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

Abstract

To suppress an amount of power purchase from grid power during the daytime.SOLUTION: A charge / discharge control unit 10 includes: a weather forecast acquisition section 11A acquiring a weather forecast for an area where a building is located; and a control section 11E executing first control at night on a reference date. The first control is such control that an electric vehicle 110A is charged regardless of a weather forecast for the next day of the reference date, and, if the weather forecast for the next day of the reference date is sunny, the remaining power of a storage battery 40 is discharged to a load in the building, while, if there is no remaining power, purchased grid power is discharged to the load in the building, and, if the weather forecast for the next day of the reference date is rainy, when the remaining power amount is greater than a predetermined first reference amount, the remaining power of the storage battery 40 is discharged to the load in the building until the remaining power amount of the power storage 40 is reduced to the first reference amount, while, when the remaining power amount is less than the first reference amount, the purchased grid power is charged to the storage battery 40 until the remaining power amount is increased to the first reference amount, and the reference amount is kept by discharging to the load in the building.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a charge-discharge control device, a program, and a charge-discharge control method.

Background Art

[0002] Patent Document 1 below discloses a charging control system in a building equipped with a solar power generation facility, a stationary battery, and an electric vehicle. In this charging control system, the electric power generated by the solar power generation facility can be charged into the stationary battery and the battery of the electric vehicle. Thereby, the amount of power purchased from the power grid can be suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the charging control system of Patent Document 1 above, it is described that it is possible to determine whether to charge a stationary battery with the power from the power grid based on whether it is at night when the unit price of commercial power supplied from the power grid is low. However, there are cases where power generation by the solar power generation facility is not possible, such as when the weather is cloudy or rainy. In such cases, it is necessary to purchase power from the power grid during the daytime when the unit price is high.

[0005] In consideration of the above facts, an object of the present invention is to provide a charge-discharge control device, a program, and a charge-discharge control method that can suppress the purchase of grid power during the daytime.

Means for Solving the Problems

[0006] The first embodiment of the charge / discharge control device is a charge / discharge control device for a building equipped with a solar power generation device, a storage battery, an electric vehicle, and a vehicle charge / discharge facility, comprising: a weather forecast acquisition unit that acquires a weather forecast for the area where the building is located; and a control unit that performs a first control at night on a reference day, wherein the first control charges the electric vehicle regardless of the weather forecast for the day following the reference day, and if the weather forecast for the day following the reference day is sunny, it discharges the remaining power of the storage battery to the load inside the building, while if there is no remaining power, it discharges purchased grid power to the load inside the building, and if the weather forecast for the day following the reference day is rain, if the remaining power of the storage battery is greater than a predetermined first reference amount, it discharges the remaining power of the storage battery to the load inside the building until it reaches the first reference amount, while if the remaining power is less than the first reference amount, it charges the storage battery with purchased grid power and discharges it to the load inside the building until it reaches the first reference amount, thereby conserving the first reference amount.

[0007] The charge / discharge control device of the first embodiment performs the following first control.

[0008] First, the electric vehicle is charged overnight on the reference day, regardless of the weather forecast for the following day. This allows the electric vehicle to be used the day after the reference day. Also, if plans change the day after the reference day and the electric vehicle is not used, the electricity stored in the electric vehicle can be discharged to the building's internal loads.

[0009] Furthermore, the control unit switches between discharging and conserving the remaining power of the battery in accordance with the weather forecast for the following day, during the nighttime hours of the reference day.

[0010] For example, if the weather forecast for the day after the reference date is sunny, it is expected that the electricity generated by the solar power system during the daytime on the following day will be discharged to the building's loads. In this case, the remaining power in the battery will be discharged to the building's loads during the night of the reference date. On the other hand, if it rains on the reference date and no power is generated, and there is no remaining power in the battery, then cheaper grid electricity will be purchased at night and discharged to the building's loads.

[0011] For example, if the weather forecast for the next day is rain, the remaining power in the battery is conserved during the night of the reference day. On the other hand, if the battery has little remaining power, such as when it rains on the reference day and power generation is not possible, electricity from the cheaper grid at night is purchased and used to charge the battery. As a result, a predetermined first reference amount of power is carried over to the daytime of the next day as battery power. During the daytime of the next day, the remaining power in the battery can be discharged to the building's loads. This helps to reduce the need to purchase expensive grid electricity during the daytime of the next day.

[0012] The second embodiment of the charge / discharge control device includes a schedule acquisition unit that acquires the planned use of the electric vehicle, and the control unit executes the first control if there is a planned use of the electric vehicle on the day following the reference date, and if there is no planned use of the electric vehicle on the day following the reference date, it executes the second control at night on the reference date, and if the weather forecast for the day following the reference date is sunny, the second control discharges the remaining power of the storage battery to the building load and then discharges the remaining power of the electric vehicle to the building load, while if there is no remaining power, it discharges purchased grid power to the building load, and if the weather forecast for the day following the reference date is rain, if the remaining power of the storage battery is greater than a predetermined second reference amount, it will discharge the storage battery until it reaches the second reference amount. This control system discharges the remaining power of the battery to the building's load, while if the remaining power is less than the second reference amount, it charges the battery with purchased grid power and discharges the purchased grid power to the building's load until it reaches the second reference amount, thereby preserving the second reference amount. Furthermore, if the remaining power of the electric vehicle is greater than a predetermined third reference amount, it discharges the remaining power of the electric vehicle to the building's load until it reaches the third reference amount, while if the remaining power is less than the third reference amount, it charges the electric vehicle with purchased grid power and discharges the purchased grid power to the building's load until it reaches the third reference amount, thereby preserving the third reference amount.

[0013] The charge / discharge control device of the second embodiment performs the following second control.

[0014] If there are no plans to use the electric vehicle on the day following the reference date, the system will switch between discharging and conserving the remaining power in the electric vehicle, as well as the battery, according to the weather forecast for the following day.

[0015] For example, if the weather forecast for the next day is sunny, the remaining power in the battery is discharged to the building's loads first, and then the remaining power in the electric vehicle is discharged to the building's loads. This results in more remaining power in the electric vehicle compared to discharging in the reverse order. Therefore, it is easier to use the electric vehicle even if there is a sudden change in plans.

[0016] For example, if the weather forecast for the next day is rain, the remaining power in the battery will be conserved during the night of the reference day. On the other hand, if the battery has little remaining power, such as when it rained on the reference day and power generation was not possible, electricity from the cheaper grid at night will be purchased and used to charge the battery. Similarly, the remaining power in the electric vehicle will be conserved during the night of the reference day. On the other hand, if the electric vehicle was used on the reference day, or if it rained on the reference day and power generation was not possible, and the electric vehicle has little remaining power, electricity from the cheaper grid at night will be purchased and used to charge the battery.

[0017] As a result, the battery's power is carried over to the second reference amount, and the electric vehicle's power is carried over to the third reference amount during the daytime on the following day. Since the electric vehicle is not scheduled to be used on the day following the reference date, it can be discharged not only from the battery but also from the electric vehicle to the building's load. Therefore, it is sufficient to retain a second reference amount in the battery, which is less than the first reference amount in the first control. This helps to reduce the need to purchase high levels of grid electricity during the daytime the following day.

