Charging and discharging method of direct-current charging and discharging motor and direct-current charging and discharging motor

Abstract

The invention relates to a charging and discharging method of a direct-current charging and discharging motor and the direct-current charging and discharging motor. The output power of a power module of a working part is controlled according to a dispatching instruction; a power supply module of the hot standby part is in a starting state and works in a hot standby mode; after an instruction of switching the current direction is received, the power supply module of the previous working part is in a starting state, works in a hot standby mode and is changed into the power supply module of the hot standby part; the power supply module of the previous hot standby part outputs power in the direction opposite to the direction of the power supply module of the previous working part according to the dispatching instruction and changes the power into the power supply module of the working part, and different state modes are set for the power supply module of the working part and the power supply module of the hot standby part; switching between charging and discharging of the electric vehicle is completed according to the regulation and control instruction, the operation of turning off a power module is not needed, the switching speed is high, operation is convenient, and therefore vehicle-network interaction is efficiently carried out.

Description

Technical Field

[0001] The invention relates to a charging and discharging method of a direct current charger and a direct current charger, and belongs to the field of chargers and dischargers. Background Art

[0002] With the development of electric vehicles and the improvement of standards, more and more electric vehicles support discharge functions, which will prompt electric vehicles to participate in vehicle-grid interaction on a large scale and become an important path for the development of virtual power plants in the future. The rapid switching of charging and discharging of electric vehicles will help to quickly respond to the grid's dispatch needs and enable electric vehicles to better participate in vehicle-grid interaction.

[0003] The key equipment in vehicle-grid interaction is the charger and discharger. The published text of the patent application with application publication number CN103354381A discloses an electric vehicle charger and discharger, in which the power conversion system can complete the mutual conversion between AC and DC. The control system in the charger and discharger completes the charging of the electric vehicle and the discharging of the power battery and grid connection through communication interaction with the human-machine interface and the remote terminal. Specifically: after the charging and discharging plug is connected to the power battery, the charging operation starts (after starting the charger and discharger to set the charging parameters, the display screen will have a charging mode prompt, and select automatic charging from the fixed power, fixed time, automatic full charge and other modes). The appropriate mode; click OK to start the device to start charging; the charging and discharging plugs can be disconnected after charging is completed; if you want to terminate charging in the middle, you need to terminate charging manually or send a termination charge command from the monitoring background or remote end, and the charging and discharging plugs can be disconnected after charging is terminated); after the charging and discharging plugs are connected to the power battery, the discharge operation starts (start the charger and discharge machine, set the discharge parameters, and the charger and discharge machine sends a discharge request; the monitoring background or remote terminal sends a discharge or grid connection instruction to the charger and discharge machine according to the power grid situation; the charger and discharge machine automatically discharges or connects to the grid according to the instructions of the monitoring background or remote terminal; after the discharge stops, other operations can be performed). Obviously, every time the charger and discharge machine switches between charging and discharging, it is not only troublesome to operate and unable to realize the intelligent charging and discharging state, but also leads to a longer charging and discharging state conversion time, which is not conducive to the development of vehicle-grid interaction.

[0004] At the same time, in the existing electric vehicle charging and discharging machines, multiple power modules are used in parallel to achieve high-power output. When switching between charging and discharging, due to the characteristics of the power module, the power module needs to be turned off and then turned on. There are obvious breakpoints in its power transmission, and the overall switching speed is slow, which can only meet the scenarios with weak real-time requirements for charging and discharging switching. Summary of the invention

[0005] The object of the present invention is to provide a charging and discharging method of a DC charger and a DC charger, so as to solve the problem of slow charging and discharging switching response speed of an electric vehicle, realize fast and efficient charging and discharging switching of the electric vehicle, and thus promote the interaction between the electric vehicle and the power grid.

[0006] To achieve the above object, on the one hand, the present invention provides a charging and discharging method of a DC charger and discharger, comprising: The output power of the power module of the working part is controlled according to the dispatching instruction; the power module of the hot standby part is in the startup state and works in the hot standby mode; When receiving the instruction to switch the current direction, the power module of the previous working part is in the startup state and works in the hot standby mode and becomes the power module of the hot standby part, and the power module of the previous hot standby part outputs power in the opposite direction of the power module of the previous working part according to the scheduling instruction and becomes the power module of the working part; The power module is used for rectifying to output power in a manner of charging the vehicle and / or for inverting to output power in a manner of discharging the vehicle and transmitting power to the power grid.

[0007] Furthermore, in the charging and discharging method of the above-mentioned DC charger and discharger, the hot standby mode includes a standby state in which the output power is zero.

[0008] Furthermore, in the charging and discharging method of the above-mentioned DC charger and discharger, the hot standby mode includes outputting power in a direction opposite to the power module of the working part, and the output power is equal to the actual power of the power module of the working part minus the required power of the power module.

[0009] Furthermore, the charging and discharging method of the above DC charger and discharger also includes: Within a preset time before switching the current direction, according to the scheduling instruction, the total output power ratio of the power module of the working part and the power module of the hot standby part is set to 2:1, and according to the scheduling instruction, the output power of the power module of the hot standby part is adjusted to reach the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power; When receiving the instruction to switch the current direction, the power module of the previous working part is switched to the standby state with zero output power and becomes the power module of the hot standby part; the power module of the previous hot standby part maintains the current target demand power and becomes the power module of the working part.

[0010] Furthermore, the charging and discharging method of the above-mentioned DC charger and discharger increases the current in steps so that the output power of the power module of the hot standby part reaches the target required power after switching the current direction, and adjusts the output power of the power module of the working part to twice the target required power.

[0011] On the other hand, the present invention also proposes a DC charger and discharger, comprising a controller and at least two power modules, wherein the controller executes instructions to implement the following method steps: The output power of the power module of the working part is controlled according to the dispatching instruction; the power module of the hot standby part is in the startup state and works in the hot standby mode; When receiving the instruction to switch the current direction, the power module of the previous working part is in the startup state and works in the hot standby mode and becomes the power module of the hot standby part, and the power module of the previous hot standby part outputs power in the opposite direction of the power module of the previous working part according to the scheduling instruction and becomes the power module of the working part; The power module is used for rectifying to output power in a manner of charging the vehicle and / or for inverting to output power in a manner of discharging the vehicle and transmitting power to the power grid.

[0012] Furthermore, for the above-mentioned DC charger and discharger, the hot standby mode includes a standby state in which the output power is zero.

[0013] Furthermore, for the above-mentioned DC charger and discharger, the hot standby mode includes outputting power in a direction opposite to the power module of the working part, and the output power is equal to the actual power of the power module of the working part minus the required power of the power module.

[0014] Furthermore, the DC charger and discharger further comprises the following method steps: within a preset time before switching the current direction, according to the scheduling instruction, the total output power ratio of the power module of the working part and the power module of the hot standby part is set to 2:1, according to the scheduling instruction, the output power of the power module of the hot standby part is adjusted to reach the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to 2 times of the target required power; When receiving the instruction to switch the current direction, the power module of the previous working part is switched to the standby state with zero output power and becomes the power module of the hot standby part; the power module of the previous hot standby part maintains the current target demand power and becomes the power module of the working part.

[0015] Furthermore, the DC charger and discharger increases the current in steps so that the output power of the power module of the hot standby part reaches the target required power after switching the current direction, and adjusts the output power of the power module of the working part to twice the target required power.

