Control method, device and system of alternating current charging and discharging pile discharging system

Abstract

The invention provides a control method, device and system of an alternating current charging and discharging pile discharging system. When a vehicle connected with the alternating current charging and discharging pile needs to be discharged, the vehicle can be discharged outwards in a discharging mode of the alternating current charging and discharging pile. Meanwhile, according to a needed discharging mode, the alternating current charging and discharging pile discharging system can be controlled to transmit vehicle discharging to the power grid interface of the inverter through the alternating current port of the alternating current charging and discharging pile, so that power is supplied to the load through the power supply end of the inverter, and alternating current off-grid discharging of the vehicle to the load is achieved. And the alternating current charging and discharging pile discharging system is controlled to transmit vehicle discharging to the input end of the alternating current-to-direct current power module through the alternating current port of the alternating current charging and discharging pile, so that direct current input is carried out on the inverter through the alternating current-to-direct current power module, power is supplied to a power grid through a power grid interface of the inverter, and grid-connected power supply of the vehicle is achieved. And the vehicle-mounted battery can be better added into household energy management so as to realize more economical, greener and more efficient energy utilization.

Description

Technical Field

[0001] This application relates to the field of power electronics, and more specifically, to a control method, apparatus, and system for an AC charging and discharging pile discharge system. Background Technology

[0002] With the increasing number of electric vehicles and the growing capacity of their batteries, people are paying more and more attention to using electric vehicle batteries as backup power sources for household loads.

[0003] However, currently, electric vehicles with discharge capabilities basically only support AC off-grid discharge to loads and cannot achieve grid-connected power supply, which cannot meet users' grid-connected needs. This greatly limits the scenarios in which vehicle batteries can be integrated into home energy management to achieve more economical, greener, and more efficient energy utilization. Summary of the Invention

[0004] This application provides a control method, device, and system for an AC charging and discharging pile discharge system. The various aspects involved in this application will be described below.

[0005] Firstly, a control method for an AC charging / discharging pile discharge system is provided. The AC charging / discharging pile discharge system includes an AC charging / discharging pile with a discharge mode and a charging mode. The AC charging / discharging pile includes an AC port for connecting to a vehicle. The AC port is connected to both the grid interface of an inverter and the input terminal of an AC-to-DC power module. The grid interface of the inverter is also connected to the power grid. The output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter. The power supply terminal of the inverter is connected to a load. The method includes: when a vehicle needs to discharge through the connected AC charging / discharging pile, switching the AC charging / discharging pile to discharge mode; after the vehicle starts discharging, controlling the AC charging / discharging pile to transmit the vehicle discharge through the AC port to the grid interface of the inverter, according to the required discharge method, to supply power to the load through the power supply terminal of the inverter; or, controlling the AC charging / discharging pile to transmit the vehicle discharge through the AC port to the input terminal of the AC-to-DC power module, to provide DC input to the inverter through the AC-to-DC power module, and to supply power to the grid through the grid interface of the inverter.

[0006] In one possible implementation, controlling the AC charging / discharging pile to discharge the vehicle through the AC port to transmit the discharge to the inverter's grid interface, so as to supply power to the load through the inverter's power supply terminal, includes: controlling the connection between the inverter's grid interface and the grid to be disconnected; controlling the connection between the AC port and the input terminal of the AC-to-DC power module to be disconnected; and controlling the connection between the AC port and the inverter's grid interface to be connected, so as to supply power to the load through the inverter's power supply terminal.

[0007] In one possible implementation, the AC charging / discharging pile discharges the vehicle's power through an AC port to the input of an AC-to-DC power module, which then supplies DC power to the inverter. The inverter's grid interface supplies power to the grid. This includes: disconnecting the connection between the AC port and the inverter's grid interface; connecting the AC port to the input of the AC-to-DC power module to supply DC power to the inverter; and connecting the inverter's grid interface to the grid, allowing the inverter to supply power to the grid through the grid interface.

[0008] In one possible implementation, DC input to the inverter via the AC-to-DC power module includes: sending a discharge request and discharge parameters to the inverter so that the inverter allows the AC-to-DC power module to input DC to the inverter according to the discharge request and discharge parameters.

[0009] In one possible implementation, the AC charging and discharging pile discharge system further includes a DC power supply connected to the DC input terminal of the inverter. After the inverter allows the AC-to-DC power module to provide DC input to the inverter according to the discharge application and discharge parameters, the method further includes: controlling the connection between the DC power supply and the DC input terminal of the inverter to be disconnected.

[0010] In one possible implementation, the method further includes: monitoring whether the AC charging and discharging pile discharge system is abnormal when the vehicle is discharging through the AC charging and discharging pile discharge system; stopping the vehicle from discharging through the AC charging and discharging pile discharge system when the discharge is abnormal; and switching the AC charging and discharging pile to charging mode.

