Search

CN-224231947-U - Three-phase wiring detecting system

CN224231947UCN 224231947 UCN224231947 UCN 224231947UCN-224231947-U

Abstract

The application relates to a three-phase wiring detection system. The system comprises a confluence module, a gateway controller, a switching control module, a three-phase power grid, a gateway controller and a network 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 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 zero wire ends of all the micro-inversion modules, 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 switching control module is connected with the second wiring terminal, the second end of the switching control module is connected with the three-phase power grid and comprises four switches respectively and correspondingly connected with live wire and zero wire of the three-phase power grid, the gateway controller is connected with the three-phase power grid and is in communication connection with all the micro-inversion modules, and is used for respectively obtaining port voltages of the corresponding micro-inversion modules under a three-phase control state, and determining whether the zero wire and live wire inverse connection faults exist on the second wiring based on the port voltages.

Inventors

  • HE LONGZHAO
  • WANG CHAOHUI

Assignees

  • 上海摩瓦新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20250530

Claims (13)

  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 communication connection with each micro-inversion module, and is used for respectively obtaining port voltages of the corresponding micro-inversion modules in a three-phase control state, determining whether a zero line and a live line reverse connection fault exists at the second wiring terminal based on the port voltages, wherein the three-phase control state comprises three independent connection states formed by sequentially and independently conducting the first switch, the second switch and the third switch on the premise that the fourth switch is conducted.
  2. 2. The system of claim 1, wherein the gateway controller is provided with a first PLC communication unit, and the first, second, and third micro-inverse modules are provided with a second PLC communication unit; And the gateway controller is used for carrying out PLC signal interaction between the first PLC communication unit and the second PLC communication unit in the corresponding micro-inversion module respectively under the three-phase control state so as to acquire the port voltage.
  3. 3. The system of claim 1, 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 first micro-inverse module, the second micro-inverse module, and the third micro-inverse module are all equal to a preset voltage, and determine that the second terminal has a neutral-to-live reverse connection fault when the port voltages of the first micro-inverse module, the second micro-inverse module, and the third micro-inverse module are not equal to the preset voltage.
  4. 4. The system of claim 3, wherein the gateway controller is configured to determine that there is an opposite connection fault in two ports of the second terminal that are respectively connected to the hot wire end and the neutral wire end of the first micro-inversion module when the port voltages of the first micro-inversion module are a preset voltage and the port voltages of the second micro-inversion module and the third micro-inversion module are not the preset voltage.
  5. 5. The system of claim 3, wherein the gateway controller is configured to determine that there is an opposite connection fault in two ports of the second terminal that are respectively connected to the hot wire end and the neutral wire end of the second micro-inverse module when the port voltages of the second micro-inverse module are the preset voltages and the port voltages of the first micro-inverse module and the third micro-inverse module are not the preset voltages.
  6. 6. The system of claim 3, wherein the gateway controller is configured to determine that there is an opposite connection fault at two ports of the second terminal that are respectively connected to the hot wire end and the neutral wire end of the third micro-inversion module when the port voltages of the third micro-inversion module are a preset voltage and the port voltages of the first micro-inversion module and the second micro-inversion module are not the preset voltage.
  7. 7. The system of claim 3, 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 three 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 three independent connection states of the switch control module.
  11. 11. System according to any of claims 1 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 any one of claims 1 to 10, wherein each of the first, second, and third micro-inverter modules comprises a plurality of micro-inverters connected in parallel.
  13. 13. The system of claim 12, wherein each of the micro-inverters includes a capacitor therein; One end of the capacitor is converged to a live wire end of the micro-inverter module, the other end of the capacitor is converged to a zero line end of the micro-inverter module, and the capacitor and the gateway controller form a loop for PLC communication.

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 present application provides a three-phase wiring detection system comprising: The system 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 communication connection with each micro-inversion module, and is used for respectively obtaining port voltages of the corresponding micro-inversion modules in a three-phase control state, determining whether a zero line and a live line reverse connection fault exists at the second wiring terminal based on the port voltages, wherein the three-phase control state comprises three independent connection states formed by sequentially and independently conducting the first switch, the second switch and the third switch on the premise that the fourth switch is conducted. In some embodiments, the gateway controller is provided with a first PLC communication unit, and the first, second, and third micro-inversion modules are provided with a second PLC communication unit; And the gateway controller is used for carrying out PLC signal interaction between the first PLC communication unit and the second PLC communication unit in the corresponding micro-inversion module respectively under the three-phase control state so as to acquire the port voltage. 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 first micro-inversion module, the second micro-inversion module, and the third micro-inversion module are all equal to a preset voltage, and determine that the second terminal has reverse connection fault between the neutral wire and the live wire when the port voltages of the first micro-inversion module, the second micro-inversion module, and the third micro-inversion module are not equal to the preset voltage. In some embodiments, the gateway controller is configured to determine that a reverse connection fault exists in two ports of the second terminal, where the two ports are respectively connected to a hot line terminal and a neutral line terminal of the first micro inverse module, when the port voltages of the first micro inverse module are preset voltages and the port voltages of the second micro inver