Power supply system

Abstract

This power supply system is provided with: a switch that switches between the electrical connection and disconnection between a load corresponding to 100 V and a power conversion device; and a switch that switches between the electrical connection and disconnection between a load corresponding to 200 V and a power conversion device. When power is supplied from the vehicle to the load, the controller switches the ON / OFF of each of the shutters on the basis of the power supply capability of the vehicle, the power demand of the load, and the power demand of the load.

Description

Technical Field

[0001] This disclosure relates to power supply systems. Background Technology

[0002] In power supply systems capable of supplying electricity from the system power source to the electrical loads of a house, the primary function is to supply power from vehicles to the electrical loads during emergencies (such as when the system power source fails or when the system power source is under strain). In addition, it has been proposed that power be supplied from vehicles to the electrical loads during normal times (such as when the system power source has high electricity rates). Japanese Patent Application Publication No. 2019-71721 discloses a power supply system capable of effectively utilizing the electricity stored in electric vehicles during power outages.

[0003] Although not explicitly stated in the aforementioned Japanese Patent Application Publication No. 2019-71721, sometimes an electrical load includes a first load operating through a first voltage and a second load operating through a second voltage. In this case, it is desirable to appropriately distribute the power supplied from the vehicle to both the first and second loads. Summary of the Invention

[0004] This disclosure was made to solve the above-mentioned problems, and one of the objectives of this disclosure is to provide a power supply system capable of appropriately distributing power supplied from a vehicle to loads with corresponding voltages that are different from each other.

[0005] One aspect of this disclosure relates to a power supply system that supplies AC power from a system power source to electrical loads in a building. The system comprises: a current circuit breaker that receives AC power from the system power source and disconnects at least one of leakage current and overcurrent; a load circuit breaker configured to disconnect the current circuit breaker from the electrical load; a power conversion device configured to supply AC power from a vehicle to the electrical load when a vehicle is connected; a switch configured to switch the electrical connection and disconnection between the load circuit breaker and the power conversion device; and a switching device that switches the switching on and off. The electrical load includes: a first load operating using a first voltage; and a second load operating using a second voltage different from the first voltage. The switch includes: a first switch configured to switch the electrical connection and disconnection between the first load and the power conversion device; and a second switch configured to switch the electrical connection and disconnection between the second load and the power conversion device. When power is supplied from a vehicle to the electrical load, 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.

[0006] The above and other objects, features, aspects and advantages of the present invention will become clear from the following detailed description relating to the invention, which is understood in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 It is a circuit block diagram showing the configuration of a power supply system involved in one implementation.

[0008] Figure 2 This is a flowchart illustrating a first example of processing performed by a controller of a power supply system according to one implementation.

[0009] Figure 3 This is a flowchart illustrating a second example of processing performed by a controller of a power supply system according to one embodiment.

[0010] Figure 4 This is a circuit block diagram illustrating the configuration of a power supply system according to a variation of an implementation. Detailed Implementation

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Furthermore, identical or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will not be repeated.

[0012] <System Composition>

[0013] Figure 1 This is a circuit block diagram illustrating the configuration of the power supply system 100 according to this embodiment. The power supply system 100 includes a house 110, a system power supply 200, and a vehicle 300. In this embodiment, the system power supply 200 is capable of transmitting AC 100V and AC 200V AC power. Furthermore, the output voltage of the vehicle 300 when supplying power is 200V. Therefore, the power conversion device 13 (described later) connected to the vehicle 300 outputs AC 200V AC power. Moreover, 100V and 200V are examples of the "first voltage" and "second voltage" of this disclosure, respectively.

[0014] The power supply system 100 supplies power from the system 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 include non-residential buildings, such as apartment buildings, buildings that store equipment, etc. The loads are, for example, various electrical devices, but may be located either inside (indoors) or outside (outdoors) of the house 110.

