Power system

Abstract

The present application relates to a power system, comprising: an inverter, which comprises an inverter control circuit and an inverter circuit; and a wiring control assembly, which comprises a wiring control module and a switch module, wherein the switch module is connected to both the inverter circuit and an external power supply network, a power supply path between the switch module and the inverter circuit is used for connecting a load, and the wiring control module is configured to start, when the external power supply network is abnormal, to control the switch module to disconnect, and communicate with the inverter control circuit, such that the inverter control circuit controls the inverter circuit to stop outputting a power supply voltage, and the inverter control circuit is further configured to control the output power supply voltage of the inverter circuit when the switch module is completely in a disconnected state, so as to supply power to the load, such that the load is not affected by a sudden power failure or fault of an external power network, and can continue to be powered on and operate under the action of the inverter, thereby improving the effectiveness of the load being continuously supplied with power.

Description

Power System

[0001] This application claims priority to the Chinese patent application with application number 202410091089.0 and application name “Power System” filed with the State Intellectual Property Office of China on January 22, 2024, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of photovoltaic storage systems, and in particular to a power system. Background Art

[0003] In some regions (such as North America), household loads are large, typically including appliances, heat pumps, charging stations, and other devices. The household power switch is 200A. In such scenarios, an external power network (such as the grid or generator power network) is typically used to power the household loads.

[0004] However, in the process of using an external power grid to supply power to household loads, when the external power network is out of power or fails, the usability of the household loads will be affected.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide a power system that can combine an inverter with an external power supply network. In the event of a power outage or failure in the external power network, the inverter can be switched to power the household loads, thereby improving the effectiveness of the continuous power supply to the loads.

[0007] A power system comprises: an inverter, the inverter comprising an inverter control circuit and an inverter circuit; a wiring control assembly comprising a wiring control module and a switch module; wherein the switch module is respectively connected to the inverter circuit and an external power network, and the power supply path between the switch module and the inverter circuit is used to connect a load, wherein the wiring control module is respectively connected to the inverter control circuit and the switch module; wherein the wiring control module is used to control the switch module to disconnect when the external power network is abnormal, and to communicate with the inverter control circuit so that the inverter control circuit controls the inverter circuit to stop outputting a power supply voltage; the control inverter circuit is used to control the inverter circuit to output a power supply voltage to supply power to the load when the switch module is completely in a disconnected state.

[0008] In one embodiment, the wiring control component further includes: an interface module, a first end of the interface module is connected to the switch module, and a second end of the interface module is used to connect to the external power network; wherein, the wiring control module is also used to send the electrical parameters of the interface module to the inverter control circuit when the switch module is completely in the disconnected state and the electrical parameters of the interface module are normal; the inverter control circuit is also used to control the inverter circuit to adjust the electrical parameters of the supply voltage to adapt to the electrical parameters of the interface module, and output the adaptation result to the wiring control module, so that the wiring control module controls the switch module to be in the on state, so that the external power network supplies power to the load.

[0009] In one embodiment, after the wiring control module controls the switch module to be in the on state, it outputs a mode switching instruction to the inverter control circuit, so that the inverter control circuit controls the inverter circuit to stop outputting the power supply voltage, switches the operating mode of the inverter circuit, and starts operating in the switched operating mode.

[0010] In one embodiment, the wiring control module includes: a sampling control unit, connected to the interface module and the switch module respectively, for collecting the electrical parameters of the interface module and the on-off status information of the switch module, and controlling the on-off state of the switch module; a first signal processing unit, connected to the sampling control unit and the inverter control circuit respectively, for determining whether the electrical parameters of the interface module are abnormal based on the electrical parameters, and when the electrical parameters are abnormal, causing the sampling control unit to start controlling the switch module to disconnect and output first status information to the inverter control circuit; and also for outputting second status information to the inverter control circuit when the switch module is completely in the disconnected state; wherein the first status information is used to instruct the inverter control circuit to control the inverter circuit to stop outputting the power supply voltage, and the second status information is used to instruct the inverter control circuit to control the output power supply voltage of the inverter circuit to power the load.

[0011] In one embodiment, the first signal processing unit is further used to output third state information to the inverter control circuit when the switch module is completely in the disconnected state and the electrical parameters of the interface module are normal, and the third state information is used to instruct the inverter control circuit to control and adjust the electrical parameters of the supply voltage to adapt to the electrical parameters of the interface module carried by the third state information; the first signal processing unit is also used to receive the adaptation result output by the inverter control circuit, and according to the adaptation result, enable the sampling control unit to control the switch module to be in the on state, so that the external power network supplies power to the load.

[0012] In one embodiment, the inverter control circuit includes: a second signal processing unit connected to the inverter circuit and the second signal processing unit respectively, wherein the second signal processing unit is connected to the first signal processing unit via a CAN bus.

[0013] In one embodiment, the wiring control module further includes: a first communication unit; the inverter control circuit further includes: a second communication unit, wherein the first communication unit and the second communication unit communicate via ARM.

[0014] In one embodiment, the power system includes multiple interface modules and multiple switch modules, and the wiring control module is respectively connected to the inverter control circuit, each switch module, and each interface module; wherein each interface module is used to connect to a different type of external power network, each interface module is connected to the inverter circuit via a switch module, and each interface module is connected to a different switch module; at the same time, the target switch module is in the on state so that the target external power network supplies power to the load, and the target switch module is one of the multiple switch modules, and the wiring control module is used to control the on and off state of the target switch module.

[0015] In one embodiment, the multiple interface modules include: a grid port module for connecting to a grid; and a generator interface module for connecting to a generator power network. In one embodiment, the wiring control module is further configured to, when the switch module is completely disconnected and the electrical parameters of the generator interface module are normal, transmit the electrical parameters of the generator interface module to the inverter control circuit. The inverter control circuit is further configured to control the inverter circuit to adjust the electrical parameters of the supply voltage to match the electrical parameters of the generator interface module, and output the adaptation results to the wiring control module, so that the wiring control module controls the switch module to be in a conductive state, thereby allowing the generator power network to supply power to the load.

[0016] In one embodiment, during the process of the generator power network supplying power to the load, the wiring control module is also used to control the switch module to start disconnecting when the electrical parameters of the grid port module are normal, and communicate with the inverter control circuit so that the inverter control circuit controls the inverter circuit to stop outputting the supply voltage, and when the switch module is completely in the disconnected state, send the electrical parameters of the grid port module to the inverter control circuit; the inverter control circuit is also used to control the inverter circuit to adjust the electrical parameters of the supply voltage to adapt to the electrical parameters of the grid port module, and output the adaptation result to the wiring control module so that the wiring control module controls the switch module to be in the on state so that the grid supplies power to the load.

