Power conversion system and power supply control method for power conversion system

Abstract

This application provides a power conversion system and a power supply control method for the power conversion system. The power conversion system includes a switching switch and multiple power devices. The AC output ports of each power device are connected in parallel and then connected to the second port of the switching switch. The first port of the switching switch is used to connect to the power grid. The first side of the controllable switch in the switching switch is electrically connected to the first port, and the second side of the controllable switch is electrically connected to the second port. The first acquisition module in the switching switch is used to acquire the port electrical parameters of the first port. The power conversion system is configured to determine the power grid status information based on the port electrical parameters acquired by the first acquisition module, and determine the target operating state of the power conversion system according to the power grid status information. Based on the target operating state, the power devices are controlled to operate in the target working mode, and the controllable switch is controlled to switch to the target on / off state. This greatly reduces the cost and construction difficulty of the power conversion system's on / off mode switching scheme.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a power conversion system and a power supply control method for the power conversion system. Background Technology

[0002] In a multi-machine parallel centralized load system, there are usually multiple power devices such as inverters connected in parallel, so that the load can be powered together by each power device.

[0003] Currently, in order to switch between grid-connected and off-grid modes, each power device is usually equipped with a grid-connected port and an off-grid port on its AC side. The grid-connected port of each power device is used to connect to the power grid, and the off-grid port of each power device is used to connect to the load. As a result, each power device needs two sets of independent power cables to connect to the power grid and the load, which is costly and difficult to construct. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a power conversion system and a power supply control method for the power conversion system, thereby solving the problems of high cost and difficult construction in the prior art for switching between grid-connected and off-grid modes of power equipment.

[0005] To achieve the above technical objectives, the embodiments of this application provide the following technical solutions: In one aspect, embodiments of this specification provide a power conversion system, including a switching switch and multiple power devices, wherein the AC output ports of each power device are connected in parallel and then connected to the second port of the switching switch; the first port of the switching switch is used to connect to the power grid. The switching switch includes a controllable switch and a first acquisition module. The first side of the controllable switch is electrically connected to the first port, and the second side of the controllable switch is electrically connected to the second port. The first acquisition module is used to acquire the port electrical parameters of the first port. The power conversion system is configured as follows: Based on the port electrical parameters collected by the first acquisition module, the power grid status information of the power grid is determined; Based on the power grid status information, the target operating state of the power conversion system is determined; under the target operating state, the power equipment operates in the target working mode, and the controllable switch is in the target on / off state; Based on the target operating state, control each of the power devices to operate in the target working mode, and control the controllable switch to switch to the target on / off state.

[0006] Secondly, this specification provides a power supply control method for a power conversion system. The power conversion system includes a switching switch and multiple power devices. The AC output ports of each power device are connected in parallel and then connected to a second port of the switching switch. The first port of the switching switch is used to connect to the power grid. The switching switch includes a controllable switch and a first acquisition module. A first side of the controllable switch is electrically connected to the first port, and a second side of the controllable switch is electrically connected to the second port. The first acquisition module is used to acquire port electrical parameters of the first port. The method includes: Based on the port electrical parameters collected by the first acquisition module, the power grid status information of the power grid is determined; Based on the power grid status information, the target operating state of the power conversion system is determined; under the target operating state, the power equipment operates in the target working mode, and the controllable switch in the switching switch is in the target on / off state; Based on the target operating state, control each of the power devices to operate in the target working mode, and control the controllable switch to switch to the target on / off state.

[0007] As can be seen from the above technical solutions, the embodiments of this application provide a power conversion system and a power supply control method for the power conversion system. The power conversion system includes a switching switch and multiple power devices. The AC output ports of each power device are connected in parallel and then connected to the second port of the switching switch. The first port of the switching switch is used to connect to the power grid. The switching switch includes a controllable switch and a first acquisition module. The first side of the controllable switch is electrically connected to the first port, and the second side of the controllable switch is electrically connected to the second port. The first acquisition module is used to acquire the port electrical parameters of the first port. The power conversion system is configured to determine the power grid status information based on the port electrical parameters acquired by the first acquisition module, and determine the target operating state of the power conversion system according to the power grid status information. Under the target operating state, the power devices operate in... In the target operating mode, the controllable switch is in the target on / off state. The power conversion system is also configured to control each power device to operate in the target operating mode according to the target operating state, and to control the controllable switch to switch to the target on / off state. Therefore, it is only necessary to connect a switching switch between the parallel point of the AC output port of each power device and the power grid, and control the on / off state of the controllable switch and the operating mode of each power device according to the port electrical parameters collected by the first acquisition module in the switching switch. This can realize the switching of the power conversion system between the grid and off-grid modes. There is no need to set up grid-connected and off-grid ports on the AC side of each power device, and there is no need to configure two sets of power cables for each power device to connect to the power grid and the load. This greatly reduces the cost and construction difficulty of the power conversion system's grid-connected and off-grid mode switching scheme. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0009] Figure 1 This is a structural schematic diagram of a multi-machine parallel centralized load-bearing system provided in the prior art.

[0010] Figure 2 This is a schematic diagram of a switching switch provided for implementation of this specification.

[0011] Figure 3 This is a schematic diagram of another switching switch provided for an embodiment of this specification.

[0012] Figure 4 This is a schematic diagram of another switching switch provided for embodiments of this specification.

[0013] Figure 5 This is a schematic diagram of a power conversion system provided for the implementation of this specification.

[0014] Figure 6 This is a flowchart illustrating a power supply control method for a power conversion system provided for embodiments of this specification. Detailed Implementation

[0015] Unless otherwise defined, the technical or scientific terms used in the embodiments of this specification shall have the ordinary meaning understood by one of ordinary skill in the art to which this specification pertains. The terms "first," "second," and similar terms used in the embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to avoid confusion of constituent elements.

[0016] Unless the context otherwise requires, throughout this specification, "a plurality of" means "at least two," and "including" is interpreted as open-ended or encompassing, that is, "including, but not limited to." In the description of this specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this specification. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example.

[0017] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0018] As described in the background section, a multi-machine parallel centralized load system typically includes multiple inverters and other power devices connected in parallel to jointly supply power to the load. During load power supply, there are generally two modes: grid-connected and off-grid. In grid-connected mode, each power device supplies power to the load together with the grid. In off-grid mode, each power device supplies power to the load individually or in conjunction with generators or other power generation devices. Furthermore, even when the AC output of each power device stops, power can still be supplied to the load through the grid.

[0019] Currently, to enable switching between grid-connected and off-grid modes, each power device typically has a grid-connected port and an off-grid port on its AC side. The grid-connected port of each power device is used to connect to the power grid, and the off-grid port is used to connect to the load. For example, existing multi-machine parallel centralized load-bearing systems can be configured as follows: Figure 1 As shown, each power device 100 includes an inverter circuit 101, an AC switch 102, a grid connection port 103, and an off-grid port 104. The DC side of the inverter circuit 101 is used to electrically connect to a DC power supply 400 (such as a photovoltaic module, energy storage battery, etc.). The AC side of the inverter circuit 101 is connected to the grid connection port 103 through the AC switch 102. At the same time, the AC side of the inverter circuit 101 is also connected to the off-grid port 104. The grid connection ports 103 of each power device 100 are connected in parallel. At the same time, the off-grid ports 104 of each power device 100 are connected in parallel. The parallel connection point of the grid connection port 103 of each power device 100 is used to connect to the power grid 200. The parallel connection point of the off-grid port 104 of each power device 100 is used to connect to the load 300. A meter 500 can be installed between the parallel connection point of the grid connection port 103 of each power device 100 and the power grid 200 for power energy detection. A bypass switch 600 can also be installed between the power grid 200 and the load 300. One side of the bypass switch 600 is connected between the parallel connection point of the grid connection port 103 of each power device 100 and the power grid 200, and the other side of the bypass switch 600 is connected between the parallel connection point of the off-grid port 103 of each power device 100 and the load 300. Before the AC switch 102 of each power device 100 is closed, the bypass switch 600 can be closed first to supply power to the load 300. This is to avoid the situation where the current of the load 300 flows through the power device 100 first when the AC switch 102 of a certain power device 100 is closed first, which could cause the AC switch 102 of that power device 100 to become stuck due to overload.

[0020] However, with this solution, each power device 100 requires two sets of independent power cables to connect to the power grid 200 and the load 300, which is costly and difficult to implement.

[0021] To address the high cost and complex construction of traditional power device 100 switching between grid-connected and off-grid modes, this application provides a power conversion system and its power supply control method. The power conversion system includes a switching switch and multiple power devices 100. The AC output ports of each power device 100 are connected in parallel to the second port of the switching switch. The first port of the switching switch is connected to the power grid 200. The switching switch includes a controllable switch and a first acquisition module. The first side of the controllable switch is electrically connected to the first port, and the second side is electrically connected to the second port. The first acquisition module collects the port electrical parameters of the first port. The power conversion system is configured to determine the grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module, and to determine the target operating state of the power conversion system based on the grid status information. Under the target operating state, the power devices... The power conversion system is configured to operate each power device 100 in the target working mode and controllable switches in the target on / off state, based on the target operating state. This means that only a switching switch needs to be connected between the parallel point of the AC output port of each power device 100 and the power grid 200. The on / off state of the controllable switch and the working mode of each power device 100 are controlled according to the port electrical parameters collected by the first acquisition module in the switching switch. This allows for the switching between grid-connected and off-grid modes of the power conversion system. There is no need to set up a grid-connected port 103 and an off-grid port 104 on the AC side of each power device 100, and therefore no need to configure two sets of power cables for each power device 100 to connect the power grid 200 and the load 300. This significantly reduces the cost and construction difficulty of the grid-connected / off-grid mode switching scheme for the power conversion system.

[0022] The power conversion system and power supply control method of the power conversion system proposed in the embodiments of this application will be described exemplarily below.

