JP2017011950A - Power system, controller and control method of power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power system capable of reducing the used electricity charge, and to provide a controller and a control method of the power system.SOLUTION: In a power system including a solar cell capable of supplying generated power to a load and flowing power reversely to a power system, an accumulator battery capable of charging with power supplied from the power system and discharging the charged power to the load, and a controller for controlling charge and discharge of the accumulator battery, the accumulator battery is charged in a first time zone, and starts discharge at a predetermined discharge start time in a second time zone following to the first time zone in a rain forecast day, and the controller adjusts the discharge start time of the accumulator battery in the next time rain forecast day, with reference to the residual quantity of the accumulator battery in the rain forecast day after discharge. The used electricity charge can be reduced by such a power system.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power system, a controller, and a power system control method for controlling a storage battery so as to be discharged in a time zone different from a time zone in which power supplied from an electric power system is charged.

  For example, Patent Document 1 is known as a technique for charging a storage battery with power supplied from an electric power system in a certain time zone and discharging the power charged in the storage battery in another time zone.

  Patent Document 1 discloses that during solar power generation, power consumption from a commercial AC power source is limited to ensure power sales, and power is purchased from the commercial AC power source at midnight power charges and charged to a storage battery. Consumes the power of the storage battery and consumes it directly at the late-night electricity rate. When the power until the next late-night charge period is insufficient, the storage battery is supplementarily charged from solar power generation or commercial AC power, and the storage battery is being charged. , Charge the charge at midnight power charge with an external storage battery, and monitor the battery charge from solar power generation or commercial AC power supply and discharge due to private consumption. It is described that the AC power distribution board is supplied with direct power from a commercial power source and DC / AC converted power from a storage battery.

JP 2011-97795 A

By the way, as described in Patent Document 1, a fee system such as changing the charge between daytime and midnight has been introduced, but recently, the power charge system is further diversified. For such diversified power charge systems, there is currently no proposal for a technology for controlling power so that the power charge can be sufficiently reduced.
The present invention has been made in view of the above-mentioned problems, and it is possible to control the storage battery so that it is discharged in a time zone different from the time zone in which the power supplied from the power system is charged. An object of the present invention is to provide a power system, a controller, and a control method for the power system that can be reduced.

  The power system of the present invention is capable of supplying generated power to a load and capable of reverse power flow to the power system, and charging the power supplied from the power system and discharging the charged power. An electric power system including a storage battery that can be supplied to a load and a controller that controls charging / discharging of the storage battery. The electric power charge of the electric power system varies depending on the time zone, and at least a predetermined charge is determined in the time zone. A first time zone, a second time zone in which a higher fee is set than the first time zone, and a third time zone in which a higher fee is set than the second time zone, and the second time zone is It is a time zone sandwiched between the first time zone and the third time zone, and the storage battery is charged in the first time zone. In the case of a rainy weather forecast day, it is determined in advance in the second time zone following the first time zone. When the discharge starts at the specified discharge start time , The controller refers to the amount of remaining after the discharge of the battery of the rainy weather forecast date, is intended to adjust the discharge start time of the battery of the next rainy weather forecast date.

  In the power system of the present invention, the controller includes a controller that adjusts the discharge start time of the storage battery on the next rainy forecast day with reference to the weather result on the rainy forecast day.

  In the power system of the present invention, the controller includes a controller that adjusts the discharge start time of the storage battery on the next rainy forecast day with reference to the power generation amount of the solar battery on the rainy forecast day.

  The controller of the present invention is capable of supplying generated power to a load and capable of reverse power flow to the power system, and charging the power supplied from the power system and discharging the charged power to load. A controller for controlling charging and discharging of the storage battery of the power system having a storage battery that can be supplied to the power system, wherein the power charge of the power system varies depending on the time zone, and the time zone is a first time zone in which at least a predetermined charge is determined And a second time zone in which a charge higher than the first time zone is set and a third time zone in which a charge higher than the second time zone is set, and the second time zone is the first time zone and the second time zone. In the case of a rainy weather forecast day, the storage battery charged in the first time zone is a time zone between the three time zones, and in the second time zone following the first time zone, the discharge start time determined in advance And start discharging With reference to the remaining amount of post-discharge of the battery of the rainy weather forecast date, and performs the control to adjust the discharge start time of the battery of the next rainy weather forecast date.