[0017] In one embodiment, the inverter further includes: a detection circuit, wherein the first and second ends of the detection circuit are used to be connected in parallel with the switch module, and the third end of the detection circuit is connected to the inverter control circuit, and the detection circuit is used to detect the on-off state of the switch module and send the detected on-off state to the inverter control circuit.

[0018] In one embodiment, the detection circuit is specifically used to detect the on-off state of the switch module and obtain a level value corresponding to the on-off state of the switch module; and send the level value to the inverter control circuit; the inverter control circuit is also used to determine the on-off state of the switch module based on the received level value.

[0019] In one embodiment, when the detection circuit detects that the state of the switch module is an open state, the detection circuit obtains a first level value corresponding to the open state, and when the detection circuit detects that the state of the switch module is a closed state, the detection circuit obtains a second level value corresponding to the closed state; wherein, the control inverter circuit is used to determine that the state of the switch module is an open state when the first level value is received, and to determine that the state of the switch module is an on state when the second level value is received.

[0020] In one embodiment, the inverter further includes: a relay array, arranged on the power supply path between the inverter circuit and the switch module, and the relay array is used to turn on or off the power supply path of the inverter circuit under the control of the inverter control circuit.

[0021] In one embodiment, the inverter further includes: a boost circuit, wherein the input end of the boost circuit is used to receive the photovoltaic voltage, and the output end of the boost circuit is connected to the input end of the inverter circuit; and a buck-boost circuit, wherein the input end of the boost circuit is used to receive the battery voltage, and the output end of the buck-boost circuit is connected to the input end of the inverter circuit.

[0022] In one embodiment, the power system includes: a plurality of inverters; wherein, the inverter control circuit in each inverter is respectively connected to the wiring control module, and the working state of each inverter control circuit is the same; the inverter circuit in each inverter is respectively connected to the switch module and the load.

[0023] The above-mentioned power system includes: an inverter and a wiring control component, wherein the inverter includes an inverter control circuit and an inverter circuit, and the wiring control component includes a wiring control module and a switch module; wherein the external power network is connected to the load via the switch module, and the electric energy provided by the external power network can be transmitted to the load. In addition, the inverter circuit can also be directly connected to the load, and the electric energy output by the inverter circuit can be transmitted to the load. The wiring control module is used to control the switch module to start disconnecting when the external power network is out of power or fails, and communicate with the inverter control circuit so that the inverter control circuit controls the inverter circuit to stop outputting the power supply voltage, thereby controlling the inverter circuit to have zero output. In addition, the inverter control circuit can also output the power supply voltage to supply power to the load when the switch module is completely in the disconnected state, thereby realizing switching between on and off the grid. In this way, the load will not be affected by the sudden power outage or failure of the external power network, and can continue to be powered on and work under the action of the inverter, thereby improving the effectiveness of the load being continuously powered. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] FIG1 is a structural block diagram of a power system according to an embodiment;

[0026] FIG2 is a second structural block diagram of a power system according to an embodiment;

[0027] FIG3 is a third structural block diagram of a power system according to an embodiment;

[0028] FIG4 is a fourth structural block diagram of a power system according to an embodiment;

[0029] FIG5 is a fifth structural block diagram of a power system according to an embodiment;

[0030] FIG6 is a sixth structural block diagram of a power system according to an embodiment;

[0031] FIG7 is a seventh structural block diagram of a power system according to an embodiment;

[0032] FIG8 is an eighth structural block diagram of a power system according to an embodiment;

[0033] FIG9 is a ninth structural block diagram of a power system according to an embodiment;

[0034] FIG10 is a tenth structural block diagram of a power system according to an embodiment.

[0035] Description of reference numerals:

[0036] 10-Inverter, 110-Inversion control circuit, 111-Second signal processing unit, 112-Second communication unit, 120-Inverter circuit, 130-Relay array, 131-First relay, 132-Second relay, 140-Boost circuit, 150-Boost-buck circuit, 160-Detection circuit, 20-Wiring control assembly, 210-Wiring control module, 211-Sampling control unit, 212-First signal processing unit, 213-First communication unit, 220-Switch module, 230-Interface module, 30-Load. DETAILED DESCRIPTION

[0037] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0039] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0040] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0041] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0042] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise," "have," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0043] As shown in Figure 1, an embodiment of the application provides an electric power system. The electric power system may include an inverter 10 and a wiring control component 20. In the embodiment of the present application, the number of inverters 10 may be one or more. If there are multiple inverters 10, each inverter 10 is connected in parallel with the wiring control component 20 to form a multi-inverter 10 (abbreviated as, multi-machine) parallel system. The inverter 10 can be understood as an inverter of the photovoltaic and photovoltaic storage categories. For example, the inverter 10 can be a photovoltaic inverter or an energy storage converter. In the embodiment of the present application, the type of the inverter 10 is not further limited.

[0044] In the embodiments of the present application, for ease of explanation, the inverter 10 is described as a photovoltaic inverter. The inverter 10 may include an inverter control circuit 110 and an inverter circuit 120. The input of the inverter circuit 120 may be connected to a battery and a photovoltaic module to process the electrical signals output by the battery and the photovoltaic module. For example, the inverter circuit 120 may convert the received electrical signals from direct current to alternating current, and adjust the phase, frequency, and amplitude of the received electrical signals. The inverter control circuit 110 may control the inverter circuit 120 to adjust the phase, frequency, and amplitude of the received electrical signals.

[0045] The wiring control assembly 20 can be understood as a control box or junction box independent of the inverter 10, which can be used to support access to an external power network, such as a power grid, a generator power network, etc., and to supply power to the load under the action of the external power network. In one possible implementation, the generator power network can be a power supply network provided by a diesel generator. Specifically, the wiring control assembly 20 may include a wiring control module 210 and a switch module 220. The switch module 220 can be used to connect to the external power network. The external power network can be a single-phase AC power grid or a three-phase AC power grid. The inverter circuit in the inverter can be set to a corresponding number of phases based on the external power network. Optionally, in an embodiment of the present application, the connection node between the load 30 and the wiring control assembly 20 is located in the control box or junction box. The switch module 220 can turn on or off the external power supply path between the external power network and the load 30.

[0046] The wiring control module 210 can be connected to the inverter control circuit 110 and the switch module 220 respectively. Among them, the wiring control module 210 can communicate with the inverter control circuit 110 to transmit relevant status information, various types of data, etc. to each other. The wiring control module 210 can be used to detect and obtain the on-off state of the switch module 220, the electrical parameters of the switch module 220, and can also control the on-off state of the switch module 220. Optionally, the inverter 10 can also be connected to the switch module 220 and can be used to detect and obtain the on-off state of the switch module 220. Optionally, the switch module 220 includes a relay with auxiliary contacts. If the switch module 220 includes a relay, its wiring control module 210 or the inverter 10 can be used to detect the on-off state and electrical parameters of each auxiliary contact of the relay.

