Fault detection method of power supply circuit and electronic equipment

Abstract

The invention discloses a fault detection method of a power supply circuit and electronic equipment, and the method comprises the steps: responding to a condition that a power grid is in a normal state, enabling control of a first switch module, enabling control of a second switch module and enabling control of a third switch module are in a normal state, and an inverter module is in a first-time power-on state; if yes, executing a preset first detection action; in response to the fact that the power grid is in the normal state and at least one of the enable control of the first switch module, the enable control of the second switch module and the enable control of the third switch module is in the abnormal state, executing a preset second detection action and executing a first detection action; the first detection action comprises performing first fault detection on the second switch module and the third switch module, and the second detection action comprises performing second fault detection on the first switch module. Based on the above mode, the fault detection efficiency can be improved while the reliability of fault detection is ensured.

Description

Technical Field

[0001] This application relates to the field of detection technology, and in particular to fault detection methods and electronic equipment for power supply circuits. Background Technology

[0002] In existing technologies, to build an energy network, photovoltaic modules or energy storage modules and their inverters are usually connected at different nodes of the power grid. The specific connection method is mostly that the photovoltaic module or energy storage module is connected to the inverter, the inverter is connected to the inverter relay, and the inverter switch is then connected to the power grid through two levels of relays. Subsequently, the photovoltaic module or energy storage module can be connected to or disconnected from the power grid by controlling the opening and closing of the inverter.

[0003] The drawback of existing technologies is that fault detection is only performed when an abnormal condition is found in a relay or other type of switch. This can easily lead to the omission of some faults, such as ignoring faults where relays or other types of switches cannot switch states smoothly. Furthermore, each fault detection usually requires a fault detection after each relay or other type of switch is opened or closed, which consumes a lot of opening and closing times and time. In summary, the reliability and efficiency of existing power supply circuit fault detection methods are both low. Summary of the Invention

[0004] The main technical problem addressed in this application is how to improve the efficiency of fault detection while ensuring its reliability.

[0005] To solve the above-mentioned technical problems, the first technical solution adopted in this application is: a fault detection method for a power supply circuit, the power supply circuit including: an inverter module, one end of which is used to connect to an energy module; a first switch module, one end of which is connected to the other end of the inverter module; a second switch module, one end of which is connected to the other end of the first switch module; and a third switch module, one end of which is connected to the other end of the second switch module, the other end of which is used to connect to the power grid; the fault detection method includes: in response to the power grid being in a normal state, the enable control of the first switch module, the enable control of the second switch module, and the enable control of the third switch module all being in a normal state, and the inverter module being in a state of initial power-on, then executing a preset first detection action; in response to the power grid being in a normal state, at least one of the enable control of the first switch module, the enable control of the second switch module, and the enable control of the third switch module being in an abnormal state, then executing a preset second detection action and executing the first detection action; the first detection action includes performing a first type of fault detection on the second switch module and the third switch module respectively, and the second detection action includes performing a second type of fault detection on the first switch module.

[0006] To solve the above-mentioned technical problems, the second technical solution adopted in this application is: an electronic device, including: a memory and a processor; the memory is used to store program instructions, and the processor is used to execute the program instructions to implement the above-mentioned method.

[0007] The beneficial effects of this application are as follows: Unlike the prior art, the technical solution of this application performs fault detection on the power supply circuit. In the power supply circuit, the energy module is connected to the inverter module, and the inverter module is connected to the power grid through a first switch module, a second switch module, and a third switch module connected in series. Based on the aforementioned power supply circuit, firstly, when the power grid is detected to be in a normal state, and the enable control of the first switch module, the second switch module, and the third switch module are all in a normal state, but the inverter module is being powered on for the first time, fault detection can be performed on the second and third switch modules. Since this is the first power-on of the inverter module, although everything is temporarily judged to be normal, relevant fault detection is still required to ensure safety and improve the reliability of fault detection. At this time, since the probability of the first switch module, which is closer to the inverter module, failing is lower than that of the second and third switch modules, which are closer to the power grid, fault detection can be performed only on the second and third switch modules to improve the efficiency of fault detection. Secondly, when the power grid is detected to be in a normal state, but at least one of the enable control of the first switch module, the second switch module, and the third switch module is in an abnormal state, fault detection can be performed on all three switch modules to thoroughly investigate, determine the fault location, and improve the reliability of fault detection. Based on the above methods, the reliability of fault detection can be ensured while improving the efficiency of fault detection. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of one embodiment of the power supply circuit of this application;

[0010] Figure 2 This is a flowchart illustrating an embodiment of the fault detection method of this application;

[0011] Figure 3 This is a schematic diagram of the structure of an embodiment of the inverter module, the first switch module, the second switch module, and the third switch module of this application;

[0012] Figure 4 This is a schematic diagram of the structure of an embodiment of the electronic device of this application;

[0013] Figure 5 This is a schematic diagram of an embodiment of the computer-readable storage medium of this application.

[0014] Reference numerals: Inverter module 11, First switch module 12, First A-phase live wire switch 121, First B-phase live wire switch 122, First C-phase live wire switch 123, First neutral wire switch 124, Second switch module 13, Second A-phase live wire switch 131, Second B-phase live wire switch 132, Second C-phase live wire switch 133, Second neutral wire switch 134, Third switch module 14, Third A-phase live wire switch 141, Third B-phase live wire switch 142, Third C-phase live wire switch 143, Third neutral wire switch 144, Energy module 15, First load module 16, Second load module 17, Electronic device 20, Processor 21, Memory 22, Bus 23, Computer-readable storage medium 30, Program instructions 31. Detailed Implementation

[0015] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms within the context of this application.

[0018] This application proposes a fault detection method for power supply circuits.

[0019] See Figure 1 , Figure 1 This is a schematic diagram of one embodiment of the power supply circuit of this application, as shown below. Figure 1 As shown, the power supply circuit includes an inverter module 11, a first switch module 12, a second switch module 13, and a third switch module 14.

[0020] One end of the inverter module 11 is used to connect to the energy module 15.

[0021] One end of the first switch module 12 is connected to the other end of the inverter module 11.

[0022] One end of the second switch module 13 is connected to the other end of the first switch module 12.

[0023] One end of the third switch module 14 is connected to the other end of the second switch module 13, and the other end of the third switch module 14 is used to connect to the power grid.

[0024] Specifically, the power supply circuit may also include a first load module 16 and a second load module 17, with the first load module 16 connected to one end of the second switch module 13 and the second load module 17 connected to the other end of the third switch module 14.

[0025] The first load module 16 can be a local load, such as a household appliance or other type of load device, which is not limited here.

[0026] The second load module 17 can be a load that is directly connected to the power grid for a long time, such as a server or other type of equipment that requires long-term power supply, but this is not limited here.