  The power system control method of the present invention includes a solar cell that can supply generated power to a load and can reversely flow to the power system, and can recharge the power supplied from the power system. A power system control method comprising a storage battery that can be discharged and supplied to a load, and a controller that controls charging and discharging of the storage battery, wherein the power charge of the power system varies depending on the time zone, and the time zone is at least predetermined A first time zone in which a charge for the first time is set, a second time zone in which a higher charge is set than the first time period, and a third time period in which a higher charge is set than the second time period, The second time zone is a time zone sandwiched between the first time zone and the third time zone, and the storage battery is charged in the first time zone. In the case of a rainy weather forecast day, the second time zone follows the first time zone. Discharge opening predetermined in the time zone With starting the discharge at the time, the controller refers to the amount of remaining after the discharge of the battery of the rainy weather forecast date, is intended to adjust the discharge start time of the battery of the next rainy weather forecast date.

  According to the present invention, the electricity charge can be reduced by effectively using the power charged in the time zone where the electricity charge is cheap.

It is a functional block diagram which shows schematic structure of the electric power system of this invention. It is a graph which shows the condition of the power consumption at the time of fine weather, an electric power generation, and a storage battery. It is a graph which shows the case where the same control as a sunny day is performed on a rainy day. It is a graph which shows the condition of the power consumption of rainy weather, electric power generation, and a storage battery. It is a graph which shows the condition of the power consumption of rainy weather, electric power generation, and a storage battery. It is a flowchart which shows operation | movement of the electric power system of this invention. It is a flowchart which shows operation | movement of the electric power system of this invention. It is a graph which shows the condition of the power consumption at the time of rainy weather, electric power generation, and a storage battery. It is a graph which shows an example of control of the electric power system of rainy weather forecast day.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a functional block diagram showing a schematic configuration of a power system according to the present invention. The power system 13 includes a solar cell 1, a generated power measuring unit 2 that measures the power generated by the solar cell 1, a DC / DC converter 3 that converts a DC voltage from the solar cell 1, a storage battery 4, a direct current A DC / DC converter 5 that converts the voltage and supplies it to the storage battery 4 and converts the direct current voltage from the storage battery 4 is provided.

  The power system 13 converts both DC power from the DC / DC converter 3 and / or the DC / DC converter 5 into AC power, and converts AC power from the power system 6 into DC power. Supplied from the power system 6, a DC / AC inverter 7 directed to the power supply, a power sales measuring unit 8 that measures the power to be sold by reversely flowing the AC power converted by the DC / AC inverter 7 to the power system 6, and the power system 6 A power purchase measuring unit 9 that measures power, a charge / discharge control device 10 that is a charge / discharge control unit that controls charge / discharge of the storage battery 4, and a controller 11 are provided.

  Further, in the configuration shown in FIG. 1, a load 12 is connected between the DC / AC inverter 7 and the power sale measuring unit 8, and the load 12 includes power from the power system 6 and solar cell 1. Both electric power and electric power from the storage battery 4 can be supplied.

  The controller 11 includes a communication interface. With this communication interface, information related to the generated power from the generated power measuring unit 2, information related to the sold power from the power selling measuring unit 8, and power purchased from the purchased power measuring unit 9. Information can be received by wire or wirelessly, and weather information can be received from the outside via an Internet line or the like. The weather information includes, but is not limited to, for example, weather forecast, precipitation, temperature, humidity, wind direction, wind speed, solar radiation, sunshine duration, sunrise sunset time, weather warning, weather warning, etc. . Further, the controller 11 can communicate with the charge / discharge control device 10 by wire or wirelessly through the communication interface, and also controls the charge / discharge control device 10 to include the storage battery 4 including control of the discharge start time of the storage battery 4. It is possible to control charging and discharging.

  In FIG. 1, the controller 11 is separate from the charge / discharge control device 10, but the controller 11 and the charge / discharge control device 10 may be integrated.

  In FIG. 1, the controller 11 can use a mobile terminal device such as a tablet terminal device or a smartphone as a display device, and each of the generated power measuring unit 2, the power selling measuring unit 8, and the purchased power measuring unit 9. Based on this information, it is possible to monitor each of the information related to the power generated by the solar cell 1, the information related to the reversely flowed power, and the information related to the power supplied from the power system 6.