[0011] Secondly, a control device for an AC charging / discharging pile discharge system is provided. The AC charging / discharging pile discharge system includes an AC charging / discharging pile with a discharge mode and a charging mode. The AC charging / discharging pile includes an AC port for connecting to a vehicle. The AC port is connected to the grid interface of an inverter and the input terminal of an AC-to-DC power module. The grid interface of the inverter is also connected to the power grid. The output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter. The power supply terminal of the inverter is connected to the load. The device includes: a switching module for switching the AC charging / discharging pile to discharge mode when the vehicle needs to discharge through the connected AC charging / discharging pile; and a discharge module for controlling the AC charging / discharging pile to transmit the vehicle discharge through the AC port to the grid interface of the inverter, so as to supply power to the load through the power supply terminal of the inverter, or controlling the AC charging / discharging pile to transmit the vehicle discharge through the AC port to the input terminal of the AC-to-DC power module, so as to provide DC input to the inverter through the AC-to-DC power module, and supply power to the grid through the grid interface of the inverter.

[0012] In one possible implementation, the discharge module is specifically used to control the disconnection of the inverter's grid interface and the grid; to control the disconnection of the connection between the AC port and the input terminal of the AC-to-DC power module; and to control the connection between the AC port and the inverter's grid interface to supply power to the load through the inverter's power supply terminal.

[0013] In one possible implementation, the discharge module is specifically used to disconnect the connection between the AC port and the inverter's grid interface; to connect the connection between the AC port and the input terminal of the AC-to-DC power module so as to provide DC input to the inverter through the AC-to-DC power module; and to connect the connection between the inverter's grid interface and the grid so that the inverter supplies power to the grid through the grid interface.

[0014] In one possible implementation, the discharge module is specifically used to send a discharge request and discharge parameters to the inverter, so that the inverter allows the AC-to-DC power module to provide DC input to the inverter according to the discharge request and discharge parameters.

[0015] In one possible implementation, the AC charging and discharging pile discharge system also includes a DC power supply connected to the DC input terminal of the inverter, a discharge module, and is also used to control the disconnection between the DC power supply and the DC input terminal of the inverter.

[0016] In one possible implementation, the discharge module is further configured to monitor whether the AC charging and discharging pile discharge system is abnormal when the vehicle is discharging through the AC charging and discharging pile discharge system; if the discharge is abnormal, stop the vehicle from discharging through the AC charging and discharging pile discharge system; and switch the AC charging and discharging pile to charging mode.

[0017] Thirdly, an AC charging and discharging pile discharge system is provided, comprising: an AC charging and discharging pile having a discharge mode and a charging mode, the AC charging and discharging pile including an AC port for connecting to a vehicle, the AC port being connected to the grid interface of an inverter and the input terminal of an AC-to-DC power module respectively, the grid interface of the inverter being connected to the power grid, the output terminal of the AC-to-DC power module being connected to the DC input terminal of the inverter, the power supply terminal of the inverter being connected to a load, and further comprising a controller for performing the method as described in the first aspect or any possible implementation thereof.

[0018] In one possible implementation, the AC-to-DC power module is installed inside the AC charging and discharging station, which includes an AC output terminal and a DC output terminal. The AC port is connected to the grid interface of the inverter through the AC output terminal, and the output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter through the DC output terminal.

[0019] In one possible implementation, the AC-to-DC power module is located outside the AC charging and discharging station. The AC charging and discharging station includes an AC output terminal, and the AC port is connected to the grid interface of the inverter and the input terminal of the AC-to-DC power module through the AC output terminal.

[0020] Fourthly, a computer-readable storage medium having program code stored thereon, the program code being used by a controller of an AC charging and discharging pile discharge system to perform the method as described in the first aspect or any possible implementation thereof.

[0021] In this embodiment, an AC charging / discharging pile with both discharge and charging modes is used as the AC port for connecting to the vehicle. This port is connected to the inverter's grid interface and the input terminal of the AC-to-DC power module, respectively. The inverter's grid interface is connected to the power grid, the output terminal of the AC-to-DC power module is connected to the inverter's DC input terminal, and the inverter's power supply terminal is connected to the load, thus forming an AC charging / discharging pile discharge system. This system allows the vehicle connected to the AC charging / discharging pile to discharge externally using the charging / discharging pile's discharge mode when needed. Simultaneously, based on this system, the vehicle can discharge through the AC port of the AC charging / discharging pile to the inverter's grid interface, supplying power to the load through the inverter's power supply terminal, achieving off-grid AC discharge from the vehicle to the load. Furthermore, the vehicle can discharge through the AC port of the AC charging / discharging pile to the input terminal of the AC-to-DC power module, providing DC input to the inverter through the AC-to-DC power module, and supplying power to the grid through the inverter's grid interface, achieving grid-connected power supply for the vehicle. This allows vehicle batteries to be better integrated into home energy management for more economical, greener, and more efficient energy use. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an AC charging and discharging pile provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of an AC charging and discharging pile discharge system provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of another AC charging and discharging pile provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of another AC charging and discharging pile discharge system provided in an embodiment of this application;

