Power supply system

Abstract

This provides a power supply system that can appropriately distribute power supplied from a vehicle to loads with different corresponding voltages. [Solution] The power supply system 100 includes switches 12 and 22 that can switch the electrical connection and disconnection between the overcurrent breakers 4 and 6 and the power converter 13, respectively, and a controller 400 that switches the switches 12 and 22 on and off. Switch 12 switches the electrical connection and disconnection between the load 7 corresponding to 100V and the power converter 13. Switch 22 switches the electrical connection and disconnection between the load 8 corresponding to 200V and the power converter 13. When supplying power from the vehicle 300 to the loads 7 and 8, the controller 400 switches the switches 12 and 22 on and off based on the power supply capacity of the vehicle 300 and the power demand of the load 7 and the power demand of the load 8.

Description

Technical Field

[0001] The present disclosure relates to a power supply system.

Background Art

[0002] In a power supply system capable of supplying power from a system power source to a power load in a house, power from a vehicle can mainly be supplied to the power load in an emergency (such as when the system power source fails or when the power of the system power source is in short supply). In addition to this, it has also been proposed to supply power from a vehicle to a power load in daily life (such as during a time period when the electricity bill of the system power source is high). Japanese Patent Application Laid-Open No. 2019-71721 (Patent Document 1) discloses a power supply system that can utilize the power stored in an electric vehicle during a power outage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although not specified in the above Patent Document 1, the power load may include a first load operated by a first voltage and a second load operated by a second voltage. In this case, it is desirable to appropriately distribute the power supplied from the vehicle to the first load and the second load.

[0005] The present disclosure has been made to solve the above problems, and one of the objects of the present disclosure is to provide a power supply system capable of appropriately distributing the power supplied from a vehicle to loads having different corresponding voltages.

Means for Solving the Problems

[0006] A power supply system according to one aspect of the present disclosure is a power supply system that supplies alternating current power from a grid power source to a power load of a house, comprising: a current circuit breaker that receives alternating current power from the grid power source to the house and interrupts the power in the event of leakage and overcurrent; a load circuit breaker configured to electrically interrupt the power between the current circuit breaker and the power load; a power converter configured to supply alternating current power from a vehicle to the power load when a vehicle is connected; a switch configured to switch between electrical connection and interruption between the load circuit breaker and the power converter; and a switching device for switching the switch on and off. The power load includes a first load that operates on a first voltage and a second load that operates on a second voltage different from the first voltage. The switch includes a first switch configured to switch between electrical connection and interruption between the first load and the power converter, and a second switch configured to switch between electrical connection and interruption between the second load and the power converter. The switching device switches the first and second switches on and off based on the vehicle's power supply capacity and the power demand of the first and second loads when supplying power from the vehicle to the power load. [Effects of the Invention]

[0007] According to this disclosure, power supplied from a vehicle can be appropriately distributed to loads with different corresponding voltages. [Brief explanation of the drawing]

[0008] [Figure 1] This is a circuit block diagram showing the configuration of a power supply system according to one embodiment. [Figure 2] This is a flowchart showing a first example of processing by a controller in a power supply system according to one embodiment. [Figure 3] This flowchart shows a second example of processing by a controller in a power supply system according to one embodiment. [Figure 4] This is a circuit block diagram showing the configuration of a power supply system according to a modified embodiment. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0010] <System Configuration> Figure 1 is a circuit block diagram showing the configuration of the power supply system 100 according to this embodiment. The power supply system 100 comprises a house 110, a grid power supply 200, and a vehicle 300. In this embodiment, the grid power supply 200 is capable of transmitting AC 100V and AC 200V. The vehicle 300 has an output voltage of 200V when powered. Therefore, the power converter 13 (described later) connected to the vehicle 300 outputs AC 200V. Note that 100V and 200V are examples of the "first voltage" and "second voltage" as described herein.

[0011] The power supply system 100 supplies power from the grid power source 200 to the loads of the house 110. The house 110 is typically a residence (a building where people live). However, the house 110 may also include buildings that are not for residential use, such as office buildings or buildings housing equipment. The loads are, for example, various electrical appliances, which may be located inside (indoors) or outside (outdoors) the house 110.