[0027] The energy module 15 can be a photovoltaic module for generating electricity, an energy storage module for storing energy, or other modules that can supply energy to the aforementioned load modules; no specific limitation is made here.

[0028] See Figure 2 , Figure 2 This is a flowchart illustrating an embodiment of the fault detection method of this application, as shown below. Figure 2 As shown, the fault detection methods include:

[0029] Step S11: In response to the grid being in a normal state, the enable control of the first switch module 12, the enable control of the second switch module 13, and the enable control of the third switch module 14 are all in a normal state, and the inverter module 11 is in the state of first power-on, then the preset first detection action is executed.

[0030] Step S12: In response to the power grid being in a normal state, if at least one of the enable controls of the first switch module 12, the second switch module 13, and the third switch module 14 is in an abnormal state, then the preset second detection action and the first detection action are executed.

[0031] The first detection action includes performing a first fault detection on the second switch module 13 and the third switch module 14; the second detection action includes performing a second type of fault detection on the first switch module 12; and the third detection action includes performing a third type of fault detection on the second switch module 13 and the third switch module 14. In subsequent embodiments, the third detection action is performed when the corresponding conditions are met.

[0032] Specifically, steps S11 and S12 are parallel steps. When the power grid is detected to be in a normal state, and the enable control of the first switch module 12, the second switch module 13, and the third switch module 14 are all in a normal state, and the inverter module 11 is powered on for the first time, step S11 is executed. When the power grid is detected to be in a normal state, and at least one of the enable control of the first switch module 12, the second switch module 13, and the third switch module 14 is in an abnormal state, step S12 is executed. These two steps can be in any order under different circumstances, and are not limited here.

[0033] Regarding step S11, if the grid power supply is detected to be normal, and the enable control of the first switch module 12, the second switch module 13, and the third switch module 14 is also normal, and if the inverter module 11 is detected to be powered on for the first time, it can be determined that the inverter module 11 has not previously undergone a complete cycle of power-on, operation, power-off, and power-on again. Therefore, in order to ensure that the switch modules do not encounter any accidents when performing this cycle in the future, even if there are no abnormalities, it is best to perform fault detection on the second switch module 13 and the third switch module 14 to increase the possibility that the inverter module 11 can operate normally in the future. The fault detection performed when the inverter module 11 is powered on for the first time, while everything is normal, is a safety measure for reliability. The possibility of a fault at this time is relatively low. Therefore, in order to improve the efficiency of fault detection, fault detection can be performed on the second switch module 13 and the third switch module 14, while the first switch module 12, which is closer to the inverter module 11 and farther from the grid and has a relatively low probability of fault, is temporarily not detected. This way, the reliability of fault detection can be ensured while improving the efficiency of fault detection.

[0034] Regarding step S12, when it is detected that the power grid supply is normal, but the enable control of the first switch module, the second switch module, and the third switch module is abnormal, fault detection can be performed on the first switch module 12, the second switch module 13, and the third switch module 14 to ensure that no possible fault is missed, thereby minimizing the possibility of missed fault detection leading to a larger accident and further improving the reliability of fault detection.

[0035] Unlike existing technologies, the technical solution of this application performs fault detection on the power supply circuit. In the power supply circuit, the energy module is connected to the inverter module, and the inverter module is connected to the power grid through a first switch module, a second switch module, and a third switch module connected in series. Based on the aforementioned power supply circuit, firstly, when the power grid is detected to be in a normal state, and the enable control of the first switch module, the second switch module, and the third switch module are all in a normal state, but the inverter module is being powered on for the first time, fault detection can be performed on the second and third switch modules. Since this is the first power-on of the inverter module, although everything is temporarily judged to be normal, relevant fault detection is still required to ensure safety and improve the reliability of fault detection. At this time, since the probability of the first switch module, which is closer to the inverter module, failing is lower than that of the second and third switch modules, which are closer to the power grid, fault detection can be performed only on the second and third switch modules to improve the efficiency of fault detection. Secondly, when the power grid is detected to be in a normal state, but at least one of the enable control of the first switch module, the second switch module, and the third switch module is in an abnormal state, fault detection can be performed on all three switch modules to thoroughly investigate, determine the fault location, and improve the reliability of fault detection. Based on the above methods, the reliability of fault detection can be ensured while improving the efficiency of fault detection.

[0036] In one embodiment, see Figure 3 , Figure 3 This is a schematic diagram of the structure of an embodiment of the inverter module, the first switch module, the second switch module, and the third switch module of this application, as shown below. Figure 3 As shown, the first switch module 12 includes a first A-phase live wire switch 121, a first B-phase live wire switch 122, a first C-phase live wire switch 123, and a first neutral wire switch 124.

[0037] The second switch module 13 includes a second A-phase live wire switch 131, a second B-phase live wire switch 132, a second C-phase live wire switch 133, and a second neutral wire switch 134.

[0038] The third switch module 14 includes a third A-phase live wire switch 141, a third B-phase live wire switch 142, a third C-phase live wire switch 143, and a third neutral wire switch 144.

[0039] Inverter module 11, first A-phase live wire switch 121, second A-phase live wire switch 131, third A-phase live wire switch 141 and the power grid are connected in sequence.

[0040] Inverter module 11, first B-phase live wire switch 122, second B-phase live wire switch 132, third B-phase live wire switch 142 and the power grid are connected in sequence.

[0041] Inverter module 11, first C-phase live wire switch 123, second C-phase live wire switch 133, third C-phase live wire switch 143 and the power grid are connected in sequence.

[0042] Inverter module 11, first neutral line switch 124, second neutral line switch 134, third neutral line switch 144 and the power grid are connected in sequence.

[0043] In one embodiment, the fault detection method may further include:

[0044] Step S13: In response to the grid recovering from an abnormal state to a normal state, a preset third detection action is performed before the inverter module 11 is connected to the grid.

[0045] The third detection action includes performing a third type of fault detection on the second switch module 13 and the third switch module 14.

[0046] Specifically, steps S11, S12 and S13 are parallel steps, and the order of these three steps can be arbitrary under different circumstances, which is not limited here.

[0047] Regarding step S13, after the power grid is in an abnormal state, the inverter module 11 will typically disconnect from the grid and be powered by the energy module 15, which will then supply power to the corresponding load. After the power grid recovers from the abnormal state to a normal state, before the inverter module 11 reconnects to the grid, fault detection needs to be performed on the second switch module 13 and the third switch module 14. This reduces the possibility that the inverter module 11 may fail to reconnect to the grid smoothly, or fail to disconnect from the grid smoothly, or experience voltage instability when connecting to the grid. This prepares the system for reconnection and improves the reliability of the fault detection method.

[0048] In one embodiment, such as Figure 3 As shown, the second switch module 13 includes a second A-phase live wire switch 131 and a second neutral wire switch 134.