[0047] The inverter control circuit 110 can control the inverter circuit 120 to stop outputting the power supply voltage when the external power supply network is abnormal, that is, control the inverter circuit 120 to have zero output. For example, when the external power supply network is abnormal, it can be considered that the power system is in an island state, and the wiring control module 210 controls the switch module 220 to start disconnecting, and synchronously outputs the external power network abnormal state information (also referred to as island state information) to the inverter control circuit 110. The inverter control circuit 110 controls the inverter circuit 120 to have zero output based on the received island state information. Optionally, the zero output of the inverter control circuit 120 can be understood as the inverter control circuit being in a wave-blocking state, for example, stopping providing corresponding drive signals to each switch tube in the inverter.

[0048] Next, the inverter control circuit 110 can output a supply voltage to power the load 30 when the switch module 220 is completely off. Specifically, the wiring control module 210 can continuously collect and obtain the on-state of the switch module 220, and when the switch module 220 is completely off, synchronously communicate with the inverter control circuit 110, for example, outputting information that the switch module 220 is in the completely off state to the inverter control circuit 110. The inverter control circuit 110 can control the output supply voltage of the inverter circuit 120 based on the received information to power the load 30, thereby achieving a switch from a grid-connected state to an off-grid state. Optionally, the inverter 10 itself can continuously collect and obtain the on-off state of the switch module 220. When the switch module 220 is completely off, the inverter control circuit 110 can control the output supply voltage of the inverter circuit 120 to power the load 30.

[0049] In an embodiment of the present application, the power system includes: an inverter and a wiring control component, wherein the inverter includes an inverter control circuit and an inverter circuit, and the wiring control component includes a wiring control module and a switch module; wherein the external power network is connected to the load via the switch module, and the electric energy provided by the external power network can be transmitted to the load. In addition, the inverter circuit can also be directly connected to the load, and the electric energy output by the inverter circuit can be transmitted to the load. The wiring control module is used to control the switch module to start disconnecting when the external power network is out of power or fails, and communicate with the inverter control circuit so that the inverter control circuit controls the inverter circuit to stop outputting the supply voltage to control the inverter circuit to zero output. In addition, the inverter control circuit can also control the output supply voltage of the inverter circuit when the switch module is completely in the disconnected state to supply power to the load, so as to achieve on-grid and off-grid switching. In this way, the load will not be affected by the sudden power outage or failure of the external power network, and can continue to be powered on and work under the action of the inverter, thereby improving the effectiveness of the load being continuously powered.

[0050] In one embodiment, as shown in Figures 2 and 3, the wiring control assembly 20 further includes an interface module 230. The interface module 230 is used to connect to an external power network. Figure 3 uses the example of an external power network providing power to a diesel generator, referred to as the diesel generator power network. Subsequent embodiments of this application will also use the example of an external power network providing power to a diesel generator. In this embodiment of the application, there can be one or more interface modules 230. Referring to Figure 3, if there are multiple interface modules 230, each interface module 230 connects to a different type of external power network. Each interface module 230 can be connected to the output of the inverter circuit 120 in the inverter 10. A load 30 is connected to the power supply path between the interface module 230 and the input of the inverter circuit 120. In other words, the load 30 can receive power from the inverter assembly or from the external power network transmitted via the interface module 230. The switch module 220 is disposed between the load 30 and the interface module 230 . The switch module 220 can connect or disconnect the external power supply path between the external power network and the load 30 .

[0051] Optionally, the wiring control module 210 can be used to detect electrical parameters of the interface module 230. Furthermore, the wiring control module 210 can determine whether the electrical parameters of the interface module 230 are abnormal based on the detected electrical parameters. Optionally, the wiring control module 210 can compare the electrical parameters of the interface module 230 with preset electrical parameters. If the parameters exceed the parameter range corresponding to the preset electrical parameters, the electrical parameters of the interface module 230 can be considered abnormal. For example, if the electrical parameter is voltage, if the current voltage of the interface module 230 is 0, the interface module 230 and the external power network can be considered to be in a power outage state; if the current voltage of the interface module 230 exceeds the preset voltage range, the interface module 230 and the external power network can be considered to be in a fault state. In the event of an abnormality in the external power supply network, the power system may be considered to be in an islanded state. The connection control module 210 controls the switch module 220 to begin disconnecting and simultaneously outputs external power network abnormality status information (also known as islanded state information) to the inverter control circuit 110. Based on the received islanded state information, the inverter control circuit 110 controls the inverter circuit 120 to zero output. Subsequently, the inverter control circuit 110 can also control the output supply voltage of the inverter circuit 120 to power the load 30 when the switch module 220 is completely disconnected.

[0052] In addition to being able to switch between on-grid and off-grid, the power system in the embodiment of the present application can also be able to switch between on-grid and off-grid. The specific implementation process is as follows:

[0053] The wiring control module 210 is further configured to transmit the electrical parameters of the interface module 230 to the inverter control circuit 110 when the electrical parameters of the interface module 230 are normal and the switch module 220 is in the disconnected state. When the electrical parameters of the interface module 230 are normal and the switch module 220 connected to the interface module 230 is in the disconnected state, this indicates that the external power network has just switched from an off-grid state to a normally connected state with the interface module 230. In this case, the wiring control module 210 transmits the detected electrical parameters of the interface module 230 to the inverter control circuit 110. The inverter control circuit 110 controls the inverter circuit 120 to adjust the electrical parameters of the supply voltage based on the received electrical parameters to match the electrical parameters of the interface module 230. For example, the electrical parameters may include voltage amplitude, phase, and frequency. The inverter circuit 120 can invert the received AC power signal into a DC power signal. Based on the control of the inverter control circuit 110, the inverter circuit 120 can adjust the oscillation time and oscillation magnitude of the switching transistors in the inverter circuit 120 to adjust the amplitude, phase, and frequency of the supply voltage, thereby outputting a target AC voltage that is compatible with the electrical parameters of the interface module 230. The electrical parameters of the supply voltage being compatible with the electrical parameters of the interface module 230 can be understood as the electrical parameters of the adjusted supply voltage (target AC voltage) and the electrical parameters of the interface module 230 being within corresponding preset ranges. For example, the amplitude of the voltage is within the preset amplitude range, the phase of the voltage is within the preset amplitude range, and the frequency of the voltage is within the preset frequency range. The preset amplitude range, the preset amplitude range, and the preset frequency range are custom ranges and can be pre-stored in the inverter control circuit 110 and the wiring control module 210.

[0054] The inverter control circuit 110 is further configured to output the adaptation result to the connection control module 210. Specifically, the inverter control circuit 110 may output the adaptation result when the electrical parameters of the adjusted supply voltage match the electrical parameters of the interface module 230. Based on the received adaptation result, the connection control module 210 may control the switch module 220 to be in an on state, thereby establishing an external power supply path between the external power network and the load 30, allowing the external power network to supply power to the load 30. In this way, the power system can achieve on-grid and off-grid switching.