[0016] The beneficial effects of the present invention are as follows: the output power of the power module of the working part is controlled according to the dispatching instruction; the power module of the hot standby part is in the startup state and works in the hot standby mode; when the instruction to switch the current direction is received, the power module of the previous working part is in the startup state and works in the hot standby mode and becomes the power module of the hot standby part, and the power module of the previous hot standby part outputs power in the opposite direction of the power module of the previous working part according to the dispatching instruction and becomes the power module of the working part; the power module is used for rectifying to output power in a way of charging the vehicle and / or for inverting to output power in a way of discharging the vehicle to transmit power to the power grid, and by setting different state modes for the power module of the working part and the power module of the hot standby part, switching between charging and discharging of the electric vehicle is achieved according to the control instruction, not only without the need to perform operations such as shutting down the power module, but also with fast switching speed and easy operation, thereby efficiently performing vehicle-grid interaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of a charging and discharging method of a DC charger and discharger in an actual application scenario according to one aspect of the present invention; Figure 2 is a structural diagram of a DC charger and discharger in an actual application scenario according to another aspect of the present invention; Wherein, the accompanying drawings are marked as follows: AC: alternating current grid; F1: charging operation platform; F2: virtual power plant dispatching platform; EV1, EV2: electric vehicles; K1: control module; M1: AC / DC bidirectional power supply module (working part module of charging gun 1); M1`: AC / DC bidirectional power supply module (hot standby part module of charging gun 1); M2: AC / DC bidirectional power supply module (working part module of charging gun 2); M2`: AC / DC bidirectional power supply module (hot standby part module of charging gun 2); D: power distribution module; P0: AC power meter; P1: DC power meter of charging gun 1; P2: DC power meter of charging gun 2; C1: charging gun 1; C2: charging gun 2. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The idea of ​​the invention is to divide the power module into a working part and a hot standby part in order to speed up the switching between charging and discharging of a DC charger and discharger, so as to cleverly convert the switching between charging and discharging into the switching between the working part and the hot standby part. There is no need to wait for the charger and discharger to respond, and the charging and discharging switching can be completed efficiently, providing efficient and stable transmission conditions for the interaction between electric vehicles and the power grid.

[0020] Method Example 1: In one aspect of the present invention, a charging and discharging method of a DC charging and discharging machine includes steps S11 and S12, specifically: The DC charger and discharger is externally connected to the power grid, the operation management platform, the virtual power plant platform and at least one electric vehicle, wherein the virtual power plant platform sets and issues dispatch instructions according to the needs of different users or different power plants, wherein the dispatch instructions include but are not limited to the current working direction, the output power of the DC charger and discharger equipment and the dispatch time, etc.

[0021] When the virtual power plant platform issues a dispatch instruction, step S11 controls the output power of the power module of the working part according to the dispatch instruction; the power module of the hot standby part is in the startup state and works in the hot standby mode, wherein the power module is used for rectifying to output power in a manner of charging the vehicle and / or for inverting to output power in a manner of discharging the vehicle to transmit power to the grid.

[0022] Here, the power supply directions provided by the power module of the working part and the power module of the hot standby part are opposite to each other. For example, the power module of the working part is a power module that meets the current charging demand of the electric vehicle, while the power module of the hot standby part is a power module that meets the discharge demand that is opposite to the current charging demand of the electric vehicle.

[0023] At the same time, in actual application scenarios, the power module includes at least two AC / DC bidirectional power modules, wherein the AC / DC bidirectional power modules can work in parallel; the working part and the hot standby part are divided by controlling the current direction of each AC / DC bidirectional power module. Of course, the same AC / DC bidirectional power module can be used as a working part or a hot standby part under different division situations, so as to realize the power module for rectification and / or inversion.

[0024] Step S12, when the instruction to switch the current direction is received, the power module of the previous working part is in the startup state and works in the hot standby mode and becomes the power module of the hot standby part. The power module of the previous hot standby part outputs power in the opposite direction of the power module of the previous working part according to the scheduling instruction and becomes the power module of the working part.

[0025] Through step S11-step S12, by utilizing the division of different power modules, the operating state conversion of the working part and the hot standby part is directly performed to realize the charging and discharging switching of the electric vehicle, and the switching process does not require waiting or other operations, which speeds up the charging and discharging switching speed, facilitates the vehicle-grid interaction after the electric vehicle is connected to the power grid, and improves user satisfaction.

[0026] The present application provides a preferred embodiment of a charging and discharging method for a DC charger and discharger. First, the scheduling instruction issued by the preferred virtual power plant platform is: at time T1, the current working direction of the electric vehicle Car1 is switched from charging to discharging; the AC / DC bidirectional power supply module of the preferred working part provides charging demand. Since the power supply directions provided by the power supply module of the working part and the power supply module of the hot standby part are opposite to each other, the AC / DC bidirectional power supply module of the hot standby part is preferably provided for discharging demand. According to the scheduling instruction, the output power of the AC / DC bidirectional power supply module of the working part is controlled to charge the electric vehicle Car1, and the AC / DC bidirectional power supply module of the hot standby part is controlled to start and work in the hot standby state. When the time T1 is reached, the AC / DC bidirectional power supply module of the previous working part is converted to the hot standby state and becomes the AC / DC bidirectional power supply module of the hot standby part; the AC / DC bidirectional power supply module of the previous hot standby part starts to discharge the electric vehicle Car1 and becomes the AC / DC bidirectional power supply module of the working part.

