C10 in descending order of the difference between the imbalance predicted price on the power selling date and the spot bid price based on the charging and discharging plan so that, when the SOC predicted value 295 of the storage battery 180 is calculated as a value greater than the SOC upper limit value 292 at a first predetermined time on the power selling date, the SOC predicted value 295 of the storage battery 180 at a second predetermined time is recalculated as a value smaller than the SOC upper limit value 292. and a discharge plan deletion unit 250 that deletes discharge plans of discharge frames from among the discharge frames D1 to D7 in order of the smallest difference between the imbalance predicted price and the spot bid price on the power delivery date so that, when the SOC predicted value 295 of the storage battery 180 at the second specified time is calculated to be a value smaller than the SOC lower limit value 293 which is smaller than the SOC upper limit value 292, the SOC predicted value 295 of the storage battery 180 at the second specified time is recalculated to be a value larger than the SOC lower limit value 293.

[0082] Also, the charge / discharge time determination device 100 acquires a charge / discharge plan for a storage battery 180 on an electricity trading day, the storage battery 180 charging with electricity generated by a PV power generation facility 160 that uses renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charging frames C1 to C10 including a charging plan for the storage battery 180 and a plurality of discharging frames D1 to D7 including a discharging plan for the storage battery 180, among a plurality of frames obtained by dividing a day into fixed time units, and the charge / discharge time determination device 100 acquires a charge / discharge plan for a storage battery 180 on an electricity trading day, the charge / discharge plan including a plurality of charging frames C1 to C10 including a charging plan for the storage battery 180 and a plurality of discharging frames D1 to D7 including a discharging plan for the storage battery 180, ... a power selling day, the power trading day, the next day, the charge / discharge time determination device 100 acquires a charge / discharge plan for a storage battery 180 on a power selling day, the charge / discharge time determination device 100 acquires a charge / discharge plan for a storage battery 180 on a power trading day, the charge / discharge time determination device 100 acquires a charge / discharge plan for a storage battery 180 on a power trading day, the charge / discharge time determination device 100 acquires a charge / discharge plan for a storage battery 180 on a power trading day, the charge / dis the charging plan deletion unit 240 deleting charging plans of the charging frames C1 to C10 in descending order of the imbalance predicted price on the power selling date, from among the charging frames C1 to C10, in descending order of the imbalance predicted price on the power selling date, so that when the SOC predicted value 295 of the storage battery 180 at the first predetermined time on the power selling date is calculated as a value greater than the SOC upper limit value 292, the SOC predicted value 295 of the storage battery 180 at the second predetermined time is recalculated as a value smaller than the SOC upper limit value 292; and the discharging plan deletion unit 250 deleting discharging plans of the discharging frames D1 to D7 in descending order of the imbalance predicted price on the power selling date, from among the discharging frames D1 to D7, in descending order of the imbalance predicted price on the power selling date, so that when the SOC predicted value 295 of the storage battery 180 at the second predetermined time is calculated as a value smaller than the SOC lower limit value 293 which is smaller than the SOC upper limit value 292, the SOC predicted value 295 of the storage battery 180 at the second predetermined time is recalculated as a value greater than the SOC lower limit value 293.

[0083] According to the charge / discharge time determination device 100 of the present invention, at least a part of the charging plan and discharging plan of the storage battery 180 is deleted so that the SOC predicted value 295 at the second specified time of the storage battery 180 becomes a value between the SOC upper limit value 292 and the SOC lower limit value 293. Therefore, even if surplus imbalance or shortage imbalance occurs, for example, continuously, the storage battery 180 can be charged and discharged so as to avoid surplus imbalance or shortage imbalance.

[0084] In addition, in the charge / discharge time determination device 100, the SOC prediction unit 220 calculates a SOC prediction value 295 of the storage battery 180 at a second specified time based on the predicted value of the power amount of the PV power generation equipment 160 on the power sale date and the planned value of the power amount of the spot bid based on the charge / discharge plan.

[0085] According to the charge / discharge time decision device 100 of the present invention, it is possible to accurately calculate the SOC predicted value 295 of the storage battery 180 at the second predetermined time.

[0086] It should be noted that the present embodiment is provided for the purpose of facilitating 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]

[0087] 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 Charge / discharge time determination device 110 Charging and discharging plan creation device 120 Weather information providing device 130 Electricity price forecasting device 140 Imbalance Price Prediction Device 150 Electricity forecasting device 160 PV power generation facilities 170 Battery control device 180 Battery 190 Communication Network 195 Power system 210 Input section 220 SOC Prediction Section 230 SOC comparison section 240 Charging plan deletion unit 250 Discharge Plan Deletion Section 260 Upper limit setting section 270 Lower limit setting section 280 Charging and discharging plan update section 285 SOC calculation section 290 Storage section 291 Control Program 292 SOC upper limit 293 SOC lower limit 294 SOC actual value 295 SOC predicted value 296 Charging frame deletion information 297 Discharge frame deletion information 298 Charge / discharge plan update value