[0023] This application first proposes a switching switch 700, referring to... Figure 2 It includes a first processor 701, a controllable switch 702, a first acquisition module 703, a first port 704, a second port 705, and a communication port 706; the first port 704 is used to connect to the power grid 200, and the second port 705 is used to connect to the AC output ports of multiple power devices 100.

[0024] The first side of the controllable switch 702 is electrically connected to the first port 704, and the second side of the controllable switch 702 is electrically connected to the second port 705.

[0025] The first acquisition module 703 is electrically connected to the first port 704. For example, it can be set between the first side of the controllable switch 702 and the first port 704 to detect the port electrical parameters of the first port 704. The port electrical parameters of the first port 704 may include some or all of the parameters of the voltage amplitude, voltage frequency and voltage phase of the first port 704. The first acquisition module 703 can capture the zero-crossing point of the voltage through the capture circuit and use the zero-crossing point information of the voltage as the voltage phase of the first port 704.

[0026] The communication port 706 is used for communication connection with the main power device 105 in each power device 100. The communication port 706 can include various combinations such as RS485, CAN, ETH, DI, and DO. For example, the communication port 706 can adopt the combination of RS485+DI+DO, using RS485 to transmit data such as electricity meter 500, using DI to realize grid-connected and off-grid switching control, and using DO to provide feedback on the on / off status of controllable switch 702. In addition, the communication port 706 can also adopt the combination of CAN / ETH+DO, using CAN / ETH to transmit data such as electricity meter 500 and realize grid-connected and off-grid switching control, and using DO to provide feedback on the on / off status of controllable switch 702.

[0027] The first processor 701 is used to control the operation of the controllable switch 702 and to control the adjustment of the working mode of each power device 100 according to the port electrical parameters collected by the first acquisition module 703.

[0028] The controllable switch 702 can be 1P, 2P, 3P, or 4P to meet the requirements of different phase numbers in the power grid 200. For example, when the power grid 200 is a single-phase grid, the controllable switch 702 can be 1P or 2P. If the controllable switch 702 is 1P, a connection port or signal line can be reserved on the neutral (N) line to achieve sampling. When the power grid 200 is a three-phase grid, the controllable switch 702 can be 3P or 4P. If the controllable switch 702 is 3P, a connection port or signal line can be reserved on the neutral (N) line to achieve sampling. The controllable switch 702 can take various forms, such as a circuit breaker, contactor, electronic switch, or IGBT (Insulated-Gate Bipolar Transistor) module.

[0029] In some embodiments, the first processor 701 is specifically used to: generate feedback information based on the port electrical parameters collected by the first acquisition module 703, and send the feedback information to the main power device 105; wherein the feedback information carries indication information indicating the operating status of the power grid 200, so that the main power device 105 determines the power grid status information of the power grid 200 according to the indication information carried in the feedback information, determines the target operating status of the power conversion system according to the power grid status information, controls the controllable switch 702 to operate according to the target operating status of the power conversion system, and controls each power device 100 to adjust its operating mode.

[0030] Optionally, the first processor 701 is specifically used to: use the port electrical parameters collected by the first acquisition module 703 as indication information in the feedback information.

[0031] Optionally, the first processor 701 is specifically used to: determine the power grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703, and use the power grid status information as the indication information in the feedback information.

[0032] Optionally, the first processor 701 is specifically used to: receive a second control command from the main power device 105 for the controllable switch 702 via the communication port 706, and control the controllable switch 702 to operate according to the control action indicated by the second control command; wherein, the second control command is a control command generated by the main power device 105 according to the target operating state of the power conversion system. In the target operating state, the power device 100 operates in the target working mode, and the controllable switch 702 is in the target on / off state. The second control command is used to control the controllable switch 702 to switch to the target on / off state.

[0033] Optionally, the switch 700 may also include a second acquisition module 707, which is electrically connected to the second port 705. For example, it may be located between the second side of the controllable switch 702 and the second port 705 to detect the port electrical parameters of the second port 705. The port electrical parameters of the second port 705 may include some or all of the parameters of the voltage amplitude, voltage frequency and voltage phase of the second port 705. The second acquisition module 707 may capture the zero-crossing point of the voltage through the capture circuit and use the zero-crossing point information of the voltage as the voltage phase of the second port 705.

[0034] The first processor 701 is specifically used to: generate feedback information based on the port electrical parameters collected by the first acquisition module 703 and the second acquisition module 707, and send the feedback information to the main power device 105.

[0035] And / or, the first processor 701 is specifically used to: determine the execution action for the controllable switch 702 based on the port electrical parameters collected by the first acquisition module 703, the port electrical parameters collected by the second acquisition module 707, and the control action indicated by the second control command, and control the controllable switch 702 to operate according to the execution action so that the controllable switch 702 switches to the target on / off state.

[0036] For example, when the control action indicated by the second control command is an engaging action, the first processor 701 can determine that the action to be performed on the controllable switch 702 is an engaging action if the port electrical parameters acquired by the first acquisition module 703 and the second acquisition module 707 are consistent, thus ensuring reliable control of the controllable switch 702. Therefore, even when the output phase sequence of the power device 100 is inconsistent with the grid-side phase sequence of the controllable switch 702, by simultaneously referencing the port electrical parameters acquired by the first acquisition module 703 and the second acquisition module 707 to control the controllable switch 702, reliable control of the controllable switch 702 can be guaranteed.

[0037] Optionally, in the case of a three-phase power grid 200, in order to save the cost and space of the switching switch 700, both the first acquisition module 703 and the second acquisition module 707 can acquire only the voltage phase and voltage amplitude of one phase, or they can acquire the voltage phase and voltage amplitude of all three phases.

[0038] Optionally, the first processor 701 can also determine the parameter difference between the port electrical parameters acquired by the first acquisition module 703 and the port electrical parameters acquired by the second acquisition module 707, and send the parameter difference as feedback information to the main power device 105, so that the main power device 105 adjusts its own AC output according to the parameter difference, and controls each slave power device 106 to adjust its AC output.

[0039] In some embodiments, the first processor 701 is specifically used to: determine the power grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703, and determine the target operating state of the power conversion system according to the power grid status information, so as to control the operation of the controllable switch 702 according to the target operating state of the power conversion system, and control each power device 100 to adjust its operating mode.

[0040] Optionally, the first processor 701 is specifically used to: control the controllable switch 702 to switch to the target on / off state according to the target operating state of the power conversion system, and generate a third control command indicating that the power device 100 is operating in the target working mode and send it to the main power device 105; wherein, in the target operating state, the power device 100 is operating in the target working mode and the controllable switch 702 is in the target on / off state.

[0041] Optionally, the switch 700 may also include a second acquisition module 707, which is electrically connected to the second port 705. For example, it may be located between the second side of the controllable switch 702 and the second port 705 to detect the port electrical parameters of the second port 705. The port electrical parameters of the second port 705 may include some or all of the parameters of the voltage amplitude, voltage frequency and voltage phase of the second port 705.

[0042] The first processor 701 is specifically used to: control the controllable switch 702 to switch to the target on / off state according to the target operating state of the power conversion system, the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, and generate a third control command indicating that the power device 100 is operating in the target working mode and send it to the main power device 105.

[0043] Optionally, the first processor 701 is specifically used to: generate a third control command indicating that the power device 100 is operating in the target working mode and send it to the main power device 105 when the target operating state of the power conversion system is grid-connected mode; and control the controllable switch 702 to switch to the target on / off state in response to the port electrical parameters collected by the first acquisition module 703 being consistent with the port electrical parameters collected by the second acquisition module 707; or control the controllable switch 702 to switch to the target on / off state in response to the feedback signal sent by the main power device 105 indicating that the port electrical parameters of the AC output ports of each power device 100 are consistent with the port electrical parameters collected by the first acquisition module 703.

[0044] Optionally, the first processor 701 is specifically configured to: determine the current operating mode of the power conversion system based on the port electrical parameters collected by the second acquisition module 707 when the target operating state of the power conversion system is grid-connected mode; generate a third control command indicating that the power device 100 operates in the target operating mode and send it to the main power device 105 when the current operating mode of the power conversion system is off-grid mode; and control the controllable switch 702 to switch to the target on / off state in response to the port electrical parameters collected by the first acquisition module 703 being consistent with the port electrical parameters collected by the second acquisition module 707; and control the controllable switch 702 to switch to the target on / off state when the current operating mode of the power conversion system is standby mode; and generate a third control command indicating that the power device 100 operates in the target operating mode and send it to the main power device 105.

[0045] In some embodiments, the target operating state is grid-connected mode, the target working mode is grid-connected working mode, and the target on / off state is switch-on state. The target operating state is off-grid mode, the target working mode is off-grid working mode, and the target on / off state is switch off.

[0046] In some embodiments, the power grid status information may include first status information indicating that the power grid 200 is operating normally, and may also include second status information indicating that the power grid 200 is operating abnormally. For example, when the power grid status information is the first status information (i.e., the voltage of the power grid 200 is within a preset voltage range of the power grid 200, and the frequency of the power grid 200 is within a preset frequency range of the power grid 200), it may be determined that the power grid status information changes from the first status information to the second status information, i.e., the power grid 200 enters an abnormal state, if the duration for which the voltage of the power grid 200 exceeds the preset voltage range of the power grid 200 reaches a first target duration, and / or the duration for which the frequency of the power grid 200 exceeds the preset frequency range of the power grid 200 reaches a second target duration. In addition, when the power grid status information is the second status information (i.e., the voltage of the power grid 200 exceeds the preset voltage range of the power grid 200, and / or the frequency of the power grid 200 exceeds the preset frequency range of the power grid 200), it can be determined that the power grid status information is switched from the second status information to the first status information when the duration of the voltage of the power grid 200 within the preset voltage range of the power grid 200 reaches the third target duration and the duration of the frequency of the power grid 200 within the preset frequency range of the power grid 200 reaches the fourth target duration, that is, the power grid 200 returns to normal status.