[0018] The charge / discharge control device of the third embodiment is a control device in which the control unit performs the third control when the electric vehicle is out during the daytime on the day following the reference date, and the third control is a control device in which, if the weather is sunny, the power generated by the solar power generation device is discharged to the load inside the building and the battery is charged, and if the weather is rainy, if the remaining power of the battery is greater than the second reference amount, the remaining power of the battery is discharged to the load inside the building until it reaches the second reference amount, while if the remaining power is less than or equal to the second reference amount, the battery is not charged, thereby conserving the second reference amount.

[0019] The charge / discharge control device of the third embodiment performs the following third control when the electric vehicle is out.

[0020] In the third control, on the day after the reference day, charging to the storage battery, discharging of remaining power, and retention are switched according to the "actual weather".

[0021] If the weather on the next day is sunny, the power generated by the solar power generation device is charged to the storage battery.

[0022] If the weather on the next day is rainy, the remaining power of the storage battery is discharged to the building load until it reaches the second reference amount, and when the remaining power becomes less than or equal to the second reference amount, the discharging is stopped. And the storage battery is not charged.

[0023] Here, if the weather forecast for the day after the reference day is rainy, since the remaining power of the storage battery is retained as described above or power is purchased at night on the reference day, the remaining power of the storage battery can be used during the day on the next day. Thereby, even if the next day is rainy, it is possible to suppress purchasing high-cost grid power during the day.

[0024] On the other hand, if the weather forecast for the day after the reference day is sunny, since the remaining power of the storage battery is discharged at night on the reference day, the remaining power of the storage battery is small. Nevertheless, if the weather forecast is wrong and it rains, it is necessary to purchase high-cost power during the day. In this case, during the day, the storage battery is not charged and only the power discharged to the building load is purchased. Thereby, the power purchase amount during the day can be minimized.

[0025] In the charge / discharge control device of the fourth aspect, when the electric vehicle is connected to the vehicle charge / discharge facility during the day on the day after the reference day, the control unit performs fourth control. The fourth control is that if the weather is sunny, the power generated by the solar power generation device is discharged to the building load and after charging the electric vehicle, it is charged to the storage battery. If the weather is rainy, when the remaining power amount of the storage battery is more than the second reference amount, the remaining power of the storage battery is discharged to the building load until it reaches the second reference amount. On the other hand, when the remaining power amount is less than or equal to the second reference amount, the storage battery is not charged. Further, when the remaining power amount of the electric vehicle is more than a predetermined fourth reference amount, the remaining power of the electric vehicle is discharged to the building load until it reaches the fourth reference amount. On the other hand, when the remaining power amount is less than the fourth reference amount, the control is not to charge the electric vehicle.

[0026] When the electric vehicle is connected to the vehicle charging and discharging facility, the charge-discharge control device of the fourth aspect performs the following fourth control.

[0027] If the weather the next day is sunny, regardless of the weather forecast for the next day on the reference day, the power generated by the solar power generation device is charged to the storage battery after charging the electric vehicle. By preferentially charging the electric vehicle, it is possible to cope with the case where the electric vehicle suddenly needs to be used.

[0028] If the weather the next day is rainy, discharge to the building load until the remaining power of the electric vehicle reaches the fourth reference amount, and stop discharging when the remaining power becomes less than or equal to the fourth reference amount. Then, do not charge the electric vehicle and the storage battery.

[0029] Here, if the weather forecast for the next day on the reference day is rainy, the remaining power of the electric vehicle is stored as described above or power is purchased at night on the reference day. Also, if the plan has changed even though the electric vehicle was planned to be used, it is charged at night on the reference day. Therefore, during the day of the next day, the remaining power of the electric vehicle can be used. As a result, even if the next day is rainy, it is possible to suppress purchasing high-cost grid power during the day.

[0030] On the other hand, if the weather forecast for the next day on the reference day is sunny and there is no planned use of the electric vehicle, since the remaining power of the electric vehicle and the storage battery is discharged at night on the reference day, the remaining power of the electric vehicle and the storage battery is small. Nevertheless, if the weather forecast is incorrect and it rains, it is necessary to purchase high-cost power during the day. In this case, during the day, do not charge the electric vehicle and the storage battery, and only purchase the power discharged to the building load. As a result, the amount of power purchased during the day can be reduced.

[0031] The charge-discharge control device according to claim 4, wherein the charge-discharge control device of the fifth embodiment includes a unit price acquisition unit that acquires the unit price for selling electricity generated by a solar power generation device and the unit price for purchasing grid power, and the control unit sells the electricity generated by the solar power generation device and purchases grid power when the unit price for selling electricity exceeds the unit price for purchasing electricity during the day, and performs the first control, the second control, the third control and the fourth control when the unit price for selling electricity is less than or equal to the unit price for purchasing electricity during the day.

[0032] In the fifth embodiment of the charge / discharge control device, the first to fourth controls are implemented when the selling price of electricity generated by the solar power generation device is less than or equal to the daytime purchase price of electricity, i.e., when the selling price of electricity is low.

[0033] In the first control system, if the weather forecast for the following day is sunny, the remaining power from the battery is discharged to the building's load during the night of the reference day. In the second control system, if the weather forecast for the following day is sunny, the remaining power from the battery and the electric vehicle is discharged to the building's load during the night of the reference day.

[0034] In the third control system, if the weather forecast for the following day is rain, the remaining power from the battery is discharged to the building's load during the daytime on that day. In the fourth control system, if the weather forecast for the following day is rain, the remaining power from both the battery and the electric vehicle is discharged to the building's load during the daytime on that day.

[0035] Thus, when the price of electricity sold back to the grid is low, the electricity generated by solar power systems and stored in batteries or electric vehicles is consumed by the loads within the building. It is also consumed when the electric vehicles are driven. This helps to reduce the amount of electricity purchased from the relatively expensive grid.

[0036] On the other hand, if the selling price of electricity generated by a solar power system exceeds the daytime purchase price, i.e., if the selling price is high, the electricity generated by the solar power system is sold and grid electricity is purchased. This allows for a profit to be made.

[0037] The sixth embodiment of the program is a program for a charge / discharge control device in a building equipped with a solar power generation device, a storage battery, an electric vehicle, and a vehicle charging / discharging facility, wherein the computer functions as a weather forecast acquisition unit that acquires the weather forecast for the area where the building is located, and a control unit that performs a first control at night on a reference day, and the first control charges the electric vehicle regardless of the weather forecast for the day following the reference day, and if the weather forecast for the day following the reference day is sunny, it discharges the remaining power of the storage battery to the load inside the building, while if there is no remaining power, it discharges purchased grid power to the load inside the building, and if the weather forecast for the day following the reference day is rain, if the remaining power of the storage battery is greater than a predetermined first reference amount, it discharges the remaining power of the storage battery to the load inside the building until it reaches the first reference amount, while if the remaining power is less than the first reference amount, it charges the storage battery with purchased grid power and discharges it to the load inside the building until it reaches the first reference amount, thereby conserving the first reference amount.

