Three-phase wiring detection system

Abstract

The utility model relates to a three-phase wiring detection system, and the system comprises a confluence module which comprises a first terminal and a second terminal, and a first port, a second port and a third port of the first terminal are correspondingly connected with the live wire ends of a first micro-inverse module, a second micro-inverse module and a third micro-inverse module respectively. The fourth port of the first terminal is connected with the zero line end of each micro-inverse module, and the four ports of the second terminal are correspondingly connected with the four ports of the first terminal respectively; the first end of the switch control module is connected with the second terminal, the second end is connected to a three-phase power grid, and the switch control module comprises four switches correspondingly connected with a live wire and a zero wire of the three-phase power grid respectively; the gateway controller is connected to a three-phase power grid, is in wireless connection with each micro-inverse module, and is used for obtaining the port voltage of the micro-inverse module in a two-phase control state through wireless connection according to the phase sequence information corresponding to each micro-inverse module, determining whether a reverse connection fault exists or not based on the port voltage, and sending the reverse connection fault to the micro-inverse module. The system can improve the detection efficiency and accuracy of wiring detection.

Description

Technical Field

[0001] This application relates to the field of microinverter installation technology, and in particular to a three-phase wiring detection system. Background Technology

[0002] Mains power transmission is typically three-phase four-wire. Therefore, when installing a microinverter in a three-phase system, the microinverter for each phase is combined through a combiner module before being connected to the three-phase grid. When connecting the combiner module to the three-phase grid, the live and neutral wires may be reversed at the combiner point. If the live and neutral wires are reversed, the port voltage of the microinverter on two phases will reach 380V after AC power is applied, potentially damaging the microinverter. Currently, there is no good solution for wiring detection when a microinverter is connected to the three-phase grid through a combiner module; manual judgment is required, which suffers from low efficiency and poor accuracy. Utility Model Content

[0003] Therefore, it is necessary to provide a three-phase wiring detection system to address the above-mentioned technical problems, which can improve the detection efficiency and accuracy of faults caused by reverse connection of the neutral and live wires.

[0004] In a first aspect, this application provides a three-phase wiring detection system, including: a bus module, a switch control module, a gateway controller, and a first micro-reverse module, a second micro-reverse module, and a third micro-reverse module corresponding to the three phases;

[0005] The bus module includes a first terminal and a second terminal. The first port, the second port and the third port of the first terminal are respectively connected to the live wire of the first micro-inverter module, the live wire of the second micro-inverter module and the live wire of the third micro-inverter module. The fourth port of the first terminal is connected to the neutral wire of each micro-inverter module. The four ports of the second terminal are respectively connected to the four ports of the first terminal.

[0006] The first terminal of the switch control module is connected to the second terminal, and the second terminal of the switch control module is connected to the three-phase power grid. The switch control module includes a first switch, a second switch, a third switch, and a fourth switch that are respectively connected to the live wire and the neutral wire of the three-phase power grid.

[0007] The gateway controller is connected to the three-phase power grid and wirelessly connected to each micro-inverter module. It is used to obtain the port voltage of the corresponding micro-inverter module under two-phase control state through wireless connection and according to the phase sequence information of each micro-inverter module. Based on the port voltage, it determines whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal.

[0008] The two-phase control states include two independent connection states formed by sequentially and individually turning on any two of the first, second, and third switches, provided that the fourth switch is turned on.

[0009] In some embodiments, each microinverter module includes multiple microinverters connected in parallel, and the gateway controller is connected to the three-phase power grid and wirelessly connected to each of the microinverters.

[0010] The gateway controller is used to acquire the port voltage of each micro-inverter in the corresponding micro-inverter module under two-phase control state.

[0011] In some embodiments, the gateway controller is provided with a first wireless communication module, and each of the micro-inverters in the two micro-inverter modules corresponding to the two-phase control state is provided with a second wireless communication module.

[0012] The gateway controller is configured to send a first query message to the second wireless communication module via the first wireless communication module, the first query message being used to query the port voltage of the microinverter; and to receive a response message from the second wireless communication module for the first query message, the response message including the port voltage of the microinverter.

[0013] In some embodiments, the gateway controller is configured to determine that there is no reverse connection fault between the neutral and live wires at the second terminal when the port voltages of both micro-inverter modules are equal to a preset voltage; and to determine that there is a reverse connection fault between the neutral and live wires at the second terminal when the port voltage of at least one of the two micro-inverter modules is not equal to the preset voltage.

[0014] In some embodiments, the gateway controller is configured to determine, when the port voltages of the two micro-inverter modules are not equal to the preset voltage, that there is a reverse connection fault in the two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the first target micro-inverter module;

[0015] The first target micro-inverter module is one of the micro-inverter modules other than the first, second, and third micro-inverter modules.