[0047] In some embodiments, refer to Figure 3 The switching switch 700 also includes an auxiliary power circuit 708; The auxiliary power source circuit 708 includes an auxiliary power source input terminal, a conversion circuit, and an auxiliary power source output terminal. The auxiliary power input terminal is electrically connected to the first port 704 and / or the second port 705; The conversion circuit is used to convert the AC power input at the auxiliary power source input terminal into DC power and output it from the auxiliary power source output terminal; The auxiliary power output terminal is electrically connected to the power supply port of the 700 switching switch.

[0048] The power supply port of the switch 700 can be set at the first processor 701 so that the first processor 701 can be powered through the auxiliary power circuit 708.

[0049] When the auxiliary power input terminal is electrically connected to the first port 704, the first processor 701 can be powered by the auxiliary power circuit 708 drawing power from the grid side of the controllable switch 702. Thus, when the grid 200 is powered, the first processor 701 can be self-powered, thereby ensuring the effective operation of the first processor 701 and further improving the integration of the switching switch 700.

[0050] When the auxiliary power input terminal is electrically connected to the second port 705, the first processor 701 can be powered by the auxiliary power circuit 708 drawing power from the power device side of the controllable switch 702. Thus, when any power device 100 is powered, the first processor 701 can be self-powered, thereby ensuring the effective operation of the first processor 701 and further improving the integration of the switching switch 700.

[0051] When the auxiliary power input terminal is simultaneously connected to the first port 704 and the second port 705, the first processor 701 can be self-powered when the power grid 200 or any power device 100 is powered, thereby ensuring the effective operation of the first processor 701 and further improving the integration of the switching switch 700.

[0052] Optionally, the switching switch 700 includes at least two auxiliary power circuits 708; In this circuit, at least one auxiliary power source circuit 708 has its auxiliary power source input terminal electrically connected to the first port 704; and at least one auxiliary power source circuit 708 has its auxiliary power source input terminal electrically connected to the second port 705.

[0053] Optional, refer to Figure 3 The changeover switch 700 also includes a power output port 709, which is electrically connected to the auxiliary power output terminal to supply power to the outside through the power output port 709, thereby effectively meeting the application scenarios that require external power supply and improving the applicability of the changeover switch 700.

[0054] It is understood that when the switch 700 includes multiple auxiliary power circuits 708, the switch 700 may include multiple power output ports 709 that are connected one-to-one with the auxiliary power output terminals of the multiple auxiliary power circuits 708, and may also include one or more power output ports 709 that are connected one-to-one with the auxiliary power output terminals of some of the auxiliary power circuits 708.

[0055] Optional, refer to Figure 4 The switching switch 700 also includes a gating circuit 710, through which the auxiliary power input terminal is electrically connected to the first port 704 and the second port 705. The gating circuit 710 includes a first gating input terminal, a second gating input terminal, a gating output terminal, and a gating control terminal. The first strobe input terminal is electrically connected to the first port 704, the second strobe input terminal is electrically connected to the second port 705, the strobe output terminal is electrically connected to the auxiliary power input terminal, and the strobe control terminal is electrically connected to the first port 704 or the second port 705. The gating circuit 710 is used to connect the gating output terminal to the first gating input terminal, or connect the gating output terminal to the second gating input terminal, based on the relationship between the input voltage of the gating control terminal and the preset voltage.

[0056] The auxiliary power supply circuit 701 can be electrically connected to the auxiliary power supply input of the auxiliary power supply circuit 708. The first auxiliary power supply input can be electrically connected to the first port 704 of the switch 700. Therefore, when the first auxiliary power supply input and the auxiliary power supply output are connected, the auxiliary power supply circuit 708 can draw power from the mains side of the controllable switch 702 to supply power to the first processor 701. The second auxiliary power supply input can be electrically connected to the second port 705 of the switch 700. Therefore, when the second auxiliary power supply input and the auxiliary power supply output are connected, the auxiliary power supply circuit 708 can draw power from the power device side of the controllable switch 702 to supply power to the first processor 701.

[0057] The gating control terminal can be electrically connected to either the first port 704 or the second port 705 of the switch 700 to receive the voltage provided by the target port of the first port 704 or the second port 705. The target port can be either the first port 704 or the second port 705 that is electrically connected to the gating control terminal. Therefore, by determining the relationship between the input voltage of the gating control terminal and a preset voltage, the gating output terminal can be connected to the first gating input terminal, or the gating output terminal can be connected to the second gating input terminal.

[0058] For example, when the gating control terminal is electrically connected to the first port 704, the gating output terminal can be connected to the first gating input terminal when the input voltage of the gating control terminal is greater than or equal to a preset voltage, and the gating output terminal can be connected to the second gating input terminal when the input voltage of the gating control terminal is less than the preset voltage. This allows the first processor 701 to be powered preferentially by drawing power from the grid side of the controllable switch 702 via the auxiliary power supply circuit 708 when the grid side of the controllable switch 702 is energized. When the gating control terminal is electrically connected to the second port 705, the gating output terminal can be connected to the second gating input terminal when the input voltage of the gating control terminal is greater than or equal to a preset voltage, and the gating output terminal can be connected to the first gating input terminal when the input voltage of the gating control terminal is less than the preset voltage. This allows the first processor 701 to be powered preferentially by drawing power from the power device side of the controllable switch 702 via the auxiliary power supply circuit 708 when the power device side of the controllable switch 702 is energized.

[0059] Optionally, the selection circuit 710 may include a switch module, which may include a switch (e.g., a positive switch and a negative switch) disposed between the first port 704 and the auxiliary power input terminal of the auxiliary power circuit 708, and a switch (e.g., a positive switch and a negative switch) disposed between the second port 705 and the auxiliary power input terminal of the auxiliary power circuit 708. The switch module may also include a single-pole double-throw relay (e.g., a positive single-pole double-throw relay and a negative single-pole double-throw relay), which can be configured according to actual needs.

[0060] Therefore, through the solution of this application embodiment, only an auxiliary power supply circuit 708 is needed to realize the self-powering of the first processor 701 when either the grid side or the power device side of the controllable switch 702 is powered, thereby ensuring the effective operation of the first processor 701 and reducing the cost and size of the switching switch 700.

[0061] In some embodiments, refer to Figure 4 The switching switch 700 also includes a DC power supply 711. The output port of the DC power supply 711 is electrically connected to the power supply port of the switching switch 700 so as to supply power to the first processor 701 through the DC power supply 711. The DC power supply 711 can be a supercapacitor or a storage battery, so as to meet the power supply needs of the first processor 701 in the case of low voltage ride-through of the power grid 200, power failure of the power grid 200, and no power output of each power device 100.

[0062] In some embodiments, refer to Figure 4 The switch 700 also includes a power input port 712, which is electrically connected to the power supply port of the switch 700. The power input port 712 is used to connect to the power supply.

[0063] The power input port 712 can be used to connect a power supply. Thus, when the power supply is connected to the power input port 712, the first processor 701 can be powered by the power supply. Therefore, when the auxiliary power circuit 708 and the DC power supply 711 inside the switch 700 cannot power the first processor 701, the power supply can still be connected through the power input port 712, thereby effectively meeting the power supply requirements of the first processor 701.

[0064] In some embodiments, refer to Figure 4 The switching switch 700 also includes a current sensor 713 and / or a current input port 714. The current sensor 713 is disposed between the first side of the controllable switch 702 and the first port 704 for detecting current signals. The current input port 714 is used to receive current signals detected by an external current sensor, including current signals flowing through the controllable switch 702 and / or current signals from external devices.

[0065] The current sensor 713 is disposed between the first side of the controllable switch 702 and the first port 704, and is used to detect the current signal on the grid side of the controllable switch 702. The first processor 701 can also be electrically connected to the current sensor 713 to receive the current signal detected by the current sensor 713. The first processor 701 can determine the output power of the grid 200 based on the current signal detected by the current sensor 713. The first processor 701 can also send the current signal detected by the current sensor 713 to the main power device 105 through the communication port 706, so that the main power device 105 can determine the output power of the grid 200 based on the current signal detected by the current sensor 713. Thus, the power metering function can be integrated into the switching switch 700, and there is no need to install metering devices such as the electricity meter 500, which further reduces the construction difficulty and cost.

[0066] The current input port 714 can be used to receive the current signal detected by an external current sensor. The current signal detected by the external current sensor may include the current signal flowing through the controllable switch 702 and / or the current signal of an external device. The external device may include other power devices besides the power devices 100 connected to the switch 700.

[0067] The first processor 701 can also be electrically connected to the current input port 714 to receive the current signal detected by the external current sensor through the current input port 714. The first processor 701 can determine the output power of the grid 200 based on the current signal flowing through the controllable switch 702. It can also send the current signal flowing through the controllable switch 702 to the main power device 105 through the communication port 706, so that the main power device 105 can determine the output power of the grid 200 based on the current signal flowing through the controllable switch 702. This allows the power metering function to be integrated into the switching switch 700 without the need to install metering devices such as the electricity meter 500, further reducing the construction difficulty and cost. In addition, the first processor 701 can generate a power adjustment command based on the current signal of the external device and send it to the main power device 105, so that the main power device 105 can adjust its own AC output and control each slave power device 106 to adjust its AC output according to the power adjustment command. The first processor 701 can also send the current signal of the external device to the main power device 105 through the communication port 706, so that the main power device 105 can adjust its own AC output and control each slave power device 106 to adjust its AC output according to the current signal of the external device, so as to realize the coordinated grid connection of each power device 100 with the external device, and further improve the integration of the switching switch 700.

[0068] In some embodiments, the controllable switch 702 includes a controllable circuit breaker, which is used to disconnect when a second target current is greater than a preset current, wherein the second target current is the current flowing through the controllable circuit breaker.