[0038] The seventh embodiment of the charge / discharge control method is a control method for a building equipped with a solar power generation device, a storage battery, an electric vehicle, and a vehicle charge / discharge equipment, in which the weather forecast for the area where the building is located is obtained, a first control is performed at night on the reference day, the first control charges the electric vehicle regardless of the weather forecast for the day following the reference day, and if the weather forecast for the day following the reference day is sunny, the remaining power of the storage battery is discharged to the load inside the building, while if there is no remaining power, purchased grid power is discharged to the load inside the building, and if the weather forecast for the day following the reference day is rain, if the remaining power of the storage battery is greater than a predetermined first reference amount, the remaining power of the storage battery is discharged to the load inside the building until it reaches the first reference amount, while if the remaining power is less than the first reference amount, purchased grid power is charged to the storage battery and discharged to the load inside the building until it reaches the first reference amount, thereby conserving the first reference amount. [Effects of the Invention]

[0039] According to the present invention, it is possible to reduce the purchase of grid electricity during the daytime. [Brief explanation of the drawing]

[0040] [Figure 1] This is a block diagram showing the overall view of a charge / discharge control system to which the charge / discharge control device according to the embodiment is applied. [Figure 2] This block diagram shows the electrical configuration of a charge / discharge control device according to an embodiment. [Figure 3] This is a functional block diagram showing the functional configuration of a charge / discharge control device according to an embodiment. [Figure 4] (A) is a table showing the contents of the first control stored in the control information database according to the embodiment, and (B) is a table showing the contents of the second control. [Figure 5] (A) is a table showing the contents of the third control stored in the control information database according to the embodiment, and (B) is a table showing the contents of the second control. [Figure 6] This flowchart shows an example of the charge / discharge control process according to the embodiment. [Modes for carrying out the invention]

[0041] Hereinafter, a charge / discharge control device, program, and charge / discharge control method according to embodiments of this disclosure will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are considered to be the same component. However, unless otherwise specified in the specification, each component is not limited to one, and there may be multiple such components.

[0042] Furthermore, explanations of redundant components and reference numerals in each drawing may be omitted. This disclosure is not limited to the following embodiments, and modifications may be made as appropriate, such as omitting components or substituting them with different components, within the scope of the purpose of this disclosure.

[0043] <Charge / Discharge Control System> (overview) Figure 1 shows the overall configuration of a charge / discharge control system 80 according to an embodiment of the present invention. The charge / discharge control system 80 is a system for controlling the power supply to a building 100 equipped with a storage battery 40 and a vehicle charge / discharge facility 60 for charging an electric vehicle 110A.

[0044] The charge / discharge control system 80 is a system aimed at suppressing the purchase of grid power during the daytime. More specifically, the charge / discharge control system 80 controls the charging of the battery 40 and the electric vehicle 110A, and the discharging from the battery 40 and the electric vehicle 110A, during the night on the reference day and during the daytime on the day following the reference day, based on the weather forecast for the day following the reference day and the planned usage of the electric vehicle 110A on the day following the reference day, thereby suppressing the purchase of electricity during the daytime on the day following the reference day.

[0045] The term "reference date" is a convenient indication of the day on which the charge / discharge control system 80 performs nighttime charge / discharge control, and does not refer to a specific date.

[0046] The charge / discharge control system 80 comprises a charge / discharge control device 10 (hereinafter referred to as the control device 10) and a conversion device 20. The charge / discharge control system 80 also comprises a solar power generation device 30, a storage battery 40, a distribution board 50, and a vehicle charge / discharge equipment 60.

[0047] (building) In this specification, the building 100 to which the charge / discharge control system 80 is applied is described as a detached house, but the embodiments of the present invention are not limited to this. The charge / discharge control system 80 can be applied to apartment buildings as well as detached houses, and can also be applied to non-residential facilities such as office buildings, commercial facilities, hospitals, and libraries.

[0048] (Solar power generation equipment) The solar power generation system 30 is installed on the roof surface of the building 100 and is equipped with solar cells that generate electricity when exposed to sunlight. The solar power generation system 30 is a power source whose generated power fluctuates over time depending on the season and sunlight conditions. The solar power generation system 30 is connected to the converter 20, and the power generated by the solar power generation system 30 is supplied to the converter 20.

[0049] (Battery storage) The battery 40 is a stationary battery installed in the building 100. The battery 40 is equipped with a secondary battery, such as a lithium-ion battery. The battery 40 is connected to the converter 20 and is charged by the power supplied from the converter 20. The battery 40 can also supply power to the converter 20 by discharging.

[0050] (Distribution board) The distribution board 50 distributes AC power from the power grid 70 to the loads 90, which are electrical equipment within the building 100. The distribution board 50 is supplied with AC power from the power grid 70. The loads 90 are connected to branch circuits that are connected to the distribution board 50. The branch circuits are supplied with AC power from the distribution board 50, and the loads 90 operate using the AC power supplied to the branch circuits. Furthermore, the distribution board 50 is connected to a converter 20 and can supply AC power to the converter 20.

[0051] (Vehicle charging and discharging equipment) The vehicle charging and discharging equipment 60 is equipment for charging electric vehicles 110A with electricity generated by the solar power generation device 30, electricity stored in the battery 40, and grid electricity (commercial electricity) purchased from the power grid 70.

[0052] The vehicle charging and discharging equipment 60 is equipped with a connector 60A as a connection terminal that can be detachably connected to the charging connector of the electric vehicle 110A. The electric vehicle 110A has a built-in battery 112A and runs using the electrical energy stored in the battery 112A. The vehicle charging and discharging equipment 60 is connected to the converter 20, and the battery 112A is charged by the power supplied from the converter 20. The battery 112A can also supply power to the converter 20 via the vehicle charging and discharging equipment 60 by discharging.

[0053] As electric vehicle 110A, this can apply to electric vehicles that run on the output of an electric motor, as well as plug-in hybrid vehicles that run by combining the output of an engine and the output of an electric motor.

[0054] (Converter) The operation of the converter 20 is controlled by the control device 10. The converter 20 is connected to the solar power generation device 30. The converter 20 can boost the DC voltage from the solar power generation device 30.

[0055] The converter 20 can convert the DC power output by the battery 40 into DC power of a predetermined magnitude. The converter 20 can also convert the DC power into DC power of a predetermined magnitude and output the converted DC power to the battery 40.

[0056] The converter 20 can convert the DC power output by the battery 112A into DC power of a predetermined magnitude. Furthermore, the converter 20 can convert the DC power into DC power of a predetermined magnitude and output the converted DC power to the battery 112A.

[0057] The converter 20 can convert DC voltage to AC voltage, or AC voltage to DC voltage, between the power grid 70 and the "photovoltaic power generation device 30, battery 40, and battery 112A". As a result, the converter 20 has the function of converting DC power from the "photovoltaic power generation device 30, battery 40, and battery 112A" into AC power and outputting it to the "load 90 and power grid 70", and the function of converting AC power from the power grid 70 into DC power and outputting it to the "battery 40 and battery 112A".

[0058] <Control device> The control device 10, as an example of a charge / discharge control device in the present invention, is a device that performs power management and control in a building 100, and is also referred to as, for example, HEMS (Home Energy Management System).