[0027] Method Example 2: Following the above-mentioned embodiments of the present application, in a charging and discharging method of a DC charger and discharger provided by the present application, the hot standby mode includes a standby state with an output power of zero. At the same time, in the embodiments of the present application, the output power of the power module is adjusted by adjusting the current.

[0028] The present application provides a preferred embodiment of a charging and discharging method for a DC charger and discharger, wherein a preferred virtual power plant platform issues a control instruction that "the electric car Car2 needs to switch from charging 20kW to discharging 20kW at time T2"; according to the control instruction, the AC / DC bidirectional power supply module of the working part provides the electric car Car2 with an output current that meets the charging requirement of 20kW, and the AC / DC bidirectional power supply module of the hot standby part is started but the output current is set to 0, so that the AC / DC bidirectional power supply module of the hot standby part is in a standby state; when time T2 is reached, the AC / DC bidirectional power supply module of the previous working part is started but the output current is 0, and at the same time, it becomes the AC / DC bidirectional power supply module of the hot standby part, so that the AC / DC bidirectional power supply module of the previous working part is in standby state; the AC / DC bidirectional power supply module of the previous hot standby part provides the electric car Car2 with an output current that meets the discharging requirement of 20kW, and at the same time, it becomes the AC / DC bidirectional power supply module of the working part.

[0029] Method embodiment 3: Continuing with the above-mentioned embodiments of the present application, in a charging and discharging method of a DC charger and discharger provided by the present application, the hot standby mode includes outputting power in a direction opposite to the power module of the working part, and the output power is equal to the actual power of the power module of the working part minus the required power of the power module.

[0030] Here, within the preset time before switching the current direction, the total output power ratio of the power module of the working part and the power module of the hot standby part is set to 2:1 according to the scheduling instruction, and the output power of the power module of the hot standby part is adjusted according to the scheduling instruction to reach the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power; here, the target required power refers to the final output power of the whole DC charger and discharger.

[0031] Among them, by increasing the current in steps, the output power of the power module of the hot standby part reaches the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power, thereby achieving a total power ratio of 2:1, and achieving partial current in the output current of the working part and offsetting the output current of the hot standby part, ensuring that the electric vehicle is still in the state corresponding to the working part.

[0032] Here, the preset time is set according to different electric vehicle requirements, etc., so that the setting of the total power ratio is completed before the time for switching the current direction is reached.

[0033] When receiving the instruction to switch the current direction, the power module of the previous working part is switched to the standby state with zero output power and becomes the power module of the hot standby part; the power module of the previous hot standby part maintains the current target demand power and becomes the power module of the working part.

[0034] The present application provides a preferred embodiment of a charging and discharging method of a DC charger and discharger, and the scheduling instruction issued by the preferred virtual power plant platform is: at time T3, the electric car Car3 needs to switch from charging 20kW to discharging 20kW. According to the scheduling instruction, within the preset time before the time T3 is reached, the output total power ratio of the AC / DC bidirectional power supply module of the working part and the AC / DC bidirectional power supply module of the hot standby part is set to 2:1, specifically: the output current of the AC / DC bidirectional power supply module of the working part is adjusted to 2 times the output current of the AC / DC bidirectional power supply module of the hot standby part by 1-5A stepping method (that is, I 工作 =2I 需求 ), adjust the output current of the AC / DC bidirectional power module of the hot standby part to I by 1-5A stepping method 需求 , so that the output current of the working part offsets the output current of the hot standby part, ensuring that the working part provides 20kW charging current for the electric car Car3. When reaching time T3, the output current of the AC / DC bidirectional power module of the previous working part is 0, that is, there is no charging current, and it becomes the AC / DC bidirectional power module of the hot standby part; the AC / DC bidirectional power module of the previous hot standby part provides a discharge current of 20kW and becomes the AC / DC bidirectional power module of the working part.

[0035] Method Example 4: In the actual application scenario, when the hot standby mode is set to the standby state with zero output power, the normal hot standby state is entered; when the hot standby mode is set to output power in the opposite direction of the power module of the working part, the enhanced hot standby state is entered. The default setting is that the charger and discharger enters the normal hot standby state when it is started.