[0069] The controllable circuit breaker can integrate a trip unit. The trip unit can be activated when the current flowing through it is greater than the preset current, causing the controllable circuit breaker to trip and disconnect the connection between each power device 100 and the power grid 200, thereby realizing overcurrent protection or short circuit protection. This allows for the integration of safety protection functions into the switching switch 700, further improving the integration level of the switching switch 700.

[0070] In some embodiments, the switch 700 further includes a temperature sensor for detecting a temperature signal within the switch 700; The switch 700 is also configured to control the controllable switch 702 to open when the temperature signal detected by the temperature sensor is greater than a preset temperature.

[0071] The first processor 701 can also be electrically connected to a temperature sensor to receive the temperature signal detected by the temperature sensor, and when the temperature signal detected by the temperature sensor indicates that the internal temperature of the switching switch 700 is greater than the preset temperature, it controls the controllable switch 702 to open, so as to ensure the safe grid connection of each power device 100.

[0072] In some embodiments, the switch 700 further includes an instruction input module for receiving a manual control instruction triggered by a human for the controllable switch 702; The first processor 701 is also configured to control the operation of the controllable switch 702 according to the control action indicated by the manual control command.

[0073] The instruction input module may include one or more of the following devices: buttons, knobs, touch screens, switches, voice input devices, gesture recognition devices, remote controls, etc.

[0074] Understandably, the controllable switch 702 can also be manually closed so that relevant personnel can quickly and effectively disconnect the controllable switch 702 in case of maintenance, abnormality, or other situations.

[0075] In some embodiments, the switch 700 is further configured to: The current on / off state of the controllable switch 702 is obtained and sent to the main power device 105 through the communication port 706, so that the main power device 105 can adjust the working mode or execute a safety protection strategy according to the current on / off state of the controllable switch 702.

[0076] The controllable switch 702 may have auxiliary measuring points. The first processor 701 can detect the on / off state of the controllable switch 702 through the auxiliary measuring points and send the current on / off state of the controllable switch 702 to the main power device 105 via DO. In addition, the first processor 701 can also determine the on / off state of the controllable switch 702 based on the current flowing through the controllable switch 702. For example, if the absolute value of the current flowing through the controllable switch 702 is greater than or equal to a preset current, the controllable switch 702 is determined to be in the closed state. If the absolute value of the current flowing through the controllable switch 702 is less than the preset current, the controllable switch 702 is determined to be in the open state.

[0077] On the one hand, after the main power device 105 sends the second control command to the first processor 701, it can determine whether the controllable switch 702 will execute the control action indicated by the second control command based on the current on / off state of the controllable switch 702 fed back by the first processor 701. If the controllable switch 702 does not execute the control action indicated by the second control command, it will implement a safety protection strategy, such as generating an alarm message or controlling each power device 100 to disconnect its own AC switch 102, thereby ensuring the reliable operation of each power device 100.

[0078] On the other hand, when the main power device 105 does not send a second control command to the first processor 701, it can adjust its own and each slave power device 106's operating mode according to the current on / off state of the controllable switch 702. Thus, in cases where the controllable switch 702 is manually switched, automatically disconnected due to short circuit, overcurrent, or the first processor 701 controls the controllable switch 702 to disconnect due to abnormal internal temperature of the switching switch 700, the power devices 100 can be triggered to adjust their operating modes in a timely manner, thereby ensuring the safe and reliable operation of each power device 100.

[0079] Secondly, this application also provides a power conversion system 800, referring to... Figure 5 It includes multiple power devices 100 and a switching switch 700 as described in any of the above embodiments. The AC output ports of each power device 100 are connected in parallel and then connected to the second port 705 of the switching switch 700. The first port 704 of the switching switch 700 is used to connect to the power grid 200. The switch 700 includes a controllable switch 702 and a first acquisition module 703. The first side of the controllable switch 702 is electrically connected to the first port 704, and the second side of the controllable switch 702 is electrically connected to the second port 705. The first acquisition module 703 is used to acquire the port electrical parameters of the first port 704. The power conversion system 800 is configured as follows: Based on the port electrical parameters collected by the first acquisition module 703, the power grid status information of the power grid 200 is determined; Based on the power grid status information, the target operating state of the power conversion system 800 is determined; under the target operating state, the power device 100 operates in the target working mode, and the controllable switch 702 is in the target on / off state; Based on the target operating status, control each power device 100 to operate in the target working mode, and control the controllable switch 702 to switch to the target on / off state.

[0080] Specifically, for any one of the multiple power devices 100, the power device 100 may include an AC output port, a second processor, and an inverter circuit 101. The AC output port is located on the AC side of the inverter circuit 101, and an AC switch 102 may be provided between the AC output port and the AC side of the inverter circuit 101. The second processor can control the operation of the inverter circuit 101.

[0081] The AC output ports of multiple power devices 100 are connected in parallel and then connected to the second port 705 of the switch 700, so that the grid-connected and off-grid modes of each power device 100 can be switched by the activation or deactivation of the controllable switch 702 in the switch 700. At the same time, the parallel connection point of the AC output ports of each power device 100 is also connected to the load 300.

[0082] Multiple power devices 100 can communicate with each other. For example, second processors among the multiple power devices 100 can communicate with each other to exchange data and / or instructions. Optionally, the multiple power devices 100 can communicate with each other via a bus. One of the power devices 100 can be the master power device 105, and the other power devices 100 can be slave power devices 106. The specific implementation of determining the master power device 105 and slave power devices 106 can be set according to actual needs. Optionally, the master power device 105 can be manually set, or the power devices 100 can compete to become the master power device 105. For example, after communication between the power devices 100 is established, each power device 100 can randomly upload its own serial number to the bus, and the power device 100 whose serial number value meets preset conditions (e.g., minimum or maximum) can become the master power device 105.

[0083] The main power device 105 can communicate with the switch 700 to receive signals or instructions sent by the switch 700, and can also send signals or instructions to the switch 700; in addition, the main power device 105 can also control the operation of each slave power device 106.

[0084] The power conversion system 800 can determine the grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703. Specifically, the grid status information can be determined directly using the port electrical parameters collected by the first acquisition module 703 via a switch 700, or the switch 700 can send the port electrical parameters collected by the first acquisition module 703 to the main power device 105, and the main power device 105 can then determine the grid status information of the power grid 200 based on these parameters. The specific configuration can be tailored to actual needs.

[0085] The power grid status information may include first status information indicating that the power grid 200 is operating normally, and may also include second status information indicating that the power grid 200 is operating abnormally. For example, if the power grid status information is the first status information (i.e., the voltage of the power grid 200 is within the preset voltage range of the power grid 200, and the frequency of the power grid 200 is within the preset frequency range of the power grid 200), it may be determined that the power grid status information changes from the first status information to the second status information, i.e., the power grid 200 enters an abnormal state, if the voltage of the power grid 200 exceeds the preset voltage range for a duration that reaches a first target duration, and / or the frequency of the power grid 200 exceeds the preset frequency range for a duration that reaches a second target duration. In addition, when the power grid status information is the second status information (i.e., the voltage of the power grid 200 exceeds the preset voltage range of the power grid 200, and the frequency of the power grid 200 exceeds the preset frequency range of the power grid 200), it can be determined that the power grid status information is switched from the second status information to the first status information when the duration of the voltage of the power grid 200 within the preset voltage range of the power grid 200 reaches the third target duration, and the duration of the frequency of the power grid 200 within the preset frequency range of the power grid 200 reaches the fourth target duration. That is, the power grid 200 returns to normal status.

[0086] After determining the grid state information of the power grid 200, the power conversion system 800 can further determine its target operating state based on the grid state information. The target operating state of the power conversion system 800 can include grid-connected mode and off-grid mode. Specifically, when the grid state information is the first state information, the target operating state of the power conversion system 800 can be grid-connected mode; when the grid state information is the second state information, the target operating state of the power conversion system 800 can be off-grid mode.

[0087] When the target operating state is grid-connected mode, the target operating mode of power device 100 is grid-connected operating mode, and the target on / off state of controllable switch 702 is switch-closed state.

[0088] When the target operating state is off-grid mode, the target operating mode of power device 100 is off-grid operating mode, and the target on / off state of controllable switch 702 is switch off state.

[0089] In the case where the grid status information of the power grid 200 is determined by the switch 700, the target operating state of the power conversion system 800 can be determined by the switch 700 based on the grid status information. Alternatively, the switch 700 can send the grid status information to the main power device 105, and the main power device 105 can determine the target operating state of the power conversion system 800 based on the grid status information. In the case where the grid status information of the power grid 200 is determined by the main power device 105, the target operating state of the power conversion system 800 can be determined by the main power device 105 based on the grid status information. Alternatively, the main power device 105 can send the grid status information to the switch 700, and the switch 700 can determine the target operating state of the power conversion system 800 based on the grid status information. No specific limitations are made here.

[0090] After determining the target operating state of the power conversion system 800, the power conversion system 800 can also control each power device 100 to operate in the target working mode and control the controllable switch 702 to switch to the target on / off state according to the target operating state of the power conversion system 800.

[0091] In this process, when the target operating state of the power conversion system 800 is determined by the main power device 105, the main power device 105 can switch its own operating mode to the target operating mode according to the target operating state, send a first control command to each slave power device 106 to instruct the power device 100 to operate in the target operating mode, so as to control each slave power device 106 to switch to the target operating mode, and send a second control command to the switching switch 700 to instruct the controllable switch 702 to switch to the target on / off state, so that the switching switch 700 controls the controllable switch 702 to switch to the target on / off state according to the second control command.

[0092] When the target operating state of the power conversion system 800 is determined by the switching switch 700, the switching switch 700 can control the controllable switch 702 to switch to the target on / off state according to the target operating state, and send a third control command to the main power device 105 to instruct the power device 100 to operate in the target operating mode, so that the main power device 105 switches its own operating mode according to the third control command, and controls each slave power device 106 to switch to the target operating mode.

