Principle and Improvement of the Earth Electrode Overvoltage Protection for an HVDC Project

FENG Dong1; LUO Hai-zhi3; YANG Jie-min4; GUO Qi5

doi:10.13296/j.1001-1609.hva.2011.12.010

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Principle and Improvement of the Earth Electrode Overvoltage Protection for an HVDC Project

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- Principle and Improvement of the Earth Electrode Overvoltage Protection for an HVDC Project
- High VoltageApparatus Vol. 47, Issue 12, Pages: 49-55(2011)
- 作者机构：
  
  1. 中国南方电网超高压输电公司检修试验中心
  2. 华南理工大学电力学院
  3. 中国南方电网超高压输电公司南宁局
  4. 中国南方电网超高压输电公司天生桥局
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2011.12.010
  CLC： TM862
- Published：2011
- 稿件说明：
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[1]冯鸫,罗海志,杨洁民,郭琦.高压直流输电系统接地极过压保护机理及改进措施研究[J].高压电器,2011,47(12):49-55.

FENG Dong1, LUO Hai-zhi3, YANG Jie-min4, et al. Principle and Improvement of the Earth Electrode Overvoltage Protection for an HVDC Project[J]. High voltageapparatus, 2011, 47(12): 49-55.
[1]冯鸫,罗海志,杨洁民,郭琦.高压直流输电系统接地极过压保护机理及改进措施研究[J].高压电器,2011,47(12):49-55. DOI： 10.13296/j.1001-1609.hva.2011.12.010.

FENG Dong1, LUO Hai-zhi3, YANG Jie-min4, et al. Principle and Improvement of the Earth Electrode Overvoltage Protection for an HVDC Project[J]. High voltageapparatus, 2011, 47(12): 49-55. DOI： 10.13296/j.1001-1609.hva.2011.12.010.

摘要

笔者主要分析贵广二回直流输电系统接地极过压保护动作情况

并提出改进措施。首先介绍了接地极过压保护（59EL）原理及动作后果;然后介绍了接地极过压保护（59EL）的保护逻辑

通过分析贵广二回直流在调试过程中59EL保护的动作情况

指出了目前运行中的接地极过压保护的缺陷。为消除保护逻辑缺陷

避免接地极过压保护（59EL）误动作导致单极闭锁、造成双极相继闭锁的扩大事故

提高直流输电系统运行的可靠性

笔者提出了修改贵广二回直流系统接地极过压保护（59EL）逻辑、改进极控系统、直流站控系统程序的改进方案

最后

通过仿真手段对所提出的改进措施进行了试验验证。

Abstract

The principle of the earth electrode overvoltage protection of the Gui-GuangⅡ HVDC Project is analyzed

and the protection logic of the earth electrode overvoltage protection（59EL） is described.Through analyzing the behaviour of 59EL in the commissioning process of the Gui-GuangⅡ HVDC Project

the bugs in the 59EL are found.In order to eliminate the bugs in protection logic

avoid the monopolar block or even bipolar blocks due to misoperation of 59EL

and improve the reliability of HVDC operations

some improvement solutions are offered for modifying 59EL logic in the Gui-GuangⅡ HVDC Project

and improving the programs of pole control system and DC station control system.In addition

RTDS simulations are conducted to verify the proposed improvement solutions.

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