[0016] In some embodiments, the gateway controller is configured to determine, when the port voltage of the second target micro-inverter module is not equal to the preset voltage, that there is a reverse connection fault in the two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the third target micro-inverter module;

[0017] The third target micro-inverter module is one of the two micro-inverter modules other than the second target micro-inverter module.

[0018] In some embodiments, the preset voltage includes 220V or 110V, and the case where it is not equal to the preset voltage refers to a port voltage of 0.

[0019] In some embodiments, the first switch, the second switch, the third switch, and the fourth switch are relays.

[0020] In some embodiments, the gateway controller is communicatively connected to the switch control module;

[0021] The gateway controller is used to control the two independent connection states of the switch control module through a communication connection, and to obtain the port voltage of the corresponding micro-inverter module in each independent connection state.

[0022] In some embodiments, the gateway controller is provided with a first 485 communication unit, and the switch control module is provided with a second 485 communication unit;

[0023] The gateway controller is used to send control commands to the second 485 communication unit through the first 485 communication unit to control the two independent connection states of the switch control module.

[0024] In some embodiments, the gateway controller is provided with a Bluetooth communication unit and / or a Wi-Fi communication unit;

[0025] The gateway controller is configured to receive a detection command sent by the terminal via the Bluetooth communication unit and / or the Wi-Fi communication unit. The detection command is used to indicate whether there is a fault of reverse connection between the neutral wire and the live wire.

[0026] In some embodiments, the gateway controller is further configured to receive phase sequence information corresponding to each micro-inverter module sent by the terminal via the Bluetooth communication unit and / or the Wi-Fi communication unit;

[0027] The terminal obtains the phase sequence information corresponding to each micro-inverter module in one of the following ways:

[0028] Scan the code corresponding to the phase sequence information, perform NFC communication, and receive user-entered information.

[0029] The aforementioned three-phase wiring detection system includes: a busbar module, a switch control module, a gateway controller, and three corresponding micro-inverter modules for the three phases: a first micro-inverter module, a second micro-inverter module, and a third micro-inverter module. The busbar module includes a first terminal and a second terminal. The first, second, and third ports of the first terminal are respectively connected to the live wires of the first, second, and third micro-inverter modules. The fourth port of the first terminal is connected to the neutral wire of each micro-inverter module. The four ports of the second terminal are respectively connected to the four ports of the first terminal. The first terminal of the switch control module is connected to the second terminal, and the second terminal of the switch control module... The system connects to a three-phase power grid. The switch control module includes a first switch, a second switch, a third switch, and a fourth switch, each corresponding to a live wire and a neutral wire of the three-phase power grid. The gateway controller connects to the three-phase power grid and wirelessly connects to each micro-inverter module. Through this wireless connection, based on the phase sequence information of each micro-inverter module, it acquires the port voltage of the corresponding micro-inverter module under two-phase control states. Based on the port voltage, it determines whether a neutral-live wire reverse connection fault exists at the second terminal. The two-phase control states include two independent connection states: with the fourth switch on, any two switches from the first, second, and third switches are sequentially turned on individually. This solution, by connecting the gateway controller wirelessly to each micro-inverter module and controlling each phase independently, allows the gateway controller to acquire the port voltage of the corresponding micro-inverter module under both independent connection states. These port voltages can accurately identify neutral-live wire reverse connection faults. Compared to traditional detection methods, this solution utilizes wireless communication for wiring detection, eliminating the need for manual data acquisition and manual inspection, thus improving the detection efficiency and accuracy of live-neutral wire reverse connection faults.

[0030] The aforementioned three-phase wiring detection system utilizes the wireless connection between the gateway controller and each micro-reverse module in the system, eliminating the need for complex wiring during wiring detection, simplifying the installation and debugging process, and making data acquisition more convenient. Furthermore, based on this system, the detection process can be achieved without any additional components, wiring, or measuring instruments, thus improving the convenience of detecting live and neutral wire reverse connection faults and reducing costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of a three-phase wiring detection system provided in this application embodiment;

[0033] Figure 2 This is a schematic diagram showing the connection of multiple micro-inverters in a micro-inverter module.

[0034] Figure 3 This is a schematic diagram of wireless communication interaction between a gateway controller 13 and a first micro-inverter module 14;

[0035] Figure 4 This is a schematic diagram of communication and interaction between a gateway controller 13 and a switch control module 12;

[0036] Figure 5 This is a schematic diagram of the structure of a switch control module 12;

[0037] Figure 6 This is a schematic diagram of the structure of a gateway controller 13. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] In this embodiment of the application, a three-phase wiring detection system is provided, which can improve the detection efficiency and accuracy of live wire and neutral wire reverse connection faults compared with traditional three-phase overall detection.

