Three-phase wiring detection system

Abstract

The utility model relates to a three-phase wiring detection system. Comprising a first terminal and a second terminal, a first port, a second port and a third port of the first terminal are correspondingly connected with live wire ends of a first micro-inverse module, a second micro-inverse module and a third micro-inverse module respectively, and a fourth port of the first terminal is connected with zero wire ends of the micro-inverse modules; the four ports of the second wiring terminal are correspondingly connected with the four ports of the first wiring 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 communication connection with each micro-inverse module, and is used for obtaining the port voltage of the corresponding micro-inverse module in a three-phase control state. And based on the port voltage, whether the second wiring terminal has a reverse connection fault of the zero line and the live line is determined, and 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, comprising:

[0005] The converter module, switch control module, gateway controller, and corresponding three-phase first micro-inverter module, second micro-inverter module and third micro-inverter module;

[0006] 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.

[0007] 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.

[0008] The gateway controller is connected to the three-phase power grid and communicates with each of the micro-inverter modules. It is used to obtain the port voltage of the corresponding micro-inverter module in the three-phase control state. 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 three-phase control state includes three independent connection states formed by sequentially turning on the first switch, the second switch and the third switch, provided that the fourth switch is turned on.

[0009] In some embodiments, the gateway controller is provided with a first PLC communication unit, and the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module are provided with a second PLC communication unit;

[0010] The gateway controller is used to exchange PLC signals with the second PLC communication unit in the corresponding micro-inverter module through the first PLC communication unit in the three-phase control state to obtain the port voltage.

[0011] 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 the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module are all 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 there is a case where the port voltages of the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module are not equal to the preset voltage.

[0012] In some embodiments, the gateway controller is configured to determine that there is a reverse connection fault in two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the first micro-inverter module when the port voltage of the first micro-inverter module is a preset voltage and the port voltages of the second micro-inverter module and the third micro-inverter module are not the preset voltage.

[0013] In some embodiments, the gateway controller is configured to determine that there is a reverse connection fault in two ports of the second terminal block that are respectively connected to the live wire and the neutral wire of the second micro-inverter module when the port voltage of the second micro-inverter module is a preset voltage and the port voltages of the first micro-inverter module and the third micro-inverter module are not the preset voltage.

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

[0015] In some embodiments, the preset voltage includes 220V or 110V, and the case where it is not equal to the preset voltage means that the port voltage is 0.

[0016] In some embodiments, the first switch, the second switch, the third switch, and the fourth switch are relays.

[0017] In some embodiments, the gateway controller is communicatively connected to the switch control module;

[0018] The gateway controller is used to control the three 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.

[0019] 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;

[0020] The gateway controller is used to send control commands to the second 485 communication unit through the first 485 communication unit to control the three independent connection states of the switch control module.

[0021] In some embodiments, the gateway controller is provided with a Bluetooth communication unit and / or a Wi-Fi communication unit;

[0022] 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.

[0023] In some embodiments, each of the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module includes: a plurality of micro-inverters connected in parallel.

[0024] In some embodiments, each of the microinverters includes a capacitor;

[0025] One end of the capacitor is connected to the live wire of the micro-inverter module where the micro-inverter is located, and the other end of the capacitor is connected to the neutral wire of the micro-inverter module where the micro-inverter is located. The capacitor and the gateway controller form a loop for PLC communication.

[0026] The aforementioned three-phase wiring detection system includes: a busbar 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; The combiner 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 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 respectively connected to the live wire and neutral wire of the three-phase power grid. The gateway controller is connected to the three-phase power grid and communicates with each micro-inverter module. It is used to obtain the port voltage of the corresponding micro-inverter module under three-phase control conditions. Based on the port voltage, it determines whether there is a reverse connection fault between the neutral and live wires at the second terminal. The three-phase control conditions include three independent connection states formed by sequentially and individually turning on the first, second, and third switches when the fourth switch is turned on. This solution allows the gateway controller to communicate with each micro-inverter module, enabling it to acquire the port voltage of each phase micro-inverter module under three independent connection states. These port voltages can accurately identify neutral-live wire reverse connection faults. Compared to traditional detection methods, this solution utilizes the communication path within the system (the gateway controller communicates with each micro-inverter module) to perform wiring detection, eliminating the need for manual data acquisition and manual inspection and judgment. This improves the detection efficiency and accuracy of live-neutral wire reverse connection faults.

[0027] The aforementioned three-phase wiring detection system utilizes the communication path within the system (the gateway controller communicates with each micro-reverse module), making data acquisition during wiring detection more convenient. Furthermore, based on this system, the detection process can be achieved without additional components, wiring, or measuring instruments, thus improving the ease of detecting live and neutral wire reverse connection faults and reducing costs.