[0049] The third switch module 14 includes a third A-phase live wire switch 141 and a third neutral wire switch 144.

[0050] The inverter module 11, the first switch module 12, the second A-phase live wire switch 131, the third A-phase live wire switch 141, and the power grid are connected in sequence.

[0051] The inverter module 11, the first switch module 12, the second neutral line switch 134, the third neutral line switch 144, and the power grid are connected in sequence.

[0052] The steps for performing the preset first detection action may specifically include:

[0053] Open all switches in the first switch module 12, the second switch module 13 and the third switch module 14. In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that there is a sticking fault in the third A phase live wire switch 141 and the third neutral wire switch 144.

[0054] When the third phase A live wire switch 141 is closed, in response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the third neutral wire switch 144 has an adhesion fault.

[0055] When the third neutral line switch 144 is closed, in response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is greater than a preset voltage threshold, it is determined that the third A-phase live wire switch 141 and the third neutral line switch 144 have an open circuit fault. In addition, in response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired first voltage value is less than a preset voltage threshold, it is determined that the second A-phase live wire switch 131 and the second neutral line switch 134 have an adhesion fault.

[0056] When the second phase A live wire switch 131 is closed, in response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the second neutral wire switch 134 has an adhesion fault.

[0057] Specifically, such as Figure 3 As shown, the inverter module 11 is connected to the switches in the first switch module 12, the switches in the second switch module 13, the switches in the third switch module 14, and the power grid in sequence through the A-phase live wire, B-phase live wire, C-phase live wire, and N neutral wire.

[0058] The third voltage value is the voltage between the end of the second A-phase live wire switch 131 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the third voltage value is the voltage between the end of the first A-phase live wire switch 121 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. Specifically, the third voltage value can refer to the voltage between A2 and N2.

[0059] The second voltage value is the voltage between the terminal of the third phase A live wire switch 141 furthest from the power grid and the terminal of the third neutral wire switch 144 furthest from the power grid. That is, the second voltage value can specifically refer to the voltage between A3 and N3.

[0060] The first voltage value is the voltage between the terminal of the third phase A live wire switch 141 near the power grid and the terminal of the third neutral wire switch 144 near the power grid. That is, the first voltage value can specifically refer to the voltage between A4 and N4.

[0061] Furthermore, after determining that the second neutral line switch 134 has a sticking fault in response to the judgment result that the absolute value of the difference between the third voltage value and the first voltage value is less than a preset voltage threshold when the second phase A live wire switch 131 is closed, the step of performing the first detection action may further include:

[0062] When the second neutral line switch 134 is closed, in response to the judgment result that the absolute value of the difference between the third voltage value and the first voltage value is greater than the preset voltage threshold, it is determined that there is an open circuit fault in the second phase A live line switch 131 and the second neutral line switch 134.

[0063] The preset voltage threshold can be 20 volts, 30 volts, or 40 volts, or other volt values, depending on the actual needs. No specific limit is set here.

[0064] Based on the above method, when testing a switch module (such as the second switch module 13 or the third switch module 14), all switches can be opened first, and then the live wire switch and the neutral wire switch can be closed in sequence. This allows for the detection of whether the neutral wire switch in the switch module has a sticking fault or an open circuit fault. In other words, during the testing of a switch module, each switch is opened and closed at most once. By combining this switch sequence with corresponding fault detection, comprehensive fault detection of the neutral wire switch in the corresponding switch module can be achieved with as few switching operations as possible. This improves the efficiency of fault detection while ensuring the reliability of the fault detection as much as possible.

[0065] Optionally, the second switch module 13 further includes a second B-phase live wire switch 132 and a second C-phase live wire switch 133.

[0066] The third switch module 14 also includes a third B-phase live wire switch 142 and a third C-phase live wire switch 143.

[0067] Inverter module 11, first switch module 12, second B-phase live wire switch 132, third B-phase live wire switch 142 and the power grid are connected in sequence.

[0068] Inverter module 11, first switch module 12, second C-phase live wire switch 133, third C-phase live wire switch 143 and the power grid are connected in sequence.

[0069] After closing the second phase A live wire switch 131, the step of performing the preset first detection action may further include:

[0070] Open all the live wire switches in the second switch module 13 and the third switch module 14, and close all the neutral wire switches in the second switch module 13 and the third switch module 14.

[0071] In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than a preset voltage threshold, it is determined that the third phase A live wire switch 141 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is less than a preset voltage threshold, it is determined that the third phase B live wire switch 142 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is less than a preset voltage threshold, it is determined that the third phase C live wire switch 143 has a sticking fault.

[0072] Close all the live wire switches in the third switch module 14.

[0073] In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is greater than a preset voltage threshold, it is determined that the third phase A live wire switch 141 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is greater than a preset voltage threshold, it is determined that the third phase B live wire switch 142 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is greater than a preset voltage threshold, it is determined that the third phase C live wire switch 143 has an open circuit fault.

[0074] Specifically, the sixth voltage value is the voltage between the terminal of the third B-phase live wire switch 142 furthest from the power grid and the terminal of the third neutral wire switch 144 furthest from the power grid. That is, the sixth voltage value can specifically refer to the voltage between B3 and N3.

[0075] The fifth voltage value is the voltage between the terminal of the third phase B live wire switch 142 closest to the power grid and the terminal of the third neutral wire switch 144 closest to the power grid. Specifically, the fifth voltage value can refer to the voltage between B4 and N4.

[0076] The tenth voltage value is the voltage between the terminal furthest from the grid of the third C-phase live wire switch 143 and the terminal furthest from the grid of the third neutral wire switch 144. Specifically, the tenth voltage value can refer to the voltage between C3 and N3.

[0077] The ninth voltage value is the voltage between the terminal of the third C-phase live wire switch 143 closest to the power grid and the terminal of the third neutral wire switch 144 closest to the power grid. Specifically, the ninth voltage value can refer to the voltage between C4 and N4.

[0078] Based on the above method, and building upon the comprehensive fault detection of the neutral line switch mentioned earlier, a comprehensive fault detection is further performed on each live wire switch of the third switch module 14. During the detection of the live wire switches, each switch is turned on and off at most once. By combining this switching sequence with corresponding fault detection, a comprehensive fault detection of the live wire switches in the corresponding switch module can be achieved with as few switching operations as possible. This ensures the reliability of fault detection as much as possible while improving the efficiency of fault detection.

[0079] Furthermore, after the step of closing all the live wire switches in the third switch module 14, the step of performing a preset first detection action may further include:

[0080] In response to the judgment result that the absolute value of the difference between the third voltage value and the first voltage value is less than a preset voltage threshold, it is determined that the second phase A live wire switch 131 has an adhesion fault, and / or, in response to the judgment result that the absolute value of the difference between the seventh voltage value and the fifth voltage value is less than a preset voltage threshold, it is determined that the second phase B live wire switch 132 has an adhesion fault, and / or, in response to the judgment result that the absolute value of the difference between the eleventh voltage value and the ninth voltage value is less than a preset voltage threshold, it is determined that the second phase C live wire switch 133 has an adhesion fault.