[0040] For example, Figure 1 This is a schematic diagram of a three-phase wiring detection system provided in an embodiment of this application. Figure 1 As shown, the system includes: a combiner module 11, a switch control module 12, a gateway controller 13, and a first micro-inverter module 14, a second micro-inverter module 15, and a third micro-inverter module 16 corresponding to the three phases.

[0041] The aforementioned bus module 11 includes a first terminal 111 and a second terminal 112. The first port 1, the second port 2 and the third port 3 of the first terminal 111 are respectively connected to the live wire of the first micro-inverter module, the live wire of the second micro-inverter module and the live wire of the third micro-inverter module. The fourth port 4 of the first terminal 111 is connected to the neutral wire of each micro-inverter module. The four ports of the second terminal 112 are respectively connected to the four ports of the first terminal 111.

[0042] The first end of the switch control module 12 is connected to the second terminal 112, and the second end of the switch control module 12 is connected to the three-phase power grid. The switch control module 12 includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4, which are respectively connected to the live wire and the neutral wire of the three-phase power grid.

[0043] The gateway controller 13 is connected to the three-phase power grid and wirelessly connected to each micro-inverter module. It is used to obtain the port voltage of the corresponding micro-inverter module under two-phase control state through wireless connection and according to the phase sequence information of each micro-inverter module. Based on the port voltage, it determines whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal. The two-phase control state includes two independent connection states formed by sequentially turning on any two of the first, second and third switches when the fourth switch is turned on.

[0044] In this embodiment of the application, three-phase live wire terminals and a neutral wire terminal are involved, wherein the three-phase live wire terminals are L1, L2, and L3, and the neutral wire terminal is represented as N. For example, as shown... Figure 1 As shown, the live wire terminal of the first micro-inverter module is L1, the live wire terminal of the second micro-inverter module is L2, and the live wire terminal of the third micro-inverter module is L3. The neutral wire terminal of the three micro-inverter modules is N. Figure 1 As shown, a three-phase power grid also involves three live wire terminals L1, L2 and L3, as well as a neutral wire terminal N.

[0045] In some embodiments, the above two-phase control states include: two independent connection states formed by sequentially and individually turning on the first switch K1 and the second switch K2, provided that the fourth switch K4 is turned on.

[0046] Among them, the above Figure 1 When the fourth switch K4 is on and the first switch K1 is on, the gateway controller 13 obtains the port voltage V1 corresponding to the first micro-inverter module 14, and when the fourth switch K4 is on and the second switch K2 is on, it obtains the port voltage V2 corresponding to the second micro-inverter module 15. Then, based on V1 and V2, the gateway controller 13 determines whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal 112.

[0047] In some embodiments, the above two-phase control states include: two independent connection states formed by sequentially and individually turning on the second switch K2 and the third switch K3, provided that the fourth switch K4 is turned on.

[0048] Among them, the above Figure 1 When the fourth switch K4 is on and the second switch K2 is on, the gateway controller 13 obtains the port voltage V2 corresponding to the second micro-inverter module 15, and when the fourth switch K4 is on and the third switch K3 is on, it obtains the port voltage V3 corresponding to the third micro-inverter module 16. Then, based on V2 and V3, the gateway controller 13 determines whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal 112.

[0049] In some embodiments, the above two-phase control states include: two independent connection states formed by sequentially and individually turning on the first switch K1 and the third switch K3, provided that the fourth switch K4 is turned on.

[0050] Among them, the above Figure 1 When the fourth switch K4 is on and the first switch K1 is on, the gateway controller 13 obtains the port voltage V1 corresponding to the first micro-inverter module 14, and when the fourth switch K4 is on and the third switch K3 is on, it obtains the port voltage V3 corresponding to the third micro-inverter module 16. Then, based on V1 and V3, the gateway controller 13 determines whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal 112.

[0051] In the above system, the phase sequence information corresponding to each micro-inverter module refers to the preset phase assignment relationship of each micro-inverter module in the power grid, that is, specifying the specific live wire (L1, L2, L3) and neutral wire (N) in the three-phase power grid that each micro-inverter module should connect to. For example: the phase sequence information of the first micro-inverter module 14 is that the live wire corresponds to L1 and the neutral wire corresponds to N; the phase sequence information of the second micro-inverter module 15 is that the live wire corresponds to L2 and the neutral wire corresponds to N; the phase sequence information of the third micro-inverter module 16 is that the live wire corresponds to L3 and the neutral wire corresponds to N.

[0052] The phase sequence information corresponding to each of the aforementioned micro-inverter modules serves to provide a judgment benchmark for the gateway controller. Specifically, when the switch control module 12 is turned on in a specific sequence, the gateway controller obtains the port voltage of the micro-inverter module corresponding to the two-phase control state based on the phase sequence information. By comparing the actual voltage with the expected voltage characteristics in the phase sequence information, the system can determine whether there is a fault of reverse connection between the neutral and live wires at the second terminal.