[0055] In this embodiment, when the electrical parameters of the interface module are normal and the switch module is in a disconnected state (the external power network switches from an off-grid state to a normally connected state with the interface module), the wiring control module transmits the detected electrical parameters of the interface module to the inverter control circuit. The inverter control circuit controls the inverter circuit to adjust the electrical parameters of the supply voltage based on the received electrical parameters to match the electrical parameters of the interface module, and outputs the adaptation results to the wiring control module. The wiring control module controls the switch module to be in a conductive state based on the received adaptation results, thereby establishing an external power supply path between the external power network and the load, allowing the external power network to supply power to the load. In this way, the power system can achieve off-grid and on-grid switching. During the off-grid switching process, the inverter and the wiring control assembly can communicate directly, which improves communication response time. At the same time, the short on-time of the switch module (the time from initial on-state to full on-state) can effectively improve the efficiency of the off-grid switching process, effectively and quickly connecting the load to the external power network and improving the effectiveness of the load's continuous power supply.

[0056] In one embodiment, the wiring control module 210 is further configured to output a mode switching instruction to the inverter control circuit 110 after controlling the switch module 220 to be in the on state, so that the inverter control circuit 110 controls the inverter circuit 120 to stop outputting the power supply voltage, switches the operating mode of the inverter circuit 120, and starts operating in the switched operating mode.

[0057] When the off-grid switching is achieved, the switch module 220 is in the on state, and the connection control module 210 outputs a mode switching instruction to the inverter control circuit 110. Upon receiving the mode switching instruction, the inverter control circuit 110 first controls the inverter circuit 120 to stop outputting the supply voltage, thereby achieving zero output from the inverter control circuit 110. After the inverter circuit 120 stops outputting the supply voltage, the inverter circuit 120 is controlled to operate in the grid-connected mode according to the mode switching instruction. In this mode, the inverter circuit 120 operates normally, outputting the grid-connected supply voltage to the load 30.

[0058] As shown in Figure 4, in one embodiment, the wiring control module 210 includes a sampling control unit 211 and a first signal processing unit 212. The sampling control unit 211 is connected to the interface module 230 and the switch module 220, respectively, and is used to collect electrical parameters of the interface module 230 and the on / off status information of the switch module 220, and to control the on / off status of the switch module 220. In this embodiment of the present application, for ease of description, the switch module 220 is described as a relay.

[0059] The control unit may include a detection subunit and a control subunit, wherein the detection subunit is used to collect electrical parameters of the interface module 230 and on / off status information of the switch module 220, and the control subunit is used to control the on / off status of the switch module 220 according to an external control signal.

[0060] The first signal processing unit 212 is connected to the sampling control unit 211 and the inverter control circuit 110 respectively. The first signal processing unit 212 can be a digital signal processor (DSP) of the junction box. In an embodiment of the present application, the first signal processing unit 212 can be used to determine whether the electrical parameters of the interface module 230 are abnormal based on the electrical parameters, and when the electrical parameters are abnormal, control the sampling control unit 211 to control the relay to start disconnecting. At the same time, the first signal processing unit 212 can also output first status information to the inverter control circuit 110. The first status information may include abnormal status information of the external power network or island status information. The first status information is used to instruct the inverter control circuit 110 to control the inverter circuit 120 to stop outputting the supply voltage. It is understandable that when the inverter control circuit 110 receives the first status information, it can control the inverter circuit 120 to stop outputting the supply voltage based on the first status information.

[0061] The first signal processing unit 212 obtains the on / off status information of the relay in real time. When the relay is completely off, the first signal processing unit 212 then outputs second status information to the inverter control circuit 110. The second status information may include information indicating that the switch module 220 is completely off. The second status information is used to instruct the inverter control circuit 110 to control the output power supply voltage of the inverter circuit 120 to power the load 30. It is understood that upon receiving the second status information, the inverter control circuit 110 may control the inverter circuit 120 to resume operation based on the second status information, outputting the power supply voltage to power the load 30, thereby achieving on-grid and off-grid switching.

[0062] In an embodiment of the present application, a wiring control module 210 including a sampling control unit 211 and a first signal processing unit 212 is provided, wherein the sampling control unit 211 is responsible for sampling and controlling the switching state of the switching module 220 and sampling the electrical parameters of the interface module 230, and the first signal processing unit 212 is responsible for data interaction with the inverter circuit 120 and control of the control unit. The various units cooperate with each other to improve the communication processing efficiency and the processing efficiency of various information. The communication response time is within 3ms. In addition, the switching module 220 in the embodiment of the present application adopts a relay, and the disconnection time of the relay (the time from the beginning of disconnection to complete disconnection) can be controlled within 12ms. Therefore, this control method can control the switching time of on-grid and off-grid to within 15ms, which is less than the 20ms required for fast on-grid and off-grid switching. In this way, even during the on-grid switching process, even if the external power network is out of power or fails, the inverter circuit 120 component can respond quickly to provide power to the load 30. Since the on-grid switching time is very short, for example, 15ms, the load 30 will not be affected by the external power network being off-grid and can continue to be powered on.

[0063] As shown in FIG5 , the inverter control circuit 110 optionally includes a second signal processing unit 111. The second signal processing unit 111 is connected to the inverter circuit 120 and the first signal processing unit 212, respectively. The second signal processing unit 111 and the first signal processing unit 212 are connected via a CAN bus. For example, the first signal processing unit 212 may be an inverter digital signal processor.

[0064] In an embodiment of the present application, the first signal processing unit 212 of the wiring control module 210 and the second signal processing unit 111 in the inverter control circuit 110 can be connected via a CAN bus. The first signal processing unit 212 and the second signal processing unit 111 implement data (e.g., first state information, second state information) interaction, which can improve the transmission efficiency of data transmission, for example, the communication response time is controlled within 1ms. In addition, in the embodiment of the present application, the disconnection time of the relay can be controlled within 12ms, so this control method can control the on-grid switching time within 13ms, which is less than the 20ms required for fast on-grid switching. In this way, the on-grid switching time of the external power network can be further improved, and its inverter circuit 120 component can respond faster to provide power to the load 30. Since the on-grid switching time is very short, for example, 13ms, its load 30 will not be affected by a sudden power outage or failure of the external power network and can continue to be powered on.

[0065] In one embodiment, the off-grid and on-grid switching is described by taking an example where the connection control module 210 includes a first signal processing unit 212 and a sampling control unit 211 and the inverter control circuit 110 includes a second signal processing unit 111 .