[0093] Therefore, through the solution of this application embodiment, it is only necessary to connect a switching switch 700 between the parallel point of the AC output port of each power device 100 and the power grid 200, and control the on / off state of the controllable switch 702 and the working mode of each power device 100 according to the port electrical parameters collected by the first acquisition module 703 in the switching switch 700. This can realize the switching of the power conversion system 800 between grid and off-grid modes. It is not necessary to set up a grid-connected port 103 and an off-grid port 104 on the AC side of each power device 100, and it is also not necessary to configure two sets of power cables for each power device 100 to connect the power grid 200 and the load 300. This greatly reduces the cost and construction difficulty of the power conversion system 800 between grid and off-grid modes switching solution.

[0094] At the same time, by controlling the switching of the working modes of each power device 100 simultaneously, the risk of failure such as sticking of the AC switch 102 in each power device 100 due to overload can be effectively reduced.

[0095] In some embodiments, the power devices 100 are communicatively connected to each other, and the main power device 105 in each power device 100 is communicatively connected to the switching switch 700. Based on the port electrical parameters collected by the first acquisition module 703, the power grid status information of the power grid 200 is determined, including: The switching switch 700 is configured to generate feedback information based on the port electrical parameters collected by the first acquisition module 703; wherein the feedback information carries indication information indicating the operating status of the power grid 200; and the feedback information is sent to the main power device 105. The main power device 105 is configured to receive feedback information sent by the switching switch 700 and determine the power grid status information based on the indication information carried in the feedback information. Based on the power grid status information, determine the target operating state of the power conversion system 800, including: The main power device 105 is also configured to determine the target operating state of the power conversion system 800 based on the grid status information.

[0096] Specifically, during the process of determining the grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703, the switching switch 700 can be configured to generate feedback information based on the port electrical parameters collected by the first acquisition module 703, and send the feedback information to the main power device 105 through the communication port 706. The switching switch 700 can also be configured to simultaneously generate feedback information based on the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, and send the feedback information to the main power device 105 through the communication port 706.

[0097] The feedback information may include indication information indicating the operating status of the power grid 200. For example, the switch 700 may directly use the port electrical parameters collected by the first acquisition module 703 as the indication information in the feedback information. The switch 700 may also determine the power grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703, and use the power grid status information of the power grid 200 as the indication information in the feedback information.

[0098] In addition, the switching switch 700 can simultaneously use the grid status information of the grid 200 and the port electrical parameters collected by the first acquisition module 703 as indication information in the feedback information, or simultaneously use the grid status information of the grid 200 and the parameter difference between the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707 as indication information in the feedback information. This is so that when the power conversion system 800 switches to grid-connected mode, the main power device 105 can refer to the port electrical parameters collected by the first acquisition module 703, or refer to the parameter difference between the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, to adjust its own AC output and control the adjustment of the AC output of each slave power device 106.

[0099] The main power device 105 can be configured to receive feedback information sent by the switching switch 700 and determine the grid status information of the grid 200 based on the indication information carried in the feedback information. For example, if the indication information in the feedback information is the port electrical parameters collected by the first acquisition module 703, the main power device 105 can be configured to determine the grid status information of the grid 200 based on the port electrical parameters collected by the first acquisition module 703; if the indication information in the feedback information is the grid status information of the grid 200, the main power device 105 can be configured to determine the grid status information in the feedback information as the grid status information of the grid 200.

[0100] Meanwhile, during the process of determining the target operating state of the power conversion system 800 based on the grid status information, the main power device 105 can also be configured to determine the target operating state of the power conversion system 800 based on the grid status information of the grid 200, thereby enabling the target operating state of the power conversion system 800 to be determined quickly and effectively.

[0101] In some embodiments, according to the target operating state, controlling each power device 100 to operate in a target operating mode and controlling the controllable switch 702 to switch to a target on / off state includes: The main power device 105 is also configured to generate a first control command that instructs the power device 100 to operate in a target operating mode based on the target operating state, and to generate a second control command that instructs the controllable switch 702 to switch to a target on / off state; control itself to operate in the target operating mode according to the first control command, send the first control command to the slave power device 106 in each power device 100, and send the second control command to the switching switch 700; The power device 106 is configured to receive a first control command and control itself to operate in a target working mode according to the first control command; The switch 700 is configured to receive a second control command and control the controllable switch 702 to switch to the target on / off state according to the second control command.

[0102] Specifically, during the process of controlling each power device 100 to operate in the target working mode according to the target operating state of the power conversion system 800, and controlling the controllable switch 702 to switch to the target on / off state, the main power device 105 can also be configured to generate a first control command indicating that the power device 100 operates in the target working mode, and a second control command indicating that the controllable switch 702 switches to the target on / off state, based on the target operating state of the power conversion system 800.

[0103] The main power device 105 can control itself to operate in the target working mode according to the first control command, so as to realize the switching of the working mode of the main power device 105.

[0104] The master power device 105 can also send the first control command to each slave power device 106. For any slave power device 106, the slave power device 106 can be configured to receive the first control command and control itself to operate in the target working mode according to the first control command, so as to realize the switching of the working modes of each slave power device 106.

[0105] In the process of generating a first control command that instructs the power device 100 to operate in a target working mode, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100, and generate a first control command carrying the target value of the port electrical parameters of the AC output port of the power device 100, so that each power device 100 adjusts the port electrical parameters of its own AC output port to the target value when switching its own working mode according to the first control command, so as to realize the synchronous output of multiple power devices 100.

[0106] For example, when the target operating state of the power conversion system 800 is grid-connected mode, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100 based on the port electrical parameters collected by the first acquisition module 703. Alternatively, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100 based on the parameter difference between the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, as well as the port electrical parameters of its own AC output port. When the target operating state of the power conversion system 800 is off-grid mode, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100 based on the port electrical parameters of its own AC output port.

[0107] In the case where the target operating state of the power conversion system 800 is off-grid mode, the power device 106, while controlling itself to operate in the target working mode according to the first control command, can determine the controllable value of the port electrical parameters of its own AC output port based on the target value of the port electrical parameters carried in the first control command, and adjust its own AC output according to the controllable value of the port electrical parameters of its own AC output port to ensure the synchronization of the port electrical parameters of the AC output ports of each power device 100.

[0108] For example, for any slave power device 106, the controllable values ​​of the port electrical parameters of the AC output port of the slave power device 106 may include a controllable value for voltage amplitude, a controllable value for voltage frequency, and a controllable value for voltage phase. The slave power device 106 can determine the voltage amplitude from the target value of the port electrical parameters as the controllable value for voltage amplitude, determine the voltage frequency from the target value of the port electrical parameters as the controllable value for voltage frequency, and determine the controllable value for voltage phase based on the voltage phase from the target value of the port electrical parameters and the preset communication delay between the slave power device 106 and the master power device 105. The controllable value for voltage phase can lead the voltage phase from the target value of the port electrical parameters, and the lead time can be the duration of the preset communication delay, so as to ensure the synchronization of the port electrical parameters of the AC output ports of each power device 100.

[0109] The main power device 105 can also send a second control command to the switching switch 700. The switching switch 700 can be configured to receive the second control command and control the controllable switch 702 to switch to the target on / off state according to the second control command, so as to realize the state switching of the controllable switch 702.

[0110] In the case that the target operating state of the power conversion system 800 is grid-connected mode, when the switching switch 700 controls the controllable switch 702 to switch to the target on / off state according to the second control command, the controllable switch 702 can be switched to the target on / off state when the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707 are consistent. That is, the controllable switch 702 is closed to ensure reliable control of the controllable switch 702.

[0111] In practice, the main power device 105 can determine the target execution order of the first control instruction and the second control instruction based on the current operating state and the target operating state of the power conversion system 800, and generate and execute the first control instruction and the second control instruction according to the target execution order. It is understood that if the target operating state of the power conversion system 800 is the same as the current operating state, there is no need to generate and execute the first control instruction and the second control instruction.

[0112] In the case where the current operating state of the power conversion system 800 is off-grid mode and the target operating state is grid-connected mode, the target execution order of the first control instruction precedes the target execution order of the second control instruction. For example, after determining the target operating state of the power conversion system 800, the master power device 105 can generate a first control instruction instructing the power device 100 to operate in the target operating mode, control itself to operate in the target operating mode according to the first control instruction, and send the first control instruction to each slave power device 106 so that each slave power device 106 operates in the target operating mode.

[0113] Each power device 100 can also detect the port electrical parameters of its own AC output port in real time. Each slave power device 106 can also send the port electrical parameters of its own AC output port to the master power device 105. The master power device 105 can generate a second control command to indicate that the controllable switch 702 is switched to the target on / off state and send it to the switching switch 700 in response to the fact that the port electrical parameters of the AC output ports of each power device 100 are consistent with the port electrical parameters collected by the first acquisition module 703.

[0114] When the current operating state of the power conversion system 800 is standby mode and the target operating state is grid-connected mode, there is no specific limitation on the target execution order of the first control instruction and the second control instruction. The target execution order of the first control instruction can be before the target execution order of the second control instruction, or it can be after the target execution order of the second control instruction. The target execution order of the first control instruction can also be the same as the target execution order of the second control instruction.

[0115] It is understandable that when the current operating state of the power conversion system 800 is standby mode, the target operating state is grid-connected mode, and the target execution order of the first control instruction is later than the target execution order of the second control instruction, the first control instruction generated by the main power device 105 may not carry the target value of the port electrical parameters of the AC output port of the power device 100. At this time, when each power device 100 controls itself to operate in the target working mode according to the first control instruction, it can adjust the port electrical parameters of its own AC output port based on the preset grid-connected strategy so that the port electrical parameters of the AC output port of each power device 100 are consistent with the port electrical parameters of the first port 704.