[0081] Close all the live wire switches in the second switch module 13.

[0082] In response to the judgment result that the absolute value of the difference between the third voltage value and the first voltage value is greater than a preset voltage threshold, it is determined that the second phase A live wire switch 131 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the seventh voltage value and the fifth voltage value is greater than a preset voltage threshold, it is determined that the second phase B live wire switch 132 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the eleventh voltage value and the ninth voltage value is greater than a preset voltage threshold, it is determined that the second phase C live wire switch 133 has an open circuit fault.

[0083] Specifically, the seventh voltage value is the voltage between the end of the second B-phase live wire switch 132 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the seventh voltage value is the voltage between the end of the first B-phase live wire switch 122 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. That is, the seventh voltage value can specifically refer to the voltage between B2 and N2.

[0084] The eleventh voltage value is the voltage between the end of the second C-phase live wire switch 133 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the eleventh voltage value is the voltage between the end of the first C-phase live wire switch 123 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. That is, the eleventh voltage value can specifically refer to the voltage between C2 and N2.

[0085] In the above embodiments, the steps of performing the preset first detection action include performing a first fault detection on the second switch module 13 and the third switch module 14.

[0086] The preset voltage threshold can be 20 volts, 30 volts, or 40 volts, or other volt values, depending on the actual needs. No specific limit is set here.

[0087] Based on the above method, and building upon the comprehensive fault detection of the neutral line switch achieved above, comprehensive fault detection is further performed on each live wire switch of the second switch module 13 and the third switch module 14. During the detection of the live wire switches, each switch is turned on and off at most once. By combining this switching sequence with corresponding fault detection, comprehensive fault detection of the live wire switches in the corresponding switch modules can be achieved with as few switching operations as possible. This ensures the reliability of fault detection as much as possible while improving the efficiency of fault detection.

[0088] In one embodiment, such as Figure 3 As shown, the first switch module 12 includes a first A-phase live wire switch 121, a first B-phase live wire switch 122, a first C-phase live wire switch 123, and a first neutral wire switch 124.

[0089] Inverter module 11, first A-phase live wire switch 121, second switch module 13, third switch module 14 and the power grid are connected in sequence.

[0090] Inverter module 11, first B-phase live wire switch 122, second switch module 13, third switch module 14 and the power grid are connected in sequence.

[0091] Inverter module 11, first C-phase live wire switch 123, second switch module 13, third switch module 14 and the power grid are connected in sequence.

[0092] Inverter module 11, first neutral line switch 124, second switch module 13, third switch module 14 and the power grid are connected in sequence.

[0093] Execute the preset second detection action and execute the first detection action, including:

[0094] The inverter module 11 is powered on by the power supply from the energy module 15, and the voltage signal output by the inverter module 11 is synchronized with the voltage signal output by the grid.

[0095] Open all the live wire switches in the first switch module 12 and close the first neutral wire switch 124.

[0096] In response to the judgment result that the absolute value of the difference between the currently acquired fourth voltage value and the currently acquired third voltage value is less than a preset voltage threshold, it is determined that the first A-phase live wire switch 121 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eighth voltage value and the currently acquired seventh voltage value is less than a preset voltage threshold, it is determined that the first B-phase live wire switch 122 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired twelfth voltage value and the currently acquired eleventh voltage value is less than a preset voltage threshold, it is determined that the first C-phase live wire switch 123 has a sticking fault.

[0097] The above steps involve performing a second type of fault detection on the first switch module 12.

[0098] Perform the first detection action.

[0099] Specifically, the fourth voltage value is the voltage between the terminal of the first A-phase live wire switch 121 furthest from the power grid and the terminal of the first neutral wire switch 124 furthest from the power grid. That is, the fourth voltage value can specifically refer to the voltage between A1 and N1.

[0100] The third voltage value is the voltage between the end of the second A-phase live wire switch 131 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the third voltage value is the voltage between the end of the first A-phase live wire switch 121 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. Specifically, the third voltage value can refer to the voltage between A2 and N2.

[0101] The eighth voltage value is the voltage between the terminal of the first B-phase live wire switch 122 furthest from the power grid and the terminal of the first neutral wire switch 124 furthest from the power grid. That is, the eighth voltage value can specifically refer to the voltage between B1 and N1.

[0102] The seventh voltage value is the voltage between the end of the second B-phase live wire switch 132 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the voltage between the end of the first B-phase live wire switch 122 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. Specifically, the seventh voltage value can refer to the voltage between B2 and N2.

[0103] The twelfth voltage value is the voltage between the end of the first C-phase live wire switch 123 furthest from the power grid and the end of the first neutral wire switch 124 furthest from the power grid. That is, the twelfth voltage value can specifically refer to the voltage between C1 and N1.

[0104] The eleventh voltage value is the voltage between the end of the second C-phase live wire switch 133 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the eleventh voltage value is the voltage between the end of the first C-phase live wire switch 123 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. That is, the eleventh voltage value can specifically refer to the voltage between C2 and N2.

[0105] It should be noted that the first detection action is to perform fault detection on the second switch module 13 and the third switch module 14. When the power grid is detected to be normal, but the enable control of the first switch module 12, the second switch module 13 and the third switch module 14 is abnormal, it is necessary to detect the first switch module 12, the second switch module 13 and the third switch module 14 to determine the specific location of the fault and to prevent the phenomenon of missed detection.

[0106] Therefore, before performing the first detection action, the inverter module 11 can be turned on and the voltage signal output by the inverter module 11 to the first switch module 12 can be synchronized with the voltage signal provided by the restored power grid, that is, synchronized in phase and voltage amplitude. At this time, the fault detection of the live wire switch and neutral wire switch of the first switch module 12 can be performed first, and the first detection action can be performed after the detection is completed to realize the fault detection of the live wire switch and neutral wire switch of the second switch module 13 and the third switch module 14. Thus, the fault detection of all switches of the first switch module 12, the second switch module 13 and the third switch module 14 can be realized, which can maximize the possibility of finding the fault location and improve the reliability of the fault detection method.

[0107] In one embodiment, such as Figure 3 As shown, the second switch module 13 includes a second A-phase live wire switch 131, a second B-phase live wire switch 132, a second C-phase live wire switch 133, and a second neutral wire switch 134.

[0108] The third switch module 14 includes a third A-phase live wire switch 141, a third B-phase live wire switch 142, a third C-phase live wire switch 143, and a third neutral wire switch 144.