[0066] Specifically, the first signal processing unit 212 is further configured to output third status information to the second signal processing unit 111 of the inverter control circuit 110 when the switch module 220 is in the disconnected state and the electrical parameters of the interface module 230 are normal. When the electrical parameters of the interface module 230 are normal and the switch module 220 connected to the interface module 230 is in the disconnected state, this indicates that the external power network has just switched from an off-grid state to a normally connected state with the interface module 230. The third status information includes the electrical parameters of the interface module 230 and the grid connection status information.

[0067] The third state information is used to instruct the inverter control circuit 110 to control and adjust the electrical parameters of the supply voltage to match the electrical parameters carried in the third state information. It is understood that upon receiving the third state information, the second signal processing unit 111 controls the inverter circuit 120 to adjust the electrical parameters of the supply voltage based on the third state information, for example, adjusting the amplitude, phase, and frequency of the supply voltage, so that the inverter circuit 120 outputs a target AC voltage that matches the electrical parameters of the interface module 230. Simultaneously, the second signal processing unit 111 of the inverter control circuit 110 outputs the adaptation result to the first signal processing unit 212 when the inverter circuit 120 outputs the target AC voltage. Based on the received adaptation result, the first signal processing unit 212 controls the sampling control unit 211 to control the switch module 220 (e.g., a relay) to be in a conductive state, thereby establishing an external power supply path between the external power network and the load 30, allowing the external power network to supply power to the load 30. In this way, the power system can achieve a switchover of the external power network from an off-grid state to a grid-connected state.

[0068] In an embodiment of the present application, the first signal processing unit 212 of the wiring control module 210 and the second signal processing unit 111 in the inverter control circuit 110 can be connected via a CAN bus. The first signal processing unit 212 and the second signal processing unit 111 implement data (e.g., third state information, adaptation results) interaction, which can improve the transmission efficiency of data transmission, for example, the communication response time is controlled within 1ms. In addition, the conduction time of the relay in the embodiment of the present application can be controlled within 4ms, so this control method can control the switching time of the external power network from the off-grid state to the grid-connected state (referred to as the off-grid switching time) to within 5ms, which is less than the 20ms required for fast on-grid switching. In this way, the off-grid switching time of the external power network can be further improved, and its inverter circuit 120 component can respond faster to provide power to the load 30. Since the on-grid switching time is very short, for example, 5ms, its load 30 can be connected to the external power network off-grid faster to improve the safe operation performance of the load 30.

[0069] Continuing with FIG5 , the sampling control unit 211 may optionally further collect a first switching voltage and a second switching voltage across the switch module 220 and transmit the collected first switching voltage and second switching voltage to the first signal processing unit 212. The first switching voltage can be understood as the voltage on the side of the switch module 220 close to the load 30, and the second switching voltage can be understood as the voltage on the side of the switch module 220 close to the interface module 230, or the voltage of the interface module 230. After receiving the adaptation result output by the first signal processing unit 212, the first signal processing unit 212 detects whether the first switching voltage and the second switching voltage are consistent. If the first switching voltage and the second switching voltage are consistent, the sampling control unit 211 controls the relay to be in the on state. The consistency of the first switching voltage and the second switching voltage means that the difference between the amplitude of the first switching voltage and the amplitude of the second switching voltage is less than a preset amplitude, the difference between the phase of the first switching voltage and the phase of the second switching voltage is less than a preset phase, and the difference between the frequency of the first switching voltage and the frequency of the second switching voltage is less than a preset frequency.

[0070] In an embodiment of the present application, the sampling control unit 211 determines whether the voltages at both ends of the switch module 220 are consistent based on the collected first switch voltage and the second switch voltage, and when the first switch voltage and the second switch voltage are consistent, it is considered that the grid-connected condition is met. At the same time, the accuracy of the target AC voltage transmitted to the switch module 220 can also be verified to improve the switching safety of the external power network from an off-grid state to a grid-connected state.

[0071] As shown in Figure 6, in one embodiment, data exchange between the wiring control module 210 and the inverter control circuit 110 can be achieved through a first signal processing unit 212 and a second signal processing unit 111. Furthermore, the wiring control module 210 also includes a first communication unit 213, and the inverter control circuit 110 also includes a second communication unit 112. The first communication unit 213 and the second communication unit 112 communicate via ARM.

[0072] Optionally, the first communication unit 213 may also be connected to the first signal processing unit 212, and the second communication unit 112 may also be connected to the second signal processing unit 111. That is to say, the first signal processing unit 212 may be sequentially transmitted through the first communication unit 213, the second communication unit 112 and the second signal processing unit 111. In the embodiment of the present application, in addition to the first state information, the second state information, the third state information and the adaptation result mentioned above, the information can be realized through the first communication unit 213 and the second communication unit 112 to realize the communication and data interaction between the inverter 10 and the wiring control component 20. For example, other information of the inverter 10 (for example, power information, etc.) can be uniformly transmitted to the wiring control component 20 through RS485 communication.

[0073] In an embodiment of the present application, two communication mechanisms are set up, including ARM communication and CAN communication. Among them, information related to off-grid switching is realized through the CAN communication mechanism to realize data interaction between the inverter 10 and the wiring control component 20, and information unrelated to off-grid switching is realized through the ARM communication mechanism to realize data interaction between the inverter 10 and the wiring control component 20. This can increase the communication rate of CAN communication and thereby increase the switching time of off-grid switching.

[0074] In the aforementioned embodiment, the wiring control assembly 20 in the power system includes an interface module 230 and a switch module 220. The external power network is connected to the load 30 via the interface module 230 and the switch module 220, forming a power supply path for the external power network to supply power to the load 30. That is, in the aforementioned embodiment, the wiring control assembly 20 is provided with a single power supply path. As shown in FIG7 , unlike the aforementioned embodiment, this embodiment utilizes multiple power supply paths, each of which includes an interface module 230 and a switch module 220. In other words, the wiring control assembly 20 includes multiple interface modules 230 and multiple switch modules 220. Each interface module 230 is used to connect to a different type of external power network. Accordingly, each interface module 230 is connected to the inverter circuit 120 via a switch module 220, and each interface module 230 is connected to a different switch module 220.

[0075] In the wiring control assembly 20, at any given moment, only one external power network is supplying power to the load 30. In this embodiment of the present application, the external power network currently supplying power to the load 30 is referred to as the target external power network. It is understood that at any given moment, the target switch module is in an on state, such that the target external power network supplies power to the load 30, and the target switch module is one of the multiple switch modules 220. In other words, the target external power network is one of the multiple external power networks. It is understood that at any given moment, in the wiring control assembly 20, only one power supply path is in an on state, such that the external power network supplies power to the load 30.

