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A double-terminal fault location method for double-circuit DC transmission lines on the same tower with wave velocity correction

A DC transmission line, double-circuit technology on the same tower, applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as line length deviation, affecting distance measurement accuracy, etc.

Active Publication Date: 2019-01-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a double-terminal fault distance measurement method for double-circuit direct current transmission lines on the same tower with wave velocity correction, which is used to solve the problem that the traditional double-terminal distance measurement method depends on the total length of the transmission line, the actual line length and the engineering design line. The length deviation affects the distance measurement accuracy

Method used

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  • A double-terminal fault location method for double-circuit DC transmission lines on the same tower with wave velocity correction
  • A double-terminal fault location method for double-circuit DC transmission lines on the same tower with wave velocity correction
  • A double-terminal fault location method for double-circuit DC transmission lines on the same tower with wave velocity correction

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Embodiment 1

[0070] Example 1: Establish as attached figure 1 As shown, the Xiluodu-Guangdong ±500kV double-circuit DC transmission system on the same tower is used as the simulation model. Each pole of the system consists of two 12-pulse converters connected in series, and the total length of the DC transmission line is 1286km. 0.3H smoothing reactors are installed on both sides of the line. Assume now that a ground fault occurs 400km away from the rectifier side M terminal of the secondary negative line IIN, and the transition resistance is 0Ω.

[0071] According to the first step, the arrival time of the line-mode fault component voltage on the rectifier side and the inverter side is obtained: the phase-mode transformation matrix is ​​used to decouple the fault component voltage on the rectifier side and the inverter side after a single-pole ground fault occurs on the transmission line, and the line-mode fault component voltage is obtained. Fault component voltage traveling wave u M...

Embodiment 2

[0072] Example 2: Establish as attached figure 1 As shown, the Xiluodu-Guangdong ±500kV double-circuit DC transmission system on the same tower is used as the simulation model. Each pole of the system consists of two 12-pulse converters connected in series, and the total length of the DC transmission line is 1286km. 0.3H smoothing reactors are installed on both sides of the line. Assume now that a ground fault occurs 860km away from the rectifier side M terminal on the positive line IP, and the transition resistance is 200Ω.

[0073] According to the first step, the arrival time of the line-mode fault component voltage on the rectifier side and the inverter side is obtained: use the decoupling transformation matrix to decouple the fault component voltage on the rectifier side and the inverter side after a unipolar ground fault occurs on the transmission line, and obtain the line-mode fault component voltage Mode fault component voltage traveling wave u M，mode with u N，mode ...

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Abstract

The invention relates to a same-tower double-circuit DC transmission line double end range finding method having wave velocity correction and belongs to the technical field of electric power system protection. The method includes the following steps: firstly acquiring a line rectification side and inversion side voltage fault component, adopting a phase-model transformation matrix to decouple the voltage fault component and resolve an aerial mode fault component voltage traveling wave; calculating the wavelet transform modulus maxima of the aerial mode fault component voltage traveling wave, obtaining the time t"M, t"N corresponding to the first and the second modulus maxima points; earth faults are arranged every 10 km along the whole length of the same-tower double-circuit DC transmission line and resolving the wave velocities of the earth faults, fitting the wave velocities of the earth faults to obtain an aerial mode wave velocity curve, adopting the iterative method to resolve an aerial mode fault voltage wave velocity v; secondly substituting the aerial mode fault voltage wave velocity v and the time t"M and t"N corresponding to the wavelet transform modulus maxima to a fault range finding formula to resolve x; based on the polarity of the front two modulus maxima points of the aerial mode fault component voltage traveling wave at the rectification side M terminal after head wave alignment, it can be determined that the fault point occurs within a half line length from the rectification side M terminal or out of the half line length.

Description

technical field [0001] The invention relates to a double-terminal fault distance measurement method of a double-circuit direct current transmission line on the same tower with wave velocity correction, and belongs to the technical field of electric power system protection. Background technique [0002] The double-circuit DC transmission technology on the same tower has good economic benefits because it saves transmission corridors and improves land utilization. It has been used in DC transmission projects, but there is electromagnetic coupling between the pole lines, and any pole line fails Corresponding electrical changes are coupled on non-fault pole lines, which has a certain impact on accurate fault location. The traditional double-terminal distance measurement method has high measurement accuracy, but it needs to measure the total length of the line, the wave velocity, and the arrival time of the fault initial traveling wave detected by the measuring end at both ends. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 束洪春钟通运田鑫萃
Owner KUNMING UNIV OF SCI & TECH
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