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Method for identifying bipolar short-circuit fault in direct current line

A bipolar short circuit and fault identification technology, which is applied to fault locations, measuring devices, instruments, etc., can solve problems such as the slow speed of bipolar short circuit fault identification and cannot meet application requirements, and meet the requirements of rapidity and avoid misjudgment Effect

Inactive Publication Date: 2017-12-15
XUJI GRP +3
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  • Abstract
  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for identifying bipolar short-circuit faults of DC lines, which is used to solve the technical problem that the identification speed of bipolar short-circuit faults in the prior art is slow and cannot meet the application requirements

Method used

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  • Method for identifying bipolar short-circuit fault in direct current line
  • Method for identifying bipolar short-circuit fault in direct current line
  • Method for identifying bipolar short-circuit fault in direct current line

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Embodiment Construction

[0023] The specific implementation manner of the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0024] Such as figure 1 As shown, the identification method of the bipolar short-circuit fault of the DC line includes the following steps:

[0025] Step 1, obtain positive and negative bus voltage, current, voltage change rate and current change rate.

[0026] Specifically, optical transformers are used to obtain identification data such as positive and negative DC bus voltages, currents, voltage change rates, and current change rates. In order to ensure the rapidity of data transmission, in this embodiment, the upload data cycle of optical transformers is 20us .

[0027] Step 2, judging whether the voltage change rate and current change rate of the positive and negative busbars meet the set fault identification and pre-judgment conditions.

[0028] Among them, the pre-judgment conditions for fault identification ar...

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Abstract

The invention relates to a method for identifying a bipolar short-circuit fault in a direct current line. The method includes the steps of acquiring a negative electrode bus voltage, a current, a voltage change rate, and a current change rate; judging whether positive and negative electrode bus voltage change rates and current change rates satisfy set fault identification pre-judgment conditions; if the fault identification pre-judgment conditions are satisfied, judging whether the positive and negative electrode bus voltages and currents satisfy set fault identification pre-judgment conditions; and if the fault identification pre-judgment conditions are satisfied, judging that a bipolar short-circuit fault occurs to the system. According to the invention, whether the bipolar short-circuit fault occurs to the system is pre-judged according to the positive and negative electrode bus voltage change rates and current change rates, then whether the bipolar short-circuit fault occurs to the system is further determined through the positive and negative electrode bus voltages and currents, the fault identification can be quickly and accurately completed within 0.1ms, and the requirements of quick and accurate detection of the bipolar short-circuit fault in a DC circuit breaker DC line can be satisfied.

Description

technical field [0001] The invention relates to a method for identifying bipolar short-circuit faults of DC lines, and belongs to the technical field of DC transmission in power systems. Background technique [0002] With the development of VSC-HVDC power transmission technology to VSC-HVDC grid, higher requirements are put forward for the reliability, stability and safe operation of the whole system. The huge challenge is the breaking of short-circuit current in VSC-HVDC power grid. Compared with the AC system, the time constant in the VSC-HVDC power grid is small, the short-circuit current rises quickly, and at the same time causes the drop of the DC voltage, and even causes the inverter and the short-circuit current to run out of control, and the DC current is difficult to open due to the lack of a natural zero-crossing point. broken. HVDC circuit breakers capable of quickly disconnecting or isolating short-circuit faults have become a bottleneck in the development of V...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/088G01R31/50
Inventor 马俊杰胡四全胡亮董朝阳马太虎吉攀攀孟学磊郑帅赵晓杰
Owner XUJI GRP
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