[0015] The power supply system 100 includes a meter 1, a main circuit breaker 2, a residual current circuit breaker 3, an overcurrent circuit breaker (load circuit breaker) 4, 5, an overcurrent circuit breaker 6, a load (electrical load) (first load) 7, a load (electrical load) (second load) 8, a transformer 9, a charging switch 10, a switch 11, a switch (first switch) 12, a switch 21, a switch (second switch) 22, a power conversion device 13, a resistive element 14, and a controller (switching device) 400. The number of overcurrent circuit breakers is not particularly limited. Furthermore, switch 12 and switch 22 are examples of a "switch" according to this disclosure. Additionally, switch 12 and switch 22 are examples of a "first switch" and a "second switch" according to this disclosure. Furthermore, controller 400 is an example of a "switching device" according to this disclosure. Furthermore, load 7 and load 8 are examples of an "electrical load" according to this disclosure. Furthermore, load 7 and load 8 are examples of the "first load" and "second load" of this disclosure, respectively. Additionally, overcurrent circuit breaker 4 and overcurrent circuit breaker 5 are examples of the "load circuit breaker" of this disclosure. Furthermore, transformer 9 is an example of the "transformer" of this disclosure.

[0016] Meter 1 receives AC power from system power supply 200 to house 110. Main circuit breaker 2 disconnects the circuit if an abnormality (overcurrent) is detected in the current capacity flowing from system power supply 200. Residual current circuit breaker 3 disconnects the circuit if a leakage current is detected. Meter 1, main circuit breaker 2, and residual current circuit breaker 3 constitute current circuit breaker 120.

[0017] The circuit breaker 120 is connected to a circuit PL1 for transmitting AC 100V power and a circuit PL2 for transmitting AC 200V power.

[0018] The overcurrent circuit breaker 4 is electrically connected to the AC 100V circuit PL1. Although not shown, the house 110 includes multiple rooms. Each of the multiple rooms has a 100V load 7. Additionally, each of the multiple rooms has an overcurrent circuit breaker 4. The overcurrent circuit breaker 4 is configured to electrically disconnect the current circuit breaker 120 from the load 7 upon overcurrent detection. The overcurrent circuit breaker 4 corresponds to the "load circuit breaker" disclosed herein. The load 7 corresponds to the "electrical load" disclosed herein.

[0019] Overcurrent circuit breaker 5 is electrically connected to the AC 200V circuit PL2. Overcurrent circuit breaker 5 is identical to the AC 100V overcurrent circuit breaker 4, and they are installed in multiple rooms of building 110. Overcurrent circuit breaker 5 is configured to electrically disconnect the current circuit breaker 120 from the 200V load 8 upon overcurrent detection. Furthermore, in Figure 1For simplicity, only one load 8 (overcurrent circuit breaker 5) is shown in the diagram.

[0020] 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 driving battery and capable of receiving and exchanging power with external sources. Specifically, the vehicle 300 is a battery electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV). The power conversion device 13 includes an AC / DC converter. The power conversion device 13 is configured to supply AC power from the vehicle 300 to loads 7 and 8 when connected to the vehicle 300.

[0021] The first end of the switch 11 is electrically connected to the current circuit breaker 120. The second end of the switch 11 is electrically connected to the overcurrent circuit breaker 4. Thus, the switch 11 is configured to switch the electrical connection and disconnection between the current circuit breaker 120 and the overcurrent circuit breaker 4 (load 7) according to the control command from the controller 400.

[0022] The first end of the switch 21 is electrically connected to the current circuit breaker 120. The second end of the switch 21 is electrically connected to the overcurrent circuit breaker 5. Thus, the switch 21 is configured to switch the electrical connection and disconnection between the current circuit breaker 120 and the overcurrent circuit breaker 5 (load 8) according to the control command from the controller 400.

[0023] Transformer 9 is positioned in current path 9a between power conversion device 13 and switch 12. The first end of switch 12 is electrically connected to the first end of transformer 9. The second end of transformer 9 is electrically connected to power conversion device 13. The second end of switch 12 is electrically connected to overcurrent circuit breaker 4. Thus, switch 12 is configured to switch and disconnect the electrical connection between transformer 9 (power conversion device 13) and overcurrent circuit breaker 4 (load 7) according to control commands from controller 400. Furthermore, transformer 9 transforms the AC 200V AC power transmitted from power conversion device 13 into AC 100V AC power.