[0027] Figure 5 This is a flowchart illustrating a control method for an AC charging and discharging pile discharge system provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of a control device for an AC charging and discharging pile discharge system provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0030] With the increasing number of electric vehicles and the growing capacity of their batteries, people are paying more and more attention to using electric vehicle batteries as backup power sources for household loads.

[0031] However, currently, electric vehicles with discharge capabilities basically only support AC off-grid discharge to loads and cannot achieve grid-connected power supply, which cannot meet users' grid-connected needs. This greatly limits the scenarios in which vehicle batteries can be integrated into home energy management to achieve more economical, greener, and more efficient energy utilization.

[0032] Therefore, to address the aforementioned problems, this application provides a control method for an AC charging / discharging pile discharge system. Based on this control method, the AC charging / discharging pile discharge system enables vehicles connected to the AC charging / discharging pile to discharge externally via the charging / discharging pile's discharge mode when needed. Simultaneously, according to the required discharge method, the system can control the AC charging / discharging pile discharge system to transmit vehicle discharge through the AC port of the AC charging / discharging pile to the inverter's grid interface, thereby supplying power to the load through the inverter's power supply terminal, achieving off-grid AC discharge from the vehicle to the load. Furthermore, the system can control the AC charging / discharging pile discharge system to transmit vehicle discharge through the AC port of the AC charging / discharging pile to the input terminal of an AC-to-DC power module, thereby providing DC input to the inverter through the AC-to-DC power module, and supplying power to the grid through the inverter's grid interface, achieving grid-connected power supply for the vehicle. This allows the vehicle battery to be better integrated into home energy management for more economical, greener, and more efficient energy utilization.

[0033] In this application, the control method for the AC charging and discharging pile discharge system described above can be applied to a corresponding AC charging and discharging pile discharge system. For example, this application provides an AC charging and discharging pile discharge system. This AC charging and discharging pile discharge system may include an AC charging and discharging pile with a discharge mode and a charging mode. The AC port of the AC charging and discharging pile for connecting to a vehicle can be connected to the grid interface of an inverter and the input terminal of an AC-to-DC power module, respectively. The grid interface of the inverter can also be connected to the power grid. The output terminal of the AC-to-DC power module can be connected to the DC input terminal of the inverter, and the power supply terminal of the inverter can be connected to the load. Corresponding switches (such as relays, changeover switches, etc.) can be set in each circuit connection as needed to control the conduction and disconnection of the corresponding circuit connection lines, thereby achieving corresponding circuit control. The AC charging and discharging pile discharge system may also include a controller. The controller can communicate with various switches, inverters, AC-to-DC power modules, and other devices as needed (e.g., via a Controller Area Network (CAN) or RS485 communication protocol), thereby executing the control method for the AC charging and discharging pile discharge system provided in this embodiment. This controller can reuse the controller of the AC charging and discharging pile (e.g., the AC charging and discharging control circuit) or can be a separately configured controller; no limitation is made here.

[0034] As an example, the AC-to-DC power module in this AC charging and discharging pile system can be installed inside the AC charging and discharging pile to form an integrated AC charging and discharging pile capable of DC output. That is, based on the aforementioned AC charging and discharging pile system, the AC-to-DC power module is installed inside the AC charging and discharging pile, which includes an AC output terminal and a DC output terminal. The AC port is connected to the grid interface of the inverter through the AC output terminal, and the output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter through the DC output terminal.

[0035] For example, such as Figure 1As shown, an integrated AC charging / discharging station may include a controller, an AC-to-DC power module, an AC output terminal, a DC output terminal, and AC ports (such as the live wire (L) port and the neutral wire (N) port), a Control Pilot (CP) port, a Proximity Pilot (PP) port, and a Protective Earth (PE) port for connection to a vehicle. The AC port can be connected to the AC output terminal via a switch, or it can be connected to the input terminal of the AC-to-DC power module via another switch. The output terminal of the AC-to-DC power module can be directly used as the DC output terminal of the AC charging / discharging station. Alternatively, the AC charging / discharging station can have its own independent DC output terminal connected to the output terminal of the AC-to-DC power module. The controller can be connected to each switch, the AC-to-DC power module, the AC port, the CP port, the PP port, and the PE port. Therefore, this integrated AC charging / discharging station can control the corresponding switches to turn on or off to output DC power through the DC output terminal or AC power through the AC output terminal.