[0012] The power supply system 100 includes an energy meter 1, a main breaker 2, a ground fault circuit interrupter 3, overcurrent breakers 4, 5, and 6, loads 7 and 8, a transformer 9, a charging switch 10, switches 11, 12, 21, and 22, a power converter 13, a resistive element 14, and a controller 400. The number of overcurrent breakers is not particularly limited. Switches 12 and 22 are examples of the “switch” in this disclosure. Switches 12 and 22 are examples of the “first switch” and “second switch” in this disclosure, respectively. The controller 400 is an example of the “switching device” in this disclosure. Loads 7 and 8 are examples of the “power load” in this disclosure. Loads 7 and 8 are examples of the “first load” and “second load” in this disclosure, respectively. Furthermore, overcurrent breaker 4 and overcurrent breaker 5 are examples of “load circuit breakers” in this disclosure. Also, transformer 9 is an example of “voltage transformer” in this disclosure.

[0013] The electricity meter 1 receives AC power from the grid power supply 200 to the house 110. The main breaker 2 interrupts the circuit when it detects an abnormality (overcurrent) in the current capacity flowing from the grid power supply 200. The earth leakage circuit breaker 3 interrupts the circuit when it detects an earth leakage. The electricity meter 1, the main breaker 2, and the earth leakage circuit breaker 3 constitute the current circuit breaker 120.

[0014] The current circuit breaker 120 is connected to a circuit PL1 for transmitting AC100V alternating current power and a circuit PL2 for transmitting AC200V alternating current power.

[0015] The overcurrent breaker 4 is electrically connected to the AC100V circuit PL1. Although not shown, the house 110 includes multiple rooms. Each of the multiple rooms is equipped with a 100V load 7. Each of the multiple rooms is also equipped with an overcurrent breaker 4. The overcurrent breaker 4 is configured to electrically interrupt the connection between the current circuit breaker 120 and the load 7 when an overcurrent is detected. The overcurrent breaker 4 corresponds to the "load circuit breaker" in this disclosure. The load 7 corresponds to the "power load" in this disclosure.

[0016] The overcurrent breaker 5 is electrically connected to the electric circuit PL2 for AC 200V. The overcurrent breaker 5 is provided in each of a plurality of rooms in the house 110, similarly to the overcurrent breaker 4 for AC 100V. The overcurrent breaker 5 is configured to electrically cut off between the current breaker 120 and the load 8 for 200V when overcurrent is detected. In FIG. 1, for simplicity, only one load 8 (overcurrent breaker 5) is shown.

[0017] The power conversion device 13 is configured to be connected to the vehicle 300 via a power supply cable not shown. The vehicle 300 is an electric vehicle equipped with a traveling battery and capable of power transfer with the outside of the vehicle, specifically, a BEV (Battery Electric Vehicle) or a PHEV (Plug-in Hybrid Electric Vehicle). The power conversion device 13 includes an AC / DC conversion device and is configured to supply AC power from the vehicle 300 to the loads 7 and 8 when the vehicle 300 is connected.

[0018] The first end of the switch 11 is electrically connected to the current breaker 120. The second end of the switch 11 is electrically connected to the overcurrent breaker 4. Thereby, the switch 11 is configured to switch between electrical connection and disconnection between the current breaker 120 and the overcurrent breaker 4 (load 7) according to a control command from the controller 400.

[0019] The first end of the switch 21 is electrically connected to the current breaker 120. The second end of the switch 21 is electrically connected to the overcurrent breaker 5. Thereby, the switch 21 is configured to switch between electrical connection and disconnection between the current breaker 120 and the overcurrent breaker 5 (load 8) according to a control command from the controller 400.

[0020] Transformer 9 is disposed in the current path 9a between the power conversion device 13 and the switch 12. The first end of the switch 12 is electrically connected to the first end of the transformer 9. The second end of the transformer 9 is electrically connected to the power conversion device 13. The second end of the switch 12 is electrically connected to the overcurrent breaker 4. Thereby, the switch 12 is configured to switch the electrical connection and disconnection between the transformer 9 (power conversion device 13) and the overcurrent breaker 4 (load 7) according to a control command from the controller 400. Note that the transformer 9 transforms the AC 200V alternating current power transmitted from the power conversion device 13 into AC 100V alternating current power.

[0021] Thereby, at the time of power supply from the vehicle 300, the output voltage of the vehicle 300 can be adjusted to the voltage (100V) corresponding to the load 7 by the transformer 9. As a result, power can be easily supplied from the vehicle 300 to the load 7.

