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

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 problems such as communication crossover of line protection devices, unfavorable independent operation and maintenance operations, and achieve convenient maintenance operations Effect

Active Publication Date: 2021-07-30
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, device and medium for multi-terminal direct current transmission system
  • Line fault detection method, device and medium for multi-terminal direct current transmission system
  • Line fault detection method, device and medium for multi-terminal direct current transmission system

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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 DC power transmission system, which is suitable for a multi-terminal DC power transmission system with a polarity-switchable converter station. When the polarity is switched, the pole 1 line protection device detects the electrical quantity change of the pole 2 voltage and current measuring device in real time, and sends a control command to the pole 1 pole control device when it determines that a pole 2 DC line fault occurs; the pole 1 pole control The device executes the operation of clearing the fault of the pole 2 DC line according to the control instruction. The invention also discloses a line fault detection device for a multi-terminal direct current transmission system. By acquiring the operation mode of the direct current transmission system, the line protection device detects the electrical quantity of voltage and current measuring devices of different poles, so as to realize the same pole control device and The communication of the line protection device is independent, which is convenient for the maintenance and operation of the system.

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 Patents(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