Power supply system

Abstract

A power supply system (101) supplies AC power from a system power supply (900) to a load (123) of a house (101A). The first electromagnetic switch (51) is configured so as to be capable of switching between electrical connection and disconnection between the residual current circuit breaker (1) and the overcurrent circuit breaker (113). The second electromagnetic switch (52) is configured so as to be capable of switching between electrical connection and disconnection between the first electromagnetic switch (51) and the power supply device (3), and to be capable of switching between electrical connection and disconnection between the overcurrent breaker (113) and the power supply device (3).

Description

Technical Field

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

[0002] In power supply systems that can supply electricity from a utility power source to a house's electrical loads, it is possible to supply electricity from a vehicle to the loads, primarily in emergencies (e.g., during utility power outages or power shortages). Alternatively, it is proposed to supply power from a vehicle to the loads during normal times (e.g., during periods of high utility power rates). Japanese Patent Application Laid-Open No. 2019-71721 discloses a power supply system that can utilize the electricity stored in an electric vehicle during a power outage. Summary of the Invention

[0003] The AC power supplied from the system power supply and the AC power supplied from the vehicle are out of phase. Therefore, it is not preferable to supply both the AC power from the system power supply and the AC power from the vehicle to the electrical load simultaneously. It is desirable to achieve the simplest possible system configuration for power supply from the vehicle to the electrical load.

[0004] The present disclosure has been made to solve the above-mentioned problems, and one of the objects of the present disclosure is to provide a power supply system capable of supplying power from a vehicle to an electrical load with a simple system configuration.

[0005] An electric power supply system according to one aspect of the present disclosure supplies AC power from a system power supply to an electric load in a house. The electric power supply system includes a circuit breaker, a load circuit breaker, a power conversion device, a first switch, and a second switch. The circuit breaker receives AC power from the system power supply to the house and cuts off the power in at least one of the cases of leakage and overcurrent. The load circuit breaker is configured to electrically cut off the connection between the circuit breaker and the electric load. The power conversion device is configured to supply AC power from the vehicle to the electric load when a vehicle is connected. The first switch is configured to be able to switch the electrical connection and disconnection between the circuit breaker and the load circuit breaker. The second switch is configured to be able to switch the electrical connection and disconnection between the first switch and the power conversion device, and to be able to switch the electrical connection and disconnection between the load circuit breaker and the power conversion device.

[0006] In the above-described power supply system, the house may include a power conditioner that receives power generated by the solar power generation device. The power conversion device may be configured to charge a vehicle using the AC power from the power conditioner when the vehicle is connected. The power supply system may further include a third switch configured to switch between electrical connection and disconnection between the power conditioner and the power conversion device.

[0007] In the above-mentioned power supply system, the power conversion device may be further configured to charge the vehicle using AC power from the circuit breaker when the vehicle is connected. The power supply system may further include a third switch configured to switch between electrical connection and disconnection between the circuit breaker and the power conversion device.

[0008] In the above power supply system, when the vehicle is connected to the power conversion device and the current electricity rate is higher than the electricity rate when the vehicle is charged with the currently charged electric power, the first switch may be opened and the second switch may be closed.

[0009] In the above-described power supply system, when the vehicle is connected to the power conversion device and a current electricity rate is higher than an electricity rate when the vehicle was last charged, the first switch may be opened and the second switch may be closed.

[0010] The above-mentioned power supply system may further include a control device that controls the first switch and the second switch.

[0011] The control device may close the first switch and open the second switch when supplying power from the system power supply to the power load. The control device may open the first switch and close the second switch when supplying power from the vehicle to the power load.

[0012] The above-mentioned power supply system may further include a control device that controls the first switch, the second switch, and the third switch.

[0013] The control device may open the first switch, close the second switch, and open the third switch when power is supplied from the vehicle. The control device may close the first switch, open the second switch, and close the third switch when charging the vehicle. The control device may close the first switch, open the second switch, and open the third switch when neither power is supplied from the vehicle nor charging the vehicle.

[0014] According to the present disclosure, it is possible to supply power from a vehicle to an electrical load with a simple system configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals represent like elements, and in which: Figure 1 This is a circuit block diagram showing a first example of the configuration of the power supply system according to the first embodiment.

[0016] Figure 2 This is a circuit block diagram showing a second example of the configuration of the power supply system according to the first embodiment.

[0017] Figure 3 This is a flowchart showing a first example of a processing procedure related to control of an electromagnetic switch.

[0018] Figure 4 This is a circuit block diagram showing a first example of the configuration of the power supply system according to the second embodiment.

[0019] Figure 5 This is a circuit block diagram showing a second example of the configuration of the power supply system according to the second embodiment.

[0020] Figure 6 This is a circuit block diagram showing a third example of the configuration of the power supply system according to the second embodiment.

[0021] Figure 7 This is a circuit block diagram showing a fourth example of the configuration of the power supply system according to the second embodiment.

[0022] Figure 8 This is a flowchart showing a second example of the processing procedure related to the control of the electromagnetic switch.

[0023] Figure 9 This is a flowchart showing a third example of the processing procedure related to the control of the electromagnetic switch.

[0024] Figure 10 This is a circuit block diagram showing a modified example of the first example of the configuration of the power supply system according to the first embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, identical or corresponding parts are denoted by the same reference numerals, and their description will not be repeated.

[0026] Implementation Method 1

[0027] System Structure

[0028] Figure 1 This is a circuit block diagram illustrating a first example of the configuration of a power supply system according to Embodiment 1. Power supply system 101 supplies power from system power supply 900 to loads in house 101A. House 101A is typically a residence (a building where people live). However, house 101A may include non-residential structures, such as buildings or structures housing equipment. The loads, for example, various electrical devices, may be located inside (indoors) or outside (outdoors) of house 101A.

[0029] The power supply system 101 includes an earth leakage circuit breaker 1, overcurrent circuit breakers 111 to 113, 211, and 212, and a power supply device 3. The number of overcurrent circuit breakers is not particularly limited.

[0030] Earth leakage circuit breaker 1 receives AC power from power grid 900 to house 101A. Circuit PL1, which transmits 100V AC power, and circuit PL2, which transmits 200V AC power, are connected to earth leakage circuit breaker 1. When an electric leakage is detected, earth leakage circuit breaker 1 electrically disconnects power grid 900 from circuits PL1 and PL2. Earth leakage circuit breaker 1 corresponds to the "current breaker" in this disclosure.

[0031] Overcurrent circuit breakers 111 to 113 are electrically connected to circuit PL1 for AC 100V. Although not shown, house 101A includes multiple rooms. For example, load 121 is installed in one room, load 122 is installed in another room, and load 123 is installed in yet another room. Overcurrent circuit breakers 111 to 113 are installed corresponding to different rooms in house 101A. Overcurrent circuit breakers 111 to 113 are configured to electrically disconnect the leakage circuit breaker 1 from loads 121 to 123 when an overcurrent is detected. Overcurrent circuit breaker 113 corresponds to the "load circuit breaker" in the present disclosure. Each load corresponds to the "power load" in the present disclosure.

[0032] Overcurrent breakers 211 and 212 are electrically connected to the 200V AC circuit PL2. Similar to the 100V AC overcurrent breakers 111 to 113, overcurrent breakers 211 and 212 are installed in different rooms of house 101A. Overcurrent breakers 211 and 212 are configured to electrically disconnect the earth leakage circuit breaker 1 from loads 221 and 222, respectively, when an overcurrent is detected.

[0033] Power supply device 3 is connected to vehicle 4 via a power supply cable (not shown). Vehicle 4 is an electric vehicle equipped with a driving battery and capable of transferring power to and from the vehicle's exterior. Specifically, it is a battery electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV). Power supply device 3 includes an AC / DC converter and, when connected to vehicle 4, is configured to supply AC power from vehicle 4 to a load (load 123 in this example). Power supply device 3 is an example of a "power conversion device" in the present disclosure.

[0034] The power supply system 101 further includes a first electromagnetic switch 51 , a second electromagnetic switch 52 , and a controller 10 .

[0035] A first end of the first electromagnetic switch 51 is electrically connected to the AC 100 V circuit PL1. A second end of the first electromagnetic switch 51 is electrically connected to the overcurrent breaker 113. Thus, the first electromagnetic switch 51 is configured to switch between electrical connection and disconnection between the leakage circuit breaker 1 and the overcurrent breaker 113 in accordance with control commands from the controller 10.

[0036] A first end of the second electromagnetic switch 52 is electrically connected to a second end of the first electromagnetic switch 51 and to the overcurrent circuit breaker 113. A second end of the second electromagnetic switch 52 is electrically connected to the power supply device 3. Thus, the second electromagnetic switch 52 is configured to switch between electrical connection and disconnection between the first electromagnetic switch 51 and the power supply device 3, and to switch between electrical connection and disconnection between the overcurrent circuit breaker 113 and the power supply device 3, in accordance with control commands from the controller 10.

[0037] Although not shown, the leakage circuit breaker 1 and overcurrent circuit breakers 111-113, 211, and 212 are installed in a distribution board (which may also be a switchboard, depending on the type of building 101A). In a large distribution board, the first electromagnetic switch 51 and the second electromagnetic switch 52 may be located inside the distribution board. In a small distribution board, the first electromagnetic switch 51 and the second electromagnetic switch 52 may be located inside a box located outside the distribution board and near the distribution board.

[0038] The first electromagnetic switch 51 corresponds to the “first switch” of the present disclosure, and the second electromagnetic switch 52 corresponds to the “second switch” of the present disclosure. The first electromagnetic switch 51 and the second electromagnetic switch 52 are also collectively referred to as “electromagnetic switches”.

[0039] The controller 10 is a computer device including a processor 11 and a memory 12, and is, for example, a home energy management system (HEMS) controller. The controller 10 outputs control commands for opening and closing (switching on / off) the first and second electromagnetic switches 51 and 52, respectively. As described later, the controller 10 can also obtain power information (such as power transaction information and electricity rate information) from the system power supply 900 from an energy management server (not shown) and, based on this power information, open and close the first and second electromagnetic switches 51 and 52, or control the power supply device 3 (i.e., the power supply from the vehicle 4). The controller 10 corresponds to the "control device" in this disclosure.

[0040] The AC power supplied from system power supply 900 and the AC power supplied from vehicle 4 are out of phase. Therefore, it is not preferable to supply both the AC power from system power supply 900 and the AC power from vehicle 4 to loads 121 to 123 simultaneously. According to the first embodiment, first electromagnetic switch 51 and second electromagnetic switch 52 can be used to select which of the two AC powers is supplied to loads 121 to 123.

[0041] Figure 2 This is a circuit block diagram showing a second example of the configuration of the power supply system according to the first embodiment. Figure 2 Hereinafter, illustration of the house 101A and the controller 10 will be omitted.

[0042] Figure 2 The power supply system 102 shown is Figure 1 The power supply system 101 shown is different in that the first electromagnetic switch 51 is electrically connected to the circuit PL1 for AC 100 V, and the second electromagnetic switch 52 is electrically connected to the circuit PL1 for AC 100 V.

[0043] exist Figure 1 In the power supply system 101 shown, the first electromagnetic switch 51 is provided at a position corresponding to the upstream of the overcurrent breaker 113. Therefore, only the overcurrent breaker 113 is disconnected from the leakage circuit breaker 1 by opening and closing the first electromagnetic switch 51. Figure 2 The first electromagnetic switch 51 is not only located upstream of the overcurrent circuit breaker 113, but also upstream of the overcurrent circuit breakers 111 and 112 in other rooms. Therefore, when the first electromagnetic switch 51 is opened, it disconnects all three overcurrent circuit breakers 111-113 from the leakage circuit breaker 1.

[0044] As such, the placement of the first electromagnetic switch 51 is not limited as long as it can switch the electrical connection between the leakage circuit breaker 1 and at least one overcurrent circuit breaker. The first electromagnetic switch 51 can be placed in any position as long as it can switch the electrical connection between the leakage circuit breaker 1 and at least one of the overcurrent circuit breakers 111-113.

[0045] In the second example, the first end of the second electromagnetic switch 52 is electrically connected to the AC 100 V circuit PL1 (ie, single-phase three-wire), thereby supplying AC power from the vehicle 4 not only to the load 123 but also to the other loads 121 and 122 .

[0046] The configuration of the power supply system 102 other than the arrangement of the first electromagnetic switch 51 and the second electromagnetic switch 52 is the same as the corresponding configuration of the power supply system 101 , and therefore detailed description thereof will not be repeated.

[0047] In addition, another electromagnetic switch (not shown) may be electrically connected, for example, between the overcurrent breaker 113 and the load 123 (in other words, at a position corresponding to the downstream of the load 123 ) instead of the first electromagnetic switch 51 .

[0048] Processing Flow

[0049] Figure 3 This is a flowchart illustrating a first example of a processing sequence related to controlling an electromagnetic switch. The processing shown in this flowchart is executed when predetermined conditions are met (e.g., at predetermined intervals). Each step is implemented through software processing by the controller 10 (processor 11), but can also be implemented through hardware (circuitry) within the controller 10. Hereinafter, a step is referred to as S. This applies similarly to the other flowcharts described below.

[0050] Here, Figure 1 The power supply system 101 shown is described as an example. When a series of processes starts, it is assumed that the first electromagnetic switch 51 is turned on (closed) and the second electromagnetic switch 52 is turned off (open).

[0051] Reference Figure 1 as well as Figure 3 In S100, the controller 10 determines whether the power supply device 3 is connected to the vehicle 4. If the power supply device 3 is connected to the vehicle 4 (YES in S100), the controller 10 proceeds to S101. If the power supply device 3 is not connected to the vehicle 4 (NO in S100), the controller 10 ends the process. The process in S100 may be omitted.

[0052] In S101 , the controller 10 obtains power information (current electricity rate information in this example) of the system power supply 900 from, for example, an energy management server (not shown).

[0053] In S102 , the controller 10 determines whether the current electricity rate acquired in S101 is higher than a reference price (eg, the average price of electricity for the day). If the current electricity rate is higher than the reference price (YES in S102 ), the controller 10 proceeds to S103 .

[0054] In S103, the controller 10 obtains the state of charge (SOC) of the battery mounted on the vehicle 4 through communication with the vehicle 4 or other means. The controller 10 then determines whether the obtained SOC is higher than a required value (S104). The required value is, for example, a value corresponding to the amount of power required for the vehicle 4 to travel the next day. The required value can be a predetermined fixed value or a variable value determined based on the actual usage of the vehicle 4.

[0055] If the SOC is higher than the required value (YES in S104 ), the controller 10 proceeds with the process to S105 . If the SOC is lower than the required value (NO in S104 ), the controller 10 proceeds with the process to S109 .

[0056] In S105, the controller 10 obtains information on the electricity cost of the vehicle 4 when it was last charged, for example, from an energy management server (not shown). Then, in S106, the controller 10 calculates the difference between the current electricity cost (the information obtained in S101) and the electricity cost of the last charge (the information obtained in S105), and determines whether the difference is greater than a threshold value α. If the difference is greater than the threshold value α (YES in S106), the controller 10 proceeds to S107. If the difference is less than the threshold value α (NO in S106), the controller 10 proceeds to S109. In this embodiment, the threshold value α is a positive value, but the threshold value α may also be 0. In this embodiment, an example of calculating the difference is shown, but instead of the difference, a determination equivalent to that in S106 may be made based on, for example, the ratio of b to a (b / a).

[0057] Here, for the sake of explanation, the current electricity charge and the electricity charge at the time of last charging are set as a and b respectively. In addition, the empty capacity of the power in the load 123 is set as x. In addition, the amount of electricity consumed by the ECU, etc. when charging the vehicle 4 (the loss of electricity) is set as L. In this case, the benefit obtained by the user when the vehicle 4 discharges to the load 123 is bx-ax-aL. In order for bx-ax-aL to be greater than 0, the condition of (ba)>aL / x needs to be satisfied. That is, the smaller the difference between b and a, the larger the threshold value of x for the user to obtain benefits. The controller 10 can set aL / x as the threshold value α, or set the sum of aL / x and an arbitrary value as the threshold value α. In this way, it is possible to suppress the financial loss caused by the power supply from the vehicle 4 to the load 123. In addition, the controller 10 can also obtain the information of x from the load 123. In addition, L can also be stored in the memory 12 ( Figure 1 ) is a fixed value.

[0058] In S105 , the electricity rate information of the last charge is obtained, but the present disclosure is not limited thereto. For example, if the electric power currently stored in the vehicle 4 is accumulated through multiple charges in the past, the average value of the multiple charges may be obtained.

[0059] The controller 10 turns off the first electromagnetic switch 51 and turns on the second electromagnetic switch 52 ( S107 ). The controller 10 then controls the power supply device 3 to start supplying power from the vehicle 4 to the load 123 ( S108 ), and returns the process to S103 .

[0060] As power continues to be supplied from vehicle 4, the SOC decreases over time. If the SOC falls below the required value (No in S104), controller 10 controls power supply device 3 to terminate power supply from vehicle 4 to load 123 (S109). Controller 10 then turns on first electromagnetic switch 51 and off second electromagnetic switch 52 (S110). This completes the series of processes.

[0061] In addition, as will be described later in the second embodiment, if a charging device is provided in addition to the power supply device 3, or a bidirectional power conversion device is provided instead of the power supply device 3 (see Figure 4 、 Figure 5 ), when the electricity rate is lower than the base price (No in S102 ), the controller 10 may control the charging device or the bidirectional power conversion device to charge the vehicle 4 ( S111 , S112 ).

[0062] exist Figure 3 In the example described above, the subsequent processing is changed depending on whether the electricity rate is higher than the base rate. Alternatively, the controller 10 can also switch the processing based on whether it is the nighttime period (a period when the nighttime electricity rate applies). This can also save electricity costs.

[0063] Alternatively, controller 10 may switch processing based on whether it is the current time period when house 101A's power demand reaches its peak. By supplying power from vehicle 4 during the time period when power demand reaches its peak, the peak power demand can be supplied even if the maximum supply current from system power supply 900 is low, thereby reducing the so-called contract amperage. Consequently, electricity costs can be reduced.

[0064] As described above, in the first embodiment, power supply systems 101 and 102 include a first electromagnetic switch 51 and a second electromagnetic switch 52. By using the first and second electromagnetic switches 51 and 52, it is possible to select which of the AC power from system power supply 900 and the AC power from vehicle 4 is supplied to loads 121 to 123. More specifically, by turning on the first electromagnetic switch 51 and turning off the second electromagnetic switch 52, the AC power from system power supply 900 is selected. Conversely, by turning off the first electromagnetic switch 51 and turning on the second electromagnetic switch 52, the AC power from vehicle 4 is selected. Therefore, according to the first embodiment, power from vehicle 4 can be supplied to loads with a simple system configuration that only requires the addition of two electromagnetic switches.

[0065] Implementation Method 2

[0066] In the second embodiment, a configuration will be described in which a vehicle can be charged using electric power generated by a solar power generation device.

[0067] System Structure

[0068] Figure 4 This is a circuit block diagram showing a first example of the configuration of the power supply system according to the second embodiment. Figure 4 The power supply system 201 shown in FIG. 1 is similar to the power supply systems 101 and 102 according to the first embodiment (see FIG. Figure 1 as well as Figure 2 ) is different from the first embodiment in that it further includes a third electromagnetic switch 53, a charging device 6, a power conditioner (Power Conditioning System: PCS) 7 and a solar power generation device 8.

[0069] The first end of the third electromagnetic switch 53 is electrically connected to the power conditioner 7. The second end of the third electromagnetic switch 53 is electrically connected to the charging device 6. Thus, the third electromagnetic switch 53 is configured to be electrically connected to the power conditioner 7 according to the controller 10 (see Figure 1 ) to switch the electrical connection and disconnection between the power conditioner 7 and the charging device 6. The third electromagnetic switch 53 is equivalent to the "third switch" of the present disclosure.

[0070] Charging device 6 is connected to vehicle 4 via a charging cable (not shown) (the charging cable and power supply cable may also be shared). Charging device 6 includes an AC / DC converter and, when connected to vehicle 4, is configured to charge vehicle 4 using AC power from power conditioner 7. In this example, power supply device 3 and charging device 6 correspond to the "power converter" in this disclosure.

[0071] The power conditioner 7 receives DC power from the solar power generation device 8 and converts the DC power into AC power. The power conditioner 7 outputs the AC power to the leakage circuit breaker 1 and to the charging device 6 via the third electromagnetic switch 53.

[0072] Since the configuration of the power supply system 201 excluding the third electromagnetic switch 53 , the charging device 6 , the power conditioner 7 , and the solar power generation device 8 is the same as the corresponding configuration of the power supply systems 101 and 102 , detailed description thereof will not be repeated.

[0073] Figure 5 This is a circuit block diagram showing a second example of the configuration of the power supply system according to the second embodiment. Figure 5 The power supply system 202 shown is different from the power supply system 201 (see Figure 4 ) is that a bidirectional power conversion device 9 is provided instead of the power supply device 3 and the charging device 6 (in other words, the power supply device 3 and the charging device 6 are combined into one).

[0074] Figure 6 This is a circuit block diagram showing a third example of the configuration of the power supply system according to the second embodiment. Figure 6 The power supply system 203 shown is the same as the power supply system 201 (see Figure 4 ) is that the first end of the third electromagnetic switch 53 is electrically connected to the leakage circuit breaker 1 (circuit PL2 for AC200V) instead of the power conditioner 7. Figure 6 In the embodiment, a bidirectional power conversion device 9 may be provided instead of the power supply device 3 and the charging device 6 .

[0075] Figure 7 This is a circuit block diagram showing a fourth example of the configuration of the power supply system according to the second embodiment. Figure 7 The power supply system 204 shown is similar to the power supply system 202 (see Figure 5 ). The first difference is that the bidirectional power conversion device 9 is electrically connected to the leakage circuit breaker 1 (circuit PL2 for AC 200V). The second difference is that the power supply system 204 does not include the third electromagnetic switch 53, and the bidirectional power conversion device 9 can switch between power supply and charging of the vehicle 4.

[0076] Figures 5 to 7 The power supply systems 202 to 204 shown in FIG. Figure 4 The corresponding structures of the illustrated power supply system 201 are the same, and therefore detailed description will not be repeated.

