Search

CN-224231946-U - Three-phase wiring detecting system

CN224231946UCN 224231946 UCN224231946 UCN 224231946UCN-224231946-U

Abstract

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

Inventors

  • HE LONGZHAO

Assignees

  • 上海摩瓦新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20250530

Claims (12)

  1. 1. The three-phase wiring detection system is characterized by comprising a converging module, a switch control module, a gateway controller, a first micro-inversion module, a second micro-inversion module and a third micro-inversion module, wherein the first micro-inversion module, the second micro-inversion module and the third micro-inversion module correspond to three phases; The bus module comprises a first wiring terminal and a second wiring terminal, a first port, a second port and a third port of the first wiring terminal are respectively and correspondingly connected with a live wire end of the first micro-inversion module, a live wire end of the second micro-inversion module and a live wire end of the third micro-inversion module, a fourth port of the first wiring terminal is connected with a zero line end of each micro-inversion module, and four ports of the second wiring terminal are respectively and correspondingly connected with four ports of the first wiring terminal; the first end of the switch control module is connected with the second wiring end, the second end of the switch control module is connected with a three-phase power grid, and the switch control module comprises a first switch, a second switch, a third switch and a fourth switch which are respectively and correspondingly connected with a live wire and a zero wire of the three-phase power grid; The gateway controller is connected to a three-phase power grid and is in wireless connection with each micro-inversion module, and is used for acquiring port voltages of the corresponding micro-inversion modules in a two-phase control state according to phase sequence information corresponding to each micro-inversion module through wireless connection, and determining whether a zero line and a fire wire reverse connection fault exists at the second wiring terminal based on the port voltages; The two-phase control state comprises two independent connection states formed by sequentially and independently switching on any two of the first switch, the second switch and the third switch on the premise that the fourth switch is switched on.
  2. 2. The system of claim 1, wherein each of the micro-inverter modules comprises a plurality of micro-inverters connected in parallel, and the gateway controller is connected to a three-phase power grid and is wirelessly connected with each of the micro-inverters; The gateway controller is used for acquiring the port voltage of each micro inverter in the corresponding micro inverter module under the two-phase control state.
  3. 3. The system according to claim 2, wherein the gateway controller is provided with a first wireless communication module, and each of the micro-inverters in the corresponding two micro-inverter modules in the two-phase control state is provided with a second wireless communication module; The gateway controller is used for sending a first inquiry message to the second wireless communication module through the first wireless communication module, wherein the first inquiry message is used for inquiring the port voltage of the micro-inverter, and receiving a response message of the first inquiry message sent by the second wireless communication module, and the response message comprises the port voltage of the micro-inverter.
  4. 4. The system of claim 3, wherein the gateway controller is configured to determine that the second terminal has no neutral-to-live reverse connection fault when the port voltages of the two micro-inverse modules are both equal to a preset voltage, and determine that the second terminal has a neutral-to-live reverse connection fault when the port voltage of at least one of the two micro-inverse modules is not equal to the preset voltage.
  5. 5. The system of claim 4, wherein the gateway controller is configured to determine that two ports of the second terminals respectively connected to the hot line terminal and the neutral line terminal of the first target micro-inverse module have a reverse connection fault when the port voltages of the two micro-inverse modules are not equal to the preset voltage; The first target micro-inversion module is one micro-inversion module except the two micro-inversion modules in the first micro-inversion module, the second micro-inversion module and the third micro-inversion module.
  6. 6. The system of claim 4, wherein the gateway controller is configured to determine that two ports of the second terminal, which are respectively connected to the hot wire end and the neutral wire end of the third target micro-inverse module, have a reverse connection fault when the port voltage of the second target micro-inverse module is not equal to the preset voltage; The third target micro-inversion module is one micro-inversion module except the second target micro-inversion module in the two micro-inversion modules.
  7. 7. The system of claim 4, wherein the predetermined voltage comprises 220V or 110V, and the condition not equal to the predetermined voltage is that the port voltage is 0.
  8. 8. The system of claim 1, wherein the first switch, the second switch, the third switch, and the fourth switch are relays.
  9. 9. The system of claim 1, wherein the gateway controller is communicatively coupled to the switch control module; The gateway controller is used for controlling the two independent connection states of the switch control module through communication connection and respectively obtaining port voltages of the corresponding micro-inversion modules in each independent connection state.
  10. 10. The system of claim 9, wherein 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 configured to send a control instruction to the second 485 communication unit through the first 485 communication unit, so as to control the two independent connection states of the switch control module.
  11. 11. System according to any of claims 2 to 10, characterized in that the gateway controller is provided with a bluetooth communication unit and/or a Wi-Fi communication unit; The gateway controller is used for receiving a detection instruction sent by the terminal through the Bluetooth communication unit and/or the Wi-Fi communication unit, and the detection instruction is used for indicating whether a zero line and live line reverse connection fault exists or not.
  12. 12. The system of claim 11, wherein the system further comprises a controller configured to control the controller, The gateway controller is further configured to receive phase sequence information corresponding to each micro inverse module sent by the terminal through the bluetooth communication unit and/or the Wi-Fi communication unit; the mode of the terminal obtaining the phase sequence information corresponding to each micro inverse module comprises any one of the following steps: Scanning codes corresponding to the phase sequence information, NFC communication and receiving user input information.