[0036] like Figure 1 As shown, it is a flow chart of a charging and discharging method of a DC charger and discharger in an actual application scenario according to one aspect of the present invention, wherein, after the charger and discharger are connected to the electric vehicle and work normally, the default setting is a normal hot standby state, that is, the hot standby mode is a standby state with zero output power, and the total power ratio of the working part to the hot standby part is set to 1:1. It is determined whether the control module receives the dispatch instruction issued by the virtual power plant platform, and if not, the current normal hot standby state is maintained.

[0037] If so, choose whether to continue in the normal hot standby state. If so, in the normal hot standby mode, control the output current of the power module of the working part to 0, set the output current of the power module of the hot standby part to the target demand current in the scheduling instruction, and interchange the working part module and the hot standby part module.

[0038] If not, switch to enhanced hot standby mode, adjust the current according to the scheduling instruction, and determine whether the time for switching the current direction reaches 90s. If not, continue to adjust the current; if yes, set the total power ratio of the power module of the working part and the power module of the hot standby part to 2:1, and the hot standby part module increases the output current from 0 to the target demand current in steps of 1-5A (select the appropriate current value according to the actual situation). At the same time, the output current of the power module of the working part increases (in steps of 1-5A) to 2 times the target demand current, and the preparation for enhanced hot standby mode is completed. When the time for switching the current direction is reached, the current direction is switched immediately, that is, the power module of the working part enters standby mode, that is, the output current of the working part is 0, and the output current of the power module of the hot standby part is set to the target demand current, and the working part and the hot standby part are interchanged.

[0039] The enhanced hot standby state utilizes the redundant power modules of the DC charger and discharger to set the current of the hot standby part to the opposite direction of the current demand direction, and gradually increases the reverse output power, so that the hot standby module is in a high-power output state. When the current changes, it can be seamlessly switched in, saving the time required for the output current to rise, and quickly responding to the control instructions of the virtual power plant platform.

[0040] The number of power modules in the working part and the hot standby part can be adjusted according to the actual situation, and can be set to a mixed hot standby mode according to the specific application scenario, that is, the hot standby part can have a part of output power of 0 and another part of output power greater than 0. A balance is achieved between energy saving and fast response.

[0041] DC Charger and Discharger Embodiment 1: like Figure 2 As shown, it is a structural diagram of a DC charger and discharger in another aspect of the present invention in an actual application scenario, wherein the DC charger and discharger includes a control module K1, a power distribution module D, an AC / DC bidirectional power module array (M1, M1`, M2, M2`, wherein M1: AC / DC bidirectional power module, i.e., the working part module of charging gun 1; M1`: AC / DC bidirectional power module, i.e., the hot standby part module of charging gun 1; M2: AC / DC bidirectional power module, i.e., the working part module of charging gun 2; M2`: AC / DC bidirectional power module, i.e., the hot standby part module of charging gun 2), a metering module (P0-P2, wherein P0: an AC energy meter; P1: a DC energy meter of charging gun 1; P2: a DC energy meter of charging gun 2;), a charging gun (C1, C2), etc., wherein the control module has a built-in current fast switching algorithm and control logic. The periphery of the DC charger and discharger includes an AC power grid AC, a charging operation platform F1, a virtual power plant dispatching platform F2, electric vehicles (EV1, EV2), etc.

[0042] The metering module is divided into an AC metering module and a DC metering module. The AC metering module P0 is used to measure the charging and discharging energy, voltage, current, power and other parameters of the AC side of the DC charger and discharger. The DC metering modules (P1, P2) correspond to the charging guns (C1, C2) one by one and are used to measure the DC input and output energy, voltage, current, power and other parameters of each charging gun.

[0043] The AC / DC bidirectional power supply module array includes multiple AC / DC bidirectional power supply modules, which can work in parallel. The control module K1 allocates an AC / DC bidirectional power supply module to each charging gun (C1 is allocated to M1 and M1`; C2 is allocated to M2 and M2`) by controlling the switch matrix in the power distribution module D, and sets these bidirectional power supply modules as a working part and a hot standby part, wherein the power supply module of the working part outputs according to the current direction required by the electric vehicles EV1 and EV2, and the working direction of the power supply module of the hot standby part is set to reverse and is set to the start state.