[0053] The aforementioned three-phase wiring detection system, because the gateway controller is wirelessly connected to each micro-inverter module and controls each phase independently, allows the gateway controller to obtain the port voltage of the corresponding micro-inverter module in two independent connection states. Through these port voltages, the neutral and live wire reverse connection faults can be accurately identified. Compared with traditional detection methods, this solution uses wireless communication to realize wiring detection, eliminating the need for manual data acquisition and manual inspection and judgment, which can improve the detection efficiency and accuracy of live and neutral wire reverse connection faults.

[0054] The aforementioned three-phase wiring detection system utilizes the wireless connection between the gateway controller and each micro-reverse module in the system, eliminating the need for complex wiring during wiring detection, simplifying the installation and debugging process, and making data acquisition more convenient. Furthermore, based on this system, the detection process can be achieved without any additional components, wiring, or measuring instruments, thus improving the convenience of detecting live and neutral wire reverse connection faults and reducing costs.

[0055] It should be noted that the specific method of connecting the first terminal of the switch control module 12 to the second terminal 112 is not limited in the embodiments of this application. Figure 1 The connection method shown is an example. In this example, when the second terminal 112 is connected to the switch control module 12, the ports corresponding to L3 and N on the second terminal 112 are reversed.

[0056] In some embodiments, the above Figure 1 The first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 shown can be mechanical switches.

[0057] In some embodiments, the above Figure 1 The first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 shown can be relays. Using relays as switches can significantly improve the control performance and reliability of the system.

[0058] In some embodiments, each micro-inverter module includes multiple micro-inverters connected in parallel, and the gateway controller is connected to the three-phase power grid and wirelessly connected to each micro-inverter.

[0059] For example, Figure 2 This is a schematic diagram of multiple micro-inverters connected in a micro-inverter module. Figure 2 In this context, W1, W2, ..., Wn represent n micro-inverters connected in parallel. Figure 2 In this context, L represents the live wire terminal of any phase, and N represents the neutral wire terminal of any phase.

[0060] In the above Figure 1 In the system shown, if each micro-inverter module includes multiple parallel micro-inverters, then the gateway controller 13 is used to obtain the port voltage of each micro-inverter in the corresponding micro-inverter module under two-phase control state.

[0061] In some embodiments, the gateway controller communicates with the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module via a wireless connection, so that the gateway controller can obtain the port voltage from the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module.

[0062] In some embodiments, the gateway controller is provided with a first wireless communication module, and each micro-inverter in the two micro-inverter modules corresponding to the two-phase control state is provided with a second wireless communication module; the gateway controller is used to send a first query message to the second wireless communication module through the first wireless communication module, the first query message being used to query the port voltage of the micro-inverter; and to receive a response message from the first query message sent by the second wireless communication module, the response message including the port voltage of the micro-inverter.

[0063] For example, Figure 3 This is a schematic diagram illustrating wireless communication interaction between a gateway controller 13 and a first micro-inverter module 14. Figure 3 As shown, the gateway controller 13 is equipped with a first wireless communication module 131, and the first micro-inverter module 14 is equipped with a second wireless communication module 141.

[0064] The first wireless communication module 131 can send a first wireless signal to the second wireless communication module 141 to inquire about the port voltage. The second wireless communication module 141 can send a second wireless signal to the first wireless communication module 131 to reply to the first wireless communication module 131. The second wireless signal can carry the port voltage V1 of the first micro-inverter module 14. The gateway controller 13 may also include a central processing unit 132, which can receive the port voltage V1 of the first micro-inverter module 14 sent to it by the first wireless communication module 131, and then, based on V1, combine it with V2 or V3 to determine the subsequent neutral and live wire reverse connection fault.

[0065] It should be noted that the wireless communication interaction between the gateway controller 13 and the second micro-inverter module 15 and the third micro-inverter module 16 is similar to the wireless communication interaction between the gateway controller 13 and the first micro-inverter module 14, as described above, and will not be repeated here.

[0066] The aforementioned wireless communication methods may include, but are not limited to, Wi-Fi communication and Bluetooth communication.

[0067] In the above embodiments, wireless communication is used, eliminating the need for complex wiring and simplifying the installation and debugging process.

[0068] In this embodiment of the application, the process of determining whether there is a reverse connection fault between the neutral and live wires at the second terminal based on the port voltage includes multiple judgment scenarios, which are described below:

[0069] In some embodiments, Figure 1 The gateway controller 13 is used to determine that there is no reverse connection fault between the neutral and live wires at the second terminal 112 when the port voltages of the two micro-inverter modules corresponding to the two independent connection states are both equal to the preset voltage; and to determine that there is a reverse connection fault between the neutral and live wires at the second terminal 112 when the port voltage of at least one of the two micro-inverter modules is not equal to the preset voltage.