[0077] Processing Flow

[0078] Figure 8This is a flowchart showing a second example of the processing sequence related to the control of the electromagnetic switch. Figure 4 The power supply system 201 shown is described as an example. When a series of processes starts, it is assumed that the first electromagnetic switch 51 is turned on, the second electromagnetic switch 52 is turned off, and the third electromagnetic switch 53 is turned off.

[0079] In S200, the controller 10 determines whether the power supply device 3 and the charging device 6 are connected to the vehicle 4. If the power supply device 3 and the charging device 6 are connected to the vehicle 4 (YES in S200), the controller 10 proceeds to S201. If the power supply device 3 and the charging device 6 are not connected to the vehicle 4 (NO in S200), the controller 10 terminates the process. The process in S200 may be omitted.

[0080] In S201, the controller 10 obtains information about the power generated by the solar power generator 8 and information about the power consumption (load power) of each load within the house 101A. The controller 10 determines whether the amount of power generated (generated power) within a predetermined time period is greater than the amount of power loaded (load power) within the same predetermined time period. If the generated power is greater than the load power (YES in S201), the controller 10 proceeds to S202.

[0081] In S202, the controller 10 determines whether the amount of power generated by the solar power generation device 8 is greater than a predetermined amount. The predetermined amount is defined as an amount of power sufficient to charge the vehicle 4. If the amount of power generated by the solar power generation device 8 is greater than the predetermined amount (YES in S202), the controller 10 proceeds to S203.

[0082] In S203, the controller 10 determines whether the SOC of vehicle 4 is higher than the required value. As described above, the required value can be determined as a value corresponding to the amount of electricity required for vehicle 4 to travel the next day. If the SOC is higher than the required value (YES in S203), that is, if the amount of electricity generated by the solar power generation device 8 is sufficient to charge vehicle 4 but the amount of electricity required for travel is already stored in vehicle 4, the controller 10 turns on the first electromagnetic switch 51, turns off the second electromagnetic switch 52, and turns off the third electromagnetic switch 53 (S204). At this point, neither power is supplied from vehicle 4 nor is charging of vehicle 4. The AC power from the system power supply 900 or the power generated by the solar power generation device 8 (AC-converted power) is supplied to the load 123.

[0083] If the SOC is below the required value ("No" in S203), that is, if the power generated by solar power generation device 8 is sufficient to charge vehicle 4 but the amount of power stored in vehicle 4 is insufficient, controller 10 turns on first electromagnetic switch 51, turns off second electromagnetic switch 52, and turns on third electromagnetic switch 53 (S205). In this case, vehicle 4 is charged using the power generated by solar power generation device 8. AC power from system power supply 900 or power generated by solar power generation device 8 is supplied to load 123.

[0084] Returning to S202, if the power generation of solar power generator 8 is below the specified level (No in S202), that is, if the power generation is greater than the load but insufficient to charge vehicle 4, controller 10 turns on first electromagnetic switch 51, turns off second electromagnetic switch 52, and turns off third electromagnetic switch 53 (S206). At this point, neither power is supplied from vehicle 4 nor is charging of vehicle 4. AC power from system power supply 900 or power generated by solar power generator 8 is supplied to load 123.

[0085] Returning to S201, if the power generation of solar power generation device 8 is less than the load (No in S201), that is, if solar power generation device 8 alone cannot meet the power demand of house 101A, controller 10 proceeds to S207. In S207, controller 10 determines whether the SOC of vehicle 4 is higher than a required value. The required value may be the same as or different from the required value in S203.

[0086] If the SOC is higher than the required value (YES in S207), that is, if there is sufficient power stored in the vehicle 4, the controller 10 proceeds to S208. If the SOC is lower than the required value (NO in S207), the controller 10 proceeds to S211.

[0087] In S208, the controller 10 obtains information on the electricity charge when the vehicle 4 was last charged, for example, from an energy management server (not shown). Then, in S209, the controller 10 calculates the difference between the current electricity charge and the electricity charge when the vehicle 4 was last charged, the information of which was obtained in S208, and determines whether the difference is greater than a threshold value α. If the difference is greater than the threshold value α (yes in S209), the controller 10 causes the process to proceed to S210. If the difference is less than the threshold value α (no in S209), the controller 10 causes the process to proceed to S213. In addition, in S209, the same Figure 3 The process is the same as S106, so the detailed description is omitted.

[0088] The controller 10 turns off the first electromagnetic switch 51 , turns on the second electromagnetic switch 52 , and turns off the third electromagnetic switch 53 ( S210 ). That is, the power supply from the vehicle 4 to the load 123 is performed instead of from the system power supply 900 .

[0089] When the SOC is equal to or less than the required value (No in S207 ), that is, when the amount of electric power stored in the vehicle 4 is insufficient to supply power to the outside, the controller 10 determines whether there is a charge command for the vehicle 4 ( S211 ).