[0036] For example, based on this integrated AC charging and discharging pile, then as follows: Figure 2 As shown, in the corresponding AC charging and discharging pile discharge system, the AC ports (such as the live wire L port and the neutral wire N port), CP port, PP port, and PE port of the integrated AC charging and discharging pile can be connected to the corresponding ports of the vehicle (i.e., electric vehicle) via a charging cable. The AC output terminal (AC (Alternating Current) terminal) of the integrated AC charging and discharging pile can be connected to the power grid via AC contactor K1, and can also be connected to the inverter's grid interface (GRID). Correspondingly, the inverter's grid interface is also connected to the power grid via AC contactor K1. The DC output terminal (DC (Direct Current) terminal) of the integrated AC charging and discharging pile can be connected to the inverter's DC input terminal (BAT). Of course, this DC input terminal can also be connected to a corresponding energy storage battery, photovoltaic system, or other DC power supply. The inverter's power supply terminal (Emergency Power Supply, EPS) can be connected to the load (LOAD). Therefore, based on the control method of this application, the corresponding discharge mode can be achieved by controlling the AC contactor K1 to open or close and by controlling the integrated AC charging and discharging pile to output AC or DC power. Among them, the auxiliary power supply of the integrated AC charging and discharging pile can be connected to a backup power supply so that when the power grid is out of power, the auxiliary power supply of the integrated AC charging and discharging pile can be provided through the backup power supply.

[0037] As another example, the AC-to-DC power module in the AC charging and discharging pile discharge system provided in this application embodiment can be set up independently. That is, based on the aforementioned AC charging and discharging pile discharge system, the AC-to-DC power module is set up independently outside the AC charging and discharging pile. The AC charging and discharging pile includes an AC output terminal, and the AC port is connected to the grid interface of the inverter and the input terminal of the AC-to-DC power module through the AC output terminal.

[0038] For example, such as Figure 3 As shown, an AC charging / discharging station may include a controller, an AC output terminal, and AC ports (such as the live wire (L) port and the neutral wire (N) port), a Control Pilot (CP) port, a Proximity Pilot (PP) port, and a Protective Earth (PE) port for connection to a vehicle. The AC ports can be connected to the AC output terminal via switches. The controller can be connected to the switches, AC ports, CP ports, PP ports, and PE ports respectively. Therefore, the AC charging / discharging station can control the AC output terminal to output AC power by controlling the corresponding switches to turn them on or off via the controller.

[0039] For example, based on this AC charging and discharging station, then as follows: Figure 4As shown, in the corresponding AC charging and discharging pile discharge system, the AC ports (such as the live wire L port and the neutral wire N port), CP port, PP port, and PE port of the AC charging and discharging pile can be connected to the corresponding ports of the vehicle (i.e., electric vehicle) via a charging cable. The AC output terminal (AC (Alternating Current) terminal) of the AC charging and discharging pile can be connected to the power grid via switch K2 and AC contactor K1. It can also be connected to the inverter's grid interface (GRID) via switch K2, and correspondingly, the inverter's grid interface is connected to the power grid via AC contactor K1. The AC output terminal (AC (Alternating Current) terminal) of the AC charging and discharging pile can also be connected to the input terminal of the AC-to-DC power module via switch K2. The output terminal (DC (Direct Current) terminal) of the AC-to-DC power module can be connected to the inverter's DC input terminal (BAT). This DC input terminal can also be connected to a corresponding energy storage battery, photovoltaic system, or other DC power source. The inverter's power supply terminal (Emergency Power Supply, EPS) can be connected to the load (LOAD). Therefore, based on the control method of this application, the corresponding discharge mode can be achieved by controlling the AC contactor K1 to disconnect or connect the control system to the power grid, and by switching the AC output and DC output through the switch K2. The auxiliary power supply of the AC charging / discharging pile can be connected to a backup power supply so that the backup power supply can provide auxiliary power to the AC charging / discharging pile when the power grid is unavailable.

[0040] Of course, the above is only an exemplary description of the components included in the AC charging and discharging pile discharge system. In the embodiments of this application, the system may also include other necessary components involved in related technologies, which will not be elaborated here.

[0041] The control method of the AC charging and discharging pile discharge system provided in this application will be described below with reference to the accompanying drawings.

[0042] like Figure 5 As shown in the embodiments of this application, a control method for an AC charging and discharging pile discharge system may include the following S501-S502.

[0043] S501. When the vehicle needs to discharge through the connected AC charging / discharging station, switch the AC charging / discharging station to discharge mode.