[0059] The control device 10 can charge the storage battery 40 or storage battery 112A with the power generated by the solar power generation device 30 via the converter 20. Alternatively, it can supply the power generated by the solar power generation device 30 to the load 90 connected to the distribution board 50 or to the power grid 70 via the converter 20.

[0060] Furthermore, the control device 10 can charge the storage battery 40 and storage battery 112A with power supplied from the power grid 70 via the converter 20. In addition, the control device 10 can control the order and amount of charging of the storage battery 40 and storage battery 112A.

[0061] Furthermore, the control device 10 can supply the power charged in the storage battery 40 to the load 90 connected to the distribution board 50 via the converter 20. In addition, the control device 10 can supply the power charged in the storage battery 112A to the load 90 connected to the distribution board 50 and the power system 70 via the converter 20.

[0062] [Electrical configuration of the control device] Figure 2 shows a block diagram illustrating the electrical configuration of the control device 10. The control device 10 comprises a CPU (Central Processing Unit: processor) 11, a memory 12 as a temporary storage area, a non-volatile storage unit 13, an input unit 14 such as a keyboard and mouse, a display unit 15 such as a liquid crystal display, a media read / write (R / W) device 16, a communication interface (I / F) unit 18, and an external I / F unit 19. The CPU 11, memory 12, storage unit 13, input unit 14, display unit 15, media read / write device 16, communication I / F unit 18, and external I / F unit 19 are connected to each other via bus B1. The media read / write device 16 reads information written to the recording medium 17 and writes information to the recording medium 17.

[0063] (Storage part) The storage unit 13 is implemented by an HDD (Hard Disk Drive), SSD (Solid State Drive), flash memory, etc. The storage unit 13, as a storage medium, stores a charge / discharge control program 13A. The charge / discharge control program 13A is stored in the storage unit 13 when a recording medium 17 on which the charge / discharge control program 13A is written is set in a media read / write device 16, and the media read / write device 16 reads the charge / discharge control program 13A from the recording medium 17. The CPU 11 reads the charge / discharge control program 13A from the storage unit 13, loads it into memory 12, and sequentially executes the processes contained in the charge / discharge control program 13A.

[0064] The memory unit 13 stores the control information database 13B. Details of this control information database 13B will be described later.

[0065] (Input section) In the input unit 14, the user performs operations to start and stop the charge / discharge control program 13A. The user is, for example, a resident of building 100 and the administrator of the charge / discharge control system 80.

[0066] Furthermore, the user inputs "planned usage information" for the electric vehicle 110A into the input unit 14. The "planned usage information" input via the input unit 14 can be stored in a predetermined area in the storage unit 13.

[0067] The "planned usage information" entered by the user may be entered via the user's mobile device, such as a smartphone. Alternatively, it may be entered via a computer different from the control device 10. Personal information entered via the user's mobile device or a computer different from the control device 10 is transmitted to the control device 10.

[0068] (Display) The display unit 15 displays information for starting and ending the charge / discharge control program 13A, as well as information for inputting "planned usage information." The display unit 15 may also have a touch panel interface for the user to input "planned usage information." In other words, the display unit 15 and the input unit 14 can be integrated using a touch panel.

[0069] [Functional configuration of the control unit] Next, with reference to Figure 3, the functional configuration of the control device 10 according to this embodiment will be described. As shown in Figure 3, the control device 10 includes a weather forecast acquisition unit 11A, a schedule acquisition unit 11B, a weather acquisition unit 11C, a vehicle detection unit 11D, and a control unit 11E. The CPU 11 of the control device 10 functions as the weather forecast acquisition unit 11A, the schedule acquisition unit 11B, the weather acquisition unit 11C, the vehicle detection unit 11D, and the control unit 11E by executing the charge / discharge control program 13A.

[0070] (Weather forecast acquisition department) The weather forecast acquisition unit 11A acquires the weather forecast for the day following the reference date for the area where building 100 is located. The "weather information" includes not only weather conditions such as rain and sunshine, but also the expected solar radiation [kWh / m2 / day] and the average daily temperature [°C] for the area where building 100 is located.

[0071] (Planned acquisition section) The schedule acquisition unit 11B acquires the scheduled usage information for the electric vehicle 110A on the day following the reference date. The schedule acquisition unit 11B acquires the scheduled usage information in response to the user entering the scheduled usage information into the input unit 14.

[0072] "Planned usage information" refers to information including whether or not the electric vehicle 110A will be used on the day following the reference date. This "usage information" is information on whether or not the user plans to use the electric vehicle 110A on the day following the reference date, and is acquired by the schedule acquisition unit 11B when the user enters the planned usage date of the electric vehicle 110A into the input unit 14.

[0073] Furthermore, it is preferable that the "planned usage information" includes mileage information. "Mileage information" refers to information indicating the planned mileage. Mileage information is acquired by the planned acquisition unit 11B when the user inputs the planned mileage when they plan to use the electric vehicle 110A on a reference day.

[0074] For the planned distance to travel, it is not necessary to input the distance itself as a numerical value; for example, the destination can be entered. If a destination is entered, the CPU 11 can obtain the necessary information via the communication interface 18 and calculate an estimate of the round-trip distance from building 100 to the destination.

[0075] It should be noted that the "usage status information" and "mileage information" do not necessarily need to be entered by the user. For example, the control device 10 can obtain the past usage dates and mileage of the electric vehicle 110A by communicating with the communication device provided by the electric vehicle 110A via the communication I / F unit 18.

[0076] The control device 10 can generate a "usage history database (not shown)" by storing past usage dates and mileage in the storage unit 13. The schedule acquisition unit 11B may predict "usage status information" and "mileage information" for the day following the reference date from this usage history database.

[0077] Furthermore, if the planned usage information is stored in the storage unit 13, the planned usage acquisition unit 11B may read and acquire the planned usage information from the storage unit 13.

[0078] (Weather acquisition department) Meanwhile, the weather acquisition unit 11C acquires actual weather information for the day following the reference date in the area where the building 100 is located.

[0079] (Vehicle detection unit) The vehicle detection unit 11D acquires "connection information" indicating whether the connector 60A of the vehicle charging / discharging equipment 60 is connected to the electric vehicle 110A, in response to the user connecting and disconnecting the connector 60A of the vehicle charging / discharging equipment 60 to the electric vehicle 110A. Whether or not the connector 60A is connected to the electric vehicle 110A is stored in a predetermined area of ​​the storage unit 13.

[0080] (Control Unit) The control unit 11E controls the converter 20 based on the "weather information" acquired by the weather forecast acquisition unit 11A and the "scheduled usage information" acquired by the schedule acquisition unit 11B, and performs charging of the storage battery 40 and electric vehicle 110A, discharging from the storage battery 40 and electric vehicle 110A, and purchasing electricity from the power grid 70 on the reference day (first control and second control, described later).

[0081] Furthermore, the control unit 11E controls the converter 20 based on the actual "weather information" acquired by the weather acquisition unit 11C and the "connection information" of the electric vehicle 110A acquired by the vehicle detection unit 11D, and performs charging of the storage battery 40 and the electric vehicle 110A, discharging from the storage battery 40 and the electric vehicle 110A, and purchasing electricity from the power grid 70 during the daytime on the day following the reference date (third control and fourth control described later).