[0022] Note that generally, large household appliances such as water heaters and air conditioners are included in the load 8 (200V load), so the power demand (power consumption) is often smaller for the load 7 (100V load) than for the load 8. Therefore, by disposing the transformer 9 on the current path 9a between the switch 12 on the load 7 side where the power demand is relatively small and the power conversion device 13, it is possible to make the capacity of the transformer 9 relatively small.

[0023] The first end of the switch 22 is electrically connected to the power conversion device 13. The second end of the switch 22 is electrically connected to the overcurrent breaker 5. Thereby, the switch 22 is configured to switch the electrical connection and disconnection between the power conversion device 13 and the overcurrent breaker 5 (load 8) according to a control command from the controller 400.

[0024] The resistance element 14 is a high-resistance element. The resistance element 14 is electrically connected to the circuit connecting the switch 22 and the power conversion device 13.

[0025] The first terminal of the charging switch 10 is electrically connected to the power converter 13. The second terminal of the charging switch 10 is electrically connected to the first terminal of the overcurrent breaker 6. The second terminal of the overcurrent breaker 6 is electrically connected to the second terminal of the switch 21. This makes it possible to charge the vehicle 300 with power supplied from the grid power supply 200 through the charging switch 10.

[0026] Although not shown in the diagram, the current circuit breaker 120 and the overcurrent breakers 4, 5, and 6 are installed in the distribution board (which may be a switchboard depending on the type of house 110). If the distribution board is large, the switches 11, 12, 21, 22 and the charging switch 10 may be located inside the distribution board. If the distribution board is small, the switches 11, 12, 21, 22 and the charging switch 10 may be mounted externally to the distribution board and located in an enclosure near the distribution board.

[0027] The controller 400 is a computer device including a processor 401 and memory 402, and is, for example, a HEMS (Home Energy Management System) controller. The controller 400 outputs control commands to open and close (switch on / off) each of the switches 11, 12, 21, 22 and the charging switch 10. As will be described later, the controller 400 may also be able to acquire power information (power trading information, electricity rate information, etc.) of the grid power supply 200 from an energy management server (not shown) and open and close the switches 11, 12, 21, 22 or control the power converter 13 (i.e., supply power from the vehicle 300) according to the acquired power information.

[0028] There is a phase difference between the AC power supplied from the grid power supply 200 and the AC power supplied from the vehicle 300. Therefore, it is not desirable to supply AC power from the grid power supply 200 and AC power from the vehicle 300 to loads 7 and 8 simultaneously. Which of the two AC power sources to supply to loads 7 and 8 can be selected using switches 11, 21 and switches 12, 22. Specifically, by turning on switches 11 and 21, loads 7 and 8 can be powered using power from the grid power supply 200, and by turning on switches 12 and 22, loads 7 and 8 can be powered using power from the vehicle 300.

[0029] When supplying power using grid power supply 200, power can be supplied to load 7 by turning on switch 11, and power can be supplied to load 8 by turning on switch 21.

[0030] When supplying power using the power of vehicle 300, power can be supplied to load 7 by turning on switch 12, and power can be supplied to load 8 by turning on switch 22.

[0031] In this case, when supplying power to each load using the power from vehicle 300, it is desirable to appropriately distribute the power supplied from the vehicle to each load.

[0032] Therefore, in this embodiment, when the controller 400 supplies power from the vehicle 300 to loads 7 and 8, it performs a switching process to switch the switches 12 and 22 on and off based on the power supply capacity of the vehicle 300 and the power demand of load 7 and load 8. The details will be explained according to the following flowchart.

[0033] <Processing Flow> Figure 2 is a flowchart showing a first example of the processing procedure for controlling switches 11, 12, 21, and 22. The processing shown in this flowchart is executed when predetermined conditions are met (for example, at predetermined intervals). Each step is implemented by software processing by the controller 400 (processor 401), but may also be implemented by hardware (electrical circuits) located within the controller 400. Hereinafter, steps will be abbreviated as S. The same applies to other flowcharts described later.

[0034] Here, we will explain using the power supply system 100 shown in Figure 1 as an example. At the start of the series of processes, we assume that switches 11 and 12 are ON (closed), and switches 12 and 22 are OFF (open).