[0109] Inverter module 11, first switch module 12, second A-phase live wire switch 131, third A-phase live wire switch 141 and the power grid are connected in sequence.

[0110] Inverter module 11, first switch module 12, second B-phase live wire switch 132, third B-phase live wire switch 142 and the power grid are connected in sequence.

[0111] Inverter module 11, first switch module 12, second C-phase live wire switch 133, third C-phase live wire switch 143 and the power grid are connected in sequence.

[0112] Inverter module 11, first switch module 12, second neutral line switch 134, third neutral line switch 144 and the power grid are connected in sequence.

[0113] The steps for performing the preset third detection action may specifically include:

[0114] Close all switches in the first switch module 12, and open all switches in the second switch module 13 and the third switch module 14.

[0115] The inverter module 11 is powered on by the power supply from the energy module 15, and the voltage signal output by the inverter module 11 is synchronized with the voltage signal output by the grid.

[0116] Close all neutral line switches in the second switch module 13 and the third switch module 14.

[0117] In response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired second voltage value is less than a preset voltage threshold, it is determined that the second A-phase live wire switch 131 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired seventh voltage value and the currently acquired sixth voltage value is less than a preset voltage threshold, it is determined that the second B-phase live wire switch 132 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eleventh voltage value and the currently acquired tenth voltage value is less than a preset voltage threshold, it is determined that the second C-phase live wire switch 133 has a sticking fault, and / Or, in response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than a preset voltage threshold, it is determined that the third A-phase live wire switch 141 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is less than a preset voltage threshold, it is determined that the third B-phase live wire switch 142 has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is less than a preset voltage threshold, it is determined that the third C-phase live wire switch 143 has a sticking fault.

[0118] Specifically, the third voltage value is the voltage between the end of the second A-phase live wire switch 131 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the third voltage value is the voltage between the end of the first A-phase live wire switch 121 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. That is, the third voltage value can specifically refer to the voltage between A2 and N2.

[0119] The second voltage value is the voltage between the terminal of the third phase A live wire switch 141 furthest from the power grid and the terminal of the third neutral wire switch 144 furthest from the power grid. That is, the second voltage value can specifically refer to the voltage between A3 and N3.

[0120] The first voltage value is the voltage between the terminal of the third phase A live wire switch 141 near the power grid and the terminal of the third neutral wire switch 144 near the power grid. That is, the first voltage value can specifically refer to the voltage between A4 and N4.

[0121] The seventh voltage value is the voltage between the end of the second B-phase live wire switch 132 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the voltage between the end of the first B-phase live wire switch 122 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. Specifically, the seventh voltage value can refer to the voltage between B2 and N2.

[0122] The sixth voltage value is the voltage between the terminal of the third phase B live wire switch 142 furthest from the power grid and the terminal of the third neutral wire switch 144 furthest from the power grid. That is, the sixth voltage value can specifically refer to the voltage between B3 and N3.

[0123] The fifth voltage value is the voltage between the terminal of the third phase B live wire switch 142 closest to the power grid and the terminal of the third neutral wire switch 144 closest to the power grid. Specifically, the fifth voltage value can refer to the voltage between B4 and N4.

[0124] The eleventh voltage value is the voltage between the end of the second C-phase live wire switch 133 furthest from the power grid and the end of the second neutral wire switch 134 furthest from the power grid, or the eleventh voltage value is the voltage between the end of the first C-phase live wire switch 123 closest to the power grid and the end of the first neutral wire switch 124 closest to the power grid. That is, the eleventh voltage value can specifically refer to the voltage between C2 and N2.

[0125] The tenth voltage value is the voltage between the terminal furthest from the grid of the third C-phase live wire switch 143 and the terminal furthest from the grid of the third neutral wire switch 144. Specifically, the tenth voltage value can refer to the voltage between C3 and N3.

[0126] The ninth voltage value is the voltage between the terminal of the third C-phase live wire switch 143 closest to the power grid and the terminal of the third neutral wire switch 144 closest to the power grid. Specifically, the ninth voltage value can refer to the voltage between C4 and N4.

[0127] After a grid anomaly, inverter module 11 typically disconnects from the grid and is powered by energy module 15, which then supplies power to the corresponding load. Once the grid resumes normal operation, before inverter module 11 reconnects to the grid, it can maintain power supply to the first load module 16. This means keeping all switches of the first switch module 12 closed, while all switches of the second switch module 13 and the third switch module 14 are open, ensuring that the voltage signal output by inverter module 11 is synchronized with the voltage signal output by the grid.

[0128] Subsequently, all neutral line switches in the second switch module 13 and the third switch module 14 can be closed, and the voltage values ​​at the corresponding points can be detected to detect whether there is a sticking fault in each switch in the second switch module 13 and the third switch module 14.

[0129] Optionally, the steps for performing the third detection action may further include:

[0130] Close all the live wire switches in the second switch module 13.

[0131] In response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired second voltage value is greater than a preset voltage threshold, it is determined that the second phase A live wire switch 131 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired seventh voltage value and the currently acquired sixth voltage value is greater than a preset voltage threshold, it is determined that the second phase B live wire switch 132 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eleventh voltage value and the currently acquired tenth voltage value is greater than a preset voltage threshold, it is determined that the second phase C live wire switch 133 has an open circuit fault.

[0132] Specifically, after detecting whether there is a sticking fault in each switch in the second switch module 13, the live wire switches in the second switch module 13 and the third switch module 14 can be closed sequentially to detect whether there is an open circuit fault in the live wire switches of the two switch modules respectively. Thus, based on the execution of the above-mentioned third detection action, the sticking fault and open circuit fault of each switch can be detected with as few switch opening and closing times as possible, under safe and standardized conditions, further improving the efficiency of fault detection while ensuring the reliability of fault detection.

[0133] Furthermore, the steps for performing the third detection action may specifically include:

[0134] Turn on all the live wire switches in the second switch module 13 and close all the live wire switches in the third switch module 14.

[0135] In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is greater than a preset voltage threshold, it is determined that the third phase A live wire switch 141 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is greater than a preset voltage threshold, it is determined that the third phase B live wire switch 142 has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is greater than a preset voltage threshold, it is determined that the third phase C live wire switch 143 has an open circuit fault.

[0136] Specifically, after detecting whether there is a sticking fault in each switch in the third switch module 14, the live wire switches in the second switch module 13 and the third switch module 14 can be closed sequentially to detect whether there is an open circuit fault in the live wire switches of the two switch modules respectively. Thus, based on the execution of the above-mentioned third detection action, the sticking fault and open circuit fault of each switch can be detected with as few switch opening and closing times as possible, under safe and standardized conditions, further improving the efficiency of fault detection while ensuring the reliability of fault detection.

[0137] In the above embodiments, the steps of performing the preset third detection action include performing a third fault detection on the second switch module 13 and the third switch module 14.