[0082] Specifically, the control unit 11E reads the control information database 13B stored in the memory unit 13 and uses the information stored in this control information database 13B to execute the charge / discharge control program 13A, which will be described later.

[0083] (Control Information Database) The control information database 13B stores the first to fourth controls shown in Figures 4(A), (B), and 5(A), (B). Each control is explained separately for the case where the reference day or the day after the reference day is "sunny" and the case where it is "rainy". In the present invention, instead of separating into "sunny" and "rainy" cases, the power generation amount of the solar power generation device 30 may be separated into cases where it is above a predetermined threshold and cases where it is below a predetermined threshold.

[0084] (First control) The first control is executed at night on the reference day, when the rate for grid electricity is cheaper than during the day. The first control is also executed if there is a planned use of 110A by electric vehicles on the day following the reference day.

[0085] Figure 4(A) shows the control procedures separately for the case where the daytime on the reference day was sunny and the case where it was rainy, for the sake of explanation. However, the control procedures are the same regardless of the daytime weather on the reference day.

[0086] In this first control, the control unit 11E charges the battery 112A of the electric vehicle 100A regardless of the weather forecast for the day following the reference date.

[0087] Here, "A1%" in Figure 4(A), etc., refers to the remaining power of the battery 112A when the daytime is sunny on the reference day. This remaining power includes the power generated by the solar power generation device 30 and charged into the battery 112A.

[0088] On the other hand, "B1%" in Figure 4(A), etc., refers to the remaining power of the battery 112A when it rains during the daytime on the reference day. Since the solar power generation device 30 cannot generate electricity when it rains during the day, this remaining power does not include the electricity generated by the solar power generation device 30.

[0089] Furthermore, although Figure 4(A) shows that the battery 112A is fully charged, if the "planned usage information" of the electric vehicle 110A includes mileage information, it may be possible to charge only the power necessary to travel that mileage.

[0090] Furthermore, in the first control, if the weather forecast for the day following the reference date is "sunny," the remaining power in the battery 40 is discharged to the load inside the building. If there is no remaining power, the purchased grid power is discharged to the load 90 inside the building 100.

[0091] Here, "A2%" in Figure 4(A), etc., refers to the remaining power of the battery 40 when the daytime is sunny on the reference day. This remaining power includes the power generated by the solar power generation device 30 and charged into the battery 40.

[0092] On the other hand, "B2%" in Figure 4(A), etc., represents the remaining power of the battery 40 when it rains during the daytime on the reference day. Since the solar power generation device 30 cannot generate electricity when it rains during the day, this remaining power does not include the electricity generated by the solar power generation device 30.

[0093] Furthermore, in the first control, if the weather forecast for the day following the reference date is "rain," a predetermined first reference amount (for example, 50% of the fully charged amount) is preserved as the remaining power of the battery 40.

[0094] In this case, if the remaining power is greater than the first standard amount, the remaining power of the battery 40 is discharged to the load 90 until it reaches the first standard amount. After that, the purchased grid power is discharged to the load 90. On the other hand, if the remaining power is less than the first standard amount, the purchased grid power is charged to the battery until it reaches the first standard amount. Also, the purchased grid power is discharged to the load 90. If the remaining power is the first standard amount, the purchased grid power is discharged to the load 90.

[0095] (Second control) The second control, like the first control, is executed at night on the reference day when the rate for grid electricity is cheaper than during the day. Furthermore, the second control is executed if there are "no" planned uses of the 110A electric vehicle on the day following the reference day.

[0096] Figure 4(B) shows the control procedures separately for the case where the daytime on the reference day was sunny and the case where it was rainy, for the sake of explanation. However, the control procedures are the same regardless of the daytime weather on the reference day.

[0097] In the second control system, if the weather forecast for the day following the reference date is "sunny," the remaining power of battery 40 is discharged to load 90, and then the remaining power of battery 112A of the electric vehicle 110A is discharged to the load inside the building. In other words, the remaining power of battery 40 is discharged preferentially. If the remaining power of battery 40 and battery 112A runs out, or if there was never any power to begin with, the purchased grid power is discharged to load 90.

[0098] Furthermore, in the second control, if the weather forecast for the day following the reference date is "rain," a predetermined second reference amount (for example, 30% of the fully charged amount) is retained as the remaining power of battery 40. On the other hand, a predetermined third reference amount (for example, 50% of the fully charged amount) is retained as the remaining power of battery 112A. The second reference amount is a smaller value than the first reference amount.

[0099] In this case, if the remaining power of the battery 40 is greater than the second standard amount, the remaining power of the battery 40 is discharged to the load 90 until it reaches the second standard amount. After that, the purchased grid power is discharged to the load 90. On the other hand, if the remaining power is less than the second standard amount, the purchased grid power is charged to the battery 40 until it reaches the second standard amount. Also, the purchased grid power is discharged to the load 90. If the remaining power is the second standard amount, the purchased grid power is discharged to the load 90.

[0100] Furthermore, if the remaining power of battery 112A is greater than the third standard amount, the remaining power of battery 112A is discharged to load 90 until it reaches the third standard amount. After that, the purchased grid power is discharged to load 90. On the other hand, if the remaining power is less than the third standard amount, the purchased grid power is charged to battery 112A until it reaches the third standard amount. Then, the purchased grid power is discharged to load 90. If the remaining power is the third standard amount, the purchased grid power is discharged to load 90.

[0101] (Third control) The third control shown in Figure 5(A) is a control that is executed during the daytime on the day following the reference date. Furthermore, the third control is executed if connector 60A of electric vehicle 110A is not connected to electric vehicle 110A on the day following the reference date.

[0102] In the third control, if the actual daytime weather on the day following the reference date is "sunny," the power generated by the solar power generation device 30 is discharged to the load 90, and the storage battery 40 is charged as much as possible.

[0103] In this case, if there was a plan to use the electric vehicle 110A on the day before the reference date, the first reference amount is preserved in the battery 40, so the battery 40 is charged as much as possible from the first reference amount.

[0104] On the other hand, if there were no plans to use the electric vehicle 110A on the day before the reference date, only the second reference amount will be stored in the battery 40, so the battery 40 will be charged as much as possible from the second reference amount.

[0105] Furthermore, in the third control, if the actual daytime weather on the day following the reference date is "rain," and the remaining power of the battery 40 is greater than the second reference amount, the battery 40 will be discharged to the load 90 until its remaining power reaches the second reference amount. However, if the remaining power is less than or equal to the second reference amount, the battery 40 will not be charged, and the second reference amount will be preserved.

[0106] In this case, if there was a plan to use the electric vehicle 110A on the day before the reference date, the first reference amount is preserved in the battery 40, so the battery 40 is discharged to the load 90 until it reaches the second reference amount.

[0107] On the other hand, if there were no plans to use the electric vehicle 110A on the day before the reference date, only the second reference amount is stored in the battery 40, so no discharge occurs from the battery 40 to the load 90.