[0076] In an embodiment of the present application, the wiring control module 210 is used to control the on / off state of the target switch module. Specifically, when the target external power network is supplying power to the load 30 and the electrical parameters of the target interface module 230 connected to the target external power network are abnormal, the wiring control module 210 begins to control the target switch module 220 to disconnect and communicates with the inverter control circuit 110 so that the inverter control circuit 110 controls the inverter circuit 120 to stop outputting the supply voltage. Next, when the target switch module 220 is completely disconnected, the wiring control module 210 is further used to control the inverter control circuit 110 to control the output supply voltage of the inverter circuit 120 to power the load 30, thereby achieving on-grid and off-grid switching.

[0077] Accordingly, after the target external power network returns to normal, its off-grid switching system can achieve off-grid and on-grid switching. Specifically, the wiring control module 210 transmits the detected electrical parameters of the target interface module to the inverter control circuit 110. The inverter control circuit 110 controls the inverter circuit 120 to adjust the electrical parameters of the supply voltage based on the received electrical parameters to match the electrical parameters of the target interface module, and outputs the adaptation results to the wiring control module 210. The wiring control module 210 can control the target switch module to be in the on state based on the received adaptation results, so as to conduct the external network power supply path between the target external power network and the load 3030, so that the target external power network can supply power to the load 30.

[0078] In an embodiment of the present application, the wiring control component 20 includes multiple interface modules 230 and multiple switch modules 220. Each interface module 230 can be connected to different types of external power networks. By setting the connection relationship between multiple external power networks, multiple interface modules 230, multiple switch modules 220 and the load 30, it can support the access of multiple external power networks to provide multi-directional and multi-scenario power supply for the load 30.

[0079] Optionally, the multiple interface modules may include a power grid interface module 230-1 and a generator interface module 230-2. Power grid interface module 230-1 is used to connect to the power grid, i.e., the external power network is the power grid. Generator interface module 230-2 is used to connect to the generator power network, i.e., the external power network is the generator power network. In this embodiment of the present application, the types of interface modules and external power networks are not further defined, nor are they limited to the examples described above.

[0080] In an embodiment of the present application, in the event of a power outage in the power grid, the power supply path of the generator power network can be opened to enable the generator power network. There are generally two ways to enable the generator power network: manual and automatic. Manual startup refers to the user actively triggering the corresponding start button to start the system. Automatic startup refers to the power system being able to start the system based on the battery state of charge (SOC) of the inverter 10. For example, when the battery state of charge is lower than a first preset threshold, the generator power network operation mode is enabled; when the battery state of charge is higher than the first preset threshold, the generator power network operation mode is disabled.

[0081] With the generator power network enabled, in the event of a power outage, the wiring control module 210 can transmit the electrical parameters of the generator interface module 230-2 to the inverter control circuit 110, provided that the switch module 220 is completely disconnected and the electrical parameters of the generator interface module 230-2 are normal. Normal electrical parameters can be understood as meaning that the supply voltage and frequency of the generator interface module 230-2 are within a normal range, for example, a supply voltage of 240V and a frequency within 55-65Hz. The inverter control circuit 110 can control the inverter circuit 120 to adjust the electrical parameters of the supply voltage to match the electrical parameters of the generator interface module 230-2, and output the adaptation results to the wiring control module 210, causing the wiring control module 210 to control the switch module 220 to be in a conductive state, thereby enabling the generator power network to supply power to the load. It can be understood that: in the event of a power outage, the inverter 10 will switch to off-grid operation. During the off-grid operation, if the electrical parameters of the generator interface module 230-2 are detected to be normal, the grid-connected logic of the inverter 10 and the generator will be started.

[0082] If the grid receives power during the operation of the generator power network, the wiring control component 20 will control the power supply path of the generator power network to be disconnected, and then execute the grid connection process of the off-grid switching described in the aforementioned embodiment to connect the inverter 10 to the grid. Specifically, when the generator power network is supplying power to the load, the wiring control module 210 is also used to control the switch module 220 to start disconnecting when the electrical parameters of the grid port module 230-1 are normal, and communicate with the inverter control circuit 110 so that the inverter control circuit 110 controls the inverter circuit 120 to stop outputting the supply voltage. The normal electrical parameters of the grid port module 230-1 can be understood as the power supply voltage of the grid port module 230-1 being between 221-265V and the frequency being within 55-65Hz. Furthermore, when the switch module 230 is completely disconnected, the wiring control module 210 sends the electrical parameters of the grid port module 230-1 to the inverter control circuit 110. Furthermore, the inverter control circuit 110 is further configured to control the inverter circuit 120 to adjust the electrical parameters of the supply voltage to match the electrical parameters of the grid port module 230-1, and output the adaptation results to the wiring control module 210, so that the wiring control module 210 controls the switch module 230 to be in the conductive state, thereby allowing the grid to supply power to the load. It can be understood that during operation of the generator power network, if grid power is detected and the grid voltage and frequency are normal, the inverter 10 will first be forced to execute off-grid operation and then execute grid connection according to the off-grid control logic.

[0083] In the embodiment of the present application, for the convenience of explanation, the target external power network is taken as the power grid, and the on-grid switching and off-grid switching are implemented as an example for explanation.

[0084] During a power outage or grid failure, if the second signal processing unit 212 in the wiring control assembly 20 detects the system islanding state, it controls the switch module 220-1 (e.g., relay Rly3) to open. Simultaneously, it communicates the islanding state information to the second signal processing unit 111 of the inverter 10 via CAN communication. The second signal processing unit 111 of the inverter 10 controls the output of the inverter circuit 120 to 0. After relay Rly3 opens, the second signal processing unit 212 in the wiring control assembly 20 detects the state of relay Rly3 and communicates this to the second signal processing unit 111 of the inverter 10. The second signal processing unit 111 switches the operating mode from grid-connected to off-grid, controlling the output voltage of the inverter circuit 120 to supply power to the load 30. Because the opening and closing time of relay Rly3 can be achieved within 12 ms and the communication response time is within 1 ms, this control method can reduce the on-grid and off-grid switching time to within 13 ms, which is less than the 20 ms required for fast on-grid and off-grid switching.

[0085] Accordingly, when inverter 10 is operating off-grid and the grid is restored, second signal processing unit 212 in wiring control assembly 20 detects the grid status and transmits this information to second signal processing unit 111 of inverter 10 via CAN communication. Second signal processing unit 111 then begins adjusting the amplitude, phase, and frequency of the supply voltage. Once the voltages before and after relay Rly3 are consistent, meeting grid connection requirements, second signal processing unit 212 in wiring control assembly 20 controls relay Rly3 to close. After relay Rly3 closes, second signal processing unit 111 of inverter 10 controls inverter circuit 120 to shut off the power supply, switching the operating mode before resuming normal power supply operation. This entire process ensures a switching time of less than 5ms.

[0086] When the target external power network is a generator power network, the switching logic of parallel disconnection and disconnection is the same as that of the target external power network is a grid, except that the target switch module and the target interface module are different. Here, they are not described one by one.