[0138] In one embodiment, if an adhesion fault is detected in the preceding embodiments, the fault detection method may further include:

[0139] In response to the detection of a sticking fault in the target switch, the frequency and / or angular frequency of the first voltage signal are acquired, and the frequency and / or angular frequency of the second voltage signal are acquired.

[0140] If the absolute value of the difference between the frequency of the first voltage signal and the frequency of the second voltage signal is greater than a preset frequency difference, or if the absolute value of the difference between the angular frequency of the first voltage signal and the angular frequency of the second voltage signal is greater than a preset angular frequency difference, then the target switch is updated to determine that there is no sticking fault.

[0141] The target switch is one of the switches in the first switch module 12, the second switch module 13, and the third switch module 14.

[0142] The first voltage signal is the voltage signal between the remote end of the target switch and the remote end of the neutral line switch in the switch module to which the target switch belongs.

[0143] The second voltage signal is the voltage signal between the terminal of the target switch near the power grid and the terminal of the neutral line switch in the switch module to which the target switch belongs, which is also near the power grid.

[0144] Specifically, the target switch can be any one of the first switch module 12, the second switch module 13, and the third switch module 14. It can be a live wire switch or a neutral wire switch, without limitation here. For example, if the target switch is the third A-phase live wire switch 141 in the third switch module 14, then the first voltage signal is the voltage signal corresponding to the second voltage value, and the second voltage signal is the voltage signal corresponding to the first voltage value.

[0145] After detecting and determining that the target switch has a sticking fault, the frequency and angular frequency of the first and second voltage signals can be extracted using a phase-locked loop (PLL) method. Based on the comparison of the frequency and angular frequency, it can be determined whether the first and second voltage signals are in phase or have similar phases. If the phase difference is large, it can be determined that the first and second voltage signals are out of phase, and the aforementioned sticking fault in the target switch is a false alarm. Specifically, the PLL method can be SOGI_PLL phase-locked loop technology, or other types of PLL technology capable of extracting the frequency and angular frequency of the corresponding voltage signals. The specific method can be determined according to actual needs and is not limited here.

[0146] Based on the above method, when the target switch is found to have a sticking fault, it is possible to further detect whether the fault is misjudged due to the different phases of the voltage signals at its two ends. This reduces the possibility of more accidents or waste of components caused by fault misjudgment and further improves the reliability of fault detection.

[0147] This application also proposes an electronic device, see [link to document]. Figure 4 , Figure 4 This is a schematic diagram of an embodiment of the electronic device of this application, as shown below. Figure 4 As shown, the electronic device 20 includes a processor 21, a memory 22, and a bus 23.

[0148] The processor 21 and the memory 22 are respectively connected to the bus 23. The memory 22 stores program instructions, and the processor 21 is used to execute the program instructions to implement the fault detection method in the above embodiment.

[0149] In this embodiment, processor 21 can also be referred to as CPU (Central Processing Unit). Processor 21 may be an integrated circuit chip with signal processing capabilities. Processor 21 can also be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor, or processor 21 can be any conventional processor.

[0150] Unlike existing technologies, the technical solution of this application performs fault detection on the power supply circuit. In the power supply circuit, the energy module is connected to the inverter module, and the inverter module is connected to the power grid through a first switch module, a second switch module, and a third switch module connected in series. Based on the aforementioned power supply circuit, firstly, when the power grid is detected to be in a normal state, and the enable control of the first switch module, the second switch module, and the third switch module are all in a normal state, but the inverter module is being powered on for the first time, fault detection can be performed on the second and third switch modules. Since this is the first power-on of the inverter module, although everything is temporarily judged to be normal, relevant fault detection is still required to ensure safety and improve the reliability of fault detection. At this time, since the probability of the first switch module, which is closer to the inverter module, failing is lower than that of the second and third switch modules, which are closer to the power grid, fault detection can be performed only on the second and third switch modules to improve the efficiency of fault detection. Secondly, when the power grid is detected to be in a normal state, but at least one of the enable control of the first switch module, the second switch module, and the third switch module is in an abnormal state, fault detection can be performed on all three switch modules to thoroughly investigate, determine the fault location, and improve the reliability of fault detection. Based on the above methods, the reliability of fault detection can be ensured while improving the efficiency of fault detection.

[0151] This application also proposes a computer-readable storage medium, see [link to relevant documentation] Figure 5 , Figure 5 This is a schematic diagram of the structure of an embodiment of the computer-readable storage medium of this application, as shown below. Figure 5 As shown, the computer-readable storage medium 30 stores program instructions 31 thereon, which, when executed by a processor (not shown), implement the fault detection method in the above embodiments.

[0152] In this embodiment, the computer-readable storage medium 30 may be, but is not limited to, a USB flash drive, SD card, PD optical drive, portable hard drive, high-capacity floppy drive, flash memory, multimedia memory card, storage unit in a server, FPGA, or ASIC, etc.

[0153] Unlike existing technologies, the technical solution of this application performs fault detection on the power supply circuit. In the power supply circuit, the energy module is connected to the inverter module, and the inverter module is connected to the power grid through a first switch module, a second switch module, and a third switch module connected in series. Based on the aforementioned power supply circuit, firstly, when the power grid is detected to be in a normal state, and the enable control of the first switch module, the second switch module, and the third switch module are all in a normal state, but the inverter module is being powered on for the first time, fault detection can be performed on the second and third switch modules. Since this is the first power-on of the inverter module, although everything is temporarily judged to be normal, relevant fault detection is still required to ensure safety and improve the reliability of fault detection. At this time, since the probability of the first switch module, which is closer to the inverter module, failing is lower than that of the second and third switch modules, which are closer to the power grid, fault detection can be performed only on the second and third switch modules to improve the efficiency of fault detection. Secondly, when the power grid is detected to be in a normal state, but at least one of the enable control of the first switch module, the second switch module, and the third switch module is in an abnormal state, fault detection can be performed on all three switch modules to thoroughly investigate, determine the fault location, and improve the reliability of fault detection. Based on the above methods, the reliability of fault detection can be ensured while improving the efficiency of fault detection.

[0154] In the description of this application, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0155] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0156] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0157] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (which may be a personal computer, server, network device, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0158] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A fault detection method for a power supply circuit, characterized in that, The power supply circuit includes: An inverter module, one end of which is used to connect to an energy module; A first switching module, one end of which is connected to the other end of the inverter module; A second switch module, one end of which is connected to the other end of the first switch module; A third switch module, one end of which is connected to the other end of the second switch module, and the other end of the third switch module is used to connect to the power grid; The fault detection method includes: In response to the power grid being in a normal state, the enable control of the first switch module, the enable control of the second switch module, and the enable control of the third switch module are all in a normal state, and the inverter module is in the state of first power-on, then the preset first detection action is executed. In response to the power grid being in a normal state, if at least one of the enable controls of the first switch module, the second switch module, and the third switch module is in an abnormal state, then a preset second detection action and the first detection action are executed. The first detection action includes performing a first type of fault detection on the second switch module and the third switch module respectively, and the second detection action includes performing a second type of fault detection on the first switch module.