[0090] If a charge command is issued (YES in S211 ), controller 10 turns on first electromagnetic switch 51, turns off second electromagnetic switch 52, and turns on third electromagnetic switch 53 ( S212 ). At this point, vehicle 4 is charged using power generated by solar power generator 8 . AC power from system power supply 900 or power generated by solar power generator 8 is supplied to load 123 .

[0091] If there is no charge command (No in S211 ), the controller 10 turns on the first electromagnetic switch 51 , turns off the second electromagnetic switch 52 , and turns off the third electromagnetic switch 53 ( S213 ). At this time, neither power is supplied from the vehicle 4 nor is charging performed.

[0092] Figure 9 This is a flowchart showing a third example of the processing sequence related to the control of the electromagnetic switch. Figure 4 The power supply system 201 shown is described as an example. When a series of processes starts, it is assumed that the first electromagnetic switch 51 is turned on, the second electromagnetic switch 52 is turned off, and the third electromagnetic switch 53 is turned off.

[0093] In S300, the controller 10 determines whether the power supply device 3 and the charging device 6 are connected to the vehicle 4. If the power supply device 3 and the charging device 6 are connected to the vehicle 4 (YES in S300), the controller 10 proceeds to S301. If the power supply device 3 and the charging device 6 are not connected to the vehicle 4 (NO in S300), the controller 10 terminates the process. The process in S300 may be omitted.

[0094] In S301, the controller 10 determines whether there is a power supply instruction. If there is a power supply instruction (YES in S301), the controller 10 advances the process to S302. If there is no power supply instruction (NO in S301), the controller 10 advances the process to S306.

[0095] In S302, the controller 10 obtains information on the electricity charge when the vehicle 4 was last charged, for example, from an energy management server (not shown). Then, in S303, the controller 10 calculates the difference between the current electricity charge and the electricity charge when the vehicle 4 was last charged, the information of which was obtained in S302, and determines whether the difference is greater than a threshold value α. If the difference is greater than the threshold value α (yes in S303), the controller 10 proceeds to S304. If the difference is less than the threshold value α (no in S303), the controller 10 proceeds to S306. In addition, in S303, the same Figure 3 The process is the same as S106, so the detailed description is omitted.

[0096] In S304 , the controller 10 turns off the first electromagnetic switch 51 , turns on the second electromagnetic switch 52 , and turns off the third electromagnetic switch 53 . Then, the controller 10 controls the power supply device 3 to start power supply from the vehicle 4 ( S305 ).

[0097] In S306, the controller 10 determines whether a charging command has been issued. If a charging command has been issued (YES in S306), the controller 10 proceeds to S307, turning on the first electromagnetic switch 51, turning off the second electromagnetic switch 52, and turning on the third electromagnetic switch 53. The controller 10 then controls the charging device 6 to begin charging the vehicle 4 (S308). AC power from the system power supply 900 or power generated by the solar power generation device 8 is supplied to the load 123.

[0098] If neither a power supply command nor a charge command is issued (No in S306), the controller 10 advances the process to S309, turning on the first electromagnetic switch 51, turning off the second electromagnetic switch 52, and turning off the third electromagnetic switch 53. In this case, neither power is supplied from the vehicle 4 nor is charging performed. The load 123 is supplied with AC power from the system power supply 900 or with power generated by the solar power generation device 8.

[0099] In addition, Figure 8 and Figure 9 In FIG. 5 , it is explained whether the third electromagnetic switch 53 is turned on or off. Figure 7 In the system configuration shown in the figure without the third electromagnetic switch 53 , it is understood by those skilled in the art that the same function can be achieved by switching between charging and power supply by the bidirectional power conversion device 9 .

[0100] As described above, in the second embodiment, similar to the first embodiment, the power supply systems 201-204 include the first electromagnetic switch 51 and the second electromagnetic switch 52. This allows power from the vehicle 4 to be supplied to the load with a simple system configuration, simply by adding two electromagnetic switches. Furthermore, in the second embodiment, the power supply systems 201-203 include the third electromagnetic switch 53. This simple system configuration, with the addition of only the third electromagnetic switch, allows charging of the vehicle 4 using power generated by the solar power generation device 8 in addition to power supplied from the vehicle 4.

[0101] While the above embodiment illustrates an example in which a leakage current breaker is included in the power supply system, the present disclosure is not limited thereto. Instead of a leakage current breaker, an overcurrent breaker may be provided that electrically disconnects the system power supply 900 from the circuits PL1 and PL2 in the event of an overcurrent (when an overcurrent is detected), or a leakage current breaker with an overcurrent breaker may be provided that electrically disconnects the system power supply 900 from the circuits PL1 and PL2 in the event of an overcurrent and a leakage (when a leakage is detected).