[0028] In the above three-phase wiring detection system, the PLC communication circuit is constructed by using the capacitive reactance characteristics of the capacitor in the micro-inverter. Even in the event of a reverse connection fault between the live and neutral wires, the capacitor can still maintain a high-frequency signal path, ensuring uninterrupted communication between the gateway controller and the micro-inverter module. By reusing the capacitor as a communication medium, wiring can be simplified without adding extra lines and devices, thus reducing the implementation cost of the solution. Attached Figure Description

[0029] 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.

[0030] Figure 1 A schematic diagram of a three-phase wiring detection system provided in this application embodiment;

[0031] Figure 2 This is a schematic diagram of PLC signal interaction between a gateway controller 13 and a first micro-inverter module 14;

[0032] Figure 3 This is a schematic diagram showing the connection of multiple micro-inverters in a micro-inverter module.

[0033] Figure 4 This is a schematic diagram of PLC signal flow;

[0034] Figure 5 This is a schematic diagram of communication and interaction between a gateway controller 13 and a switch control module 12;

[0035] Figure 6 This is a schematic diagram of the structure of a switch control module 12;

[0036] Figure 7 This is a schematic diagram of the structure of a gateway controller 13. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The gateway controller 13 is connected to the three-phase power grid and communicates with each micro-inverter module. It is used to obtain the port voltage of the corresponding micro-inverter module under three-phase control state. 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 112.

[0042] 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.

[0043] The three-phase control states include three independent connection states formed by sequentially and individually turning on the first switch K1, the second switch K2, and the third switch K3, provided that the fourth switch K4 is turned on.

[0044] The above three-phase control states include:

[0045] First phase state: Fourth switch K4 is on, first switch K1 is on, second switch K2 and third switch K3 are off;

[0046] Second phase state: Fourth switch K4 is on, second switch K2 is on, first switch K1 and third switch K3 are off;

[0047] Third phase state: Fourth switch K4 is on, third switch K3 is on, first switch K2 and second switch K2 are off.

[0048] In the first phase state, the gateway controller 13 acquires the port voltage V1 corresponding to the first micro-inverter module 14; in the second phase state, it acquires the port voltage V2 corresponding to the second micro-inverter module 15; and in the third phase state, it acquires the port voltage V3 corresponding to the third micro-inverter module 16. Then, based on V1, V2, and V3, the gateway controller 13 determines whether there is a reverse connection fault between the neutral and live wires at the second terminal 112.

[0049] The above scheme employs a phase-independent detection mechanism. While maintaining the neutral wire switch (K4) continuously conducting, it sequentially and independently activates the live wire switches (K1, K2, K3) in three independent connection states. This allows the gateway controller to acquire the port voltage of each phase's micro-inverter module under these three independent connection conditions. These port voltages enable accurate identification of neutral-live wire reverse connection faults. Compared to traditional detection methods, this scheme utilizes the system's communication path (communication connection between the gateway controller and each micro-inverter module) for wiring detection, eliminating the need for manual data acquisition and judgment, thus improving the efficiency and accuracy of live-neutral wire reverse connection fault detection. Furthermore, the use of the system's communication path (communication connection between the gateway controller and each micro-inverter module) makes data acquisition during wiring detection more convenient. Based on this system, the detection process can be achieved without additional components, wiring, or measuring instruments, thereby improving the convenience of live-neutral wire reverse connection fault detection and reducing costs.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In some embodiments, the gateway controller interacts with the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module via power line communication (PLC) so that the gateway controller can obtain port voltages from the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module.

[0054] In some embodiments, the gateway controller is provided with a first PLC communication unit, and the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module are provided with second PLC communication units; the gateway controller is used to exchange PLC signals with the second PLC communication units in the corresponding micro-inverter modules through the first PLC communication unit in a three-phase control state to obtain the port voltage.

[0055] For example, Figure 2 This is a schematic diagram illustrating the PLC signal interaction between a gateway controller 13 and a first micro-inverter module 14. Figure 2 As shown, the gateway controller 13 is equipped with a first PLC communication unit 131, and the first micro-inverter module 14 is equipped with a second PLC communication unit 141.

[0056] The first PLC communication unit 131 can send a first PLC signal to the second PLC communication unit 141 to inquire about the port voltage. The second PLC communication unit 141 can send a second PLC signal to the first PLC communication unit 131 to reply to the first PLC signal. The second PLC 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 PLC communication unit 131, and then use V1 in combination with V2 and V3 to determine the subsequent neutral and live wire reverse connection fault.