[0044] In some possible implementations, the AC charging and discharging station can be configured to be in charging mode by default, that is, the AC charging and discharging station is in charging mode when it is in standby plug-in state. Therefore, if the vehicle needs to discharge through the connected AC charging and discharging station when the AC charging and discharging station is in standby plug-in state or charging, the AC charging and discharging station can be switched to discharging mode so that the vehicle can discharge through the AC charging and discharging station.

[0045] For example, a user can use a mobile application to set the vehicle to discharge, sending a discharge command to the controller. Upon receiving this command, the controller executes step S501. Alternatively, in other possible implementations, the vehicle can be instructed to discharge via a connected AC charging / discharging station. For instance, a control panel and corresponding control program can be provided for the AC charging / discharging station, allowing the user to instruct the vehicle to discharge via the station. The controller then executes step S501 when the user instructs the vehicle to discharge via the AC charging / discharging station.

[0046] It should be noted that in practical applications, AC charging and discharging piles can be powered by the grid as an auxiliary power source. When the grid is out of power, the AC charging and discharging piles can be powered by the backup battery until the vehicle starts discharging and outputs AC power to the AC charging and discharging piles, and then the vehicle discharges to provide auxiliary power to the AC charging and discharging piles.

[0047] S502. After the vehicle starts discharging, depending on the required discharge method, control the AC charging and discharging pile to transmit the vehicle discharge through the AC port to the inverter's grid interface, so as to supply power to the load through the inverter's power supply terminal; or, control the AC charging and discharging pile to transmit the vehicle discharge through the AC port to the input terminal of the AC-to-DC power module, so as to provide DC input to the inverter through the AC-to-DC power module, and supply power to the grid through the inverter's grid interface.

[0048] That is, after the vehicle starts discharging, the AC charging and discharging pile discharge system can be controlled to supply power to the load or to the power grid based on the vehicle discharge, according to the discharge method required by the user.

[0049] The user's desired discharge mode can be set by the user through a mobile terminal application. The user sends an instruction to the controller of the AC charging and discharging pile discharge system for the corresponding discharge mode (such as an instruction to supply power to the load or an instruction to supply power to the grid). When the controller receives the corresponding instruction, it can control the AC charging and discharging pile discharge system to supply power to the load or to the grid according to the corresponding instruction.

[0050] For example, the specific method for controlling the AC charging / discharging pile to discharge vehicle power through the AC port to transmit it to the inverter's grid interface, and then supplying power to the load through the inverter's power supply terminal, can be as follows: First, disconnect the connection between the inverter's grid interface and the grid, thus disconnecting the connection between the grid and the AC charging / discharging pile's discharge system. Then, disconnect the connection between the AC port of the AC charging / discharging pile and the input terminal of the AC-to-DC power module, and connect the AC port to the inverter's grid interface, allowing the vehicle's discharge to be output AC through the AC port of the AC charging / discharging pile to the inverter's grid interface. Therefore, power can be supplied to the load through the inverter's power supply terminal.

[0051] For example, as Figure 2 Taking the AC charging and discharging pile discharge system shown as an example, the AC contactor K1 can be disconnected first, and then the integrated AC charging and discharging pile can be controlled to output AC power to the grid interface of the inverter through the AC output port, thereby supplying power to the load through the power supply terminal of the inverter.

[0052] For example, as in Figure 4 Taking the AC charging / discharging pile discharge system shown as an example, the AC contactor K1 can be disconnected first, and then the switching switch K2 can be controlled to disconnect the connection between the AC output terminal of the AC charging / discharging pile and the input terminal of the AC-to-DC power module, and connect the connection between the AC output terminal and the grid interface of the inverter. This allows the vehicle to discharge AC power through the AC output terminal of the AC charging / discharging pile to the grid interface of the inverter. Thus, power can be supplied to the load through the power supply terminal of the inverter.

[0053] In some possible implementations, the inverter in the AC charging and discharging pile discharge system can also be connected to multiple DC power sources, such as energy storage batteries and photovoltaic systems, through multiple DC input terminals. In this case, when the AC charging and discharging pile discharge system supplies power to the load through the inverter's power supply terminal, the inverter can be controlled to simultaneously supply power to the load from the vehicle and other DC power sources connected to the inverter, such as energy storage batteries and photovoltaic systems. Alternatively, power can be supplied to the load first from the photovoltaic system, then from the energy storage battery when the photovoltaic system's power supply is insufficient, and finally from the vehicle when the energy storage battery's discharge current is too high or its remaining charge is insufficient.

[0054] For example, the specific method for controlling the AC charging / discharging pile to discharge the vehicle's power through its AC port to the input terminal of the AC-to-DC power module, so that the AC-to-DC power module can provide DC input to the inverter and supply power to the grid through the inverter's grid interface, can be as follows: First, disconnect the connection between the AC port of the AC charging / discharging pile and the grid interface of the inverter. Then, reconnect the connection between the AC port of the AC charging / discharging pile and the input terminal of the AC-to-DC power module, and reconnect the connection between the grid interface of the inverter and the grid. This allows the vehicle's power discharge to be supplied to the inverter's DC input terminal through the AC port of the AC charging / discharging pile via the AC-to-DC power module, so that the inverter can supply power to the grid through the grid interface.