[0087] As shown in FIG8 , in one embodiment, the inverter 10 further includes a relay array 130 . The relay array is disposed in the power supply path between the inverter circuit 120 and the switch module 220 . The relay array is configured to open or close the power supply path of the inverter circuit 120 under the control of the inverter control circuit 110 .

[0088] The relay array may include a first relay 131 and a second relay 132 connected in series. In the embodiment of the present application, if the inverter circuit 120 is in a normal working state, the first relay 131 and the second relay 132 may always be in an on state.

[0089] Optionally, the inverter control circuit 110 can obtain the working status of the inverter circuit 120. If an abnormality occurs in the inverter circuit 120, the inverter control circuit 110 can simultaneously turn off the first relay 131 and the second relay 132, that is, control the first relay 131 and the second relay 132 to be closed and in a disconnected state to disconnect the power supply path of the inverter circuit 120, so as to prevent the power supply voltage output by the inverter circuit 120 in an abnormal state from causing damage to the load 30 or the external power network, so as to prevent the occurrence of safety accidents.

[0090] Continuing with FIG8 , in one embodiment, the inverter 10 further includes: at least one of a boost circuit 140 and a buck-boost circuit 150. The input of the boost circuit 140 is configured to receive a photovoltaic voltage, and the output of the boost circuit 140 is connected to the input of the inverter circuit 120. Under the control of the inverter control circuit 110, the inverter circuit 120 can invert the received photovoltaic voltage. The input of the buck-boost circuit 150 is configured to receive a battery voltage, and the output of the buck-boost circuit 150 is connected to the input of the inverter circuit 120. Under the control of the inverter control circuit 110, the inverter circuit 120 can invert the received battery voltage.

[0091] In an embodiment of the present application, the inverter control component can receive external photovoltaic voltage and / or battery voltage by setting at least one of the boost circuit and the buck-boost circuit 150, and then invert the received voltage to expand the application scenarios of the power system. The application scenario can be an energy storage power station or a photovoltaic storage system, such as a household photovoltaic storage system.

[0092] As shown in FIG9 , in one embodiment, the inverter 10 further includes a detection circuit 160. A first terminal and a second terminal of the detection circuit 160 are connected in parallel to the switch module 220, and a third terminal of the detection circuit 160 is connected to the inverter control circuit 110. The detection circuit 160 is configured to detect the on / off state of the switch module 220 and transmit the detected on / off state to the inverter control circuit 110.

[0093] In this embodiment, a detection circuit is set in the inverter, which can be directly connected to the switch module to detect the on-off state of the switch module. In this way, there is no need to transmit the on-off state of the switch module through the wiring control module, which can further improve the detection results and detection efficiency of the on-off state of the switch module, thereby improving the switching efficiency of on-grid switching and off-grid switching.

[0094] In one embodiment, the detection circuit 160 is specifically used to detect the on-off state of the switch module 220 and obtain a level value corresponding to the on-off state of the switch module 220; and send the level value to the inverter control circuit 160, and the inverter control circuit 160 is further used to determine the on-off state of the switch module 220 based on the received level value.

[0095] In an embodiment of the present application, upon detecting that the switch module 220 is in an open state, the detection circuit 160 obtains a first electrical level corresponding to the open state, and upon detecting that the switch module 220 is in a closed state, obtains a second electrical level corresponding to the closed state. The control inverter circuit 160 may determine that the switch module 220 is in an open state upon receiving the first electrical level, and determine that the switch module 220 is in an open state upon receiving the second electrical level. The first electrical level is a high level, and the second electrical level is a low level. Alternatively, the first electrical level is a low level, and the second electrical level is a high level.

[0096] In this embodiment, a detection circuit is provided in the inverter, which is directly connected to the switch module. By obtaining a voltage level corresponding to the on / off state of the switch module and transmitting the obtained voltage level to the inverter control circuit, the inverter control circuit can determine the on / off state of the switch module based on the received voltage level. This eliminates the need to transmit the on / off state of the switch module through the wiring control module, further improving the accuracy and efficiency of detecting the on / off state of the switch module, thereby improving the switching efficiency of on-grid and off-grid switching. Because the relay disconnection time in the switch module can be achieved within 12ms, combined with the signal transmission delay of the detection circuit and the response time of the inverter control circuit, this control method can control the on / off switching time to within 15ms, which is less than the 20ms required for fast on / off-grid switching.

[0097] As shown in FIG10 , in one embodiment, a power system includes: a plurality of inverters 10. The inverter control circuit 110 in each inverter 10 is respectively connected to a wiring control module 210, and the operating state of each inverter control circuit 110 is the same; the inverter circuit 120 in each inverter 10 is respectively connected to a load 30. It is understood that the inverter circuits 120 in each inverter 10 are connected in parallel.

[0098] In this embodiment, the power system includes multiple inverters 10, which can be referred to as a multi-machine parallel system. In the multi-machine parallel system, the wiring control component 20 is the master, and each inverter 10 is a slave, and all inverters have the same control state.

[0099] Taking grid-connected switching as an example, during a power outage or fault, the wiring control module 210 in the wiring control assembly 20 detects system islanding status information and begins controlling the switch module 220 (e.g., a relay) to disconnect. Simultaneously, this islanding status information is communicated to the second signal processing units 111 of all inverters via CAN communication. The second signal processing units 111 of each inverter 10 control the output of the inverter circuit 120 to 0. After the switch module 220 (e.g., relay) disconnects, the wiring control module 210 detects the switch module 220 status and communicates it to the second signal processing units 111 of all inverters. The second signal processing units 111 then control the switching mode from grid-connected to grid-off, controlling the output voltage of the inverter circuit 120 to supply power to the load 30. Because the relay disconnection time of the switch module 220 can be achieved within 12 ms and the communication response time is within 1 ms, this control method can control the grid-connected and grid-off switching time to within 17 ms, which is less than the 20 ms required for fast grid-connected and grid-off switching. Correspondingly, the process of implementing off-grid switching can be referred to the aforementioned embodiment and will not be described in detail here.

[0100] The power system of this embodiment includes multiple inverters, which can support multiple parallel connections and are applicable to multi-machine scenarios. They can further be expanded and applied to off-grid switching scenarios, thereby improving the diversity and scalability of the power system.

[0101] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0102] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above embodiments merely illustrate several embodiments of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A power system, characterized in that, Comprising: An inverter, including an inversion control circuit and an inversion circuit; A wiring control component, including a wiring control module and a switch module; wherein, the switch module is respectively connected to the inversion circuit and an external power network, and the power supply path between the switch module and the inversion circuit is used to connect a load, where The wiring control module is respectively connected to the inversion control circuit and the switch module; wherein, the wiring control module is used to control the switch module to disconnect in the case of an abnormality in the external power network, and communicate with the inversion control circuit to enable the inversion control circuit to control the inversion circuit to stop outputting a power supply voltage; The control inversion circuit is used to control the output power supply voltage of the inversion circuit to supply power to the load in the case where the switch module is completely in the off state.