[0057] It should be noted that the PLC signal interaction between the gateway controller 13 and the second micro-inverter module 15 and the third micro-inverter module 16 is similar to the PLC signal interaction between the gateway controller 13 and the first micro-inverter module 14, as described above, and will not be repeated here.

[0058] In the above embodiments, PLC communication is used to realize real-time interaction of voltage data, and fault detection can be completed without additional wiring, reducing system complexity.

[0059] In some embodiments, each of the first, second, and third micro-inverter modules includes a plurality of micro-inverters connected in parallel. Each micro-inverter includes a capacitor, one end of which is connected to the live wire of the micro-inverter module containing the micro-inverter, and the other end of which is connected to the neutral wire of the same module. The capacitor and the gateway controller form a loop for PLC communication.

[0060] For example, Figure 3 This is a schematic diagram of multiple micro-inverters connected in a micro-inverter module. Figure 3 In this context, W1, W2, ..., Wn represent n micro-inverters connected in parallel. Figure 3 In this context, C1, C2, ..., Cn represent capacitors. Figure 3 In this context, L represents the live wire terminal of any phase, and N represents the neutral wire terminal of any phase.

[0061] In the above embodiments, the micro-inverter module supports the parallel expansion of multiple micro-inverters, improving system capacity adaptability and deployment flexibility.

[0062] For example, in Figure 1 On this basis, Figure 4 This is a schematic diagram of PLC signal flow. (Example) Figure 4 The dashed arrows shown illustrate the PLC signal flow when the live and neutral wires are incorrectly connected, and both the first switch K1 and the fourth switch K4 are on. It is understandable that... Figure 4 Only one capacitor is shown in the first microinverter module 14, the second microinverter module 15, and the third microinverter module 16. In practice, each microinverter in the microinverter module includes one capacitor. Figure 4 This is merely an illustrative example.

[0063] In the above embodiments, the PLC communication circuit is constructed by utilizing the capacitive reactance characteristics of the capacitors in the micro-inverter. Even in the event of a reverse connection fault between the live and neutral wires, the capacitors can still maintain a high-frequency signal path, ensuring uninterrupted communication between the gateway controller and the micro-inverter module. By reusing the capacitors as a communication medium, wiring can be simplified without adding extra lines and devices, thus reducing the implementation cost of the solution.

[0064] In this embodiment of the application, the process of determining whether there is a reverse connection fault between the neutral wire and the live wire at the second terminal 112 based on the port voltage includes multiple judgment scenarios, which are described below:

[0065] In some embodiments, Figure 1 The gateway controller 13 is used to determine that there is no fault of reverse connection between neutral and live wire in the second terminal 112 when the port voltages of the first micro-inverter module 14, the second micro-inverter module 15 and the third micro-inverter module 16 are all equal to the preset voltage; and to determine that there is a fault of reverse connection between neutral and live wire in the second terminal 112 when there is a situation where the port voltages of the first micro-inverter module 14, the second micro-inverter module 15 and the third micro-inverter module 16 are not equal to the preset voltage.

[0066] In some embodiments, the preset voltage includes 220V or 110V. The case where the voltage is not equal to the preset voltage refers to a port voltage of 0.

[0067] For example, if V1=V2=V3=220V, then it is determined that there is no fault of reverse connection between neutral and live wires at the second terminal 112; if at least one of V1, V2 and V3 is not equal to 220V, then it is determined that there is a fault of reverse connection between neutral and live wires at the second terminal 112.

[0068] Where at least one of V1, V2, and V3 is not equal to 220V, including any of the following cases:

[0069] (1) V1 = 220V, V2 = V3 = 0;

[0070] (2) V2 = 220V, V3 = V1 = 0;

[0071] (3) V3=220V, V1=V2=0.

[0072] 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 L1 and the neutral wire terminal N of the first micro-inverter module 14 when the port voltage V1 of the first micro-inverter module 14 is a preset voltage and the port voltage V2 of the second micro-inverter module 15 and the port voltage V3 of the third micro-inverter module 16 are not preset voltages.

[0073] For example, in the above situation (1) when V1 = 220V, V2 = V3 = 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 There is a reverse connection fault between port A and port D in the second terminal 112.

[0074] 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 L2 and the neutral wire terminal N of the second micro-inverter module 15 when the port voltage V2 of the second micro-inverter module 15 is a preset voltage and the port voltage V1 of the first micro-inverter module 14 and the port voltage V3 of the third micro-inverter module 16 are not preset voltages.

[0075] For example, in the above situation (2) when V2 = 220V, 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 There is a reverse connection fault between port B and port D in the second terminal 112.

