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, fault detection according to conductor type, etc., can solve the problems of insensitive response to changes in electrical quantities, large operating current, and low protection sensitivity, etc., to achieve Improve the reliability and sensitivity of the action, the action speed is fast, and the effect of overcoming the high sampling frequency requirement

Active Publication Date: 2014-06-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

[0044] The single-ended electric quantity full-line quick-action protection method for identifying internal and external faults of HVDC transmission lines mainly uses the amplitude of the electric quantity of a specific frequency in the single-ended DC filter branch to realize the discrimination of internal faults and external faults.

[0045] Follow the steps below:

[0046] 1) In the converter station, the current signal in the local filter branch is obtained from the transformer 8 of the local DC filter 52 branch;

[0047] 2) Calculate the sudden change of current per unit time according to the current signal, and when it is greater than the starting threshold, the system fails;

[0048] 3) Use the digital filter in the control and protection system 6 to filter the local pole current obtained from step 1) to obtain the specific frequency current;

[0049] 4) Calculate the amplitude of the specific frequency current obtained by filtering;

[0050] 5) Compare the amplitude ...

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Abstract

A single-terminal electric-quantity whole-line quick action protection method for identifying faults in and out of a high-voltage direct-current power-transmission line area uses an amplitude of a specific frequency electric-quantity in a single-terminal direct-current filter branch to realize discrimination of the faults in and out of the area. The protection method only needs to adopt the single-terminal electric quantity, has a low requirement for a sampling frequency. The algorithm is simple. Sensitivity is high. The method can be easily realized during engineering. The method not only has advantages that the action speed is fast, selectivity is good and reliability is high, but also the theory is completed and is easy to be adjusted. The protection method can replace current traveling-wave protection which is taken as the main protection of the direct current power transmission line. The method is especially suitable for realizing the whole-line quick action protection of the ultra / super high-voltage direct-current 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 Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/226G01R31/085H02H7/268
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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