[0116] When the current operating state of the power conversion system 800 is standby mode and the target operating state is off-grid mode, since the on / off state of the controllable switch 702 remains unchanged, the main power device 105 can control itself to operate in the target operating mode and send the first control command to each slave power device 106 to make each slave power device 106 operate in the target operating mode, without generating and sending a second control command to the switching switch 700. It is understood that, to ensure that the controllable switch 702 is in the off state, a second control command can also be generated and sent to the switching switch 700. In this case, there is no specific limitation on the target execution order of the first and second control commands. The target execution order of the first control command can be before the target execution order of the second control command, or it can be later than the target execution order of the second control command, or the target execution order of the first control command can be the same as the target execution order of the second control command.

[0117] When the current operating state of the power conversion system 800 is grid-connected mode and the target operating state is off-grid mode, the target execution order of the second control command precedes the target execution order of the first control command. For example, after determining the target operating state of the power conversion system 800, the main power device 105 can generate a second control command to instruct the controllable switch 702 to switch to the target on / off state, thereby controlling the controllable switch 702 to open. At the same time, the main power device 105 can also, based on the on / off state of the controllable switch 702 fed back by the switching switch 700, determine that the controllable switch 702 has been successfully opened, generate a first control command to instruct the power device 100 to operate in the target operating mode, and control itself to operate in the target operating mode according to the first control command, and send the first control command to each slave power device 106 so that each slave power device 106 operates in the target operating mode.

[0118] In addition, each power device 100 can also judge the grid status information of the grid 200 in real time when operating in grid-connected mode. When each slave power device 106 identifies the grid status information as the second status information indicating that the grid 200 is operating abnormally, it can also send the grid 200 abnormal information to the main power device 105. The main power device 105 can generate a first control command indicating that the power device 100 is operating in the target operating mode and a second control command indicating that the controllable switch 702 is switched to the target on / off state when the grid 200 is abnormal.

[0119] In some embodiments, the main power device 105 is specifically configured to, when the current operating state of the power conversion system 800 is inconsistent with the target operating state, generate a first control command indicating that the power device 100 operates in a target operating mode, and generate a second control command indicating that the controllable switch 702 switches to a target on / off state.

[0120] Specifically, after determining the target operating state of the power conversion system 800, the main power device 105 can also determine whether the current operating state of the power conversion system 800 is consistent with the target operating state of the power conversion system 800. If they are consistent, there is no need to generate the first control command and the second control command, so as to keep the working mode of each power device 100 unchanged and keep the on / off state of the controllable switch 702 unchanged.

[0121] If the two are inconsistent, a first control command and a second control command are generated according to the target operating state to achieve effective switching of the operating state of the power conversion system 800.

[0122] In some embodiments, the power devices 100 are communicatively connected to each other, and the main power device 105 in each power device 100 is communicatively connected to the switching switch 700. Based on the port electrical parameters collected by the first acquisition module 703, the power grid status information of the power grid 200 is determined, including: The switching switch 700 is configured to determine the power grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703. Based on the power grid status information, determine the target operating state of the power conversion system 800, including: The switching switch 700 is also configured to determine the target operating state of the power conversion system 800 based on the grid status information.

[0123] Specifically, in the process of determining the grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703, the switching switch 700 can be configured to determine the grid status information of the power grid 200 based on the port electrical parameters collected by the first acquisition module 703.

[0124] In addition, during the process of determining the target operating state of the power conversion system 800 based on the power grid status information, the switching switch 700 is also configured to determine the target operating state of the power conversion system 800 based on the power grid status information. This allows the switching switch 700 to quickly and effectively determine the target operating state of the power conversion system 800, thereby controlling each power device 100 to quickly and effectively switch its operating mode.

[0125] In some embodiments, according to the target operating state, controlling each power device 100 to operate in a target operating mode and controlling the controllable switch 702 to switch to a target on / off state includes: The switching switch 700 is configured to generate a third control command indicating that the power device 100 is operating in a target working mode according to the target operating state; send the third control command to the main power device 105; and control the controllable switch 702 to switch to the target on / off state. The main power device 105 is configured to receive a third control command and control itself to operate in a target working mode according to the third control command; and to send the third control command to the slave power devices 106 in each power device 100; The power device 106 is configured to receive a third control command and control itself to operate in the target working mode in accordance with the third control command.

[0126] Specifically, during the process of controlling each power device 100 to operate in the target working mode according to the target operating state of the power conversion system 800, and controlling the controllable switch 702 to switch to the target on / off state, the switching switch 700 can be configured to generate a third control command indicating that the power device 100 operates in the target working mode based on the target operating state of the power conversion system 800, and send the third control command to the main power device 105, and control the controllable switch 702 to switch to the target on / off state.

[0127] Among them, the main power device 105 can control itself to operate in the target working mode according to the third control command, so as to realize the switching of the working mode of the main power device 105.

[0128] Meanwhile, the main power device 105 can also send a third control command to each slave power device 106. For any slave power device 106, the slave power device 106 can be configured to receive the third control command and control itself to operate in the target working mode according to the third control command, so as to realize the switching of the working modes of each slave power device 106.

[0129] In the process of generating the third control command, the switching switch 700 can also carry the port electrical parameters collected by the first acquisition module 703, or the parameter difference between the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, so that when the power conversion system 800 switches to grid-connected mode, the main power device 105 can refer to the port electrical parameters collected by the first acquisition module 703, or the parameter difference between the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, to adjust its own AC output and control the adjustment of the AC output of each slave power device 106.

[0130] Optionally, during the process of sending the third control command to each slave power device 106, the master power device 105 may also determine the target value of the port electrical parameters of the AC output port of the power device 100, and carry the target value of the port electrical parameters of the AC output port of the power device 100 in the third control command, so that each slave power device 106 adjusts the port electrical parameters of its own AC output port to the target value during the process of switching its own working mode according to the third control command.

[0131] For example, when the target operating state of the power conversion system 800 is grid-connected mode, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100 based on the port electrical parameters collected by the first acquisition module 703. Alternatively, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100 based on the parameter difference between the port electrical parameters collected by the first acquisition module 703 and the port electrical parameters collected by the second acquisition module 707, as well as the port electrical parameters of its own AC output port. When the target operating state of the power conversion system 800 is off-grid mode, the main power device 105 can determine the target value of the port electrical parameters of the AC output port of the power device 100 based on the port electrical parameters of its own AC output port.

[0132] In the case where the target operating state of the power conversion system 800 is off-grid mode, the power device 106, while controlling itself to operate in the target working mode according to the third control command, can determine the controllable value of the port electrical parameters of its own AC output port based on the target value of the port electrical parameters carried in the third control command, and adjust its own AC output according to the controllable value of the port electrical parameters of its own AC output port to ensure the synchronization of the port electrical parameters of the AC output ports of each power device 100.

[0133] For example, for any slave power device 106, the controllable values ​​of the port electrical parameters of the AC output port of the slave power device 106 may include a controllable value for voltage amplitude, a controllable value for voltage frequency, and a controllable value for voltage phase. The slave power device 106 can determine the voltage amplitude from the target value of the port electrical parameters as the controllable value for voltage amplitude, determine the voltage frequency from the target value of the port electrical parameters as the controllable value for voltage frequency, and determine the controllable value for voltage phase based on the voltage phase from the target value of the port electrical parameters and the preset communication delay between the slave power device 106 and the master power device 105. The controllable value for voltage phase can lead the voltage phase from the target value of the port electrical parameters, and the lead time can be the duration of the preset communication delay, so as to ensure the synchronization of the port electrical parameters of the AC output ports of each power device 100.

[0134] In the case that the target operating state of the power conversion system 800 is grid-connected mode, the switching switch 700 can control the controllable switch 702 to switch to the target on / off state during the process of controlling the controllable switch 702 to switch to the target on / off state. That is, it can control the controllable switch 702 to close. Alternatively, it can control the controllable switch 702 to close when it receives a feedback signal from the main power device 105 indicating that the port electrical parameters of the AC output ports of each power device 100 are consistent with the port electrical parameters collected by the first acquisition module 703. This ensures reliable control of the controllable switch 702.

[0135] In practical implementation, the switching switch 700 can determine the target execution sequence for controlling each power device 100 to operate in the target working mode and controlling the controllable switch 702 to switch to the target on / off state based on the current operating state and target operating state of the power conversion system 800. Following this target execution sequence, it generates and sends a third control command and controls the controllable switch 702 to switch to the target on / off state. It is understood that when the target operating state of the power conversion system 800 is the same as the current operating state, there is no need to control the power devices 100 to switch operating modes, nor is it necessary to control the controllable switch 702.

[0136] Optionally, the switching switch 700 can determine the current operating state of the power conversion system 800 based on one or more of the port electrical parameters collected by the first acquisition module 703, the port electrical parameters collected by the second acquisition module 707, and the current on / off state of the controllable switch 702.

[0137] For example, if the voltage amplitude in the port electrical parameters collected by the second acquisition module 707 is greater than a preset voltage threshold, and the port electrical parameters collected by the second acquisition module 707 are inconsistent with the port electrical parameters collected by the first acquisition module 703, the current operating state of the power conversion system 800 is determined to be off-grid mode. If the voltage amplitude in the port electrical parameters collected by the second acquisition module 707 is greater than a preset voltage threshold, and the port electrical parameters collected by the second acquisition module 707 are consistent with the port electrical parameters collected by the first acquisition module 703, the current operating state of the power conversion system 800 is determined to be grid-connected mode. If the voltage amplitude in the port electrical parameters collected by the second acquisition module 707 is less than or equal to a preset voltage threshold, the current operating state of the power conversion system 800 is determined to be standby mode.