[0076] In some embodiments, the gateway controller is configured to determine that there is a reverse connection fault in two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the third micro-inverter module when the port voltage of the third micro-inverter module is a preset voltage and the port voltages of the first micro-inverter module and the second micro-inverter module are not preset voltages.

[0077] For example, in the above situation (3) when V3=220V and 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 There is a reverse connection fault between port C and port D in the second terminal 112.

[0078] 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.

[0079] 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.

[0080] In some embodiments, there is a situation where the gateway controller and the switch control module are connected in communication; the gateway controller is used to control the three 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.

[0081] 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 three 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 each of the three independent connection states.

[0082] 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.

[0083] For example, in the above Figure 1 and Figure 2 On this basis, Figure 5 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 from the first RS-485 communication unit 121 to the second RS-485 communication unit 121 to control three 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.

[0084] 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.

[0085] For example, in Figure 5On this basis, Figure 6 This is a schematic diagram of the structure of a switch control module 12. Figure 6 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 5 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.

[0086] The aforementioned control command is used to instruct K4 to be turned on first, and then, with K4 turned on, K1, K2 and K3 to be turned on individually in sequence.

[0087] 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 each phase live wire terminal 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.

[0088] 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.

[0089] For example, in Figure 5 On this basis, Figure 7 This is a schematic diagram of the structure of a gateway controller 13. Figure 7 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 7 This example uses a gateway controller 13 equipped with a Bluetooth communication unit 134. In practical applications, this... Figure 7 The Bluetooth communication unit 134 can also be replaced with a Wi-Fi communication unit.

[0090] 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.

[0091] In some embodiments, after the gateway controller 13 receives the detection command sent by the terminal through the Bluetooth communication unit 134, it can transmit the detection command to the central processing unit 132. Then, the central processing unit 132 can generate the control command mentioned above based on the detection command, and send the control command to the second 485 communication unit 121 in the switch control module 12 through the first 485 communication unit 133 of the gateway controller 13. This allows the switch control module 12 to control each switch to achieve three independent connection states. The central processing unit 132 can also generate a PLC signal for querying the port voltage based on the detection command, and send it to each micro-inverter module through the first PLC communication unit 131 to obtain the port voltage of the corresponding micro-inverter module under the three independent connection states.

[0092] 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.

[0093] 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.

[0094] 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 communicates with each of the micro-inverter modules to obtain the port voltage of the corresponding micro-inverter module under three-phase control conditions. Based on the port voltage, determine whether there is a fault of reverse connection between the neutral wire and the live wire at the second terminal; The three-phase control states include: under the premise that the fourth switch is turned on, three independent connection states are formed by sequentially turning on the first switch, the second switch and the third switch.

2. The system according to claim 1, characterized in that, The gateway controller is equipped with a first PLC communication unit, and the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module are equipped with a second PLC communication unit; The gateway controller is used to exchange PLC signals with the second PLC communication unit in the corresponding micro-inverter module through the first PLC communication unit in the three-phase control state to obtain the port voltage.

3. The system according to claim 1, 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 the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module are all 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 any of the port voltages of the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module is not equal to the preset voltage.

4. The system according to claim 3, characterized in that, The gateway controller is configured to determine that there is a reverse connection fault in two ports of the second terminal that are respectively connected to the live wire and the neutral wire of the first micro-inverter module when the port voltage of the first micro-inverter module is a preset voltage and the port voltages of the second micro-inverter module and the third micro-inverter module are not the preset voltage.

5. The system according to claim 3, characterized in that, The gateway controller is configured to determine that there is a reverse connection fault in two ports of the second terminal block that are respectively connected to the live wire and the neutral wire of the second micro-inverter module when the port voltage of the second micro-inverter module is a preset voltage and the port voltages of the first micro-inverter module and the third micro-inverter module are not the preset voltage.

6. The system according to claim 3, characterized in that, The gateway controller is configured to determine, when the port voltage of the third micro-inverter module is a preset voltage, and the port voltages of the first micro-inverter module and the second micro-inverter module are not 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 micro-inverter module.

7. The system according to claim 3, 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 three 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 three independent connection states of the switch control module.

11. The system according to any one of claims 1 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 any one of claims 1 to 10, characterized in that, Each of the first micro-inverter module, the second micro-inverter module, and the third micro-inverter module includes: multiple micro-inverters connected in parallel.

13. The system according to claim 12, characterized in that, Each of the microinverters includes a capacitor; One end of the capacitor is connected to the live wire of the micro-inverter module where the micro-inverter is located, and the other end of the capacitor is connected to the neutral wire of the micro-inverter module where the micro-inverter is located. The capacitor and the gateway controller form a loop for PLC communication.

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