  A charge plan for the amount of power used in the present embodiment will be described. In this embodiment, on weekdays, from 13:00 to 7:00 the next morning, the first time zone, from 7:00 to 10:00, and from 17:00 to 23:00 are the second time zone, and from 10:00 to 17:00 is the third time zone. It is set in a three-stage price plan for the time zone. For example, the charge for the power consumption of 1 kWh is 10.76 yen for the first time zone, 24.59 yen for the second time zone, and 24.59 yen for the second time zone. It is assumed that the first time zone is the cheapest and the third time zone is the highest at 32.58 yen. In other words, there is a second time zone with an intermediate fee sandwiched between a first time zone with the lowest charge and a third time zone with the highest charge.

(Explanation of clear weather forecast day)
FIG. 2 is a graph showing the power consumption, power generation, and storage battery status in fine weather. First, the operation of this embodiment on a day when the weather forecast is sunny (sunny weather forecast day) will be described with reference to FIG. In FIG. 2A, the horizontal axis indicates time, and the vertical axis indicates arbitrary power consumption or generated power of the solar cell. The solid line indicates the generated power of the solar cell, and the boundary of the gray area indicates the power consumption. Moreover, in FIG.2 (b), a horizontal axis shows time and a vertical axis | shaft shows an electricity bill. Moreover, in FIG.2 (c), a horizontal axis shows time and a vertical axis | shaft shows a storage battery residual amount.

  The storage battery 4 is charged from the electric power system 6 in the first time zone (up to 7:00) where the electricity bill is cheap and reaches the upper limit charge amount. Usually, charging is completed before sunrise. In the first time zone, the storage battery 4 does not discharge. The power consumption is basically provided by the power from the power system 6, but when the solar cell 1 starts generating power at an early sunrise or the like, the power generation of the solar cell 1 and the power of the power system 6 are used. Furthermore, when the power generation amount of the solar cell 1 exceeds the power consumption, the surplus of power is sold.

  The controller 11 receives weather information from the Internet or the like. When the weather forecast obtained before 7 o'clock is “sunny” in the daytime weather, the controller 11 controls the sunny weather forecast day.

  First, the controller 11 instructs the charge / discharge control device 10 to start discharging the storage battery 4 from 7 o'clock in the second time zone.

  Next, at 7 o'clock, the charge / discharge control device 10 controls the DC / DC converter 5 to discharge from the storage battery 4. Until the power generation of the solar cell 1 starts, the amount of power purchased is reduced by discharging from the storage battery 4.

  Next, when the power generation of the solar cell 1 is started, the power consumption is basically provided by the power generation of the solar cell 1 and the discharge of the storage battery 4. When the power consumption cannot be covered by the power generation of the solar cell 1 and the discharge of the storage battery 4, power may be temporarily purchased from the power system 6. As the power generation of the solar cell 1 increases, the discharge amount of the storage battery 4 decreases. Further, when the power consumption of the solar battery exceeds the power consumption, the discharge of the storage battery stops, and surplus power obtained by subtracting the power consumption from the power generation of the solar battery 1 is sold.

  In the third time zone on a clear day (10:00 to 17:00), surplus power obtained by subtracting the power consumption from the power generation of the solar cell 1 is sold. When the power generation of the solar cell 1 is less than the power consumption due to a decrease in the amount of solar radiation, it is compensated by the discharge of the storage battery.

  Next, in the second time zone (17:00 to 21:00), when the power generation of the solar cell 1 is less than the power consumption, it is compensated by the discharge from the storage battery 4. When the time advances and the amount of power generated by the solar cell becomes zero, the power demand is covered only by the discharge of the storage battery 4. In FIG. 2 (c), there is a dischargeable amount of the storage battery until the end of the second time zone. Power consumption is provided by the system 6. At this time, the storage battery 4 is not charged.

  Next, in the 3rd time slot | zone (from 21:00), the storage battery 4 starts charge and charges to the upper limit of charge amount. All the power consumption in the third time zone is provided by the power from the power system 6.

(Explanation of rainy day forecast)
FIG. 3 is a graph showing a case where the same control is performed on a rainy day as on a sunny day. The configuration of the graph in FIG. 3 is the same as that in FIG. When power control similar to that on a sunny day is performed on a rainy day, the amount of power generated by the solar cell 1 during the day is small, so the amount of discharge of the storage battery 4 increases. Therefore, the storage amount of the storage battery 4 reaches the minimum remaining amount in the middle of the third time period, and power is supplied from the power system 6. In this case, power is purchased from the power system 6 at a high power charge in the third time zone, which is uneconomical.

