Investigating the Impacts of ±800 k V Tian-Zhong HVDC Project on Transformer DC Magnetic Bias in Hami Power Grid via Simulation and Measurement

WANG Jian; MA Qinyong; CHANG Xiqiang

doi:10.13296/j.1001-1609.hva.2015.11.028

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Investigating the Impacts of ±800 k V Tian-Zhong HVDC Project on Transformer DC Magnetic Bias in Hami Power Grid via Simulation and Measurement

更新时间：2025-04-26

- Investigating the Impacts of ±800 k V Tian-Zhong HVDC Project on Transformer DC Magnetic Bias in Hami Power Grid via Simulation and Measurement
- High VoltageApparatus Vol. 51, Issue 11, Pages: 168-175(2015)
- 作者机构：
  
  1. 国网新疆电力公司电力科学研究院
  2. 国网新疆电力公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2015.11.028
  CLC： TM721.1
- Published：2015
- 稿件说明：
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[1]王建,马勤勇,常喜强.±800kV天—中直流对哈密电网变压器直流偏磁影响的仿真和实测研究[J].高压电器,2015,51(11):168-175.

WANG Jian, MA Qinyong, CHANG Xiqiang. Investigating the Impacts of ±800 k V Tian-Zhong HVDC Project on Transformer DC Magnetic Bias in Hami Power Grid via Simulation and Measurement[J]. High voltageapparatus, 2015, 51(11): 168-175.
[1]王建,马勤勇,常喜强.±800kV天—中直流对哈密电网变压器直流偏磁影响的仿真和实测研究[J].高压电器,2015,51(11):168-175. DOI： 10.13296/j.1001-1609.hva.2015.11.028.

WANG Jian, MA Qinyong, CHANG Xiqiang. Investigating the Impacts of ±800 k V Tian-Zhong HVDC Project on Transformer DC Magnetic Bias in Hami Power Grid via Simulation and Measurement[J]. High voltageapparatus, 2015, 51(11): 168-175. DOI： 10.13296/j.1001-1609.hva.2015.11.028.

摘要

±800 k V天—中特高压直流工程于2013年投运

天山换流站地处哈密电网变电站集中地带

其接地极位置较为特殊

为研究天中直流在单极大地方式运行时对哈密电网变压器直流偏磁的影响

通过交流电网直流电流分布计算软件仿真计算分析了哈密电网变压器直流分布的情况

同时在系统高端调试期间对换流站所在的哈密地区电网直流偏磁进行了多点测量

积累了大量实测数据。仿真结果表明

在天中直流大功率单极大地运行时

离天山换流站较近的220 k V中性点接地变压器中性点直流电流较大

实测也发现与仿真类似的结果

仿真结果与实测数据基本相符合

严重威胁主变偏磁运行

后期通过在直流电流过大的主变加装了直流偏磁抑制装置

实测表明其大大降低了变压器中性点的偏磁电流

提高了哈密地区电网的安全性和可靠性。

Abstract

The ±800 k V Tian-Zhong HVDC project was put into operation in 2013

and its Tianshan converter station is located in the centralized substation area of Hami electric grid

where grounding pole location is rather special. To investigate the impacts of the ±800 k V Tian-Zhong HVDC project on transformer DC magnetic bias in Hami power grid

the calculation software of AC power grid DC current distribution was employed to analyze the DC current distribution of the transformer in Hami power grid by means of simulation. And the multi-point measurement of the transformer DC magnetic bias in Hami power grid

where the Tianshan DC converter station is located in

was conducted. Simulation shows that when the Tian-Zhong HVDC project operated with high power in monopole earth mode

the DC current at the neutral point of the neutral-grounded 220 V transformer nearer to the Tianshan DC converter station got larger. The simulation results coincide with the measured ones. This situation harms the safe operation of the main transformer with magnetic bias current. Subsequently

a DC magnetic bias suppression device was added to the main transformer with large neutral DC current

hence the DC magnetic bias current was greatly reduced.

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