[0024] Therefore, when power is supplied from vehicle 300, the output voltage of vehicle 300 can be made to match the voltage (100V) corresponding to load 7 via transformer 9. As a result, power can be easily supplied from vehicle 300 to load 7.

[0025] Furthermore, large appliances such as water heaters and air conditioners are generally included in load 8 (200V load), so the power demand (power consumption) of load 7 (100V load) is often less than that of load 8. Therefore, by configuring transformer 9 on the current path 9a between the switch 12 and the power conversion device 13 on the side of load 7, where the power demand is relatively small, the capacity of transformer 9 can be made relatively small.

[0026] 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 circuit breaker 5. Thus, the switch 22 is configured to switch and disconnect the electrical connection between the power conversion device 13 and the overcurrent circuit breaker 5 (load 8) according to the control command from the controller 400.

[0027] Resistive element 14 is a high-resistance element. Resistive element 14 is electrically connected to the circuit that connects switch 22 and power conversion device 13.

[0028] The first end of the charging switch 10 is electrically connected to the power conversion device 13. The second end of the charging switch 10 is electrically connected to the first end of the overcurrent circuit breaker 6. The second end of the overcurrent circuit breaker 6 is electrically connected to the second end of the switch 21. Thus, the vehicle 300 can be charged using power supplied from the system power supply 200 via the charging switch 10.

[0029] Although not shown, the current circuit breaker 120 and overcurrent circuit breakers 4, 5, and 6 are installed in the distribution panel (or, depending on the type of building 110, a distribution board). If the distribution panel is large, the switches 11, 12, 21, 22 and the charging switch 10 can also be installed inside the distribution panel. If the distribution panel is small, the switches 11, 12, 21, 22 and the charging switch 10 can also be externally mounted on the distribution panel and housed in a casing located near the distribution panel.

[0030] Controller 400 is a computer device including processor 401 and memory 402. Controller 400 is, for example, a Home Energy Management System (HEMS) controller. Controller 400 outputs control commands for opening and closing (switching on / off) the switches 11, 12, 21, 22 and the charging switch 10. As described later, controller 400 obtains power information (electricity transaction information, electricity bill information, etc.) from the system power supply 200 from an energy management server not shown in the diagram. Controller 400 can also open and close the switches 11, 12, 21, 22 and control the power conversion device 13 (i.e., power supplied from vehicle 300) based on the obtained power information.

[0031] The AC power supplied from system power supply 200 and the AC power supplied from vehicle 300 are in different phases. Therefore, it is not preferable to simultaneously supply loads 7 and 8 with AC power from system power supply 200 and AC power from vehicle 300. Switches 11 and 21 and switches 12 and 22 can be used to select which of the two AC power supplies is supplied to loads 7 and 8. Specifically, by turning on switches 11 and 21, power from system power supply 200 can be used to supply power to loads 7 and 8. By turning on switches 12 and 22, power from vehicle 300 can be used to supply power to loads 7 and 8.

[0032] When using the power of the system power supply 200, power can be supplied to the load 7 by turning on the switch 11, and power can be supplied to the load 8 by turning on the switch 21.

[0033] When using the power of vehicle 300 for power supply, 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.

[0034] Here, when using the power of vehicle 300 to supply power to each load, it is desirable to appropriately distribute the power supplied from the vehicle to each load.

[0035] Therefore, in this embodiment, when power is supplied from vehicle 300 to loads 7 and 8, controller 400 performs switching processing to connect and disconnect switch 12 and switch 22 based on the power supply capacity of vehicle 300 and the power demand of load 7 and load 8. Details are explained below.

[0036] <Processing Flow>

[0037] Figure 2 This is a flowchart illustrating a first example of the processing sequence related to the control of switches 11, 12, 21, and 22. The processing shown in this flowchart is executed when predetermined conditions are met (e.g., at specified intervals). Each step is implemented through software processing by the controller 400 (processor 401), but can also be implemented through hardware (circuit) configured within the controller 400. Hereinafter, each step will be simply referred to as S. The same applies to the other flowcharts described later.