  FIG. 4 is a graph showing the power consumption, power generation, and storage battery status in rainy weather. A case where the weather forecast is “rainy” (rainy weather forecast day) and the actual weather is raining is illustrated. The configuration of the graph in FIG. 4 is the same as that in FIG. On the rainy forecast day, the discharge start time in the second time zone (7 to 10 o'clock) is shifted backward, and control is performed so that power is not purchased in the third time zone. Specifically, when the weather forecast before 7 o'clock is “rain”, the controller 11 performs control on the rainy day forecast day.

  The rainy weather forecast day is a day when the daytime weather according to the weather forecast is a rainy day. Regardless of this, the day when the sunshine time or the amount of sunshine is expected to be less than a predetermined threshold may be used as the rainy weather forecast day.

  First, the controller 11 instructs the charging control device 10 to start discharging from 10:00, which is the beginning of the third time zone. The electric power system purchases electric power from the electric power system 6 from 7 o'clock beginning in the second time zone. The power consumption is covered by the power generation of the solar cell 1 and the purchase of power.

  Next, at 10 o'clock in the third time zone, the charge / discharge control device 10 controls the DC / DC converter 5 to start discharging the storage battery 4. The power consumption in the third time zone is provided by the power of the storage battery 4 and the solar battery 1. The storage battery 4 continues to be discharged, and receives power from the power system 6 after the power stored in the storage battery 4 has been used up during the second time period.

  FIG. 5 is a graph showing the power consumption, power generation, and storage battery status in rainy weather. This is an example in the case where the power consumption is lower than that in FIG. In Fig.5 (a), a horizontal axis shows time and a vertical axis | shaft shows arbitrary power consumption or the generated electric power of a solar cell. The solid line indicates the generated power of the solar cell, and the boundary of the gray area indicates the power consumption. In FIG. 5B, the horizontal axis indicates time, and the vertical axis indicates electricity charges. Moreover, in FIG.5 (c) and FIG.5 (d), a horizontal axis shows time and a vertical axis | shaft shows a storage battery residual amount.

  In FIG. 5C, the rainy weather forecast date is controlled as in the example shown in FIG. The discharge of the storage battery 4 starts from 10:00, but since the power consumption is low, the electricity charged in the storage battery 4 cannot be used up and can be used for the storage battery 4 even at 23:00, which is the start time of the first time zone. Electricity remains. In such a case, the electricity remaining in the storage battery 4 is carried over to the next day. However, if the power charged in the first time zone where the power rate is low is used up in the third time zone and the second time zone where the power rate is high, the total power rate becomes lower. Therefore, as shown in FIG. 5 (d), a system is shown in which the discharge start time of the storage battery 4 is advanced and the normally usable electricity is used up by the start time of the first time zone as much as possible.

  6 and 7 are flowcharts showing the operation of the power system of the present invention. First, the controller 11 acquires a weather forecast immediately before the first time zone (S101), and determines today's weather based on the obtained weather forecast (S102). When it is determined that the weather is “clear”, as described above, the control is performed on the clear weather forecast day when the discharge from the storage battery 4 is started from the start time of the first time zone (S105). When the controller 11 determines “rainy”, the rainy weather forecast day described below is controlled.

  First, it waits until the discharge start time on a rainy weather forecast day (S103). The power consumption is provided from the power system 6 until the discharge start time. When the discharge start time comes, discharging of the storage battery 4 is started (S104). The initial value of the discharge start time is 10:00, which is the start time of the third time zone.

  When the discharge is started, the battery 4 is discharged to cover the power consumption until the battery 4 reaches the minimum remaining amount. When the solar cell 1 is generating power, the solar cell 1 and the storage battery 4 provide power consumption. However, when the solar cell 1 generates power, the discharge of the storage battery 4 is temporarily stopped. The surplus power generated in is sold. These controls are performed in cooperation with the DC / DC converter 3, the DC / DC converter 5, and the DC / AC inverter 7.

  After the start of discharge, the controller 11 monitors the remaining amount of the storage battery 4 via the charge / discharge control device 10 (S201). When the capacity of the storage battery reaches the minimum remaining capacity, the discharge is terminated (S202), the discharge end time is recorded (S203), and the process waits until the first time period starts (S204).

