Power System

Abstract

To provide a power system that sufficiently reduces a loss of power generated by a photovoltaic power generation device mounted on a vehicle.SOLUTION: A power system 1 controls supply of power between a vehicle 10 and a facility 20 outside the vehicle. The vehicle comprises a photovoltaic power generation device 11 and a power storage device 12. The power system is configured to: perform measurement of a current power generation amount (first power generation amount) and prediction of a future power generation amount (second power generation amount) of the photovoltaic power generation device; on the basis of the first power generation amount and the second power generation amount, supply power to a first power consumption target of the vehicle at a higher priority than a second power consumption target in the facility; predict surplus power after the power supply; and determine whether to store the surplus power into the power storage device or to supply the surplus power to the first power consumption target and the second power consumption target in the future.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to power systems. [Background technology]

[0002] Patent Document 1 discloses a power grid system in which a storage battery on a vehicle side and a storage battery on a residential side exchange electric power with each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-156569 Summary of the Invention [Problem to be solved by the invention]

[0004] The amount of electricity that can be generated by solar power generation equipment installed in vehicles (hereinafter referred to as "on-board PV (Photovoltaic)") is increasing day by day as solar power generation equipment is developed. In addition, when on-board PV can secure enough electricity to run the vehicle, technology to utilize surplus electricity is also being developed.

[0005] Patent Document 1 discloses a power grid system in which a vehicle's storage battery and a residential storage battery share power. However, this system of sharing power between the vehicle and the residential side results in a large loss of power, so a system with less loss is needed.

[0006] The present disclosure has been made to solve such problems, and aims to provide a power system that sufficiently reduces the loss of power generated by an on-board PV. [Means for solving the problem]

[0007] The present disclosure provides a power system that controls the supply of power between a vehicle and equipment external to the vehicle, the vehicle including a photovoltaic power generation device and a power storage device. The power system measures the current power generation amount (first power generation amount) of the photovoltaic power generation device and predicts a future power generation amount (second power generation amount), supplies power to a first power consumer in the vehicle prior to a second power consumer in the equipment based on the first power generation amount and the second power generation amount, predicts surplus power after the power supply, and determines whether to store the surplus power in the power storage device or supply the surplus power to the first power consumer and the second power consumer first. This makes it possible to provide a power system that sufficiently reduces loss of power generated by an on-board PV. [Effects of the Invention]

[0008] The present disclosure makes it possible to provide a power system that sufficiently reduces the loss of power generated by an on-board PV. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram of a power system according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram illustrating control of the power system according to the present embodiment. [Figure 3] 3 is a flowchart of control of the power system according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 shows a power system according to the present embodiment.

[0011] The power system 1 shown in Fig. 1 controls the supply of power to a vehicle 10 and an external facility 20 of the vehicle. The vehicle 10 is equipped with a solar power generation device 11 and a power storage device 12. An example of the external facility 20 of the vehicle 10 is the residence of a vehicle user. Hereinafter, a solar power generation device mounted on a vehicle may be referred to as an "on-vehicle PV (Photovoltaic)."

[0012] Power system 1 according to the present embodiment is used in a state in which a power consumer (first power consumer) in vehicle 10 and a power consumer (second power consumer) in facility 20 are each connected to power storage device 12.

[0013] In the example shown in this embodiment, the first power consumption objects include an air conditioning unit and a surveillance camera installed in the vehicle 10, and the second power consumption objects include an anti-freeze unit, a ventilation system, an electric water heater, etc.

[0014] Next, the control of the power system 1 according to this embodiment will be described with reference to Fig. 2. Fig. 2(a) shows the daily changes in the amount of power generated by the solar power generation device 11 (first power 100), the amount of power consumed by the air conditioning unit (first power consumption 101), and the amount of power consumed by the surveillance camera (second power consumption 102). Fig. 2(b) shows the daily changes in the amount of power consumed by the antifreeze unit (third power consumption 203), the amount of power consumed by the ventilation system (fourth power consumption 204), and the amount of power consumed by the electric water heater (fifth power consumption 205), which will be described later.

[0015] The amount of power generated by the solar power generation device 11 (first power 100) increases during the day as the amount of solar radiation increases, and since no power is generated after sunset, it changes as shown by the curve in FIG. 2(a).

[0016] The power system 1 according to this embodiment measures the current amount of power generated (first amount of power generated) by the solar power generation device 11 and predicts the future amount of power generated (second amount of power generated). For example, at time t in FIG. 2(a), the power system 1 measures the amount of power generated by the solar power generation device 11 to be as shown by the solid line portion of the first power 100. Thereafter, based on information such as the weather of that day, the power system 1 predicts that the solar power generation device 11 will generate power as shown by the dotted line portion of the first power 100 after time t.

[0017] In this way, the power system 1 obtains information on the amount of power (first power 100) generated by the solar power generation device 11, thereby enabling the power supply control described below.

[0018] The first power consumption 101 by the air conditioning unit equipped in the vehicle 10 is used for pre-air conditioning, and is therefore the power consumed when the user uses the vehicle 10. On the other hand, since the surveillance camera constantly monitors the vehicle 10, the second power consumption 102 by the surveillance camera remains constant.

