Research on DC Bias Protection of AC System of Jiuquan-Hunan ±800 kV DC Transmission Lines Sending End

TANG Bo; YANG Jiawei; HUA Xia; HUANG Li; HAO Bin

doi:10.13296/j.1001-1609.hva.2020.04.020

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Research on DC Bias Protection of AC System of Jiuquan-Hunan ±800 kV DC Transmission Lines Sending End

更新时间：2025-04-26

- Research on DC Bias Protection of AC System of Jiuquan-Hunan ±800 kV DC Transmission Lines Sending End
- High VoltageApparatus Vol. 56, Issue 4, Pages: 125-132(2020)
- 作者机构：
  
  1. 三峡大学电气与新能源学院
  2. 甘肃电力科学研究院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.04.020
  CLC： TM721.1
- Published：2020
- 稿件说明：
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[1]唐波,杨嘉炜,华夏,黄力,郝斌.酒泉—湖南±800 kV直流线路送端交流系统直流偏磁防护[J].高压电器,2020,56(04):125-132.

TANG Bo, YANG Jiawei, HUA Xia, et al. Research on DC Bias Protection of AC System of Jiuquan-Hunan ±800 kV DC Transmission Lines Sending End[J]. High voltageapparatus, 2020, 56(4): 125-132.
[1]唐波,杨嘉炜,华夏,黄力,郝斌.酒泉—湖南±800 kV直流线路送端交流系统直流偏磁防护[J].高压电器,2020,56(04):125-132. DOI： 10.13296/j.1001-1609.hva.2020.04.020.

TANG Bo, YANG Jiawei, HUA Xia, et al. Research on DC Bias Protection of AC System of Jiuquan-Hunan ±800 kV DC Transmission Lines Sending End[J]. High voltageapparatus, 2020, 56(4): 125-132. DOI： 10.13296/j.1001-1609.hva.2020.04.020.

摘要

酒泉—湖南±800 kV直流送端侧在模拟单极—大地运行时

周边系统变压器出现了直流偏磁现象。为解决酒泉—湖南直流引起的送端系统直流偏磁防护问题

提出了采用阻容结合抑直、分步治理的思想实现送端电网防护。在此基础上

为保证抑直装置接入对系统运行影响最小

从直流防护效果、绝缘电压等级和保护影响3个方面进行分析并选取阻容参数;最后

建立交流系统等效直流模型。经计算分析

变压器的偏磁电流被控制在阈值范围内

达到了预期的防护效果。

Abstract

When the Jiuquan-Hunan±800 kV DC project is operating in the simulation of muipolar-earth grounnd

the phenomenon of DC magnetic bias appeares in the transformer of the surrounding system.In order to solve the problem of DC bias protection of the system caused by Jiu-Hu DC project

the idea of using resistance-capacity combined with restraining straight and a step-by-step governance strategy is proposed to realize the protection of the power grid system.On this basis

in order to ensure that the installation of the R-C device has the least impact on the system operation.This paper analyzes from 3 aspects of the DC protection effect

insulation voltage level and the protection impact to choose the RC parameters;finally

the equivalent DC model of the AC system is established.Through calculation and analysis

the bias current of the transformer is controlled within the threshold range

which achieves the expected protective effect.

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