[0070] For example, if the two micro-reverse modules corresponding to the two independent connection states are the first micro-reverse module 14 and the second micro-reverse module 15, then when V1=V2=220V, it is determined that there is no fault of reverse connection between the neutral wire and the live wire at the second terminal 112; if at least one of V1 and V2 is not equal to 220V, it is determined that there is a fault of reverse connection between the neutral wire and the live wire at the second terminal 112.

[0071] For example, if the two micro-reverse modules corresponding to the two independent connection states are the second micro-reverse module 15 and the third micro-reverse module 16, then when V3=V2=220V, it is determined that there is no fault of reverse connection between the neutral wire and the live wire at the second terminal 112; if at least one of V3 and V2 is not equal to 220V, it is determined that there is a fault of reverse connection between the neutral wire and the live wire at the second terminal 112.

[0072] For example, if the two micro-reverse modules corresponding to the two independent connection states are the third micro-reverse module 16 and the first micro-reverse module 14, then when V3=V1=220V, it is determined that there is no fault of reverse connection between the neutral wire and the live wire at the second terminal 112; if at least one of V3 and V1 is not equal to 220V, it is determined that there is a fault of reverse connection between the neutral wire and the live wire at the second terminal 112.

[0073] For example, if the two micro-inverter modules corresponding to the two independent connection states are the first micro-inverter module 14 and the second micro-inverter module 15, then at least one of V1 and V2 is not equal to 220V, including any of the following cases:

[0074] (1) V1 = V2 = 0;

[0075] (2) V2 = 220V, V1 = 0;

[0076] (3) V1=220V, V2=0.

[0077] In some embodiments, Figure 1 The gateway controller 13 is used to determine that there is a reverse connection fault in the two ports of the second terminal 112 that are respectively connected to the live wire terminal and the neutral wire terminal of the first target micro-inverter module when the port voltages of the two micro-inverter modules corresponding to the two independent connection states are not equal to the preset voltage.

[0078] Among them, the first target micro-inverse module is one of the micro-inverse modules other than the first micro-inverse module, the second micro-inverse module, and the third micro-inverse module.

[0079] In some embodiments, the two micro-inverter modules corresponding to the two independent connection states are the first micro-inverter module and the second micro-inverter module, and the first target micro-inverter module is the third micro-inverter module.

[0080] For example, in the above situation (1) when V1 = V2 = 0, it can be determined that there is a reverse connection fault in the two ports of the second terminal 112 that are respectively connected to the live wire terminal L3 and the neutral wire terminal N of the third micro-inverter module 16, that is... Figure 1 The C and D ports of the second terminal 112 in the circuit have a reverse connection fault.

[0081] In some embodiments, the two micro-inverse modules corresponding to the two independent connection states are the second micro-inverse module and the third micro-inverse module, and the first target micro-inverse module is the first micro-inverse module.

[0082] For example, when V3=V2=0, it can be determined that there is a reverse connection fault in the two ports of the second terminal 112 that are respectively connected to the live wire terminal L1 and the neutral wire terminal N of the first micro-inverter module 14, that is... Figure 1 The A and D ports of the second terminal 112 in the circuit have a reverse connection fault.

[0083] In some embodiments, the two micro-inverse modules corresponding to the two independent connection states are the first micro-inverse module and the third micro-inverse module, and the first target micro-inverse module is the second micro-inverse module.

[0084] For example, when V3=V1=0, it can be determined that there is a reverse connection fault in the two ports of the second terminal 112 that are respectively connected to the live wire terminal L2 and the neutral wire terminal N of the second micro-inverter module 15, that is... Figure 1 The B and D ports of the second terminal 112 in the circuit have a reverse connection fault.

[0085] In some embodiments, Figure 1 The gateway controller 13 is used to determine that there is a reverse connection fault in the two ports of the second terminal connected to the live wire and the neutral wire of the third target micro-inverter module respectively when the port voltage of the second target micro-inverter module is not equal to the preset voltage.

[0086] The third target micro-inverse module is one of the two micro-inverse modules, excluding the second target micro-inverse module.

[0087] In some embodiments, the two micro-inverse modules corresponding to the two independent connection states are the first micro-inverse module and the second micro-inverse module, wherein the second target micro-inverse module is the first micro-inverse module and the third target micro-inverse module is the second micro-inverse module, or the second target micro-inverse module is the second micro-inverse module and the third target micro-inverse module is the first micro-inverse module.

