Coordination Strategy Analysis Between the DC Line Failure Recovery Function and Neutral Shifting Protection of Converter Transformer

KONG Xiangping; LI Peng; XU Kai; RUAN Siye

doi:10.13296/j.1001-1609.hva.2022.03.021

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Coordination Strategy Analysis Between the DC Line Failure Recovery Function and Neutral Shifting Protection of Converter Transformer

更新时间：2025-04-26

- Coordination Strategy Analysis Between the DC Line Failure Recovery Function and Neutral Shifting Protection of Converter Transformer
- High VoltageApparatus Vol. 58, Issue 3, Pages: 155-162(2022)
- 作者机构：
  
  1. 国网江苏省电力有限公司电力科学研究院
  2. 国家电力调度控制中心
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2022.03.021
  CLC： TM721.1
- Published：2022
- 稿件说明：
移动端阅览
KONG Xiangping, LI Peng, XU Kai, et al. Coordination Strategy Analysis Between the DC Line Failure Recovery Function and Neutral Shifting Protection of Converter Transformer[J]. High voltageapparatus, 2022, 58(3): 155-162.
DOI：

KONG Xiangping, LI Peng, XU Kai, et al. Coordination Strategy Analysis Between the DC Line Failure Recovery Function and Neutral Shifting Protection of Converter Transformer[J]. High voltageapparatus, 2022, 58(3): 155-162. DOI： 10.13296/j.1001-1609.hva.2022.03.021.

摘要

文中对一起现场故障案例中直流线路故障再启动失败后逆变站换流变中性点偏移保护动作的机理进行了分析，指出保护动作的原因是由于直流线路故障点与整流站Z闭锁投入的旁通对形成了对健全极直流电流的分流回路，导致故障点无法熄弧、整流站旁通对无法关断；然后，逆变站Y闭锁投入的旁通对与整流站旁通对再次形成了分流回路，导致逆变站换流变单相接地，换流变中性点偏移保护动作。进一步地，结合直流输电工程运行情况，提出了可有效避免逆变站旁通对与线路故障点、整流站旁通对形成分流回路，换流变中性点偏移保护动作的改进措施。

Abstract

The mechanism of neutral shifting protection action of converter transformer in the inverter station after the failure of DC line failure recovery sequence in one site fault case is analyzed in this paper. It is pointed out that the reason of the protection action is that bypass pair of the DC line fault point and the locking operation of rectifier station Z forms a branch loop for the DC current of the healthy pole

causing the arc of the fault point not be interrupted and the bypass pair not be turned off. Then

the bypass pair of inverter station caused by the Y locking operation and the bypass pair of rectifier station form current branch loop again

causing the single phase of the converter transformer to ground and the neutral shifting protection to trip. Furthermore

the improvement measures which can prevent the development of the current branch loop and the trip of converter transformer neutral shifting protection are proposed by taking the operating condition of the DC transmission project into consideration.

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