Claims

1. A charge / discharge time determination device that acquires a charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, A prediction unit that predicts a state of charge (SOC) of the storage battery at a predetermined time on an electricity delivery date after the electricity trading date; a deletion unit that deletes the charging plans of the charging frames in descending order of a difference between an imbalance prediction price and a spot bid price based on the charge and discharge plan, when it is predicted that the SOC of the storage battery at the predetermined time on the power delivery date will be greater than a first value, so that the SOC of the storage battery at the predetermined time will be smaller than the first value, and deletes the discharging plans of the discharging frames in ascending order of a difference between the imbalance prediction price and the spot bid price, when it is predicted that the SOC of the storage battery at the predetermined time will be smaller than a second value that is smaller than the first value, so that the SOC of the storage battery at the predetermined time will be greater than the second value; A charge / discharge time determination device comprising:

2. A charge / discharge time determination device that acquires a charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, A prediction unit that predicts a state of charge (SOC) of the storage battery at a predetermined time on an electricity delivery date after the electricity trading date; a deletion unit that deletes charging plans in the charging frames in descending order of imbalance prediction prices on the power delivery date, when it is predicted that the SOC of the storage battery at the predetermined time will be greater than a first value, so that the SOC of the storage battery at the predetermined time will be smaller than the first value, and deletes discharging plans in the discharging frames in ascending order of imbalance prediction prices, when it is predicted that the SOC of the storage battery at the predetermined time will be smaller than a second value that is smaller than the first value, so that the SOC of the storage battery at the predetermined time will be greater than the second value; A charge / discharge time determination device comprising:

3. 3. The charge / discharge time determination device according to claim 1, The prediction unit predicts an SOC of the storage battery at a predetermined time based on a predicted value of the amount of power of the power generation facility on the power trading day and a planned value of the amount of power for spot bidding based on the charge and discharge plan. Charge / discharge time determination device.

4. A charge / discharge time determination method for a charge / discharge time determination device that acquires a charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, the charge / discharge time determination method comprising: A first step of predicting a state of charge (SOC) of the storage battery at a predetermined time on a power delivery date after the power trading date; a second step of deleting the charging plans of the charging frames in descending order of a difference between the imbalance prediction price on the power delivery date and the spot bid price based on the charge / discharge plan, so that the SOC of the storage battery at the predetermined time is smaller than the first value, when the SOC of the storage battery at the predetermined time is predicted to be greater than a first value on the power delivery date, and deleting the discharging plans of the discharging frames in ascending order of a difference between the imbalance prediction price and the spot bid price, when the SOC of the storage battery at the predetermined time is predicted to be smaller than a second value that is smaller than the first value, so that the SOC of the storage battery at the predetermined time is larger than the second value; A method for determining charge and discharge time.

5. A charge / discharge time determination method for a charge / discharge time determination device that acquires a charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, the charge / discharge time determination method comprising: A first step of predicting a state of charge (SOC) of the storage battery at a predetermined time on a power delivery date after the power trading date; a second step of deleting charging plans in the charging frames in descending order of imbalance prediction prices on the power delivery date so that the SOC of the storage battery at the predetermined time will be smaller than the first value when the SOC of the storage battery at the predetermined time is predicted to be larger than a first value on the power delivery date, and deleting discharging plans in the discharging frames in descending order of imbalance prediction prices so that the SOC of the storage battery at the predetermined time will be larger than the second value when the SOC of the storage battery at the predetermined time is predicted to be smaller than a second value that is smaller than the first value; A method for determining charge and discharge time.

6. The charge / discharge time determination method according to claim 4 or 5, In the first step, an SOC of the storage battery at a predetermined time is predicted based on a predicted value of the amount of power of the power generation facility on the power delivery date and a planned value of the amount of power of a spot bid based on the charge / discharge plan. How to determine charge / discharge time.

7. A charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, A first process of predicting a state of charge (SOC) of the storage battery at a predetermined time on an electricity delivery date after the electricity trading date; a second process for deleting the charging plans of the charging frames in descending order of a difference between the imbalance prediction price on the power delivery date and the spot bid price based on the charge / discharge plan, so that the SOC of the storage battery at the predetermined time is smaller than the first value, when the SOC of the storage battery at the predetermined time is predicted to be greater than a first value on the power delivery date, and deleting the discharging plans of the discharging frames in ascending order of a difference between the imbalance prediction price and the spot bid price, when the SOC of the storage battery at the predetermined time is predicted to be smaller than a second value that is smaller than the first value, so that the SOC of the storage battery at the predetermined time is larger than the second value; A program that executes the following.

8. A charge / discharge plan for a storage battery on an electricity trading day, the storage battery being charged with electricity generated by a power generation facility that utilizes renewable energy and discharging the charged electricity, the charge / discharge plan including a plurality of charge frames including a charge plan for the storage battery and a plurality of discharge frames including a discharge plan for the storage battery among a plurality of frames obtained by dividing a day into fixed time units, A first process of predicting a state of charge (SOC) of the storage battery at a predetermined time on an electricity delivery date after the electricity trading date; a second process for deleting charging plans in the charging frames in descending order of imbalance prediction prices on the power delivery date so that the SOC of the storage battery at the predetermined time becomes smaller than the first value when the SOC of the storage battery at the predetermined time is predicted to be larger than a first value on the power delivery date, and deleting discharging plans in the discharging frames in descending order of imbalance prediction prices so that the SOC of the storage battery at the predetermined time becomes larger than the second value when the SOC of the storage battery at the predetermined time is predicted to be smaller than a second value that is smaller than the first value; A program that executes the following.

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