[0102] In the above embodiment, the power supply device 3 and the bidirectional power conversion device 9 are shown as examples of supplying power to the load 123 connected to the AC 100V circuit PL1. However, the present disclosure is not limited to this. A power supply device or a bidirectional power conversion device may also be provided to supply power from the vehicle 4 to a load connected to the AC 200V circuit PL2. These power supply devices and bidirectional power conversion devices constitute the "power conversion device" in the present disclosure.

[0103] In the above embodiment, an example is shown in which the first electromagnetic switch 51 is electrically connected to the leakage circuit breaker 1 and the overcurrent circuit breaker 113, but the present disclosure is not limited thereto. Figure 10 As shown, it is also possible that the first end of the first electromagnetic switch 51 is electrically connected to the overcurrent circuit breaker 113, and the second end of the first electromagnetic switch 51 is electrically connected to the load 123. In this case, the first end of the second electromagnetic switch 52 is electrically connected to the overcurrent circuit breaker 113 and the load 123. In addition, Figure 10 Shown Figure 1 This is a modification of the power supply system 101, but the power supply systems 102, 201, 202, 203, and 204 can also be modified in the same way.

[0104] The embodiments disclosed herein are to be considered in all respects as illustrative and non-restrictive. The scope of the present disclosure is not indicated by the description of the embodiments described above, but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

Claims

1. A power supply system (101), the power supply system (101) being a power supply system for supplying AC power from a system power supply (900) to a power load (123) of a house (101A), the power supply system (101) comprising: A circuit breaker (1) receives AC power from the system power supply (900) to the house (101A) and cuts off the power in at least one of a leakage and an overcurrent; A load circuit breaker (113) configured to electrically disconnect the current circuit breaker (1) from the power load (123); A power conversion device (3) configured to supply AC power from the vehicle (4) to the power load (123) when the vehicle (4) is connected; a first switch (51) configured to switch electrical connection and disconnection between the current breaker (1) and the load breaker (113); and The second switch (52) is configured to switch between electrical connection and disconnection between the first switch (51) and the power conversion device (3), and to switch between electrical connection and disconnection between the load circuit breaker (113) and the power conversion device (3).

2. The power supply system (101) according to claim 1, wherein: The house (101A) includes a power conditioner (7) that receives power generated by a solar power generation device (8). The power conversion device (3; 6) is configured to charge the vehicle (4) using the AC power from the power conditioner (7) when the vehicle (4) is connected, and The power supply system (101) further includes a third switch (53) configured to switch between electrical connection and disconnection between the power conditioner (7) and the power conversion device (3; 6).

3. The power supply system (101) according to claim 1, wherein: The power conversion device (3; 6) is further configured to charge the vehicle (4) using the AC power from the circuit breaker (1) when the vehicle (4) is connected, and The power supply system (101) further includes a third switch (53) configured to switch between electrical connection and disconnection between the circuit breaker (1) and the power conversion device (3; 6).

4. The power supply system (101) according to any one of claims 1 to 3, wherein: When the vehicle (4) is connected to the power conversion device (3) and the current electricity rate is higher than the electricity rate when the vehicle (4) is charged with the currently charged power, the first switch (51) is opened and the second switch (52) is closed.

5. The power supply system (101) according to claim 4, wherein: When the vehicle (4) is connected to the power conversion device (3) and the current electricity rate is higher than the electricity rate when the vehicle (4) was last charged, the first switch (51) is opened and the second switch (52) is closed.

6. The power supply system (101) according to any one of claims 1 to 3, further comprising a control device (10) for controlling the first switch (51) and the second switch (52), wherein: The control device (10) closes the first switch (51) and opens the second switch (52) when supplying power from the system power supply (900) to the power load (123), and The control device (10) opens the first switch (51) and closes the second switch (52) when power is supplied from the vehicle (4) to the power load (123).

7. The power supply system (101) according to claim 2 or 3, further comprising a control device (10) for controlling the first switch (51), the second switch (52) and the third switch (53), wherein: The control device (10) opens the first switch (51), closes the second switch (52), and opens the third switch (53) when power is supplied from the vehicle (4). When charging the vehicle (4), the control device (10) closes the first switch (51), opens the second switch (52), and closes the third switch (53), and The control device (10) closes the first switch (51), opens the second switch (52), and opens the third switch (53) when neither power is supplied from the vehicle (4) nor charging the vehicle (4).

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