[0035] Referring to Figures 1 and 2, in S1, the controller 400 determines whether the power converter 13 is connected to the vehicle 300. If the power converter 13 is connected to the vehicle 300 (YES in S1), the controller 400 proceeds to S2. If the power converter 13 is not connected to the vehicle 300 (NO in S1), the controller 400 terminates the process. Note that the process in S1 may be omitted.

[0036] In S2, the controller 400 obtains power information for the grid power supply 200 (current electricity bill information in this example) from, for example, an energy management server (not shown).

[0037] In S3, the controller 400 determines whether the current electricity rate obtained in S2 is higher than the benchmark price (for example, the average price of electricity for that day). If the current electricity rate is higher than the benchmark price (YES in S3), the controller 400 proceeds to S4. If the current electricity rate is less than or equal to the benchmark price (NO in S3), the controller 400 proceeds to S15. The benchmark price is an example of a "predetermined threshold" in this disclosure.

[0038] In S4, the controller 400 obtains the charge state (SOC: State of Charge) of the battery installed in the vehicle 300 through communication with the vehicle 300 or other means. The controller 400 then determines whether the SOC obtained in S4 is higher than the required value (S5). The required value is, for example, a value corresponding to the amount of power required for the vehicle 300 to run the following day. The required value may be a predetermined fixed value or a variable value determined according to the usage history of the vehicle 300.

[0039] If the SOC is higher than the required value (YES in S5), the controller 400 proceeds to S6. If the SOC is less than or equal to the required value (NO in S5), the controller 400 proceeds to S13.

[0040] In S6, the controller 400 determines whether the sum of the power consumption of loads 7 and 8 is less than the power that can be supplied from the vehicle 300 (the upper limit of the power supplied / hereinafter referred to as the power supply capacity). The power consumption of loads 7 (8) means the power required to supply power to loads 7 (8) (demand power). If the above sum is less than the power supply capacity of the vehicle 300 (YES in S6), the controller 400 proceeds to S7. If the above sum is equal to or greater than the power supply capacity of the vehicle 300 (NO in S6), the controller 400 proceeds to S8.

[0041] For example, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 3kW, and load 8 consumes 2kW, the controller 400 proceeds to process S7. Alternatively, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 3kW, and load 8 consumes 4kW, the controller 400 proceeds to process S8.

[0042] In S7, the controller 400 turns off switches 11 and 21 and turns on switches 12 and 22. This stops the power supply from the grid power supply 200 to loads 7 and 8, and allows power to be supplied from the vehicle 300 to loads 7 and 8. As a result, the power supplied from the vehicle 300 can meet the power demands of loads 7 and 8. Next, the controller 400 proceeds to process S12.

[0043] In S8, the controller 400 determines whether the power consumption of each of loads 7 and 8 is less than the power supply capacity of the vehicle 300. If the power consumption of each of loads 7 and 8 is less than the power supply capacity of the vehicle 300 (YES in S8), the controller 400 proceeds to S9. If the power consumption of at least one of loads 7 and 8 is equal to or greater than the power supply capacity of the vehicle 300 (NO in S8), the controller 400 proceeds to S10.

[0044] For example, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 3kW, and load 8 consumes 4kW, the controller 400 proceeds to process S9. Also, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 3kW, and load 8 consumes 7kW, the controller 400 proceeds to process S10. Also, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 7kW, and load 8 consumes 7kW, the controller 400 proceeds to process S10.

[0045] In S9, the controller 400 turns on one of the switches 12 and 22 that corresponds to the load with the higher power consumption, and turns off the other. For example, if the power supply capacity of vehicle 300 is 6kW, the power consumption of load 7 is 3kW, and the power consumption of load 8 is 4kW, then the controller 400 turns on the switch 22 that corresponds to load 8, and turns off the switch 12 that corresponds to load 7. Therefore, only the load with the higher power consumption of loads 7 and 8 is supplied with power from vehicle 300.

[0046] This allows the vehicle 300 to supply power to the load with the higher power consumption between load 7 and load 8, especially when electricity rates are relatively high. As a result, the amount of power supplied from the grid power source 200, which incurs electricity charges, can be effectively reduced, thus easily lowering electricity costs. If the power consumption of load 7 and load 8 are equal, only one of the switches 12 and 22, randomly selected, may be turned on.