2. The power system according to claim 1, wherein The wiring control component further includes: an interface module, a first end of the interface module is connected to the switch module, and a second end of the interface module is used to connect to the external power network; where The wiring control module is further used to send the electrical parameters of the interface module to the inversion control circuit in the case where the switch module is completely in the off state and the electrical parameters of the interface module are normal; The inversion control circuit is further used to control the inversion circuit to adjust the electrical parameters of the power supply voltage to be adapted to the electrical parameters of the interface module, and output an adaptation result to the wiring control module, so that the wiring control module controls the switch module to be in the on state, so that the external power network supplies power to the load.

3. The power system according to claim 2, wherein After the wiring control module controls the switch module to be in the on state, it outputs a mode switching instruction to the inversion control circuit, so that the inversion control circuit controls the inversion circuit to stop outputting a power supply voltage, and switches the operating mode of the inversion circuit to start operating according to the switched operating mode.

4. The power system according to claim 2, wherein The wiring control module includes: A sampling control unit, respectively connected to the interface module and the switch module, for collecting the electrical parameters of the interface module and the on-off state information of the switch module, and controlling the on On-off state; A first signal processing unit, respectively connected to the sampling control unit and the inversion control circuit, for enabling the sampling control unit to control the switch module to start disconnecting in the case of abnormal electrical parameters of the interface module, and outputting first state information to the inversion control circuit; and further used to output second state information to the inversion control circuit in the case where the switch module is completely in the off state; where The first state information is used to instruct the inversion control circuit to control the inversion circuit to stop outputting a power supply voltage, and the second state information is used to instruct the inversion control circuit to control the output power supply voltage of the inversion circuit to supply power to the load.

5. The power system according to claim 4, characterized in that, The first signal processing unit is further configured to output third status information to the inverter control circuit when the switch module is completely in the off state and the electrical parameters of the interface module are normal, where the third status information is used to instruct the inverter control circuit to control and adjust the electrical parameters of the power supply voltage to be adapted to the electrical parameters of the interface module carried by the third status information; The first signal processing unit is further configured to receive the adaptation result output by the inverter control circuit, and according to the adaptation result, cause the sampling control unit to control the switch module to be in the on state, so that the external power network supplies power to the load.

6. The power system according to claim 4, characterized in that, The inverter control circuit includes: A second signal processing unit, which is respectively connected to the inverter circuit and the second signal processing unit, where the second signal processing unit is connected to the first signal processing unit through a CAN bus.

7. The power system according to claim 6, characterized in that, The wiring control module further includes: A first communication unit, which is connected to the first signal processing unit; The inverter control circuit further includes: A second communication unit, which is respectively connected to the first communication unit and the second signal processing unit, where the first communication unit communicates with the second communication unit through ARM communication.

8. The power system according to claim 2, characterized in that, The power system includes a plurality of interface modules and a plurality of switch modules, and the wiring control module is respectively connected to the inverter control circuit, each of the switch modules, and each of the interface modules; where Each of the interface modules is used to connect different types of external power networks. Each interface module is connected to the inverter circuit through a switch module, and the switch modules connected by each interface module are different. At the same time, the target switch module is in the on state to enable the target external power network to supply power to the load, and the target switch module is one of the plurality of switch modules. The wiring control module is used to control the on / off state of the target switch module.

9. The power system according to claim 8, characterized in that, The plurality of interface modules include: A power grid interface module, which is used to connect to the power grid; A generator interface module, which is used to connect to the generator power network.

10. The power system according to claim 9, characterized in that, The wiring control module is further configured to send the electrical parameters of the generator interface module to the inverter control circuit when the switch module is completely in the off state and the electrical parameters of the generator interface module are normal; The inverter control circuit is further configured to control the inverter circuit to adjust the electrical parameters of the power supply voltage to be adapted to the electrical parameters of the generator interface module, and output the adaptation result to the wiring control module, so that the wiring control module controls the switch module to be in the on state, so that the generator power network supplies power to the load.

11. The power system according to claim 10, wherein During the process of the generator power network supplying power to the load, the wiring control module is further configured to control the switch module to start disconnecting when the electrical parameters of the power grid interface module are normal, communicate with the inverter control circuit to cause the inverter control circuit to control the inverter circuit to stop outputting the power supply voltage, and send the electrical parameters of the power grid interface module to the inverter control circuit when the switch module is completely in the off state; The inverter control circuit is further configured to control the inverter circuit to adjust the electrical parameters of the power supply voltage to match the electrical parameters of the grid port module, and output the matching result to the wiring control module, so that the wiring control module controls the switch module to be in the on state, enabling the power grid to supply power to the load.

12. The power system according to claim 1, characterized in that, The inverter further includes: A detection circuit, the first end and the second end of the detection circuit are used to be connected in parallel with the switch module, the third end of the detection circuit is connected to the inverter control circuit, and the detection circuit is configured to detect the on / off state of the switch module and send the detected on / off state to the inverter control circuit.

13. The power system according to claim 12, characterized in that, Specifically, the detection circuit is configured to detect the on / off state of the switch module, obtain a level value corresponding to the on / off state of the switch module, and send the level value to the inverter control circuit; The inverter control circuit is further configured to determine the on / off state of the switch module according to the received level value.

14. The power system according to claim 13, wherein When the detection circuit detects that the state of the switch module is the off state, it obtains a first level value corresponding to the off state, and when it detects that the state of the switch module is the on state, it obtains a second level value corresponding to the on state; where The control inverter circuit is configured to determine that the state of the switch module is the off state when receiving the first level value, and determine that the state of the switch module is the on state when receiving the second level value.

15. The power system according to claim 1, characterized in that, The inverter further includes: A relay array, arranged on the power supply path between the inverter circuit and the switch module, and the relay array is configured to conduct or disconnect the power supply path of the inverter circuit under the control of the inverter control circuit.

16. The power system according to claim 1, characterized in that, The inverter further includes: A boost circuit, the input end of the boost circuit is used to receive the photovoltaic voltage, and the output end of the boost circuit is connected to the input end of the inverter circuit; A buck-boost circuit, the input end of the boost circuit is used to receive the battery voltage, and the output end of the buck-boost circuit is connected to the input end of the inverter circuit.

17. The power system according to any one of claims 1-16, characterized in that, The power system includes: a plurality of the inverters; where The inverter control circuits in each of the inverters are respectively connected to the wiring control module, and the working states of the inverter control circuits are the same; The inverter circuits in each of the inverters are respectively connected to the switch module and the load.

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