[0088] For example, in the above situation (2) when V2=220V and V1=0, it can be determined that there is a reverse connection fault in the two ports of the second terminal 112 that are respectively connected to the live wire terminal L2 and the neutral wire terminal N of the second micro-inverter module 15, that is... Figure 1The B and D ports of the second terminal 112 in the above case (3) V1=220V, V2=0, it can be determined that the two ports of the second terminal 112 that are respectively connected to the live wire L1 and the neutral wire N of the first micro inverter module 14 have reverse connection faults, that is Figure 1 The A and D ports of the second terminal 112 in the circuit have a reverse connection fault.

[0089] In some embodiments, the two micro-inverse modules corresponding to the two independent connection states are a first micro-inverse module and a third micro-inverse module, wherein the second target micro-inverse module is the first micro-inverse module and the third target micro-inverse module is the third micro-inverse module, or the second target micro-inverse module is the third micro-inverse module and the third target micro-inverse module is the first micro-inverse module.

[0090] For example, when V3=220V and V1=0, it can be determined that there is a reverse connection fault at the two ports of the second terminal 112 that are respectively connected to the live wire terminal L3 and the neutral wire terminal N of the third micro-inverter module 16, i.e. Figure 1 There is a reverse connection fault at ports C and D of the second terminal 112; when V1=220V and V3=0, it can be determined that there is a reverse connection fault at the two ports of the second terminal 112 that are respectively connected to the live wire L1 and the neutral wire N of the first micro inverter module 14, i.e. Figure 1 The A and D ports of the second terminal 112 in the circuit have a reverse connection fault.

[0091] In some embodiments, the two micro-inverse modules corresponding to the two independent connection states are a second micro-inverse module and a third micro-inverse module, wherein the second target micro-inverse module is the second micro-inverse module and the third target micro-inverse module is the third micro-inverse module, or the second target micro-inverse module is the third micro-inverse module and the third target micro-inverse module is the second micro-inverse module.

[0092] For example, when V3=220V and V2=0, it can be determined that there is a reverse connection fault on the two ports of the second terminal 112 that are respectively connected to the live wire terminal L3 and the neutral wire terminal N of the third micro-inverter module 16, that is... Figure 1 There is a reverse connection fault at ports C and D of the second terminal 112; when V2=220V and V3=0, it can be determined that there is a reverse connection fault at the two ports of the second terminal 112 that are respectively connected to the live wire L2 and the neutral wire N of the second micro inverter module 15, i.e. Figure 1 The B and D ports of the second terminal 112 in the circuit have a reverse connection fault.

[0093] It should be noted that in this embodiment, the gateway controller 13 has an automatic detection function, which can automatically detect whether the L1, L2, L3 and N in the three-phase power grid are correctly wired. Once a reverse connection is detected, an alarm will be automatically triggered. For example, when a reverse connection between L1 and N is detected, a reminder message can be sent to the application installed on the terminal. This reminder message may include a prompt about the reverse connection between L1 and N to remind the installer of the reverse connection.

[0094] In the above embodiments, logical judgment based on a preset voltage and the establishment of clear fault judgment criteria can improve the reliability of the detection results.

[0095] In some embodiments, there is a communication connection between the gateway controller and the switch control module; the gateway controller is used to control two independent connection states of the switch control module through the communication connection, and to obtain the port voltage of the corresponding micro-inverter module in each independent connection state. Figure 1 The diagram shows the communication connection between the gateway controller and the switch control module.

[0096] In some embodiments, there may be a situation where the gateway controller and the switch control module do not have a communication connection. The switch control module can achieve the above two independent connection states under the control of personnel or other equipment. The gateway controller can obtain the port voltage of the corresponding micro-inverter module in the two independent connection states respectively.

[0097] For scenarios where the gateway controller and the switch control module communicate, they can communicate via RS-485. RS-485 is a serial communication standard widely used in industrial control and long-distance communication.

[0098] For example, in the above Figure 1 and Figure 3 On this basis, Figure 4 This diagram illustrates the communication interaction between a gateway controller 13 and a switch control module 12. The gateway controller 13 is equipped with a first RS-485 communication unit 133, and the switch control module 12 is equipped with a second RS-485 communication unit 121. The gateway controller 13 is used to send control commands to the second RS-485 communication unit 121 via the first RS-485 communication unit 121 to control the two independent connection states of the switch control module 12. Both the first RS-485 communication unit 133 and the second RS-485 communication unit 121 are units that support RS-485.

[0099] In the above embodiments, the RS-485 communication protocol is used to achieve precise control command transmission, ensuring the real-time performance and stability of switch state switching.