Description

Three-phase wiring detecting system Technical Field The application relates to the technical field of installation of micro-inverters, in particular to a three-phase wiring detection system. Background The utility power transmission is usually carried out in a three-phase four-wire mode, so when the micro-inverter is installed in a three-phase system, the micro-inverter of each phase is connected into a three-phase power grid after being converged through a converging module, when the converging module is connected with the three-phase power grid, the phenomenon that a live wire and a zero wire are reversely connected can exist at a converging position, when the live wire and the zero wire are reversely connected at the converging position, the port voltage of the micro-inverter on two phases after the upper alternating current can reach 380V, and the micro-inverter can be damaged. At present, no good solution exists for wiring detection when the micro inverter is connected with a three-phase power grid through a confluence module, manual judgment is needed, and the detection mode has the problems of low detection efficiency and poor accuracy. Disclosure of utility model Based on the above, it is necessary to provide a three-phase wiring detection system, which can improve the detection efficiency and accuracy of the reverse connection fault between the zero line and the live line. In a first aspect, the application provides a three-phase wiring detection system, which comprises a converging module, a switch control module, a gateway controller, a first micro-inversion module, a second micro-inversion module and a third micro-inversion module, wherein the first micro-inversion module, the second micro-inversion module and the third micro-inversion module correspond to three phases; The bus module comprises a first wiring terminal and a second wiring terminal, a first port, a second port and a third port of the first wiring terminal are respectively and correspondingly connected with a live wire end of the first micro-inversion module, a live wire end of the second micro-inversion module and a live wire end of the third micro-inversion module, a fourth port of the first wiring terminal is connected with a zero line end of each micro-inversion module, and four ports of the second wiring terminal are respectively and correspondingly connected with four ports of the first wiring terminal; the first end of the switch control module is connected with the second wiring end, the second end of the switch control module is connected with a three-phase power grid, and the switch control module comprises a first switch, a second switch, a third switch and a fourth switch which are respectively and correspondingly connected with a live wire and a zero wire of the three-phase power grid; The gateway controller is connected to a three-phase power grid and is in wireless connection with each micro-inversion module, and is used for acquiring port voltages of the corresponding micro-inversion modules in a two-phase control state according to phase sequence information corresponding to each micro-inversion module through wireless connection, and determining whether a zero line and a fire wire reverse connection fault exists at the second wiring terminal based on the port voltages; The two-phase control state comprises two independent connection states formed by sequentially and independently switching on any two of the first switch, the second switch and the third switch on the premise that the fourth switch is switched on. In some embodiments, each micro-inverter in each micro-inverter module comprises a plurality of micro-inverters connected in parallel, and the gateway controller is connected to a three-phase power grid and is in wireless connection with each micro-inverter; The gateway controller is used for acquiring the port voltage of each micro inverter in the corresponding micro inverter module under the two-phase control state. In some embodiments, the gateway controller is provided with a first wireless communication module, and each of the micro-inverters in the two corresponding micro-inverter modules in the two-phase control state is provided with a second wireless communication module; The gateway controller is used for sending a first inquiry message to the second wireless communication module through the first wireless communication module, wherein the first inquiry message is used for inquiring the port voltage of the micro-inverter, and receiving a response message of the first inquiry message sent by the second wireless communication module, and the response message comprises the port voltage of the micro-inverter. In some embodiments, the gateway controller is configured to determine that the second terminal has no reverse connection fault between the neutral wire and the live wire when the port voltages of the two micro-inverse modules are both equal to a preset voltage, and determine that the second ter