[0138] Additionally, when the current on / off state of the controllable switch 702 is in the energized state, the current operating state of the power conversion system 800 can be determined to be grid-connected mode. When the current on / off state of the controllable switch 702 is in the off state, the current operating state of the power conversion system 800 can be further determined based on the relationship between the voltage amplitude in the port electrical parameters collected by the second acquisition module 707 and the preset voltage threshold. Specifically, when the voltage amplitude in the port electrical parameters collected by the second acquisition module 707 is greater than the preset voltage threshold, the current operating state of the power conversion system 800 is determined to be off-grid mode. When the voltage amplitude in the port electrical parameters collected by the second acquisition module 707 is less than or equal to the preset voltage threshold, the current operating state of the power conversion system 800 is determined to be standby mode.

[0139] In the case where the current operating state of the power conversion system 800 is off-grid mode and the target operating state is grid-connected mode, the target execution sequence of controlling each power device 100 to operate in the target operating mode precedes the target execution sequence of controlling the controllable switch 702 to switch to the target on / off state. For example, after determining the target operating state of the power conversion system 800, the switching switch 700 can generate a third control command instructing the power device 100 to operate in the target operating mode and send it to the main power device 105, so that each power device 100 controls itself to operate in the target operating mode according to the third control command.

[0140] Each power device 100 can also detect the port electrical parameters of its own AC output port in real time. Each slave power device 106 can also send the port electrical parameters of its own AC output port to the master power device 105. The master power device 105 can send a feedback signal to the switching switch 700 in response to the fact that the port electrical parameters of the AC output ports of each power device 100 are consistent with the port electrical parameters collected by the first acquisition module 703.

[0141] The switching switch 700 can control the controllable switch 702 to switch to the target on / off state after receiving a feedback signal from the main power device 105. Additionally, the switching switch 700 can also control the controllable switch 702 to switch to the target on / off state when the port electrical parameters acquired by the first acquisition module 703 and the second acquisition module 707 are consistent.

[0142] When the current operating state of the power conversion system 800 is standby mode and the target operating state is grid-connected mode, there is no specific limitation on the execution order of controlling each power device 100 to operate in the target working mode and controlling the controllable switch 702 to switch to the target on / off state. It is possible to first generate and send the third control command to the main power device 105, and then control the controllable switch 702 to switch to the target on / off state. Alternatively, it is possible to first control the controllable switch 702 to switch to the target on / off state, and then generate and send the third control command to the main power device 105. Or, it is possible to control the controllable switch 702 to switch to the target on / off state at the same time as generating and sending the third control command to the main power device 105.

[0143] It is understandable that when the current operating state of the power conversion system 800 is standby mode and the target operating state is grid-connected mode, and the controllable switch 702 is first switched to the target on / off state before the third control command is generated and sent to the main power device 105, each power device 100 can adjust the port electrical parameters of its own AC output port based on the preset grid-connected strategy while controlling itself to operate in the target working mode according to the third control command, without having to consider the port electrical parameters collected by the first acquisition module 703 sent by the switch 700.

[0144] When the power conversion system 800 is currently in standby mode and the target operating state is off-grid mode, since the on / off state of the controllable switch 702 remains unchanged, only the third control command needs to be generated and sent to the main power device 105 to control each power device 100 to operate in standby mode. Alternatively, to ensure that the controllable switch 702 is in the off state, the switching switch 700 can also control the controllable switch 702 to switch to the target on / off state. In this case, there is no specific limitation on the execution order of controlling each power device 100 to operate in the target operating mode and controlling the controllable switch 702 to switch to the target on / off state. The third control command can be generated and sent to the main power device 105 first, and then the controllable switch 702 can be switched to the target on / off state. Alternatively, the controllable switch 702 can be switched to the target on / off state first, and then the third control command can be generated and sent to the main power device 105. Or, the controllable switch 702 can be switched to the target on / off state simultaneously with the generation and sending of the third control command to the main power device 105.

[0145] When the current operating state of the power conversion system 800 is grid-connected mode and the target operating state is off-grid mode, the target execution sequence of controlling the controllable switch 702 to switch to the target on / off state takes precedence over the target execution sequence of controlling each power device 100 to operate in the target operating mode. For example, after determining the target operating state of the power conversion system 800, the switching switch 700 can control the controllable switch 702 to switch to the target on / off state, detect the current on / off state of the controllable switch 702, and, when the current on / off state of the controllable switch 702 is off, generate and send a third control command to the main power device 105 so that each power device 100 operates in the target operating mode.

[0146] In some embodiments, a circuit breaker is provided between the AC output port of each power device 100 and the second port 705. The circuit breaker is used to disconnect when the first target current is greater than the preset current. The first target current is the current flowing through the circuit breaker.

[0147] Specifically, for any power device 100 among the power devices 100, a corresponding circuit breaker can be installed between the AC output port of the power device 100 and the parallel connection point of the AC output ports of each power device 100. When the first target current flowing through the circuit breaker is greater than the preset current, the circuit breaker can automatically disconnect, so that when a short circuit or overcurrent occurs in a single power device 100, the power device 100 can be automatically disconnected from the power conversion system 800 to prevent the fault from spreading.

[0148] In addition, each power device 100 can also monitor the port electrical parameters of its own AC output port in real time, and each slave power device 106 can also send the port electrical parameters of its own AC output port to the master power device 105. For any power device 100, the port electrical parameters of its AC output port can include voltage signals and current signals, etc. The voltage signal can include voltage amplitude, voltage frequency, and voltage phase. The master power device 105 can also determine the abnormally disconnected power devices 100 based on the port electrical parameters of the AC output ports of each power device 100, including itself. For example, a power device 100 with a voltage amplitude greater than a preset voltage threshold and a current less than a preset current threshold can be determined as an abnormally disconnected power device 100. Furthermore, when the master power device 105 identifies an abnormally disconnected power device 100, it can also adjust the output power of each power device 100 according to the power demand to maintain the overall operational stability of the power conversion system 800.

[0149] Corresponding to the power conversion system 800 described above, this application embodiment also provides a power supply control method for the power conversion system 800. The power conversion system 800 includes a switching switch 700 and multiple power devices 100. The AC output ports of each power device 100 are connected in parallel and then connected to the second port 705 of the switching switch 700. The first port 704 of the switching switch 700 is used to connect to the power grid 200. The switching switch 700 includes a controllable switch 702 and a first acquisition module 703. The first side of the controllable switch 702 is electrically connected to the first port 704, and the second side of the controllable switch 702 is electrically connected to the second port 705. The first acquisition module 703 is used to acquire the port electrical parameters of the first port 704. (Refer to...) Figure 6 The method includes: S601. Based on the port electrical parameters collected by the first acquisition module 703, determine the power grid status information of the power grid 200; S602. Based on the power grid status information, determine the target operating state of the power conversion system 800; under the target operating state, the power device 100 operates in the target working mode, and the controllable switch 702 in the switching switch 700 is in the target on / off state. S603. Based on the target operating state, control each power device 100 to operate in the target working mode, and control the controllable switch 702 to switch to the target on / off state.

[0150] In some embodiments, the power devices 100 are communicatively connected to each other, and the main power device 105 in each power device 100 is communicatively connected to the switching switch 700. Based on the port electrical parameters collected by the first acquisition module 703, the power grid status information of the power grid 200 is determined, including: The switching switch 700 generates feedback information based on the port electrical parameters collected by the first acquisition module 703, and sends the feedback information to the main power device 105; wherein, the feedback information carries indication information indicating the operating status of the power grid 200; The main power device 105 receives the feedback information sent by the switching switch 700 and determines the power grid status information based on the indication information carried in the feedback information. Based on the power grid status information, determine the target operating state of the power conversion system 800, including: The main power device 105 determines the target operating state of the power conversion system 800 based on the power grid status information.

[0151] In some embodiments, according to the target operating state, controlling each power device 100 to operate in a target operating mode and controlling the controllable switch 702 to switch to a target on / off state includes: Based on the target operating state, the main power device 105 generates a first control command that instructs the power device 100 to operate in the target working mode, and generates a second control command that instructs the controllable switch 702 to switch to the target on / off state. It controls itself to operate in the target working mode according to the first control command, sends the first control command to the slave power device 106 in each power device 100, and sends the second control command to the switching switch 700. By receiving a first control command from the power device 106, and controlling itself to operate in the target working mode according to the first control command; The second control command is received by the switch 700, and the controllable switch 702 is switched to the target on / off state according to the second control command.

[0152] In some embodiments, the main power device 105 generates a first control command, based on a target operating state, instructing the power device 100 to operate in a target operating mode, and generates a second control command, instructing the controllable switch 702 to switch to a target on / off state, including: When the current operating state of the power conversion system 800 is inconsistent with the target operating state, the main power device 105 generates a first control command indicating that the power device 100 operates in the target operating mode, and generates a second control command indicating that the controllable switch 702 switches to the target on / off state, based on the target operating state.

[0153] In some embodiments, the power devices 100 are communicatively connected to each other, and the main power device 105 in each power device 100 is communicatively connected to the switching switch 700. Based on the port electrical parameters collected by the first acquisition module 703, the power grid status information of the power grid 200 is determined, including: The power grid status information of the power grid 200 is determined by the switching switch 700 based on the port electrical parameters collected by the first acquisition module 703. Based on the power grid status information, determine the target operating state of the power conversion system 800, including: The target operating state of the power conversion system 800 is determined by the switch 700 based on the grid status information.

[0154] In some embodiments, according to the target operating state, controlling each power device 100 to operate in a target operating mode and controlling the controllable switch 702 to switch to a target on / off state includes: Based on the target operating state, the switch 700 generates a third control command indicating that the power device 100 is operating in the target working mode; sends the third control command to the main power device 105; and controls the controllable switch 702 to switch to the target on / off state. The main power device 105 receives the third control command and controls itself to operate in the target working mode according to the third control command, and sends the third control command to the slave power device 106 in each power device 100. By receiving a third control command from the power device 106, the device controls itself to operate in the target working mode according to the third control command.

