基于MMC的柔性直流系统接地方式研究

MEI Nian; CHEN Dong; WU Fangjie; MA Weimin; CHEN Zhao; WEI Zheng

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基于MMC的柔性直流系统接地方式研究

更新时间：2025-12-08

- 基于MMC的柔性直流系统接地方式研究
- Vol. 44, Issue 4, Pages: 1247-1253(2018)
- 作者机构：
  
  国网经济技术研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 May 2018，
  
  Published：2018
- 稿件说明：
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MEI Nian, CHEN Dong, WU Fangjie, et al. 基于MMC的柔性直流系统接地方式研究[J]. 2018, 44(4): 1247-1253.
DOI：

MEI Nian, CHEN Dong, WU Fangjie, et al. 基于MMC的柔性直流系统接地方式研究[J]. 2018, 44(4): 1247-1253. DOI：

摘要

基于模块化多电平换流器的柔性直流系统当采用对称单极接线时

由于没有明显的直流中性母线提供直流侧零电位参考点从而需要附加接地方式。为了给柔性直流系统的接地方式选择提供依据

着重分析了各种接地方式的特点及适用范围

及其在多端柔性直流系统中的应用。然后

分析了不同接地方式下网侧零序电气量（例如电压和电流）向阀侧传播的机理;以及不同接地方式下阀侧零序电气量向变压器侧及直流侧传播的机理。以变压器采用Y0/Yn/Δ接线的实际柔性直流工程为例

对零序电气量传播机理进行了验证。结果表明

当交流系统发生不对称接地故障后变压器第3绕组可有效地屏蔽流入桥臂的零序电流;当桥臂上引入零序电压时变压器第3绕组对网侧绕组零序电流的屏蔽效果取决于变压器网侧通路零序阻抗和变压器第3绕组零序阻抗的比例。

Abstract

In a symmetrical monopolar connection

there is no obvious DC neutral bus to provide zero potential reference for a VSC-HVDC system based on modular multilevel converters（MMC）.To provide a basis for the selection of grounding methods

we summarized characteristics and applicability of various grounding methods for MMC-based VSC-HVDC systems

followed by their applications in multi-terminal VSC-HVDC systems.Then

we analyzed the zero-sequence electrical quantity of each grounding method

such as current and voltage

propagating from AC power grid to converter stations and from each converter arm to both DC side and AC side.With PSCAD simulation of a real VSC-HVDC project with Y0/Yn/Δ connection transformer

the theoretic studies on zero-sequence electrical quantity propagating mechanism were verified.The results show that the zero-sequence current in the converter arm are effectively shielded by the tertiary winding of the transformer under an asymmetric AC-system grounding fault.The shielding effect of zero-sequence current in the AC side winding of the transformer by the tertiary winding of the transformer under a zero-sequence voltage on the converter arm is decided by the ratio of impedance of the zero-sequence circuit on the AC side and that of the tertiary winding of the transformer.

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