[0100] For example, in Figure 4On this basis, Figure 5 This is a schematic diagram of the structure of a switch control module 12. Figure 5 As shown, the switch control module 12 may include: the aforementioned first switch K1, second switch K2, third switch K3, and fourth switch K4, the aforementioned second 485 communication unit 121, and a switch control circuit 122. It should be noted that when K1, K2, K3, and K4 in the figure are relays, the switch control circuit 122 is a relay control circuit. The second 485 communication unit 121 can receive... Figure 4 The gateway controller 13 shown sends control commands to the switch control circuit 122, so that the switch control circuit can output control signals to control the conduction or disconnection of K1, K2, K3 and K4.

[0101] The aforementioned control command is used to instruct that K4 be turned on first, and then, with K4 turned on, to sequentially and individually turn on any two of K1, K2, and K3.

[0102] In the above embodiments, the gateway controller is communicatively connected to the switch control module, and controls the switch control module to sequentially and individually connect any two live wire terminals under specific conditions and obtain the corresponding phase micro-inverter module port voltage, thereby realizing the control of the switch control module and the process of obtaining the port voltage.

[0103] In some embodiments, the gateway controller is provided with a Bluetooth communication unit and / or a wireless local area network (Wi-Fi) communication unit; the gateway controller is used to receive detection instructions sent by the terminal through the Bluetooth communication unit and / or the Wi-Fi communication unit, the detection instructions being used to indicate whether there is a fault of reverse connection between the neutral wire and the live wire.

[0104] For example, in Figure 4 On this basis, Figure 6 This is a schematic diagram of the structure of a gateway controller 13. Figure 6 The gateway controller 13 is equipped with a Bluetooth communication unit 134. The gateway controller 13 receives detection commands sent by the terminal via the Bluetooth communication unit 134. These detection commands indicate whether a reverse connection fault exists between the neutral and live wires. The terminal itself has Bluetooth communication functionality. It should be noted that... Figure 6 This example uses a gateway controller 13 equipped with a Bluetooth communication unit 134. In practical applications, this... Figure 6 The Bluetooth communication unit 134 can also be replaced with a Wi-Fi communication unit.

[0105] Users can trigger a detection of whether the neutral and live wires are reversed through a simple operation in an application installed on the terminal, and send the above detection command to the gateway controller using Bluetooth and / or Wi-Fi communication functions.

[0106] In some embodiments, Figure 6 After receiving the detection command sent by the terminal via the Bluetooth communication unit 134, the gateway controller 13 can transmit the detection command to the central processing unit 132. The central processing unit 132 can then generate the control command based on the detection command and send the control command to the second 485 communication unit 121 in the switch control module 12 via the first 485 communication unit 133 of the gateway controller 13. This allows the switch control module 12 to control each switch to achieve two independent connection states. Furthermore, the central processing unit 132 can generate a wireless signal to query the port voltage based on the detection command and send it to each micro-inverter module via the first wireless communication module 131 to obtain the port voltage of the corresponding micro-inverter module under the two independent connection states.

[0107] In the above embodiments, when the gateway controller integrates a Bluetooth communication unit, it can support triggering detection within the near-field communication range of the Bluetooth communication unit. When the gateway controller integrates a Wi-Fi communication unit, it can support remote triggering detection within the communication range of the Wi-Fi communication unit, thereby enhancing the system's operational convenience and human-computer interaction capabilities.

[0108] In some embodiments, the gateway controller is further configured to receive phase sequence information corresponding to each micro-inverter module sent by the terminal via a Bluetooth communication unit and / or a Wi-Fi communication function. The terminal obtains the phase sequence information corresponding to each micro-inverter module in any of the following ways: scanning the code corresponding to the phase sequence information, NFC communication, or receiving user-entered information.

[0109] In some embodiments, exemplary, Figure 6 The gateway controller 13 is also used to receive phase sequence information corresponding to each micro-inverter module sent by the terminal via the Bluetooth communication unit 134.

[0110] For example, regarding the above method of scanning phase sequence information, each micro inverter can be equipped with a QR code or barcode (such as affixed to the surface of the device). The terminal can automatically parse the corresponding phase sequence information after scanning the code with a camera.

[0111] For example, with respect to the above-mentioned NFC communication method, each micro inverter can have an NFC tag built in. When the terminal is close, it can directly read the phase sequence information pre-stored in the tag through the NFC function without physical contact or manual input.

[0112] For example, regarding the above-mentioned method of receiving user-entered information, the terminal can provide an interactive interface (such as a mobile application) that allows users to manually input or select the phase sequence information corresponding to each micro-inverter module.

[0113] In the above embodiments, flexible interaction with the terminal is achieved via Bluetooth and / or Wi-Fi communication, eliminating the need for maintenance personnel to operate the equipment near the device or on-site, thus improving operational convenience and human-machine interaction capabilities. Furthermore, it supports multiple methods such as scanning codes, NFC sensing, and manual input to obtain the phase sequence information of the micro-inverter module and wirelessly transmit it to the gateway controller. This eliminates the limitations of traditional reliance on manual verification or fixed presets, simplifies the data configuration process, reduces the risk of human error, and significantly improves system deployment efficiency and adaptability.