[0108] (Fourth control) The fourth control shown in Figure 5(B) is a control that is executed during the daytime on the day following the reference date. Furthermore, the fourth control is executed if connector 60A of electric vehicle 110A is connected to electric vehicle 110A on the day following the reference date.

[0109] In the fourth control, if the actual daytime weather on the day following the reference date is "sunny," the electricity generated by the solar power generation device 30 is discharged to the load 90, and after fully charging the battery 112A of the electric vehicle 110A, the battery 40 is charged.

[0110] Here, if there was a plan to use the electric vehicle 110A on the day before the reference date, and battery 40 is fully charged, then battery 40 will be charged as much as possible without charging battery 112A. If battery 40 is not fully charged, then battery 112A will be fully charged, and then battery 40 will be charged as much as possible.

[0111] On the other hand, if there were no plans to use the electric vehicle 110A on the day before the reference date, only the third reference amount remains in the battery 112A. Therefore, after fully charging from the third reference amount, the battery 40 is charged as much as possible. Only the second reference amount remains in the battery 40. Therefore, the battery 40 is charged as much as possible from the second reference amount.

[0112] Furthermore, in the fourth control, if the actual daytime weather on the day following the reference date is "rain," and the remaining power of the battery 40 is greater than the second reference amount, the battery 40 will be discharged to the load 90 until its remaining power reaches the second reference amount. However, if the remaining power is less than or equal to the second reference amount, the battery 40 will not be charged.

[0113] Furthermore, if the remaining power of the battery 112A is greater than a predetermined fourth standard amount (for example, 30%), the battery 40 will be discharged to the load 90 until its remaining power reaches the fourth standard amount. However, if the remaining power is less than or equal to the fourth standard amount, the battery 112A will not be charged.

[0114] Here, if there was a plan to use the electric vehicle 110A on the day before the reference date, the first reference amount is preserved in the battery 40, so it can be discharged from the battery 40 to the load 90 until it reaches the second reference amount. Also, since the battery 112A is fully charged, it can be discharged from the battery 112A to the load 90 until it reaches the fourth reference amount.

[0115] On the other hand, if there were no plans to use the electric vehicle 110A on the day before the reference date, only the second reference amount remains in the battery 40, so no discharge will occur from the battery 40 to the load 90. Also, since the third reference amount remains in the battery 112A, it can discharge to the load 90 until it reaches the fourth reference amount.

[0116] <effect> Next, the operation of the charge / discharge control system 80 according to this embodiment will be explained with reference to Figure 6. In response to execution instructions from the user via the input unit 14, the CPU 11 of the control device 10 executes the charge / discharge control program 13A, thereby executing the power control process shown in Figure 5.

[0117] To avoid confusion, this section will describe the case where the control information database 13B has been pre-configured.

[0118] (Charge / discharge control processing) When the charge / discharge control program 13A is started, in step 104, the CPU 11 waits for a predetermined time on the reference day. The "predetermined time" is the time when the electricity purchase price from the power grid 70 becomes cheaper than the daytime electricity purchase price. In other words, it is the time when the nighttime discount rate for electricity purchases begins. This predetermined time is determined according to the electricity contract details of the building 100. The CPU 11 repeatedly executes step 104 until the predetermined time arrives. When the predetermined time arrives, the process moves to step 106.

[0119] In step 106, CPU 11 obtains weather information (weather forecast) for the day following the reference date and the planned use of electric vehicles for the day following the reference date. After step 106, the process proceeds to step 108.

[0120] In step 108, the CPU 11 executes either the first or second control described above based on the information obtained in step 106. After step 108, the process proceeds to step 110.

[0121] In step 110, the CPU 11 waits for a predetermined time to arrive. Here, the "predetermined time" is the time when the electricity purchase price from the power grid 70 becomes the daytime electricity purchase price. In other words, it is the time when the period in which the nighttime discount price is applied to the electricity purchase price ends. This predetermined time is determined according to the electricity contract details of building 100. The CPU 11 repeatedly executes step 104 until the predetermined time arrives. When the predetermined time arrives, it proceeds to step 112.

[0122] In step 112, CPU 11 obtains the actual weather information for the day following the reference date and the connection information for the electric vehicle 110A. After step 112, the process proceeds to step 114.

[0123] In step 114, the CPU 11 executes the third or fourth control described above based on the information obtained in step 112. After step 114, the process proceeds to step 116.

[0124] In step 116, the CPU 11 determines whether the timing for the end of the charge / discharge control process has arrived. If the determination is positive, the charge / discharge control process is terminated. This termination timing is triggered, for example, by user input via the input unit 14. If the determination in step 116 is negative, the process returns to step 104.

[0125] <Effects> As described above, in the charge / discharge control device and program according to the embodiment of the present invention, the first control shown in Figure 4(A) is performed during the nighttime of the reference day.

[0126] First, during the night of the reference day, the electric vehicle 110A is charged regardless of the weather forecast for the following day. This ensures that the electric vehicle 110A can be used the day after the reference day. Also, as shown in the fourth control in Figure 5(B), if the schedule changes and the electric vehicle 110A is not used the day after the reference day, the power charged in the battery 112A of the electric vehicle 110A can be discharged to the load 90 inside the building 100.

[0127] Furthermore, the control unit 11E switches between discharging and conserving the remaining power of the battery 40 in accordance with the weather information (weather forecast) for the following day during the nighttime of the reference day.

[0128] For example, if the weather forecast for the day after the reference date is sunny, it is expected that the electricity generated by the solar power generation device 30 during the daytime on the following day will be discharged to the load 90, so the remaining power in the battery 40 will be discharged to the load 90 during the night of the reference date. On the other hand, if it rains on the reference date and no power can be generated, and there is little or no remaining power in the battery 40, then cheaper grid electricity will be purchased at night and discharged to the load 90.

[0129] For example, if the weather forecast for the next day is rain, the remaining power in the battery 40 will be conserved during the night of the reference day. On the other hand, if the battery 40 has little remaining power, such as when it rains on the reference day and power generation is not possible, electricity will be purchased from the cheaper grid at night and used to charge the battery 40.

[0130] As a result, a predetermined first reference amount of power is carried over to the next day as power for the battery 40. During the next day, the remaining power in the battery 40 can be discharged to the load 90. This helps to suppress the purchase of high grid power during the next day.

[0131] Furthermore, in the charge / discharge control device and program according to the embodiment of the present invention, the second control shown in Figure 4(B) is performed during the nighttime hours of the reference day.

[0132] If there are no plans to use the 110A electric vehicle on the day following the reference date, the system will switch between discharging and conserving the remaining power of not only the 40 battery but also the 112A battery in the 110A electric vehicle, depending on the weather information (weather forecast).

[0133] For example, if the weather forecast for the next day is sunny, the remaining power of battery 40 is discharged to load 90, and then the remaining power of battery 112A is discharged to load 90. This results in more remaining power in battery 112A compared to discharging in the reverse order. Therefore, even if there is a sudden change in plans and electric vehicle 110A needs to be used, it is easier to use electric vehicle 110A.