  When the storage battery 4 does not reach the minimum remaining amount by the start time of the first time zone, the controller 11 ends the discharge of the storage battery 4 at the start time (23:00) of the first time zone (S205) (S206). .

  Next, at 23:00 in the first time zone, the controller 11 determines whether or not more electricity than the minimum remaining amount remains in the storage battery 4 (S301). When electricity remains in the storage battery 4, the controller 11 refers to the daytime weather information and confirms the weather on the rainy day. That is, the weather result is confirmed. When the weather result is rain, the charging / discharging control device 10 determines that the discharge start time of the storage battery 4 during rainy weather is too late, and sets the discharge start time so that the discharge start time during rainy weather is shifted forward. Change (S303). For example, if the discharge start time is 10 o'clock, the discharge start time is changed so that it is advanced by 1 hour at 9 o'clock. After changing the discharge start time, the controller 11 starts charging the storage battery 4 (S306). After charging starts, the controller 11 waits until the next morning while monitoring the charging status. Needless to say, the weather result may be confirmed after sunset without waiting for 23:00.

  Then, when the controller 11 obtains a weather forecast the next day and determines that it is raining and controls the rainy weather forecast day, it starts discharging from the changed discharge start time. And the controller 11 confirms the residual amount of the storage battery 4 at 23:00 of a 1st time slot | zone, and adjusts the discharge start time similar to the above. As a result, the remaining amount of the storage battery at 23:00 on the rainy day will be adjusted until it reaches the minimum, and the completion of the discharge of the storage battery will end between 17:00 and 23:00, which is the second time zone at night. .

  On the other hand, when electricity remains in the storage battery 4 and the weather result is clear, the controller 11 starts charging the storage battery 4 without changing the discharge start time (S306). The remaining amount of the storage battery 4 is equal to or greater than the minimum remaining amount because the weather forecast is off and the amount of sunshine during the day is large, and since the discharge start time is not the cause, there is no need to change the discharge start items. .

  Further, it is determined whether or not more electricity than the minimum remaining amount remains in the storage battery 4 (S301), and if the electricity remaining in the storage battery 4 is equal to or less than the minimum remaining amount, the controller 11 refers to the discharge end time. In step S304, it is determined whether or not the discharge end time is in the second time zone (17:00 to 23:00). When the discharging time is in the second time zone, the controller 11 starts charging without changing the parameter of the charging start time (S306). After charging starts, the controller 11 waits until the next morning while monitoring the charging status.

(Embodiment 2)
FIG. 8 is a graph showing the power consumption, power generation, and storage battery status during rainy weather. An example is shown in which the discharge start time is set to 7 o'clock on the rain forecast date and the discharge is completed by 17:00. When the amount of power consumed in the daytime is small, the controller 11 performs control so that the discharge start time of the storage battery 4 is advanced. However, when the power consumption increases in summer or severe cold season, the controller 11 increases the discharge start time in rainy weather. In this case, as shown in FIG. 8 (c), the discharge of the storage battery ends during the third time period, and it is uneconomical because it is necessary to purchase power in the third time period when the power rate is high. Thus, such a case can be solved by lowering the discharge start time as shown in FIG.

  Specifically, referring to the discharge end time (S304), the discharge end time of the storage battery 4 ends in the third time zone (10:00 to 17:00) instead of the second time zone (17:00 to 23:00). If so, the discharge start time on the rainy forecast day is delayed (S305). After changing the discharge start time, the controller 11 starts charging the storage battery 4 via the charge / discharge control device 10 (S306). After the start of charging, the controller 11 waits until the next morning while monitoring the charging status.

(Embodiment 3)
In the first embodiment, the weather result of the day is used as information for determining whether or not to adjust the discharge time on the rainy weather forecast day. good. FIG. 9 is a graph showing an example of control of the power system on a rainy day. As shown in FIG. 9 (a), the amount of sunshine is not limited even though the controller 11 controls the rainy weather forecast day based on the rainy weather forecast and predicting the power generation amount as shown by the dotted line. The amount of power generation increases as shown by the solid line at most, and the storage battery 4 does not reach the minimum remaining amount by the end of the second time zone (23:00) as shown by the solid line in FIG. 9C. .