[0114] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0115] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A three-phase wiring detection system, characterized in that, include: Combiner module, switch control module, gateway controller, corresponding to the first micro-inverter module, second micro-inverter module and third micro-inverter module of the three phases; The bus module includes a first terminal and a second terminal. The first port, the second port and the third port of the first terminal are respectively connected to the live wire of the first micro-inverter module, the live wire of the second micro-inverter module and the live wire of the third micro-inverter module. The fourth port of the first terminal is connected to the neutral wire of each micro-inverter module. The four ports of the second terminal are respectively connected to the four ports of the first terminal. The first terminal of the switch control module is connected to the second terminal, and the second terminal of the switch control module is connected to the three-phase power grid. The switch control module includes a first switch, a second switch, a third switch, and a fourth switch that are respectively connected to the live wire and the neutral wire of the three-phase power grid. The gateway controller is connected to the three-phase power grid and wirelessly connected to each micro-inverter module. It is used to obtain the port voltage of the corresponding micro-inverter module under two-phase control state through wireless connection according to the phase sequence information of each micro-inverter module, and determine whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal based on the port voltage. The two-phase control states include two independent connection states formed by sequentially and individually turning on any two of the first, second, and third switches, provided that the fourth switch is turned on.

2. The system according to claim 1, characterized in that, Each of the micro-inverter modules includes multiple micro-inverters connected in parallel, and the gateway controller is connected to the three-phase power grid and wirelessly connected to each of the micro-inverters. The gateway controller is used to acquire the port voltage of each micro-inverter in the corresponding micro-inverter module under two-phase control state.

3. The system according to claim 2, characterized in that, The gateway controller is equipped with a first wireless communication module, and each of the micro-inverters in the two micro-inverter modules corresponding to the two-phase control state is equipped with a second wireless communication module. The gateway controller is configured to send a first query message to the second wireless communication module via the first wireless communication module, the first query message being used to query the port voltage of the microinverter; and to receive a response message from the second wireless communication module for the first query message, the response message including the port voltage of the microinverter.

4. The system according to claim 3, characterized in that, The gateway controller is configured to determine that there is no reverse connection fault between the neutral and live wires at the second terminal when the port voltages of both micro-inverter modules are equal to the preset voltage; and to determine that there is a reverse connection fault between the neutral and live wires at the second terminal when the port voltage of at least one of the two micro-inverter modules is not equal to the preset voltage.

5. The system according to claim 4, characterized in that, The gateway controller is used to determine that there is a reverse connection fault in the two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the first target micro-inverter module when the port voltages of the two micro-inverter modules are not equal to the preset voltage; The first target micro-inverter module is one of the micro-inverter modules other than the first, second, and third micro-inverter modules.

6. The system according to claim 4, characterized in that, The gateway controller is used to determine that there is a reverse connection fault in the two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the third target micro-inverter module when the port voltage of the second target micro-inverter module is not equal to the preset voltage. The third target micro-inverter module is one of the two micro-inverter modules other than the second target micro-inverter module.

7. The system according to claim 4, characterized in that, The preset voltage includes 220V or 110V, and the case where it is not equal to the preset voltage refers to the port voltage being 0.

8. The system according to claim 1, characterized in that, The first switch, the second switch, the third switch, and the fourth switch are relays.

9. The system according to claim 1, characterized in that, The gateway controller is communicatively connected to the switch control module; The gateway controller is used to control the two independent connection states of the switch control module through a communication connection, and to obtain the port voltage of the corresponding micro-inverter module in each independent connection state.

10. The system according to claim 9, characterized in that, The gateway controller is provided with a first 485 communication unit, and the switch control module is provided with a second 485 communication unit; The gateway controller is used to send control commands to the second 485 communication unit through the first 485 communication unit to control the two independent connection states of the switch control module.

11. The system according to any one of claims 2 to 10, characterized in that, The gateway controller is equipped with a Bluetooth communication unit and / or a Wi-Fi communication unit; The gateway controller is configured to receive a detection command sent by the terminal via the Bluetooth communication unit and / or the Wi-Fi communication unit. The detection command is used to indicate whether there is a fault of reverse connection between the neutral wire and the live wire.

12. The system according to claim 11, characterized in that, The gateway controller is also configured to receive phase sequence information corresponding to each micro-inverter module sent by the terminal through the Bluetooth communication unit and / or the Wi-Fi communication unit; The terminal obtains the phase sequence information corresponding to each micro-inverter module in one of the following ways: Scan the code corresponding to the phase sequence information, perform NFC communication, and receive user-entered information.

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