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Convertor station direct current filter differential protection method and device

A technology of differential protection device and DC filter, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as malfunction and refusal to operate, so as to reduce the influence of measurement and reduce the risk of malfunction and refusal to operate. Effect

Active Publication Date: 2013-10-09
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a DC filter differential protection method to solve the problems of hidden dangers of malfunction and refusal in existing protection methods

Method used

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  • Convertor station direct current filter differential protection method and device
  • Convertor station direct current filter differential protection method and device
  • Convertor station direct current filter differential protection method and device

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Experimental program
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Effect test

Embodiment 1

[0037] According to the method of the present invention, first collect the current signal IT1 on the high-voltage side of the DC filter and the current signal IT4 on the low-voltage side, and calculate the current difference DIF according to the collected current signals; then judge the differential protection, and the criterion is DIF>Δ+K *IT1 rms , Δ is a constant value, K is the ratio braking coefficient, IT1 rms is the effective value of the high-voltage side current; when the criterion is met, the protection will operate.

[0038] As a DIF with IT1 rms calculation method, Among them, N is the number of sampling in a power frequency cycle, K is the set coefficient, is the average value of the difference between IT1 and IT4 within a power frequency cycle,

Embodiment 2

[0040] In order to implement protection better, carry out protection segmentation: DC filter differential protection is divided into three sections, and each section has different protection settings and corresponding delay and action strategies. The corresponding criteria, delay and action strategy are:

[0041] (1) DIF>Δ1+K1*IT1 rms &IT1 rms <Δ; time delay T1; action strategy: pull open the spacer on the high-voltage side of the DC filter; Δ is the setting value of the arc-drawing capacity of the spacer on the high-voltage side; Δ1 is the first and second protection settings, and K1 is the first The ratio brake coefficient between the first stage and the second stage, T1 is the action delay between the first stage and the second stage; & is the logic and.

[0042] (2) DIF>Δ1+K1*IT1rms &IT1 rms >Δ; time delay T1; action strategy: send a phase-shift locking command to the extreme control system, shut down the HVDC transmission system, trip the AC circuit breaker at the same...

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Abstract

The invention relates to a convertor station direct current filter differential protection method and device. The convertor station direct current filter differential protection device firstly acquires the current on the high voltage side of a direct current filter and the current on the low voltage side of the direct current filter, calculates the difference value of the currents, and then conducts logical judgment and processing according to protection logic. The convertor station direct current filter differential protection method can judge a failure quickly and accurately, and the risks of protection maloperations or protection failures due to the fact that a current transformer is saturated and measurement distortion occurs are avoided when a failure occurs.

Description

technical field [0001] The invention relates to a DC filter differential protection method and setting value setting in a high-voltage direct current transmission project, which is suitable for a high-voltage direct current transmission DC filter protection system. Background technique [0002] The DC filter is an important device in the HVDC transmission system. In the converter station, it is located between the buses on the DC side, such as figure 1 As shown, the two ends of the DC filter are respectively connected to the high-voltage bus and the neutral bus through the high-voltage side spacer and the low-voltage side spacer. [0003] The DC filter differential protection is the main protection in the DC filter protection, which realizes the protection function when the DC filter internal ground fault occurs. The DC filter differential protection collects the current signal of the high-voltage side and the low-voltage side of the DC filter to protect the area between th...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 吴庆范黄金海张爱玲曹森周仁伟田培涛
Owner STATE GRID CORP OF CHINA
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