[0038] Here, with Figure 1 The power supply system 100 shown is used as an example for explanation. It is assumed that at the beginning of a series of processes, the switches 11 and 12 are turned on (closed), and the switches 12 and 22 are turned off (open).

[0039] Reference Figure 1 and Figure 2In step S1, the controller 400 determines whether the power conversion device 13 is connected to the vehicle 300. If the power conversion device 13 is connected to the vehicle 300 (yes in S1), the controller 400 proceeds to step S2. If the power conversion device 13 is not connected to the vehicle 300 (no in S1), the controller 400 terminates the process. Alternatively, step S1 can be omitted.

[0040] In S2, the controller 400 obtains power information of the system power supply 200 (in this example, current electricity bill information) from an energy management server (not shown).

[0041] In S3, controller 400 determines whether the current electricity charge obtained in S2 is higher than a base price (e.g., the average price of electricity for the day). If the current electricity charge is higher than the base price (yes in S3), controller 400 proceeds the process to S4. If the current electricity charge is lower than the base price (no in S3), controller 400 proceeds the process to S15. Furthermore, the base price is an example of the "prescribed threshold" of this disclosure.

[0042] In step S4, the controller 400 obtains the State of Charge (SOC) of the battery installed in the vehicle 300 through communication with the vehicle 300. Then, the controller 400 determines whether the SOC obtained in step S4 is higher than the required value (S5). The required value is, for example, a value corresponding to the electric power required for the vehicle 300 to run the next day. The required value can be a predetermined fixed value or a variable value determined based on the actual usage performance of the vehicle 300.

[0043] If the SOC is higher than the desired value (yes in S5), the controller 400 causes the process to proceed to S6. If the SOC is lower than the desired value (no in S5), the controller 400 causes the process to proceed to S13.

[0044] In S6, the controller 400 determines whether the total power consumed by loads 7 and 8 is less than the available power supply from vehicle 300 (the upper limit / lower limit of the power supply, referred to as the power supply capacity). The power consumed by load 7 (8) refers to the power required to supply power to load 7 (8). If the total value is less than the power supply capacity of vehicle 300 (yes in S6), the controller 400 proceeds to S7. If the total value is greater than or equal to the power supply capacity of vehicle 300 (no in S6), the controller 400 proceeds to S8.

[0045] 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 2kW, then controller 400 causes the processing to proceed to S7. Alternatively, 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 controller 400 causes the processing to proceed to S8.

[0046] In S7, controller 400 disconnects switches 11 and 21 respectively, and connects switches 12 and 22 respectively. This stops power supply from system power supply 200 to loads 7 and 8, while power can be supplied from vehicle 300 to loads 7 and 8. As a result, the power supply from vehicle 300 can meet the power requirements of loads 7 and 8 respectively. Next, controller 400 proceeds to S12.

[0047] In S8, the controller 400 determines whether the power consumption of each of the loads 7 and 8 is less than the power supply capacity of the vehicle 300. If the power consumption of each of the 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 the loads 7 and 8 is greater than the power supply capacity of the vehicle 300 (no in S8), the controller 400 proceeds to S10.

[0048] 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 controller 400 causes the processing to proceed to S9. Alternatively, 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 7kW, then controller 400 causes the processing to proceed to S10. Also, if the power supply capacity of vehicle 300 is 6kW, the power consumption of load 7 is 7kW, and the power consumption of load 8 is 7kW, then controller 400 causes the processing to proceed to S10.

[0049] In step S9, the controller 400 connects the switch 12 or 22 corresponding to the load with the higher power consumption and disconnects the other switch. For example, if the vehicle 300 has a power supply capacity of 6kW, the load 7 consumes 3kW of power, and the load 8 consumes 4kW of power, then the controller 400 connects the switch 22 corresponding to load 8 and disconnects the switch 12 corresponding to load 7. Therefore, only the load with the higher power consumption among loads 7 and 8 is supplied with power from the vehicle 300.