2. The fault detection method according to claim 1, characterized in that, The fault detection method further includes: In response to the power grid returning to a normal state from an abnormal state, a preset third detection action is performed before the inverter module is connected to the power grid; The third detection action includes performing a third type of fault detection on the second switch module and the third switch module.

3. The fault detection method according to claim 1 or 2, characterized in that, The second switch module includes a second A-phase live wire switch and a second neutral wire switch; The third switch module includes a third A-phase live wire switch and a third neutral wire switch; The inverter module, the first switch module, the second A-phase live wire switch, the third A-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first switch module, the second neutral line switch, the third neutral line switch, and the power grid are connected in sequence; The execution of the preset first detection action includes: Open all switches in the first switch module, the second switch module, and the third switch module. In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than a preset voltage threshold, determine that the third A-phase live wire switch and the third neutral wire switch have a sticking fault. When the third phase A live wire switch is closed, in response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the third neutral wire switch has a sticking fault. When the third neutral line switch is closed, in response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is greater than the preset voltage threshold, it is determined that the third A-phase live wire switch and the third neutral line switch have an open circuit fault. In addition, in response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the second A-phase live wire switch and the second neutral line switch have an adhesion fault. When the second phase A live wire switch is closed, in response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the second neutral wire switch has a sticking fault. Wherein, the third voltage value is the voltage value between the terminal of the second phase A live wire switch away from the power grid and the terminal of the second neutral wire switch away from the power grid; The second voltage value is the voltage value between the terminal furthest from the power grid of the third phase A live wire switch and the terminal furthest from the power grid of the third neutral wire switch; The first voltage value is the voltage value between the terminal of the third phase A live wire switch near the power grid and the terminal of the third neutral wire switch near the power grid.

4. The fault detection method according to claim 3, characterized in that, The second switch module also includes a second B-phase live wire switch and a second C-phase live wire switch; The third switch module also includes a third B-phase live wire switch and a third C-phase live wire switch; The inverter module, the first switch module, the second B-phase live wire switch, the third B-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first switch module, the second C-phase live wire switch, the third C-phase live wire switch, and the power grid are connected in sequence. After the step of closing the second phase A live wire switch, the execution of the preset first detection action further includes: Open all live wire switches in the second and third switch modules, and close all neutral wire switches in the second and third switch modules; In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the third A phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is less than the preset voltage threshold, it is determined that the third B phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is less than the preset voltage threshold, it is determined that the third C phase live wire switch has a sticking fault; Wherein, the sixth voltage value is the voltage value between the terminal of the third B-phase live wire switch away from the power grid and the terminal of the third neutral wire switch away from the power grid; The fifth voltage value is the voltage value between the terminal of the third B-phase live wire switch near the power grid and the terminal of the third neutral wire switch near the power grid. The tenth voltage value is the voltage value between the terminal of the third C-phase live wire switch away from the power grid and the terminal of the third neutral wire switch away from the power grid. The ninth voltage value is the voltage between the terminal of the third C-phase live wire switch near the power grid and the terminal of the third neutral wire switch near the power grid.

5. The fault detection method according to claim 4, characterized in that, After the step of closing all neutral line switches in the second and third switch modules, the execution of the preset first detection action further includes: Close all live wire switches in the third switch module; In response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is greater than the preset voltage threshold, it is determined that the third A-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is greater than the preset voltage threshold, it is determined that the third B-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is greater than the preset voltage threshold, it is determined that the third C-phase live wire switch has an open circuit fault.

6. The fault detection method according to claim 5, characterized in that, After the step of closing all the live wire switches in the third switch module, the execution of the preset first detection action further includes: In response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the second A-phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired seventh voltage value and the currently acquired fifth voltage value is less than the preset voltage threshold, it is determined that the second B-phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eleventh voltage value and the currently acquired ninth voltage value is less than the preset voltage threshold, it is determined that the second C-phase live wire switch has a sticking fault; Wherein, the seventh voltage value is the voltage value between the terminal of the second B-phase live wire switch away from the power grid and the terminal of the second neutral wire switch away from the power grid; The eleventh voltage value is the voltage between the terminal furthest from the grid of the second C-phase live wire switch and the terminal furthest from the grid of the second neutral wire switch.

7. The fault detection method according to claim 6, characterized in that, After the step of closing all the live wire switches in the third switch module, the execution of the preset first detection action further includes: Close all live wire switches in the second switch module; In response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired first voltage value is greater than the preset voltage threshold, it is determined that the second A-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired seventh voltage value and the currently acquired fifth voltage value is greater than the preset voltage threshold, it is determined that the second B-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eleventh voltage value and the currently acquired ninth voltage value is greater than the preset voltage threshold, it is determined that the second C-phase live wire switch has an open circuit fault.

8. The fault detection method according to claim 1 or 2, characterized in that, The first switch module includes a first A-phase live wire switch, a first B-phase live wire switch, a first C-phase live wire switch, and a first neutral wire switch; The inverter module, the first A-phase live wire switch, the second switch module, the third switch module, and the power grid are connected in sequence. The inverter module, the first B-phase live wire switch, the second switch module, the third switch module, and the power grid are connected in sequence. The inverter module, the first C-phase live wire switch, the second switch module, the third switch module, and the power grid are connected in sequence. The inverter module, the first neutral line switch, the second switch module, the third switch module, and the power grid are connected in sequence. The execution of the preset second detection action and the execution of the first detection action include: The inverter module is controlled to start up based on the power supply from the energy module, and the voltage signal output by the inverter module is synchronized with the voltage signal output by the power grid. Open all the live wire switches in the first switch module and close the first neutral wire switch; In response to the judgment result that the absolute value of the difference between the currently acquired fourth voltage value and the currently acquired third voltage value is less than a preset voltage threshold, it is determined that the first A-phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eighth voltage value and the currently acquired seventh voltage value is less than the preset voltage threshold, it is determined that the first B-phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired twelfth voltage value and the currently acquired eleventh voltage value is less than the preset voltage threshold, it is determined that the first C-phase live wire switch has a sticking fault; Perform the first detection action; Wherein, the fourth voltage value is the voltage value between the terminal of the first A-phase live wire switch away from the power grid and the terminal of the first neutral wire switch away from the power grid; The third voltage value is the voltage value between the terminal of the first phase A live wire switch near the power grid and the terminal of the first neutral wire switch near the power grid. The eighth voltage value is the voltage between the terminal of the first B-phase live wire switch away from the power grid and the terminal of the first neutral wire switch away from the power grid. The seventh voltage value is the voltage value between the terminal of the first B-phase live wire switch near the power grid and the terminal of the first neutral wire switch near the power grid. The twelfth voltage value is the voltage between the terminal furthest from the grid of the first C-phase live wire switch and the terminal furthest from the grid of the first neutral wire switch. The eleventh voltage value is the voltage between the terminal of the first C-phase live wire switch near the power grid and the terminal of the first neutral wire switch near the power grid.