[0134] For example, if the weather forecast for the next day is rain, the remaining power in battery 40 is conserved during the night of the reference day. On the other hand, if the battery 40 has little remaining power, such as when it rained on the reference day and power generation was not possible, electricity from the cheaper grid at night is purchased and used to charge battery 40. Similarly, the remaining power in battery 112A is conserved during the night of the reference day. On the other hand, if the electric vehicle 110A was used on the reference day, or if it rained on the reference day and power generation was not possible, electricity from the cheaper grid at night is purchased and used to charge battery 112A.

[0135] As a result, the power from battery 40 is carried over to the second baseline amount, and the power from battery 112A is carried over to the third baseline amount, both during the daytime on the following day.

[0136] Since there is no planned use of the electric vehicle 110A on the day following the reference date, the battery 112A can discharge to the load 90 not only from battery 40 but also from battery 40. Therefore, it is sufficient to retain a second reference amount in battery 40 that is less than the first reference amount in the first control. This helps to suppress the purchase of high grid power during the daytime on the following day.

[0137] Furthermore, in the charge / discharge control device and program according to the embodiment of the present invention, if the electric vehicle 110A is out during the daytime on the day following the reference date, the third control shown in Figure 5(A) is performed.

[0138] In the third control system, on the day following the reference date, the charging of the battery 40, the discharge of remaining power, and power conservation are switched according to the "actual weather."

[0139] If the weather is sunny the day after the reference date, the electricity generated by the solar power generation device 30 will be used to charge the storage battery 40 as much as possible.

[0140] If the weather forecast for the following day is rain, the battery 40 will be discharged to the load 90 until its remaining power reaches the second standard amount. Discharging will be stopped when the remaining power falls below the second standard amount. The battery 40 will not be charged.

[0141] Here, if the weather forecast for the following day on the reference day is rain, then, as mentioned above, the remaining power in the battery 40 is either conserved or electricity was purchased during the night on the reference day, so the remaining power in the battery 40 can be used during the day on the following day. This makes it possible to suppress the purchase of high grid electricity during the day, even if it rains the next day.

[0142] On the other hand, if the weather forecast for the following day on the reference day is sunny, the remaining power in battery 40 will be low because it has been discharged during the night of the reference day. However, if the weather forecast is wrong and it rains, it will be necessary to purchase electricity during the day when the daytime power consumption is high. In this case, battery 40 will not be charged during the day, and only the power to discharge to load 90 will be purchased. This will minimize the amount of electricity purchased during the day.

[0143] Furthermore, in the charge / discharge control device and program according to the embodiment of the present invention, the fourth control shown in Figure 5(B) is performed when the electric vehicle 110A is connected to the vehicle charge / discharge equipment 60 during the daytime on the day following the reference date.

[0144] If the weather on the day following the reference date is sunny, regardless of the weather forecast for the following day on the reference date, the electricity generated by the solar power generation device 30 will be used to charge the battery 112A of the electric vehicle 110A, and then to charge the battery 40. By prioritizing the charging of battery 112A, it is possible to respond to situations where there is a sudden need to use the electric vehicle 110A.

[0145] If the weather forecast for the following day is rain, the electric vehicle (110A) will discharge to a load of 90 until its remaining power reaches the fourth standard amount. Discharging will stop once the remaining power falls below the fourth standard amount. The electric vehicle and battery will not be charged.

[0146] Here, if the weather forecast for the following day on the reference day is rain, then, as mentioned above, the remaining power in the 112A battery is either preserved or electricity is purchased during the night on the reference day. Also, if the electric vehicle 110A was scheduled to be used but the plans changed, it is charged during the night on the reference day. Therefore, the remaining power in the 112A battery can be used during the day on the following day. This helps to reduce the need to purchase high grid electricity during the day, even if it rains the next day.

[0147] On the other hand, if the weather forecast for the following day on the reference day is sunny and there are no plans to use the electric vehicle 110A, then the remaining power in batteries 112A and 40 will be discharged during the night of the reference day, resulting in low remaining power in batteries 112A and 40. However, if the weather forecast is wrong and it rains, it will be necessary to purchase electricity during the day when the daytime power consumption is high. In this case, batteries 112A and 40 will not be charged during the day, and only the power to discharge to load 90 will be purchased. This will reduce the amount of electricity purchased during the day.

[0148] <Other Embodiments> The charge / discharge control device 10 may also include a "price acquisition unit" that acquires the selling price of electricity generated by the solar power generation device 30 and the purchase price of grid power.

[0149] In this case, the control unit 11E sells the electricity generated by the solar power generation device 30 and purchases grid power if the electricity selling price exceeds the electricity purchase price during the day. On the other hand, if the electricity selling price is less than or equal to the electricity purchase price during the day, the first, second, third, and fourth controls described above are implemented.

[0150] When selling electricity generated by the solar power generation system 30, power loss occurs due to the power conversion efficiency of the converter 20. It is preferable for the control unit 11E to calculate the selling price of electricity, taking this power loss into account, and compare it with the buying price of electricity.

[0151] If the charge / discharge control device 10 is equipped with a unit price acquisition unit, the first to fourth control operations are performed when the unit price for selling electricity generated by the solar power generation device 30 is less than or equal to the unit price for purchasing electricity during the day, i.e., when the unit price for selling electricity is low.

[0152] In the first control system, if the weather forecast for the next day is sunny, the remaining power of battery 40 is discharged to load 90 during the night of the reference day. In the second control system, if the weather forecast for the next day is sunny, the remaining power of battery 40 and battery 112A of the electric vehicle 110A is discharged to load 90 during the night of the reference day.

[0153] In the third control, if the weather forecast for the following day is rain, the remaining power of battery 40 is discharged to the building load during the daytime on the following day. In the fourth control, if the weather forecast for the following day is rain, the remaining power of both battery 40 and battery 112A is discharged to the building load during the daytime on the following day.

[0154] Thus, when the electricity selling price is low, the electricity generated by the solar power generation system 30 and charged into the storage battery 40 and storage battery 112A is consumed by the load 90. It is also consumed when the electric vehicle 110A is running. This makes it possible to reduce the amount of electricity purchased from the relatively expensive grid.

[0155] On the other hand, if the selling price of electricity generated by the solar power generation system 30 exceeds the daytime purchase price, i.e., if the selling price is high, the electricity generated by the solar power generation system 30 is sold and grid power is purchased. This allows for a profit to be made.

[0156] In the above embodiment, for example, the hardware structure of the processing unit that executes the processes of the weather forecast acquisition unit 11A, the schedule acquisition unit 11B, the weather acquisition unit 11C, the vehicle detection unit 11D, and the control unit 11E can be any of the following types of processors. As mentioned above, these types of processors include a CPU, which is a general-purpose processor that executes software (programs) and functions as a processing unit, as well as a programmable logic device (PLD), such as an FPGA (Field-Programmable Gate Array), which is a processor whose circuit configuration can be changed after manufacturing, and a dedicated electrical circuit, such as an ASIC (Application Specific Integrated Circuit), which is a processor with a circuit configuration specifically designed to execute a particular process.

[0157] The processing unit may consist of one of these various processors, or it may consist of a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs, or a combination of a CPU and an FPGA). Alternatively, the processing unit may consist of a single processor.