[0047] Furthermore, in this case, the load with lower power consumption may be powered from the grid power supply 200. Next, the controller 400 proceeds to process S12.

[0048] In S10, the controller 400 determines whether only one of the power consumption of load 7 or load 8 is less than the power supply capacity of vehicle 300. If only one of the power consumption of load 7 or load 8 is less than the power supply capacity of vehicle 300 (YES in S10), the controller 400 proceeds to S11. If the power consumption of both load 7 and load 8 is greater than or equal to the power supply capacity of vehicle 300 (NO in S10), the controller 400 proceeds to S13.

[0049] For example, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 3kW, and load 8 consumes 7kW, the controller 400 proceeds to process S11. Alternatively, if vehicle 300 has a power supply capacity of 6kW, load 7 consumes 7kW, and load 8 consumes 7kW, the controller 400 proceeds to process S13.

[0050] In S11, the controller 400 turns on the switch 12, 22 that corresponds to a load whose power consumption is less than the power supplied by the vehicle 300, and turns off the other switch. For example, if the power supply capacity of the vehicle 300 is 6kW, the power consumption of load 7 is 3kW, and the power consumption of load 8 is 7kW, the controller 400 turns on switch 12 that corresponds to load 7 and turns off switch 22 that corresponds to load 8. In this case, loads whose power consumption is greater than or equal to the power supply capacity of the vehicle 300 may be supplied from the grid power supply 200. Next, the controller 400 proceeds to process S12.

[0051] Although the above example shows the process of performing S10 after the process of S8, it is also possible to perform the process of S10 before the process of S8.

[0052] In S12, the controller 400 starts controlling the power supply from the vehicle 300 to load 7 and / or load 8. If the power supply control has already started, the controller 400 continues the power supply control. Next, the controller 400 returns to processing in S4.

[0053] In S13, the controller 400 terminates the power supply control from the vehicle 300 to load 7 and / or load 8. Next, the controller 400 proceeds to S14.

[0054] In S14, the controller 400 turns on switches 11 and 21, and turns off switches 12 and 22. After that, the controller 400 terminates the series of processing flows.

[0055] In S15, the controller 400 controls the power supply from the grid power supply 200 to loads 7 and 8 via switches 11 and 12. Next, the controller 400 proceeds to S16.

[0056] In S16, the controller 400 terminates the power supply control from the grid power supply 200 to loads 7 and 8, respectively. After that, the controller 400 terminates the series of processing flows.

[0057] Figure 3 is a flowchart showing a second example of the processing procedure for controlling switches 11, 12, 21, and 22. The processing shown in this flowchart is executed when predetermined conditions are met (for example, at predetermined intervals).

[0058] Here, we will explain using the power supply system 100 shown in Figure 1 as an example. At the start of the series of processes, it is assumed that switches 11 and 12 are ON (closed), and switches 12 and 22 are OFF (open). In this embodiment, the priority of loads that will be powered by the vehicle 300 when the grid power supply 200 fails is predetermined. For example, the priority of load 8 is set higher than the priority of load 7.

[0059] Referring to Figures 1 and 3, in S21, the controller 400 determines whether the power converter 13 is connected to the vehicle 300. If the power converter 13 is connected to the vehicle 300 (YES in S21), the controller 400 proceeds to S22. If the power converter 13 is not connected to the vehicle 300 (NO in S21), the controller 400 terminates the process. Note that the process in S21 may be omitted.

[0060] In S22, the controller 400 obtains power information for the grid power supply 200 (in this example, the power supply status of the grid power supply 200) from, for example, an energy management server (not shown).

[0061] In S23, the controller 400 determines whether the grid power supply 200 is experiencing a power outage based on the information obtained in S22. If the grid power supply 200 is experiencing a power outage (YES in S23), the controller 400 proceeds to S24. If the grid power supply 200 is not experiencing a power outage (NO in S23), the controller 400 proceeds to S32.

[0062] In S24, the controller 400 turns off the switches 11 and 21 corresponding to the grid power supply 200. Next, the controller 400 proceeds to S25.

