HVDC power-transmission whole-line speed protection method by using direct-current filter current

A DC filter, high-voltage DC technology, applied in emergency protection circuit devices, electrical components, and fault detection according to conductor types, etc., can solve the problems of insensitive response to changes in electrical quantity, large operating current, and low protection sensitivity. Improve the reliability and sensitivity of action, fast action speed, and overcome the effect of high sampling frequency requirements

Active Publication Date: 2012-06-27
XI AN JIAOTONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the large operating current of the line, it is not sensitive to the change of electrical quantity when a fault occurs, which makes the protection sensitivity low

Method used

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  • HVDC power-transmission whole-line speed protection method by using direct-current filter current
  • HVDC power-transmission whole-line speed protection method by using direct-current filter current
  • HVDC power-transmission whole-line speed protection method by using direct-current filter current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The single-ended electrical quantity full-line quick-acting protection method for identifying internal and external faults of HVDC transmission lines mainly uses the amplitude of the electrical quantity of a specific frequency in the branch of the single-ended DC filter to realize the discrimination of internal faults and external faults.

[0044] Follow these steps:

[0045] 1) In the converter station, obtain the current signal of the local pole from the transformer 8 of the branch of the DC filter 52 of the local pole;

[0046] 2) Calculate the sudden change of current per unit time according to the current signal, when it is greater than the starting threshold value, the system fails;

[0047] 3) Utilize the digital filter in the control protection system 6 to filter the local current obtained from step 1) to obtain a specific frequency current amount;

[0048] 4) Calculate the amplitude of the specific frequency current obtained by filtering;

[0049] 5) Compare ...

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PUM

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Abstract

The invention relates to a power-system direct current power transmission line relay protection field and especially relates to a single-terminal electric-quantity whole-line quick action protection method which can be used to identify faults in and out of an HVDC transmission line area. An amplitude of a specific frequency component in a single-terminal direct-current filter branch is used to realize discrimination of the faults in and out of the area. The method of the invention is used to protect a single-terminal whole-line quick action in the direct current power transmission line of the power system. The protection can be achieved only by using the single-terminal electric quantity. The method has a low requirement to a sampling frequency. An algorithm is simple. Sensitivity is high. The method can be realized during engineering. The action speed is fast, selectivity is good and reliability is high. A theory is completed and is easy to be adjusted. The protection method of the invention can replace current traveling-wave protection which is taken as the main protection of the direct current power transmission line. And the method is especially suitable for realizing the whole-line quick action protection of the ultra/super HVDC power transmission line by using the single-terminal electric quantity.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and specifically relates to a full-line rapid protection method for a high-voltage direct current transmission line using direct current filter current. Background technique [0002] High-voltage direct current (HVDC) transmission has the advantages of large transmission power, low line cost, and good control performance. It occupies an increasingly important position in long-distance and high-power transmission. Developed countries in the world regard it as a large-capacity, long-distance The main means of power transmission and asynchronous networking has also become a hot spot in power construction in my country because of "power transmission from west to east, mutual supply between north and south, and national networking". Since Gezhouba-Shanghai adopted DC transmission in 1989, the number of DC transmission projects in my country has ranked first in the world. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/226H02H7/26H02H7/268G01R31/085
Inventor 宋国兵褚旭高淑萍索南加乐靳幸福冉孟兵
Owner XI AN JIAOTONG UNIV
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