[0019] The third power consumption 203 by the antifreeze unit provided in the facility 20 is used, for example, in winter to control the freezing prevention of windows, water pipes, etc., and is therefore power consumed from night to early morning. The fourth power consumption 204 by the ventilation system remains constant when the facility 20 is constantly ventilated. The fifth power consumption 205 by the electric water heater is power consumed at night, for example, to provide bath water.

[0020] The power system 1 according to this embodiment performs control to supply the first power 100 generated by the on-board PV with priority to the first power consumption object provided in the vehicle 10 after ensuring the power necessary for the vehicle 10 to travel.

[0021] 2(b) is the amount of power obtained by subtracting the power supplied to the vehicle 10 from the first power 100. The power system 1 sets the amount of power to be supplied to the facility 20 based on the measured first power generation amount, the predicted second power generation amount, and information on the second power 110, and supplies power to the facility 20.

[0022] Furthermore, if the second power 110 is expected to be greater than the power required for the second power consumption object in the facility 20, surplus power will be generated after the power supply. In this case, the power system 1 determines whether to store this surplus power in the power storage device 12 provided in the vehicle 10, or to supply power in advance to the future first power consumption object and second power consumption object.

[0023] In the example shown in FIG. 2(b), the advanced supply of power is performed by supplying advanced power 206 to fifth consumed power 205 used in an electric water heater.

[0024] The above determination made by the power system 1 is made by comparing a case where the power supply provided in the facility 20 supplies power to the second power consumer with power, and a case where the surplus power is used to advance the advance power 206, and selecting the case where the loss is smaller. If the loss is smaller in the former case, the power system 1 controls so that the surplus power is stored in the power storage device 12. On the other hand, if the loss is smaller in the latter case, the power system 1 controls so that the surplus power is used to advance the advance power 206.

[0025] In this way, the power system 1 performs control to ensure that the power necessary for the vehicle 10 to run is secured, and then surplus power is supplied to the equipment 20, and the surplus power can be utilized, thereby minimizing power loss.

[0026] Control of the power system 1 according to this embodiment will be described with reference to Fig. 3. The flowchart shown in Fig. 3 represents control performed by the power system 1 after measuring the current power generation amount (first power generation amount) of the solar power generation device 11 and predicting the future power generation amount (second power generation amount). In the following description, the power generation amount of the solar power generation device 11 (on-board PV) takes into account the first power generation amount and the second power generation amount.

[0027] First, the power system 1 predicts the power consumption of a first power consumer in the vehicle 10 and a second power consumer in the equipment 20. For the predicted power consumption, a comparison is made between the loss when power is supplied from the on-board PV and the loss when power is supplied from the power sources provided in the power storage device 12 of the vehicle 10 and the equipment 20 (S101). If the loss is greater when power is supplied from the on-board PV, power is not supplied to the vehicle 10 and the equipment 20, and the power generated by the on-board PV is controlled to be stored in the power storage device 12, and the process ends (S102).

[0028] If supplying power from the on-board PV results in smaller losses, surplus power will be generated after power is supplied. Therefore, a comparison is made between the losses when the surplus power is used for forward output and the losses when it is used for storage (S103). If forward supply results in smaller losses, the power generated by the on-board PV is supplied to the vehicle 10 and the equipment 20, and the surplus power is further forward output (S104). On the other hand, if storing the power results in smaller losses, the power generated by the on-board PV is supplied to the vehicle 10 and the equipment 20, and the surplus power is further stored (S105).

[0029] In this way, it is possible to provide a power system that sufficiently reduces the loss of power generated by the on-board PV.

[0030] The present disclosure is not limited to the above-described embodiments and can be modified as appropriate without departing from the spirit of the present disclosure. The present disclosure also contributes to carbon neutrality, decarbonization, and the Sustainable Development Goals (SDGs). [Explanation of symbols]

[0031] 1. Power System 10 vehicles 11. Solar power generation equipment 12. Energy storage device 20 Equipment 100 First Electric Power 110 Second Electric Power 101 1st power consumption 102 2nd power consumption 203 3rd power consumption 204 4th power consumption 205 5th power consumption 206 Advance Power

Claims

[Claim 1] An electric power system that controls a supply of electric power between a vehicle and equipment outside the vehicle, the vehicle is equipped with a solar power generation device and a power storage device, The power system includes: measuring a current power generation amount (first power generation amount) of the solar power generation device and predicting a future power generation amount (second power generation amount); supplying power to a first power consumer in the vehicle with priority over a second power consumer in the facility with respect to the first power generation amount and the second power generation amount; predicting power consumption after power is supplied to the first power consumption object and the second power consumption object; comparing the predicted power consumption with a power loss when the power is supplied from the solar power generation device provided in the vehicle and when the power is supplied from the power storage device provided in the vehicle and a power source provided in the facility; If the loss of the power is smaller when the power is supplied from the solar power generation device, the power loss when the surplus power generated after the power is supplied is used in advance is compared with the power loss when the surplus power is used for power storage, and a determination is made as to whether the surplus power should be stored in the power storage device or whether it should be supplied in advance to the first power consumption target and the second power consumption target in the future. Power system.

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