[0055] For example, as Figure 2 Taking the AC charging and discharging pile discharge system shown as an example, the integrated AC charging and discharging pile can first be controlled to output vehicle discharge from the DC output terminal to the DC input terminal of the inverter through the internal AC-to-DC power module. Then, the AC contactor K1 is controlled to conduct, so that the inverter supplies power to the grid through the grid interface.

[0056] For example, as in Figure 4 Taking the AC charging and discharging pile discharge system shown as an example, the connection between the AC output terminal of the AC charging and discharging pile and the grid interface of the inverter can be disconnected by switching switch K2, while the connection between the AC output terminal and the input terminal of the AC-to-DC power module can be connected, so that the vehicle discharge can be supplied with DC power by the AC-to-DC power module to the inverter. Then, the AC contactor K1 is turned on to control the inverter to supply power to the grid through the grid interface.

[0057] In some possible implementations, providing DC input to the inverter via the AC-to-DC power module may include sending a discharge request and discharge parameters to the inverter. This allows the inverter to determine whether to allow the AC-to-DC power module to provide DC input based on the request and parameters, so that, when permitted, power can be supplied to the grid via the grid interface based on the discharge parameters. The discharge parameters may include information such as the maximum discharge power of the AC charging / discharging pile. For example, an AC charging / discharging pile is used as an example... Figure 1 Taking the integrated AC charging and discharging pile as an example, a discharge request and discharge parameters can be sent to the inverter through a controller (such as the controller of the integrated AC charging and discharging pile). Taking the AC charging and discharging pile as an example... Figure 3 Taking the AC charging and discharging pile as an example, the controller (such as the controller of the AC charging and discharging pile) can first send the discharge parameters to the AC to DC power module, and then send the discharge application and discharge parameters to the inverter through the AC to DC power module.

[0058] Optionally, in some possible implementations, the DC input terminal of the inverter in the AC charging / discharging pile discharge system may also be connected to other DC power sources, such as energy storage batteries or photovoltaic systems. Therefore, after the vehicle discharges through the AC charging / discharging pile system, and the inverter allows the AC-to-DC power module to input DC power, the connection between the inverter's DC input terminal and other DC power sources can be disconnected to allow power to be supplied to the grid solely through the vehicle. Thus, after the vehicle stops discharging through the AC charging / discharging pile system, the connection between other DC power sources and the inverter's DC input terminal is restored to allow these other DC power sources to operate through the inverter. Of course, in some other possible implementations, the AC charging / discharging pile discharge system may also maintain the connection between the inverter's DC input terminal and other DC power sources to simultaneously or according to priority supply to the grid via energy storage batteries, photovoltaic systems, and the vehicle; this is not a limitation.

[0059] In this embodiment, the system can also be monitored for abnormal discharge when the vehicle is discharging through the AC charging / discharging station system. For example, abnormal discharge can be monitored by checking the vehicle's discharge power and the functions of various components within the AC charging / discharging station system. Therefore, if an abnormal discharge occurs, the vehicle's discharge through the AC charging / discharging station system can be stopped, and the AC charging / discharging station can be switched to charging mode to enter standby mode.

[0060] The control method for the AC charging / discharging pile discharge system provided in this application embodiment enables the vehicle to discharge externally via the AC charging / discharging pile's discharge mode when a vehicle connected to the AC charging / discharging pile needs to discharge. Simultaneously, based on the required discharge method, the system can control the AC charging / discharging pile discharge system to transmit the vehicle's discharge through the AC port of the AC charging / discharging pile to the inverter's grid interface, thereby supplying power to the load through the inverter's power supply terminal, achieving off-grid AC discharge from the vehicle to the load. Furthermore, the system can control the AC charging / discharging pile discharge system to transmit the vehicle's discharge through the AC port of the AC charging / discharging pile to the input terminal of the AC-to-DC power module, thereby providing DC input to the inverter through the AC-to-DC power module, and supplying power to the grid through the inverter's grid interface, achieving grid-connected power supply for the vehicle. This allows the vehicle battery to be better integrated into home energy management for more economical, greener, and more efficient energy utilization.

[0061] The method embodiments of this application have been described in detail above with reference to the accompanying drawings. The apparatus embodiments of this application will now be described in detail. It should be understood that the descriptions of the apparatus embodiments correspond to the descriptions of the method embodiments; therefore, any parts not described in detail can be referred to the foregoing method embodiments.

