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Line fault detection method for multi-terminal direct-current power transmission system, device and medium

A technology for DC line faults and power transmission systems, applied to emergency protection circuit devices, fault locations, information technology support systems, etc., can solve the problems of line protection device communication crossover, unfavorable independent operation and maintenance operations, etc., to achieve the convenience of maintenance operations Effect

Active Publication Date: 2020-02-11
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will lead to the problem of communication crossover between the pole control device and the line protection device at both ends of pole 1 and pole 2, which is not conducive to the independent operation and maintenance operation of the structures at both ends of pole 1 and pole 2

Method used

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  • Line fault detection method for multi-terminal direct-current power transmission system, device and medium
  • Line fault detection method for multi-terminal direct-current power transmission system, device and medium
  • Line fault detection method for multi-terminal direct-current power transmission system, device and medium

Examples

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Embodiment 1

[0038] see image 3 , is a schematic flowchart of the steps of a line fault detection method for a multi-terminal direct current transmission system provided by an embodiment of the present invention.

[0039] Embodiment 1 of the present invention provides a line fault detection method for a multi-terminal direct current transmission system, which is suitable for a multi-terminal direct current transmission system including a polarity-switchable converter station, and the multi-terminal direct current system refers to a multi-terminal direct current system that includes multiple converter stations ( rectifier station or / and inverter station) DC transmission system. Its most notable feature is that it can realize multi-power supply, multi-drop power receiving, provide a more flexible power transmission mode, and have various operation modes. The multi-terminal direct current transmission system can be applied to: transmission of electric energy from multiple energy bases to on...

Embodiment 2

[0054] see Figure 4 , is a schematic flowchart of steps of another line fault detection method for a multi-terminal direct current transmission system provided by an embodiment of the present invention. On the basis of the first embodiment above, the line fault detection method of the multi-terminal direct current transmission system further includes steps S21 to S22:

[0055] S21. When the multi-terminal direct current transmission system is in the second operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measuring device of pole 1 in real time, and when it is determined that a pole 1 DC line fault occurs, sends the second Three control instructions to the pole 1 pole control device; wherein, in the second operation mode, the polarity-switchable converter station of the multi-terminal direct current transmission system does not undergo polarity switching;

[0056] S22. The pole control device for pole 1...

Embodiment 3

[0065] see Figure 6 , is a schematic diagram of the circuit structure of a line fault detection device for a multi-terminal direct current transmission system provided by an embodiment of the present invention. The line fault detection device 30 for a multi-terminal direct current power transmission system includes a mode acquisition module 31, a pole 1 line protection device 321 and Pole 1 pole control device 331;

[0066] The mode obtaining module 31 is configured to obtain the operation mode of the multi-terminal direct current transmission system;

[0067] The pole 1 line protection device 321 is used to detect in real time the change of the electrical quantity of the voltage and current measuring device of pole 2 when the multi-terminal direct current transmission system is in the first operation mode, and when it is determined that a pole 2 DC line fault occurs, Sending a first control command to the pole 1 pole control device; wherein, in the first operation mode, the...

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Abstract

The invention discloses a line fault detection method of a multi-terminal direct-current power transmission system. The method is suitable for a multi-terminal direct-current power transmission systemwith a polarity-convertible converter station. When polarity conversion occurs to the polarity-convertible converter station of the multi-terminal direct-current power transmission system, a pole 1 line protection device detects the electrical quantity change of the voltage and current measurement device of a pole 2 in real time, and sends a control instruction to the pole 1 pole control device when judging that a pole 2 direct-current line fault occurs; and the pole 1 pole control device executes clearing operation on the pole 2 direct-current line fault according to the control instruction.The invention further discloses a line fault detection device for the multi-terminal direct-current power transmission system. By acquiring the operation mode of the direct-current power transmissionsystem, the line protection device carries out electric quantity detection on the voltage and current measurement devices of different poles, so that communication independence of the pole control device and the line protection device of the same pole is achieved, and maintenance operation of the system is facilitated.

Description

technical field [0001] The invention relates to the technical field of multi-terminal direct current engineering control and protection, in particular to a line fault detection method, device and medium of a multi-terminal direct current transmission system. Background technique [0002] A typical three-terminal conventional HVDC transmission system with polarity conversion at converter stations includes three converter stations, Station A, Station B, and Station C, and Station B is an intermediate junction station. Each converter station is a bipolar structure, including a pole 1 converter and a pole 2 converter, which can realize three-terminal bipolar operation. Due to the unidirectional conductivity of the thyristor current in the conventional DC converter, the direction of the DC current of the converter is fixed. see figure 1 , is a structural schematic diagram of a three-terminal DC power transmission system including polarity switching at converter stations in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/086H02H7/268Y04S10/52
Inventor 郭铸刘涛黄伟煌曹润彬聂少雄李岩许树楷
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD