Novel double end fault location method for double DC circuits on same tower

A DC line, double-circuit technology on the same tower, which is applied in the direction of detecting faults and fault locations according to conductor types, and can solve problems such as high requirements for precise clock synchronization

Active Publication Date: 2016-10-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, time-domain single-ended traveling wave ranging requires further research on the reliability of traveling wave head calibration and wave head identification, and the automation of ranging analysis; time-domain double-ended traveling wave Wave arrival time difference, the reliability and accuracy of the initial traveling wave calibration can be easily guaranteed, and there is no need to identify the reflected wave at the fault point, but the double-ended traveling wave ranging requires high precision synchronization of clocks at both ends of the line

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  • Novel double end fault location method for double DC circuits on same tower
  • Novel double end fault location method for double DC circuits on same tower
  • Novel double end fault location method for double DC circuits on same tower

Examples

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Effect test

Embodiment 1

[0061] Example 1: using as figure 1 The ±500kV same-tower double-circuit DC transmission system shown. The total length of the line is 1286km, with four-split conductors, 0.3H smoothing reactors installed on both sides of the line, and a single 12-pulse valve group wiring for each pole. The rated transmission power is 6400MW and the rated current is 3200A. The sampling rate is set to 1M. Assuming that the electrical quantities on the rectifier side and the inverter side can be measured, if a metal ground fault occurs at a distance of M600km from the measurement terminal of the rectifier side within the half-line length of the positive pole IP of the I loop.

[0062] According to step 1, the fault component waveforms of each pole-to-line voltage of the measurement terminals M and N on the rectifier side are obtained, respectively as follows figure 2 and image 3 According to step 2, formula (2) is used to perform voltage decoupling transformation on the pole line voltage ab...

Embodiment 2

[0063] Example 2: using as figure 1 The ±500kV same-tower double-circuit DC transmission system shown. The total length of the line is 1286km, with four-split conductors, 0.3H smoothing reactors installed on both sides of the line, and a single 12-pulse valve group wiring for each pole. The rated transmission power is 6400MW and the rated current is 3200A. The sampling rate is set to 1M. Assuming that the electrical quantities on the rectifier side and the inverter side can be measured, if the distance between the rectifier side measurement terminal M and 900km beyond the half-line length of the positive pole IP of the I loop, a metallic ground fault occurs.

[0064] According to step 1, the fault component waveforms of each pole-to-line voltage of the measurement terminals M and N on the rectifier side are obtained, respectively as follows Figure 8 and Figure 9 According to step 2, formula (2) is used to perform voltage decoupling transformation on the pole line voltage ...

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Abstract

The invention relates to a novel double end fault location method for double DC circuits on same tower and belongs to the technical field of power system relay protection. The method includes steps of obtaining voltage of a measuring end M and a measuring end N and solving a fault component and solving a line mode voltage component by adopting phase mode conversion when the double DC circuits on same tower meets a grounding fault; applying a Bergeron transfer equation and the measuring end line mode voltage component for calculating line-side voltage and current travelling wave variations; cubing a product of the line-side voltage traveling wave variation of the a measuring end M and the line-side current traveling wave variation of the measuring end N and constructing a fault location function through integrating in an observation time window; realizing fault location through combining line-side mutation rules of the fault location function and the polarity of the wavelet transform modulus maxima of fault voltage traveling waves. According to the invention, fault location is performed for the double DC circuits on same tower and the principle is simple. Wave heads of the fault traveling waves do not need to marked and influence caused by fault instantaneity, fault transition resistance variation and the like is eliminated. The fault location result is accurate and reliable.

Description

technical field [0001] The invention relates to a novel double-terminal fault location method for a double-circuit DC line on the same tower, and belongs to the technical field of power system relay protection. Background technique [0002] The DC line is an important part of the double-circuit DC transmission system on the same tower. Its voltage level is high, and the transmission distance is long. During the process of transmitting large-capacity power, the environment in the region is harsh, and it is easy to cause failure. Precise location technology for fault point of DC line helps to quickly and accurately determine the fault location, reduce blindness of line patrol, and speed up the restoration of power transmission. DC line fault location mostly adopts traveling wave principle. Most of the current traveling wave ranging methods are based on the time-domain characteristics of fault traveling waves and observe, describe, and calibrate the wave head on the time axis,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 田鑫萃束洪春
Owner KUNMING UNIV OF SCI & TECH
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