[0155] In some embodiments, the target operating state is grid-connected mode, the target working mode is grid-connected working mode, and the target on / off state is switch-on state. The target operating state is off-grid mode, the target working mode is off-grid working mode, and the target on / off state is switch off.

[0156] In some embodiments, this embodiment also provides a computer-readable storage medium, such as a floppy disk, optical disk, hard disk, flash memory, USB flash drive, SD (Secure Digital Memory Card), MMC (Multimedia Card), etc., in which one or more instructions implementing the above steps are stored. When these one or more instructions are executed by one or more processors, the processors execute the power supply control method of the power conversion system 800 described above. For specific implementation details, please refer to the foregoing description; further elaboration is not provided here.

[0157] In addition to the methods and devices described above, embodiments of this application may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the power supply control method of the power conversion system 800 according to various embodiments of this application as described above.

[0158] Computer program products can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0159] Those skilled in the art will understand that the contents disclosed herein can be varied and modified in many ways. For example, the various devices or components described above can be implemented in hardware, or in software, firmware, or a combination of some or all of the three.

[0160] Furthermore, while this disclosure makes various references to certain elements of systems according to embodiments of this disclosure, any number of different elements may be used and operated on clients and / or servers. Elements are merely illustrative, and different aspects of the system and method may use different elements.

[0161] This disclosure uses flowcharts to illustrate the steps of a method according to embodiments of this disclosure. It should be understood that the preceding or following steps are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes.

[0162] Those skilled in the art will understand that all or part of the steps in the above methods can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium, such as a read-only memory. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Accordingly, each module / unit in the above embodiments can be implemented in hardware or as a software functional module. This disclosure is not limited to any particular combination of hardware and software.

[0163] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0164] The foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A power conversion system, characterized in that, It includes a switching switch and multiple power devices, wherein the AC output ports of each power device are connected in parallel and then connected to the second port of the switching switch; the first port of the switching switch is used to connect to the power grid. The switching switch includes a controllable switch and a first acquisition module. The first side of the controllable switch is electrically connected to the first port, and the second side of the controllable switch is electrically connected to the second port. The first acquisition module is used to acquire the port electrical parameters of the first port. The power conversion system is configured as follows: Based on the port electrical parameters collected by the first acquisition module, the power grid status information of the power grid is determined; Based on the power grid status information, the target operating state of the power conversion system is determined; under the target operating state, the power equipment operates in the target working mode, and the controllable switch is in the target on / off state; Based on the target operating state, control each of the power devices to operate in the target working mode, and control the controllable switch to switch to the target on / off state.

2. The power conversion system according to claim 1, characterized in that, The power devices are communicatively connected to each other, and the main power device in each power device is communicatively connected to the switching switch; The process of determining the power grid status information based on the port electrical parameters collected by the first acquisition module includes: The switching switch is configured to generate feedback information based on the port electrical parameters collected by the first acquisition module; wherein the feedback information carries indication information indicating the power grid operating status; and the feedback information is sent to the main power device. The main power device is configured to receive the feedback information sent by the switching switch, and determine the power grid status information according to the indication information carried in the feedback information; Determining the target operating state of the power conversion system based on the power grid status information includes: The main power device is also configured to determine the target operating state of the power conversion system based on the power grid status information.

3. The power conversion system according to claim 2, characterized in that, The step of controlling each of the power devices to operate in the target working mode according to the target operating state, and controlling the controllable switch to switch to the target on / off state, includes: The main power device is further configured to generate a first control command instructing the power device to operate in the target working mode based on the target operating state, and to generate a second control command instructing the controllable switch to switch to the target on / off state; control itself to operate in the target working mode according to the first control command, send the first control command to the slave power devices among the power devices, and send the second control command to the switching switch; The power device is configured to receive the first control command and control itself to operate in the target working mode according to the first control command; The switching switch is configured to receive the second control command and control the controllable switch to the target on / off state according to the second control command.

4. The power conversion system according to claim 3, characterized in that, The main power device is specifically configured to, when the current operating state of the power conversion system is inconsistent with the target operating state, generate a first control command instructing the power device to operate in the target operating mode, and generate a second control command instructing the controllable switch to switch to the target on / off state.

5. The power conversion system according to claim 1, characterized in that, The power devices are communicatively connected to each other, and the main power device in each power device is communicatively connected to the switching switch; The process of determining the power grid status information based on the port electrical parameters collected by the first acquisition module includes: The switching switch is configured to determine the power grid status information based on the port electrical parameters collected by the first acquisition module. Determining the target operating state of the power conversion system based on the power grid status information includes: The switching switch is also configured to determine the target operating state of the power conversion system based on the power grid status information.

6. The power conversion system according to claim 5, characterized in that, The step of controlling each of the power devices to operate in the target working mode according to the target operating state, and controlling the controllable switch to switch to the target on / off state, includes: The switching switch is configured to generate a third control command that instructs the power device to operate in the target operating mode based on the target operating state; send the third control command to the main power device; and control the controllable switch to switch to the target on / off state. The main power device is configured to receive the third control command and control itself to operate in the target working mode according to the third control command; and to send the third control command to the slave power devices among the power devices. The power device is configured to receive the third control command and control itself to operate in the target operating mode according to the third control command.

7. The power conversion system according to any one of claims 1 to 6, characterized in that, The target operating state is grid-connected mode, the target working mode is grid-connected working mode, and the target on / off state is switch-on state; The target operating state is offline mode, the target working mode is offline working mode, and the target on / off state is switch off state.

8. The power conversion system according to any one of claims 1 to 6, characterized in that, Each of the power devices is equipped with a circuit breaker between its AC output port and the second port. The circuit breaker is used to disconnect when the first target current is greater than the preset current. The first target current is the current flowing through the circuit breaker.

9. The power conversion system according to any one of claims 1 to 6, characterized in that, The switching switch further includes a second acquisition module, which is used to acquire the port electrical parameters of the second port; The power conversion system is configured as follows: Based on the target operating state, the port electrical parameters collected by the first acquisition module and the port electrical parameters collected by the second acquisition module, the power devices are controlled to operate in the target operating mode, and the controllable switch is controlled to switch to the target on / off state.

10. The power conversion system according to any one of claims 1 to 6, characterized in that, The switching switch also includes an auxiliary power circuit; The auxiliary power source circuit includes an auxiliary power source input terminal, a conversion circuit, and an auxiliary power source output terminal. The auxiliary power input terminal is electrically connected to the first port and / or the second port; The conversion circuit is used to convert the AC power input at the auxiliary source input terminal into DC power and output it from the auxiliary source output terminal. The auxiliary power source output terminal is electrically connected to the power supply port of the switching switch.

11. The power conversion system according to claim 10, characterized in that, The switching switch includes at least two of the auxiliary power circuits; Wherein, at least one of the auxiliary power source circuits has its auxiliary power source input terminal electrically connected to the first port; and at least one of the auxiliary power source circuits has its auxiliary power source input terminal electrically connected to the second port.

12. The power conversion system according to claim 10, characterized in that, The switching switch also includes a power output port, which is electrically connected to the auxiliary power output terminal.

13. The power conversion system according to claim 10, characterized in that, The switching switch further includes a gating circuit, and the auxiliary source input terminal is electrically connected to the first port and the second port through the gating circuit; The gating circuit includes a first gating input terminal, a second gating input terminal, a gating output terminal, and a gating control terminal. The first strobe input terminal is electrically connected to the first port, the second strobe input terminal is electrically connected to the second port, the strobe output terminal is electrically connected to the auxiliary source input terminal, and the strobe control terminal is electrically connected to either the first port or the second port. The gating circuit is used to connect the gating output terminal to the first gating input terminal, or connect the gating output terminal to the second gating input terminal, based on the relationship between the input voltage of the gating control terminal and the preset voltage.

14. The power conversion system according to any one of claims 1 to 6, characterized in that, The switching device also includes a DC power supply, the output port of which is electrically connected to the power supply port of the switching device.

15. The power conversion system according to any one of claims 1 to 6, characterized in that, The switch also includes a power input port, which is electrically connected to the power supply port of the switch. The power input port is used to connect to a power supply.

16. The power conversion system according to any one of claims 1 to 6, characterized in that, The switching switch further includes a current sensor and / or a current input port, wherein the current sensor is disposed between the first side of the controllable switch and the first port, and is used to detect current signals; The current input port is used to receive current signals detected by an external current sensor, including current signals flowing through the controllable switch and / or current signals from external devices.

17. The power conversion system according to any one of claims 1 to 6, characterized in that, The controllable switch includes a controllable circuit breaker, which is used to disconnect when a second target current is greater than a preset current, wherein the second target current is the current flowing through the controllable circuit breaker.

18. The power conversion system according to any one of claims 1 to 6, characterized in that, The switching switch also includes a temperature sensor for detecting temperature signals within the switching switch; The switch is also configured to control the controllable switch to open when the temperature signal detected by the temperature sensor is greater than a preset temperature.

19. A power supply control method for a power conversion system, the power conversion system including a switching switch and multiple power devices, wherein the AC output ports of each power device are connected in parallel and then connected to a second port of the switching switch; the first port of the switching switch is used to connect to the power grid; the switching switch includes a controllable switch and a first acquisition module, wherein a first side of the controllable switch is electrically connected to the first port, and a second side of the controllable switch is electrically connected to the second port; The first acquisition module is used to acquire the port electrical parameters of the first port; the method includes: Based on the port electrical parameters collected by the first acquisition module, the power grid status information of the power grid is determined; Based on the power grid status information, the target operating state of the power conversion system is determined; under the target operating state, the power equipment operates in the target working mode, and the controllable switch in the switching switch is in the target on / off state; Based on the target operating state, control each of the power devices to operate in the target working mode, and control the controllable switch to switch to the target on / off state.

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