[0050] Therefore, when electricity costs are high, power can be supplied from vehicle 300 to the load with the higher power consumption between load 7 and load 8. As a result, the power supplied from system power source 200 related to electricity costs can be effectively reduced, thus easily lowering electricity bills. Furthermore, when the power consumption of load 7 and load 8 are equal, only one of the randomly selected switches 12 and 22 can be switched on.

[0051] Alternatively, at this time, power can also be supplied to the load with lower power consumption from the system power supply 200. Then, the controller 400 initiates processing in S12.

[0052] In S10, the controller 400 determines whether either the power consumption of load 7 or load 8 is less than the power supply capacity of vehicle 300. If either 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 the power supply capacity of vehicle 300 (no in S10), the controller 400 proceeds to S13.

[0053] 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 7kW, then controller 400 causes the processing to proceed to S11. Alternatively, if the power supply capacity of vehicle 300 is 6kW, the power consumption of load 7 is 7kW, and the power consumption of load 8 is 7kW, then controller 400 causes the processing to proceed to S13.

[0054] In S11, the controller 400 connects the switch 12 or 22 corresponding to the load that consumes less power than the power supplied to the vehicle 300, and disconnects 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, then the controller 400 connects switch 12 corresponding to load 7 and disconnects switch 22 corresponding to load 8. At this time, power can also be supplied from the system power supply 200 to loads whose power consumption exceeds the power supply capacity of the vehicle 300. Then, the controller 400 proceeds to S12.

[0055] Furthermore, the above describes an example of performing S10 after S8, but S10 can also be performed before S8.

[0056] In S12, controller 400 initiates power supply control from vehicle 300 to load 7 and / or load 8. Furthermore, having initiated the aforementioned power supply control, controller 400 continues the power supply control process. Then, controller 400 returns the processing to S4.

[0057] In S13, controller 400 terminates the power supply control from vehicle 300 to load 7 and / or load 8. Then, controller 400 initiates processing in S14.

[0058] In S14, the controller 400 turns on the openers 11 and 21 respectively, and turns off the openers 12 and 22 respectively. After that, the controller 400 ends a series of processing steps.

[0059] In S15, the controller 400 controls the power supply from the system power supply 200 to each of the loads 7 and 8 via the switches 11 and 12. Then, the controller 400 proceeds to S16.

[0060] In S16, the controller 400 terminates the power supply control from the system power supply 200 to each of the loads 7 and 8. Afterwards, the controller 400 completes a series of processing steps.

[0061] Figure 3 This is a flowchart illustrating a second example of the processing sequence related to the control of switches 11, 12, 21, and 22. The processes shown in this flowchart are executed when predetermined conditions are met (e.g., at specified intervals).

[0062] Here, with Figure 1 The power supply system 100 shown is used as an example for explanation. It is assumed that at the start of a series of processes, switches 11 and 12 are turned on (closed), and switches 12 and 22 are turned off (open). Furthermore, in this embodiment, the priority of the loads supplied by the vehicle 300 when the system power supply 200 fails is preset. For example, the priority of load 8 is set higher than the priority of load 7.

[0063] Reference Figure 1 and Figure 3 In step S21, the controller 400 determines whether the power conversion device 13 is connected to the vehicle 300. If the power conversion device 13 is connected to the vehicle 300 (yes in S21), the controller 400 proceeds to step S22. If the power conversion device 13 is not connected to the vehicle 300 (no in S21), the controller 400 terminates the process. Alternatively, step S21 can be omitted.

[0064] In S22, the controller 400 obtains power information of the system power supply 200 (in this example, the power supply status of the system power supply 200) from an energy management server (not shown).

[0065] In S23, the controller 400 determines whether the system power supply 200 is interrupted based on the information obtained in S22. If the system power supply 200 is interrupted (yes in S23), the controller 400 proceeds to S24. If the system power supply 200 is not interrupted (no in S23), the controller 400 proceeds to S32.

[0066] In S24, the controller 400 disconnects each of the switches 11 and 21 corresponding to the system power supply 200. Then, the controller 400 proceeds to S25.

[0067] In step S25, the controller 400 determines whether the total power consumption of loads 7 and 8 before the power outage is less than the power supply capacity of vehicle 300. If the total value before the power outage is less than the power supply capacity of vehicle 300 (yes in S25), the controller 400 proceeds to step S26. If the total value is greater than or equal to the power supply capacity of vehicle 300 (no in S25), the controller 400 proceeds to step S27. Furthermore, information on the power consumption of loads 7 and 8 at each time point can also be stored in the controller 400's memory 402.

[0068] In S26, the controller 400 turns on the switches 12 and 22 respectively. This allows power to be supplied from the vehicle 300 to the loads 7 and 8. Next, the controller 400 proceeds to S31.

[0069] In S27, the controller 400 determines whether the power consumption of the higher-priority load 7 or 8 before a 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 greater than the power supply capacity of the vehicle 300 (no in S27), the controller 400 proceeds to S29.

[0070] In S28, the controller 400 connects the switch 12 to the switch 22 corresponding to the load with higher priority, and disconnects the other switch. For example, if the power supply capacity of vehicle 300 is 6kW and the power consumption of load 8 is 3kW, the controller 400 connects the switch 22 corresponding to load 8 and disconnects the switch 12 corresponding to load 7. Then, the controller 400 proceeds to S31.

[0071] Therefore, in the event of a power outage in the system power supply 200, power from the vehicle 300 can be used to enable the higher priority (importance) load 7 to resume operation more quickly.

[0072] In S29, the controller 400 determines whether the power consumption of the lower-priority load 7 or 8 before a 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 greater than or equal to the power supply capacity of the vehicle 300 (no in S29), the controller 400 proceeds to S32.

[0073] Furthermore, the above describes an example of performing S29 after S27, but S29 can also be performed before S27.

[0074] In S31, the controller 400 initiates power supply control from the vehicle 300 to the load 7 and / or the load 8. Furthermore, having initiated the aforementioned power supply control, the controller 400 continues performing the power supply control. Then, the controller 400 returns the processing to S23.

[0075] In S32, controller 400 terminates the power supply control from vehicle 300 to load 7 and / or load 8. Then, controller 400 initiates processing in S33.

[0076] In S33, controller 400 turns on open / close devices 11 and 21 respectively, and turns off open / close devices 12 and 22 respectively. After that, controller 400 ends a series of processing steps.

[0077] As described above, in this embodiment, when power is supplied from vehicle 300 to loads 7 and 8, controller 400 performs switching processing to open and close switch 12 and switch 22 based on the power supply capacity of vehicle 300 and the power demand of loads 7 and 8. Therefore, the power supplied to load 7 and load 8 can be appropriately adjusted based on the power supply capacity of vehicle 300 and the power demand of loads 7 and 8. Thus, the power supplied from vehicle 300 can be appropriately distributed to loads 7 and 8.

[0078] [Variation Example]

[0079] In the above embodiments, an example of supplying power to all devices of load 8 in the case of power supply from vehicle 300 to, for example, load 8 is shown, but this disclosure is not limited to this. It is also possible to supply power to a portion of the devices of load 8. Furthermore, load 8 is given as an example, but it is also possible to supply power to a portion of the devices of load 7 instead of load 8 / based on load 8. Figure 4 The example of supplying power from vehicle 300 to a portion of load 8 is illustrated below. Furthermore, in... Figure 4 In the example shown, load 8 can also have a higher priority than load 7.

[0080] Figure 4 The power supply system 101 shown includes an overcurrent circuit breaker 15. Additionally, in Figure 4 In the example shown, load 8 includes load 8a and load 8b. Load 8b is a load with particularly high priority among loads 8. Load 8b can also be selected as a load whose total power consumption is below the power supply capacity of vehicle 300.

[0081] The first terminal of the overcurrent circuit breaker 15 is electrically connected to the switch 22. The second terminal of the overcurrent circuit breaker 15 is electrically connected to the load 8b. In addition, the loads 8a and 8b are each electrically connected to the overcurrent circuit breaker 5.