[0044] The DC charger and discharger is designed with two hot standby modes: ordinary hot standby and enhanced hot standby. In ordinary hot standby, the output power of the power module of the working part is the power required by the electric vehicles EV1 and EV2, the power of the power module of the hot standby part is 0, and the ratio of the working part and the hot standby part is 1:1. In enhanced hot standby, the total power ratio of the working part and the hot standby part is preferably 2:1, and the total power ratio can be set according to different requirements, so that ordinary hot standby shortens the switching time of the charging and discharging current direction to less than 3s, and the enhanced hot standby mode shortens the switching time of the charging and discharging current direction to less than 100ms.

Claims

1. A charging and discharging method for a DC charging and discharging machine, characterized in that: include: The output power of the power module of the working part is controlled according to the dispatching instruction; the power module of the hot standby part is in the startup state and works in the hot standby mode; When receiving the instruction to switch the current direction, the power module of the previous working part is in the startup state and works in the hot standby mode and becomes the power module of the hot standby part, and the power module of the previous hot standby part outputs power in the opposite direction of the power module of the previous working part according to the scheduling instruction and becomes the power module of the working part; The power module is used for rectifying to output power in a manner of charging the vehicle and / or for inverting to output power in a manner of discharging the vehicle and transmitting power to the power grid.

2. The charging and discharging method of a DC charger and discharger according to claim 1, characterized in that: The hot standby mode includes a standby state in which the output power is zero.

3. The charging and discharging method of a DC charger and discharger according to claim 1, characterized in that: The hot standby mode includes outputting power in a direction opposite to the power module of the working part, and the output power is equal to the actual power of the power module of the working part minus the required power of the power module.

4. The charging and discharging method of a DC charger and discharger according to claim 3, characterized in that: Also includes: Within a preset time before switching the current direction, according to the scheduling instruction, the total output power ratio of the power module of the working part and the power module of the hot standby part is set to 2:1, and according to the scheduling instruction, the output power of the power module of the hot standby part is adjusted to reach the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power; When receiving the instruction to switch the current direction, the power module of the previous working part is switched to the standby state with zero output power and becomes the power module of the hot standby part; the power module of the previous hot standby part maintains the current target demand power and becomes the power module of the working part.

5. The charging and discharging method of a DC charger and discharger according to claim 4, characterized in that: By increasing the current in steps, the output power of the power module of the hot standby part reaches the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power.

6. A DC charging and discharging machine, characterized in that: The invention comprises a controller and at least two power supply modules, wherein the controller executes instructions for implementing the following method steps: The output power of the power module of the working part is controlled according to the dispatching instruction; the power module of the hot standby part is in the startup state and works in the hot standby mode; When receiving the instruction to switch the current direction, the power module of the previous working part is in the startup state and works in the hot standby mode and becomes the power module of the hot standby part, and the power module of the previous hot standby part outputs power in the opposite direction of the power module of the previous working part according to the scheduling instruction and becomes the power module of the working part; The power module is used for rectifying to output power in a manner of charging the vehicle and / or for inverting to output power in a manner of discharging the vehicle and transmitting power to the power grid.

7. The DC charger and discharger according to claim 6, characterized in that: The hot standby mode includes a standby state in which the output power is zero.

8. The DC charger and discharger according to claim 6, characterized in that: The hot standby mode includes outputting power in a direction opposite to the power module of the working part, and the output power is equal to the actual power of the power module of the working part minus the required power of the power module.

9. The DC charger and discharger according to claim 6, characterized in that: Also includes: Within a preset time before switching the current direction, according to the scheduling instruction, the total output power ratio of the power module of the working part and the power module of the hot standby part is set to 2:1, and according to the scheduling instruction, the output power of the power module of the hot standby part is adjusted to reach the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power; When receiving the instruction to switch the current direction, the power module of the previous working part is switched to the standby state with zero output power and becomes the power module of the hot standby part; the power module of the previous hot standby part maintains the current target demand power and becomes the power module of the working part.

10. The DC charger and discharger according to claim 6, characterized in that: By increasing the current in steps, the output power of the power module of the hot standby part reaches the target required power after switching the current direction, and the output power of the power module of the working part is adjusted to twice the target required power.

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