9. The fault detection method according to claim 2, characterized in that, The second switch module includes a second A-phase live wire switch, a second B-phase live wire switch, a second C-phase live wire switch, and a second neutral wire switch; The third switch module includes a third A-phase live wire switch, a third B-phase live wire switch, a third C-phase live wire switch, and a third neutral wire switch; The inverter module, the first switch module, the second A-phase live wire switch, the third A-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first switch module, the second B-phase live wire switch, the third B-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first switch module, the second C-phase live wire switch, the third C-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first switch module, the second neutral line switch, the third neutral line switch, and the power grid are connected in sequence; The execution of the preset third detection action includes: Close all switches in the first switch module, and open all switches in the second and third switch modules; The inverter module is controlled to start up based on the power supply from the energy module, and the voltage signal output by the inverter module is synchronized with the voltage signal output by the power grid. Close all neutral line switches in the second and third switch modules; In response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired second voltage value is less than a preset voltage threshold, it is determined that the second phase A live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired seventh voltage value and the currently acquired sixth voltage value is less than the preset voltage threshold, it is determined that the second phase B live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eleventh voltage value and the currently acquired tenth voltage value is less than the preset voltage threshold, it is determined that the second phase C live wire switch has a sticking fault, and / or Alternatively, in response to the judgment result that the absolute value of the difference between the currently acquired second voltage value and the currently acquired first voltage value is less than the preset voltage threshold, it is determined that the third A-phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired sixth voltage value and the currently acquired fifth voltage value is less than the preset voltage threshold, it is determined that the third B-phase live wire switch has a sticking fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired tenth voltage value and the currently acquired ninth voltage value is less than the preset voltage threshold, it is determined that the third C-phase live wire switch has a sticking fault; Wherein, the third voltage value is the voltage value between the terminal of the second phase A live wire switch away from the power grid and the terminal of the second neutral wire switch away from the power grid; The second voltage value is the voltage value between the terminal furthest from the power grid of the third phase A live wire switch and the terminal furthest from the power grid of the third neutral wire switch; The first voltage value is the voltage value between the terminal of the third phase A live wire switch near the power grid and the terminal of the third neutral wire switch near the power grid; The seventh voltage value is the voltage between the terminal furthest from the grid of the second phase B live wire switch and the terminal furthest from the grid of the second neutral wire switch. The sixth voltage value is the voltage value between the terminal of the third B-phase live wire switch away from the power grid and the terminal of the third neutral wire switch away from the power grid. The fifth voltage value is the voltage value between the terminal of the third B-phase live wire switch near the power grid and the terminal of the third neutral wire switch near the power grid. The eleventh voltage value is the voltage between the terminal furthest from the grid of the second C-phase live wire switch and the terminal furthest from the grid of the second neutral wire switch. The tenth voltage value is the voltage value between the terminal of the third C-phase live wire switch away from the power grid and the terminal of the third neutral wire switch away from the power grid. The ninth voltage value is the voltage between the terminal of the third C-phase live wire switch near the power grid and the terminal of the third neutral wire switch near the power grid.

10. The fault detection method according to claim 9, characterized in that, The execution of the preset third detection action also includes: Close all live wire switches in the second switch module; In response to the judgment result that the absolute value of the difference between the currently acquired third voltage value and the currently acquired second voltage value is greater than the preset voltage threshold, it is determined that the second A-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired seventh voltage value and the currently acquired sixth voltage value is greater than the preset voltage threshold, it is determined that the second B-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the currently acquired eleventh voltage value and the currently acquired tenth voltage value is greater than the preset voltage threshold, it is determined that the second C-phase live wire switch has an open circuit fault.

11. The fault detection method according to claim 10, characterized in that, The execution of the preset third detection action also includes: Turn on all the live wire switches in the second switch module and close all the live wire switches in the third switch module; In response to the judgment result that the absolute value of the difference between the second voltage value and the first voltage value is greater than the preset voltage threshold, it is determined that the third A-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the sixth voltage value and the fifth voltage value is greater than the preset voltage threshold, it is determined that the third B-phase live wire switch has an open circuit fault, and / or, in response to the judgment result that the absolute value of the difference between the tenth voltage value and the ninth voltage value is greater than the preset voltage threshold, it is determined that the third C-phase live wire switch has an open circuit fault.

12. The fault detection method according to claim 1, characterized in that, The fault detection method further includes: In response to the detection of a sticking fault in the target switch, the frequency and / or angular frequency of the first voltage signal are acquired, and the frequency and / or angular frequency of the second voltage signal are acquired. If the absolute value of the difference between the frequency of the first voltage signal and the frequency of the second voltage signal is greater than a preset frequency difference, or if the absolute value of the difference between the angular frequency of the first voltage signal and the angular frequency of the second voltage signal is greater than a preset angular frequency difference, then it is determined that the target switch does not have a sticking fault. The target switch is one of the first switch module, the second switch module, and the third switch module; The first voltage signal is the voltage signal between the remote terminal of the target switch and the remote terminal of the neutral line switch in the switch module to which the target switch belongs; The second voltage signal is the voltage signal between the terminal of the target switch near the power grid and the terminal of the neutral line switch in the switch module to which the target switch belongs, which is also near the power grid.

13. The fault detection method according to claim 1 or 2, characterized in that, The first switch module includes a first A-phase live wire switch, a first B-phase live wire switch, a first C-phase live wire switch, and a first neutral wire switch; The second switch module includes a second A-phase live wire switch, a second B-phase live wire switch, a second C-phase live wire switch, and a second neutral wire switch; The third switch module includes a third A-phase live wire switch, a third B-phase live wire switch, a third C-phase live wire switch, and a third neutral wire switch; The inverter module, the first A-phase live wire switch, the second A-phase live wire switch, the third A-phase live wire switch, and the power grid are connected in sequence; The inverter module, the first B-phase live wire switch, the second B-phase live wire switch, the third B-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first C-phase live wire switch, the second C-phase live wire switch, the third C-phase live wire switch, and the power grid are connected in sequence. The inverter module, the first neutral line switch, the second neutral line switch, the third neutral line switch, and the power grid are connected in sequence.

14. An electronic device, characterized in that, include: Memory and processor; The memory is used to store program instructions, and the processor is used to execute the program instructions to implement the method as described in any one of claims 1 to 13.

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