[0082] exist Figure 4 In the configuration shown, in Figure 3 In the various determinations shown, the power consumption of load 8b, instead of load 8, becomes the basis for determination. Therefore, it is possible to more reliably supply power from vehicle 300 to load 8b, which has a particularly high priority among the higher-priority loads 8. Furthermore, in Figure 2 In the various determinations shown, the power consumption of load 8b can also be used as the basis for determination instead of the power consumption of load 8. In addition, the priority of load 8 can be lower than that of load 7.

[0083] In the above embodiment, an example is shown where the transformer 9 is electrically connected to the switch 12 on the load 7 side, but the present invention is not limited thereto. Alternatively, a transformer electrically connected to the switch 22 on the load 8 side may be configured instead of the transformer 9.

[0084] In the above embodiment, an example is shown of supplying power from vehicle 300 to a load based on load priority in the event of a power outage of system power supply 200; however, this disclosure is not limited thereto. Even in the event of a power outage of system power supply 200, power can be supplied... Figure 2 The determinations are shown below. Additionally, even when the system power supply 200 is not interrupted, it can still be used with... Figure 3 Each of the decisions shown is based on priority.

[0085] In the above embodiments, an example is shown where the current circuit breaker 120 includes a main circuit breaker 2 and a residual current circuit breaker 3, but the present invention is not limited thereto. The current circuit breaker may also include only either the main circuit breaker 2 or the residual current circuit breaker 3.

[0086] In the above embodiment, it is shown that the controller 400 is capable of performing... Figure 2 and Figure 3 Examples of their respective processing flows are provided, but this disclosure is not limited thereto. A controller may also be able to execute only... Figure 2 and Figure 3 The processing flow for either party in the process.

[0087] Embodiments of the present invention have been described, but all points of the embodiments disclosed herein should be considered illustrative and not intended to limit the invention. The scope of the invention is defined by the technical solutions and is intended to include equivalents and all modifications within that scope.

Claims

1. A power supply system that supplies AC power from a system power source to the electrical loads of a building, characterized in that, The power supply system has the following features: A current circuit breaker that receives AC power from the system power supply to the house and disconnects at least one of the current in case of leakage or overcurrent. A load circuit breaker configured to electrically disconnect the current circuit breaker from the electrical load; A power conversion device configured to supply AC power from the vehicle to the electrical load when the vehicle is connected; The switch is configured to switch the electrical connection and disconnection between the load circuit breaker and the power conversion device. as well as The switching device switches the connection and disconnection of the switch. The power load includes: The first load operates using the first voltage; and The second load operates using a second voltage that is different from the first voltage. The switch includes: A first switch is configured to switch the electrical connection and disconnection between the first load and the power conversion device; and The second switch is configured to switch the electrical connection between the second load and the power conversion device. When power is supplied from the vehicle to the electrical load, the switching device switches the connection and disconnection of the first switch and the second switch 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, characterized in that, If the combined power consumption of the first load and the second load is less than the upper limit of the power supply from the vehicle, the switching device electrically connects the first load and the second load to the power conversion device respectively.

3. The power supply system according to claim 2, characterized in that, When the total power supply exceeds the upper limit, and the power consumption of the first load and the power consumption of the second load are respectively less than the upper limit of the power supply, and when the current electricity cost is higher than a predetermined threshold, the switching device electrically connects the load with the higher power consumption to the power conversion device and electrically disconnects the load with the lower power consumption from the power conversion device.

4. The power supply system according to claim 2, characterized in that, The first load and the second load are assigned different priorities. When the total power supply exceeds the upper limit, and the power consumption of the higher priority load among the first and second loads is less than the upper limit, and in the event of a system power outage, the switching device electrically connects the higher priority load among the first and second loads to the power conversion device, and electrically disconnects the lower priority load among the first and second loads from the power conversion device.

5. The power supply system according to any one of claims 1 to 4, characterized in that, The power supply system also includes a transformer that transforms the second voltage into the first voltage. The output voltage of the vehicle when it is powered is the second voltage. The transformer is positioned in the current path between the first switch and the power conversion device.

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