[0062] This application also provides a control device for an AC charging / discharging pile discharge system. The AC charging / discharging pile discharge system includes an AC charging / discharging pile with a discharge mode and a charging mode. The AC charging / discharging pile includes an AC port for connecting to a vehicle. The AC port is connected to both the inverter's grid interface and the input terminal of an AC-to-DC power module. The inverter's grid interface is also connected to the power grid. The output terminal of the AC-to-DC power module is connected to the inverter's DC input terminal. The inverter's power supply terminal is connected to the load. (Refer to...) Figure 6 As shown, the device includes: a switching module 601, used to switch the AC charging / discharging pile to discharge mode when the vehicle needs to discharge through the connected AC charging / discharging pile; and a discharge module 602, used to, after the vehicle starts discharging, control the AC charging / discharging pile to transmit the vehicle discharge through the AC port to the inverter's grid interface according to the required discharge method, so as to supply power to the load through the inverter's power supply terminal, or control the AC charging / discharging pile to transmit the vehicle discharge through the AC port to the input terminal of the AC-to-DC power module, so as to provide DC input to the inverter through the AC-to-DC power module, and supply power to the grid through the inverter's grid interface.

[0063] In one possible implementation, the discharge module 602 is specifically used to control the disconnection of the inverter's grid interface and the grid; control the disconnection of the connection between the AC port and the input terminal of the AC-to-DC power module; and control the connection between the AC port and the inverter's grid interface to supply power to the load through the inverter's power supply terminal.

[0064] In one possible implementation, the discharge module 602 is specifically used to control the disconnection between the AC port and the grid interface of the inverter; control the connection between the AC port and the input terminal of the AC-to-DC power module to enable DC input to the inverter through the AC-to-DC power module; and control the connection between the grid interface of the inverter and the grid to enable the inverter to supply power to the grid through the grid interface.

[0065] In one possible implementation, the discharge module 602 is specifically used to send a discharge request and discharge parameters to the inverter so that the inverter allows the AC-to-DC power module to provide DC input to the inverter according to the discharge request and discharge parameters.

[0066] In one possible implementation, the AC charging and discharging pile discharge system also includes a DC power supply connected to the DC input terminal of the inverter, and a discharge module 602, which is also used to control the disconnection between the DC power supply and the DC input terminal of the inverter.

[0067] In one possible implementation, the discharge module 602 is further configured to monitor whether the AC charging and discharging pile discharge system is abnormal when the vehicle is discharging through the AC charging and discharging pile discharge system; if the discharge is abnormal, stop the vehicle from discharging through the AC charging and discharging pile discharge system; and switch the AC charging and discharging pile to charging mode.

[0068] This application embodiment also provides an AC charging and discharging pile discharge system, including: an AC charging and discharging pile having a discharge mode and a charging mode, the AC charging and discharging pile including an AC port for connecting to a vehicle, the AC port being connected to the grid interface of an inverter and the input terminal of an AC-to-DC power module respectively, the grid interface of the inverter being connected to the power grid, the output terminal of the AC-to-DC power module being connected to the DC input terminal of the inverter, the power supply terminal of the inverter being connected to the load, and further including a controller, the controller being used to execute the method described in any embodiment.

[0069] In one possible implementation, the AC-to-DC power module is installed inside the AC charging and discharging station, which includes an AC output terminal and a DC output terminal. The AC port is connected to the grid interface of the inverter through the AC output terminal, and the output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter through the DC output terminal.

[0070] In one possible implementation, the AC-to-DC power module is located outside the AC charging and discharging station. The AC charging and discharging station includes an AC output terminal, and the AC port is connected to the grid interface of the inverter and the input terminal of the AC-to-DC power module through the AC output terminal.

[0071] This application also provides a computer-readable storage medium storing program code thereon, the program code being used by the controller of the AC charging and discharging pile discharge system to execute the method described in any of the preceding embodiments.

[0072] It should be understood that, in the embodiments of this application, determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0073] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0074] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0075] It should be understood that, in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0076] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0077] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0078] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0079] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs) etc.

[0080] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for an AC charging and discharging pile discharge system, characterized in that, The AC charging and discharging pile discharge system includes an AC charging and discharging pile with a discharge mode and a charging mode. The AC charging and discharging pile includes an AC port for connecting to a vehicle. The AC port is connected to both the grid interface of an inverter and the input terminal of an AC-to-DC power module. The grid interface of the inverter is also connected to the power grid. The output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter. The power supply terminal of the inverter is connected to a load. The method includes: When the vehicle needs to discharge through the connected AC charging and discharging station, switch the AC charging and discharging station to discharge mode. After the vehicle starts discharging, according to the required discharge method, the AC charging / discharging pile is controlled to transmit the vehicle's discharge through the AC port to the inverter's grid interface, so as to supply power to the load through the inverter's power supply terminal, or... The AC charging and discharging pile controls the vehicle to discharge through the AC port to the input terminal of the AC-to-DC power module, so that the AC-to-DC power module can provide DC input to the inverter, and the inverter can supply power to the grid through the grid interface.