[0158] Examples of configuring a processing unit with a single processor include, firstly, a configuration where one or more CPUs and software combine to form a single processor, as is common in client and server computers, and this processor functions as the processing unit. Secondly, a configuration using a processor that realizes the functions of the entire system, including the processing unit, on a single IC (Integrated Circuit) chip, as is common in System-on-a-Chip (SoC) systems. Thus, the processing unit is configured, in terms of hardware structure, using one or more of the above-mentioned types of processors.

[0159] Furthermore, the hardware structure of these various processors can more specifically utilize an electrical circuit (circuitry) that combines circuit elements such as semiconductor elements. Thus, the present invention can be implemented in various forms. [Explanation of symbols]

[0160] 10 Control device (charge / discharge control device) 11A Weather Forecast Acquisition Unit 11B Schedule Acquisition Section 11D Control Unit 13A Charge / Discharge Control Program (Program) 30 Solar power generation equipment 40 Storage batteries 60 Charging and discharging equipment 100 buildings 110A Electric Vehicle 112A Battery (for electric vehicles)

Claims

1. A charge / discharge control device for a building equipped with a solar power generation system, storage batteries, electric vehicles, and vehicle charging / discharging equipment, A weather forecast acquisition unit that acquires weather forecasts for the area where the aforementioned building is located, It comprises a control unit that performs first control during the night on the reference day, The first control described above is Regardless of the weather forecast for the day following the reference date, the electric vehicle will be charged, If the weather forecast for the day following the aforementioned reference date is sunny, the remaining power in the battery is discharged to the building's loads; however, if there is no remaining power, the purchased grid power is discharged to the building's loads. If the weather forecast for the day following the aforementioned reference date is rain, and the remaining power of the storage battery is greater than a predetermined first reference amount, the remaining power of the storage battery is discharged to the building load until it reaches the first reference amount. On the other hand, if the remaining power is less than the first reference amount, the purchased grid power is charged to the storage battery and discharged to the building load until it reaches the first reference amount, thereby preserving the first reference amount. Charge / discharge control device.

2. The system includes a schedule acquisition unit that acquires the usage schedule for the aforementioned electric vehicle, The control unit, If there is a planned use of the electric vehicle on the day following the aforementioned reference date, the first control is executed. If there are no plans to use the electric vehicle on the day following the aforementioned reference date, the second control will be executed during the night of the aforementioned reference date. The second control is, If the weather forecast for the day following the aforementioned reference date is sunny, the remaining power of the storage battery is discharged to the building's load, and then the remaining power of the electric vehicle is discharged to the building's load. If there is no remaining power, the purchased grid power is discharged to the building's load. If the weather forecast for the day following the aforementioned reference date is rain, and the remaining power of the storage battery is greater than a predetermined second reference amount, the remaining power of the storage battery is discharged to the building load until it reaches the second reference amount. If the remaining power is less than the second reference amount, the purchased grid power is charged to the storage battery and the purchased grid power is discharged to the building load until it reaches the second reference amount, thereby preserving the second reference amount. Furthermore, if the remaining power of the electric vehicle is greater than a predetermined third reference amount, the remaining power of the electric vehicle is discharged to the building load until it reaches the third reference amount. If the remaining power is less than the third reference amount, the purchased grid power is charged to the electric vehicle and the purchased grid power is discharged to the building load until it reaches the third reference amount, thereby preserving the third reference amount. The charge / discharge control device according to claim 1.

3. The control unit, If the electric vehicle is out during the daytime on the day following the reference date, the third control will be implemented. The third control is, If the weather is sunny, the electricity generated by the solar power system is discharged to the building's internal loads and simultaneously charged into the battery. If it is raining, and the remaining power of the battery is greater than the second reference amount, the remaining power of the battery will be discharged to the building's load until it reaches the second reference amount. However, if the remaining power is less than or equal to the second reference amount, the battery will not be charged, thereby preserving the second reference amount. The charge / discharge control device according to claim 2.

4. The control unit, If the electric vehicle is connected to the vehicle charging / discharging equipment during the daytime on the day following the reference date, the fourth control is performed. The fourth control is, If the weather is sunny, the electricity generated by the solar power system is discharged to the building's internal loads, used to charge electric vehicles, and then used to charge the storage battery. If it is raining, and the remaining power of the storage battery is greater than the second reference amount, the remaining power of the storage battery will be discharged to the building load until it reaches the second reference amount. However, if the remaining power is less than or equal to the second reference amount, the storage battery will not be charged. Furthermore, if the remaining power of the electric vehicle is greater than a predetermined fourth reference amount, the remaining power of the electric vehicle will be discharged to the building load until it reaches the fourth reference amount. However, if the remaining power is less than the fourth reference amount, the electric vehicle will not be charged. The charge / discharge control device according to claim 3.

5. It includes a unit price acquisition unit that acquires the unit price for selling electricity generated by a solar power generation system and the unit price for purchasing grid electricity. The control unit, If the electricity selling price exceeds the electricity buying price during the day, the electricity generated by the solar power generation device is sold and grid electricity is purchased. The charge / discharge control device according to claim 4, wherein the first control, the second control, the third control, and the fourth control are performed when the electricity selling price is less than or equal to the electricity buying price during the daytime.

6. A program for a charge / discharge control device in a building equipped with a solar power generation system, storage batteries, electric vehicles, and vehicle charging / discharging equipment, Computers, A weather forecast acquisition unit that acquires weather forecasts for the area where the aforementioned building is located, A control unit that performs the first control during the night on the reference day, and make it work The first control described above is Regardless of the weather forecast for the day following the reference date, the electric vehicle will be charged, If the weather forecast for the day following the aforementioned reference date is sunny, the remaining power in the battery is discharged to the building's loads; however, if there is no remaining power, the purchased grid power is discharged to the building's loads. If the weather forecast for the day following the aforementioned reference date is rain, and the remaining power of the storage battery is greater than a predetermined first reference amount, the remaining power of the storage battery is discharged to the building load until it reaches the first reference amount. On the other hand, if the remaining power is less than the first reference amount, the purchased grid power is charged to the storage battery and discharged to the building load until it reaches the first reference amount, thereby preserving the first reference amount. program.

7. In a building equipped with solar power generation equipment, storage batteries, electric vehicles, and vehicle charging / discharging equipment, Obtain the weather forecast for the area where the aforementioned building is located, The first control is performed during the night on the reference day. The first control described above is Regardless of the weather forecast for the day following the reference date, the electric vehicle will be charged, If the weather forecast for the day following the aforementioned reference date is sunny, the remaining power in the battery is discharged to the building's loads; however, if there is no remaining power, the purchased grid power is discharged to the building's loads. If the weather forecast for the day following the aforementioned reference date is rain, and the remaining power of the storage battery is greater than a predetermined first reference amount, the remaining power of the storage battery is discharged to the building load until it reaches the first reference amount. On the other hand, if the remaining power is less than the first reference amount, the purchased grid power is charged to the storage battery and discharged to the building load until it reaches the first reference amount, thereby preserving the first reference amount. Charge / discharge control method.

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