  At this time, as in (S302) of the flowchart of FIG. 7, it was determined whether or not to accelerate the discharge time using the weather information of the day, but instead of (S302), the power generation amount of the solar cell 1 on the day is It can be determined based on whether or not it is larger than a predetermined value. If the power generation amount of the solar cell 1 on that day is larger than a predetermined value, it is considered that the day was fine, and the discharge time on the rainy weather forecast day is not lowered. Conversely, if the power generation amount of the solar cell 1 on that day is smaller than a certain threshold value, it is assumed that the day was rainy, and control is performed so as to advance the discharge start time on the rainy weather forecast day. Depending on the region, the weather information may not match the local weather. However, by adjusting the discharge start time at the time of rainy weather forecast based on the power generation amount of the solar cell 1, the appropriate discharge start time can be adjusted. It becomes possible. In addition, the threshold value of the power generation amount can be determined by the sunshine condition of the installation place of the solar cell, the condition of the power generation system, or the like.

  As described above, by adjusting the discharge start time of the storage battery on a rainy day forecast day, it is possible to use up the electric power charged in a time zone where the electricity bill is cheap, and to reduce the electricity bill.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... Solar cell 2 ... Generated power measuring part 3 ... DC / DC converter 4 ... Storage battery 5 ... DC / DC converter 6 ... Electric power system 7 ... DC / AC inverter 8 ... Power selling measuring part 9 ... Purchased power measuring part 10 ... Charging Discharge control device 11 ... Controller 12 ... Load 13 ... Electric power system

Claims (5)

A solar battery capable of supplying the generated power to the load and capable of reverse power flow to the power system; and a storage battery capable of charging the power supplied from the power system and discharging the charged power to be supplied to the load An electric power system including a controller for controlling charging / discharging of the storage battery,
The power charge of the power system varies depending on the time zone, and the time zone includes at least a first time zone in which a predetermined fee is set and a second time zone in which a charge higher than the first time zone is set. Having a third time zone in which a higher charge is set than the second time zone;
The second time zone is a time zone sandwiched between the first time zone and the third time zone,
The storage battery is charged in the first time zone, and in the case of a rainy weather forecast day, the battery starts discharging at a predetermined discharge start time in the second time zone following the first time zone,
The controller is configured to adjust a discharge start time of the storage battery on a next rainy weather forecast day with reference to a remaining amount of the battery after discharging on the rainy forecast day.   The power system according to claim 1, wherein the controller adjusts a discharge start time of the storage battery on a next rainy weather forecast day with reference to a weather result on the rainy weather forecast day.   2. The power system according to claim 1, wherein the controller adjusts a discharge start time of the storage battery on a next rainy weather forecast day with reference to a power generation amount of the solar battery on the rainy weather forecast date. It has a solar cell that can supply the generated power to the load and can reversely flow to the power system, and a storage battery that can charge the power supplied from the power system and discharge the charged power and supply it to the load. A controller for controlling charging and discharging of the storage battery of the power system,
The power charge of the power system varies depending on the time zone, and the time zone includes at least a first time zone in which a predetermined fee is set and a second time zone in which a charge higher than the first time zone is set. Having a third time zone in which a higher charge is set than the second time zone;
The second time zone is a time zone sandwiched between the first time zone and the third time zone,
In the case of a rainy weather forecast day, the storage battery charged in the first time zone is started to discharge at a predetermined discharge start time in a second time zone following the first time zone, and the rainy day A controller that performs control so as to adjust the discharge start time of the storage battery on the next rainy weather forecast day with reference to the remaining amount of the storage battery after discharging on a forecast day. A solar battery capable of supplying the generated power to the load and capable of reverse power flow to the power system; and a storage battery capable of charging the power supplied from the power system and discharging the charged power to be supplied to the load , A method for controlling an electric power system including a controller for controlling charging / discharging of the storage battery,
The power charge of the power system varies depending on the time zone, and the time zone includes at least a first time zone in which a predetermined fee is set and a second time zone in which a charge higher than the first time zone is set. Having a third time zone in which a higher charge is set than the second time zone;
The second time zone is a time zone sandwiched between the first time zone and the third time zone,
The storage battery is charged in the first time zone, and in the case of a rainy weather forecast day, it starts discharging at a predetermined discharge start time in a second time zone following the first time zone,
The controller is a control method for an electric power system that adjusts the discharge start time of the storage battery on the next rainy weather forecast day with reference to the remaining amount of the battery after discharging on the rainy forecast day.

Images