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Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region

A technology for DC transmission lines and transmission lines, which is applied to fault locations, electrical components, emergency protection circuit devices, etc., and can solve problems such as poor selectivity, low reliability, and high sampling rate requirements for DC line relay protection devices

Active Publication Date: 2014-04-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the DC line relay protection device requires a high sampling rate, and there are problems of poor selectivity, low sensitivity, and low reliability.

Method used

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  • Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region
  • Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region
  • Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The full-line fast protection method of single-ended electrical quantity for identifying internal and external faults of HVDC transmission lines mainly utilizes the amplitude of electrical quantities of specific frequencies on the DC line side of single-ended converter stations to distinguish internal faults and external faults.

[0055] Follow the steps below:

[0056] 1) In the converter station, the current signal of the local pole is obtained from the sensor on the side of the direct current transmission line of the local pole;

[0057] 2) Calculate the sudden change of current per unit time according to the current of the pole, and start protection when it is greater than the starting threshold;

[0058] 3) Use the digital filter in the control and protection system to filter the local pole current obtained from step 1 to obtain the specific frequency current;

[0059] 4) Calculate the amplitude of the specific frequency current obtained by filtering;

[0060] 5)...

Embodiment 2

[0072] The full-line fast protection method of single-ended electrical quantity for identifying internal and external faults of HVDC transmission lines mainly uses the amplitude of electrical quantities of specific frequencies on the DC line side of single-ended converter stations to distinguish internal faults and external faults.

[0073] Follow the steps below:

[0074]1) In the converter station, the local pole voltage signal and the local pole current signal are obtained from the sensor on the side of the local pole DC transmission line;

[0075] 2) Calculate the current mutation per unit time according to the current signal of the local pole, and start protection when it is greater than the starting threshold;

[0076] 3) Use the digital filter in the control and protection system to filter the local voltage signal obtained in step 1 to obtain a specific frequency voltage;

[0077] 4) Calculate the amplitude of the specific frequency voltage obtained by filtering;

[0...

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Abstract

The invention relates to the field of relay protection of direct-current transmission lines of power systems, in particular to a single-ended electrical quantity full-time quick-action protection method for recognizing faults inside and outside a high-voltage direct-current transmission line region. The faults inside and outside the high-voltage direct-current transmission line region are recognized by using an amplitude of a special frequency component of electrical quantity of the direct-current line side of a single-ended convertor station. The invention is mainly used in single-ended electrical quantity full-line quick-action protection of the direct-current transmission line in the power system, only needs to adopt the singe-ended electrical quantity, has low requirement on the sampling frequency and a simple algorithm, is easy to realize on the engineering, has the advantages of high action speed, good selectivity and high reliability, and is complete in theory and easy to integrate. The protection method in the invention can be used as the main protection of the direct-current transmission line instead of the traditional traveling wave protection, and is especially suitable for full-line quick-action protection of extra / super high-voltage direct-current transmission lines by using single-ended electrical quantity.

Description

technical field [0001] The invention belongs to the technical field of relay protection for power systems, and specifically relates to a full-line rapid protection method for identifying internal and external faults of high-voltage direct current transmission lines by using single-ended electrical quantities. 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 project...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 宋国兵高淑萍索南加乐蔡新雷
Owner XI AN JIAOTONG UNIV
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