[0063] In S25, the controller 400 determines whether the sum of the power consumption of loads 7 and 8 immediately before the power outage is less than the power supply capacity of vehicle 300. If the sum immediately before the power outage is less than the power supply capacity of vehicle 300 (YES in S25), the controller 400 proceeds to S26. If the sum is equal to or greater than the power supply capacity of vehicle 300 (NO in S25), the controller 400 proceeds to S27. Note that information on the power consumption of loads 7 and 8 for each time period may be stored in the memory 402 of the controller 400.

[0064] In S26, the controller 400 turns on switches 12 and 22. This enables power to be supplied from the vehicle 300 to loads 7 and 8. Next, the controller 400 proceeds to S31.

[0065] In S27, the controller 400 determines whether the power consumption of the higher-priority load (load 7 or load 8) immediately before the power outage is less than the power supply capacity of the vehicle 300. If the power consumption of the higher-priority load is less than the power supply capacity of the vehicle 300 (YES in S27), the controller 400 proceeds to S28. If the power consumption of the higher-priority load is equal to or greater than the power supply capacity of the vehicle 300 (NO in S27), the controller 400 proceeds to S29.

[0066] In S28, the controller 400 turns on the switch corresponding to the load with higher priority among the switches 12 and 22, and turns off the other switch. For example, if load 8 has a higher priority than load 7, and the power supply capacity of vehicle 300 is 6kW, and the power consumption of load 8 is 3kW, then the controller 400 turns on the switch 22 corresponding to load 8 and turns off the switch 12 corresponding to load 7. Next, the controller 400 proceeds to S31.

[0067] This allows for a more rapid restoration of operation of the higher-priority load (either load 7 or load 8) in the event of a power outage in grid power 200, using power from vehicle 300.

[0068] In S29, the controller 400 determines whether the power consumption of the lower-priority load (load 7 or load 8) immediately before the power outage is less than the power supply capacity of the vehicle 300. If the power consumption of the lower-priority load is less than the power supply capacity of the vehicle 300 (YES in S29), the controller 400 proceeds to S30. If the power consumption of the lower-priority load is equal to or greater than the power supply capacity of the vehicle 300 (NO in S29), the controller 400 proceeds to S32.

[0069] Although the example above shows the processing of S29 after the processing of S27, it is also possible to perform the processing of S29 before the processing of S27.

[0070] In S31, the controller 400 starts power supply control from the vehicle 300 to load 7 and / or load 8. If the above power supply control has already started, the controller 400 continues the above power supply control. Next, the controller 400 returns to processing in S23.

[0071] In S32, the controller 400 terminates the power supply control from the vehicle 300 to load 7 and / or load 8. Next, the controller 400 proceeds to S33.

[0072] In S33, the controller 400 turns on switches 11 and 21, and turns off switches 12 and 22. After that, the controller 400 terminates the series of processing flows.

[0073] As described above, in this embodiment, when the vehicle 300 supplies power to loads 7 and 8, the controller 400 performs a switching process to switch the switches 12 and 22 on and off based on the power supply capacity of the vehicle 300 and the power demands of load 7 and load 8. This allows the power supplied to load 7 and the power supplied to load 8 to be appropriately adjusted based on the power supply capacity of the vehicle 300 and the power demands of load 7 and load 8. Therefore, the power supplied from the vehicle 300 can be appropriately distributed to loads 7 and 8.

[0074] [Differentiation] In the above embodiment, an example was shown in which power is supplied from the vehicle 300 to, for example, load 8, and power is supplied to all the equipment of load 8, but the disclosure is not limited to this. Power may be supplied to only some of the equipment of load 8. Although load 8 was given as an example, power may be supplied to some of the equipment of load 7 instead of / in addition to load 8. Figure 4 illustrates an example in which power is supplied from the vehicle 300 to some of the equipment of load 8. In the example shown in Figure 4, the priority of load 8 may be higher than the priority of load 7.

[0075] The power supply system 101 shown in Figure 4 is equipped with an overcurrent breaker 15. In the example shown in Figure 4, load 8 includes load 8a and load 8b. Load 8b is a load with particularly high priority among load 8. Load 8b may be selected such that the total power consumption of load 8b is less than or equal to the power supply capacity of vehicle 300.

[0076] The first terminal of the overcurrent breaker 15 is electrically connected to the switch 22. The second terminal of the overcurrent breaker 15 is electrically connected to the load 8b. Loads 8a and 8b are each electrically connected to the overcurrent breaker 5.

[0077] In the configuration shown in Figure 4, in each determination shown in Figure 3, the power consumption of load 8b is used as the criterion for determination instead of the power consumption of load 8. This allows for more reliable power supply from vehicle 300 to load 8b, which has a particularly high priority among the relatively high-priority loads 8. Note that in each determination shown in Figure 2, the power consumption of load 8b may be used as the criterion for determination instead of the power consumption of load 8. Also, the priority of load 8 may be lower than the priority of load 7.

[0078] In the above embodiment, an example was shown in which the transformer 9 is electrically connected to the switch 12 on the load 7 side, but the disclosure is not limited thereto. A transformer electrically connected to the switch 22 on the load 8 side may be arranged in place of / in addition to the transformer 9.

[0079] In the above embodiment, an example was shown in which power is supplied from the vehicle 300 to the load based on the priority of the load when the grid power supply 200 is experiencing a power outage, but the disclosure is not limited thereto. Even when the grid power supply 200 is experiencing a power outage, the determinations shown in Figure 2 may be made. Also, even when the grid power supply 200 is not experiencing a power outage, the determinations may be made based on priority in the same manner as the determinations shown in Figure 3.

[0080] In the above embodiment, an example was shown in which the current circuit breaker 120 includes a main breaker 2 and a ground fault circuit breaker 3, but the disclosure is not limited thereto. The current circuit breaker may include only one of the main breaker 2 and the ground fault circuit breaker 3.

[0081] In the embodiments described above, the controller 400 is shown as capable of executing each of the processing flows in Figures 2 and 3, but the disclosure is not limited thereto. The controller may be capable of executing only one of the processing flows in Figures 2 and 3.

[0082] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0083] 4,5 Overcurrent breaker (load breaker), 7 Load (power load) (1st load), 8 Load (power load) (2nd load), 9 Transformer, 9a Current path, 12 Switch (1st switch), 13 Power converter, 22 Switch (2nd switch), 100,101 Power supply system, 110 House, 120 Current breaker, 200 System power supply, 400 Controller (switching device).

Claims

1. A power supply system that supplies AC power from the grid to the power load of a house, A current circuit breaker that receives AC power from the aforementioned power grid to the house and interrupts the current in the event of a ground fault and / or overcurrent, A load circuit breaker configured to electrically interrupt the connection between the current circuit breaker and the power load, A power converter configured to supply AC power from a vehicle to a power load when the vehicle is connected, A switch configured to switch between electrical connection and disconnection between the load circuit breaker and the power converter, The device comprises a switching device for switching the aforementioned switch on and off, The aforementioned power load is A first load that operates with a first voltage, The system includes a second load that operates on a second voltage different from the first voltage, The aforementioned switch is A first switch configured to switch between electrical connection and disconnection between the first load and the power converter, The system includes a second switch configured to switch between electrical connection and disconnection between the second load and the power converter, The switching device is a power supply system that, when supplying power from the vehicle to the power load, switches the first switch and the second switch on and off based on the power supply capacity of the vehicle, the power demand of the first load, and the power demand of the second load.

2. The power supply system according to claim 1, wherein the switching device electrically connects the first load and the second load to the power converter when the sum of the power consumption of the first load and the power consumption of the second load is less than the upper limit of the power supplied from the vehicle.

3. The power supply system according to claim 2, wherein the switching device electrically connects the power converter to the one of the first and second loads with the higher power consumption, and electrically disconnects the power converter to the one of the first and second loads with the lower power consumption, when the total is greater than or equal to the upper limit of the power supply, and the power consumption of the first load and the second load are each less than the upper limit of the power supply, and the current electricity charges are higher than a predetermined threshold.

4. Each of the first and second loads is assigned a different priority. The power supply system according to claim 2, wherein the switching device electrically connects the higher-priority of the first and second loads to the power converter and electrically disconnects the lower-priority of the first and second loads to the power converter when the total is greater than or equal to the upper limit of the power supply, the power consumption of the higher-priority of the first and second loads is less than the upper limit of the power supply, and the grid power supply is in a state of power outage.

5. The system further includes a transformer that transforms the second voltage into the first voltage, The aforementioned vehicle has an output voltage of the second voltage when power is supplied, The power supply system according to any one of claims 1 to 4, wherein the transformer is located in the current path between the first switch and the power converter.

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