2. The method according to claim 1, characterized in that, The control of the AC charging / discharging pile to discharge the vehicle through the AC port and transmit the discharge to the grid interface of the inverter, so as to supply power to the load through the power supply terminal of the inverter, includes: The connection between the inverter's grid interface and the power grid is disconnected. Disconnect the connection between the AC port and the input terminal of the AC-to-DC power module; The connection between the AC port and the grid interface of the inverter is made active to supply power to the load through the power supply terminal of the inverter.

3. The method according to claim 1, characterized in that, The control of the AC charging and discharging pile to discharge the vehicle through the AC port to the input terminal of the AC-to-DC power module, so as to provide DC input to the inverter through the AC-to-DC power module, and to supply power to the grid through the grid interface of the inverter, includes: Disconnect the AC port from the grid interface of the inverter; The connection between the AC port and the input terminal of the AC-to-DC power module is made active so that DC input is provided to the inverter through the AC-to-DC power module; The inverter controls the connection between its grid interface and the grid, and the inverter supplies power to the grid through the grid interface.

4. The method according to claim 3, characterized in that, The step of providing DC input to the inverter through the AC-to-DC power module includes: Send a discharge request and discharge parameters to the inverter so that the inverter allows the AC-to-DC power module to provide DC input to the inverter according to the discharge request and the discharge parameters.

5. The method according to claim 4, characterized in that, The AC charging and discharging pile discharge system also includes a DC power supply connected to the DC input terminal of the inverter. After the inverter allows the AC-to-DC power module to provide DC input to the inverter according to the discharge request and the discharge parameters, the method further includes: Disconnect the connection between the DC power supply and the DC input terminal of the inverter.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: When the vehicle discharges through the AC charging and discharging pile discharge system, monitor whether the AC charging and discharging pile discharge system is abnormal in discharge. In the event of an abnormal discharge, the vehicle shall be stopped from discharging through the AC charging and discharging pile discharge system. Switch the AC charging / discharging station to charging mode.

7. A control device for an AC charging and discharging pile discharge system, characterized in that, The AC charging and discharging pile system includes an AC charging and discharging pile with a discharging mode and a charging mode. The AC charging and discharging pile includes an AC port for connecting to a vehicle. The AC port is connected to both the inverter's grid interface and the input terminal of the AC-to-DC power module. The inverter's grid interface is also connected to the power grid. The output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter. The inverter's power supply terminal is connected to the load. The device includes: The switching module is used to switch the AC charging and discharging pile to the discharge mode when the vehicle needs to discharge through the connected AC charging and discharging pile. The discharge module is used to, after the vehicle starts discharging, control the AC charging and discharging pile to discharge the vehicle through the AC port to transmit the discharge to the grid interface of the inverter, so as to supply power to the load through the power supply terminal of the inverter, or control the AC charging and discharging pile to discharge the vehicle through the AC port to transmit the discharge to the input terminal of the AC to DC power module, so as to provide DC input to the inverter through the AC to DC power module, and supply power to the grid through the grid interface of the inverter.

8. An AC charging and discharging pile discharge system, characterized in that, include: An AC charging / discharging pile with a discharge mode and a charging mode, the AC charging / discharging pile includes an AC port for connecting to a vehicle, the AC port being connected to the grid interface of an inverter and the input terminal of an AC-to-DC power module, the grid interface of the inverter being connected to the power grid, the output terminal of the AC-to-DC power module being connected to the DC input terminal of the inverter, the power supply terminal of the inverter being connected to a load, and a controller for executing the method as described in any one of claims 1 to 6.

9. The AC charging and discharging pile discharge system according to claim 8, characterized in that, The AC-to-DC power module is installed inside the AC charging and discharging station. The AC charging and discharging station includes an AC output terminal and a DC output terminal. The AC port is connected to the grid interface of the inverter through the AC output terminal, and the output terminal of the AC-to-DC power module is connected to the DC input terminal of the inverter through the DC output terminal.

10. The AC charging and discharging pile discharge system according to claim 8, characterized in that, The AC-to-DC power module is located outside the AC charging and discharging station. The AC charging and discharging station includes an AC output terminal, and the AC port is connected to the grid interface of the inverter and the input terminal of the AC-to-DC power module through the AC output terminal.

11. A computer-readable storage medium, characterized in that, It stores program code, which is used by the controller of the AC charging and discharging pile discharge system to execute the method as described in any one of claims 1 to 6.

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