无变压器非对称式柔性多状态开关的零序抑制策略

XU Feng; LU Yi; LI Jihong; HUANG Xiaoming; ZHU Chengzhi; LU Chengyu

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无变压器非对称式柔性多状态开关的零序抑制策略

更新时间：2025-12-08

- 无变压器非对称式柔性多状态开关的零序抑制策略
- Vol. 45, Issue 10, Pages: 3084-3091(2019)
- 作者机构：
  
  1. 国网浙江省电力有限公司电力科学研究院
  2. 国网浙江省电力有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2019，
  
  Published：2019
- 稿件说明：
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XU Feng, LU Yi, LI Jihong, et al. 无变压器非对称式柔性多状态开关的零序抑制策略[J]. 2019, 45(10): 3084-3091.
DOI：

XU Feng, LU Yi, LI Jihong, et al. 无变压器非对称式柔性多状态开关的零序抑制策略[J]. 2019, 45(10): 3084-3091. DOI：

摘要

柔性多状态开关不使用联接变压器的方式

从而实现设备的紧凑化

但存在零序分量在各供区之间传递、扩大故障影响范围等问题。为此

通过经典的电路分析和序分量分解计算

揭示了零序分量在交直流之间传递的本质特性和内在机理。基于理论分析

提出了一端采用半桥型模块化多电平换流器（modular multilevel converter

MMC）、另一端采用混合型MMC的非对称式柔性多状态开关拓扑结构。根据不同供区所发生的故障情况

提出交流向直流、直流向交流2种零序抑制策略

以及其对应的混合型MMC子模块配置方案。通过PSCAD/EMTDC软件

仿真对比分析了不同供区故障下

零序分量被抑制的特性

验证了理论分析的正确性和非对称式柔性多状态开关及其零序抑制控制策略的有效性。

Abstract

Flexible multi-state switch can make the equipment compact without using the connection transformer. However

there are some problems such as the propagation of zero-sequence components between each power supply area and the expansion of the fault range. Thus

through the classical circuit analysis and sequence component decomposition calculation

the essential characteristics and inherent mechanism of zero-sequence propagation between AC and DC systems are revealed. Moreover

a kind of asymmetrical flexible multi-state switch with a half-bridge modular multilevel converter（MMC） at one end and a hybrid MMC at the other end is proposed. According to the fault situation in different supply areas

two zero-sequence suppression strategies and corresponding sub-module configuration schemes of the hybrid MMC are proposed. In PSCAD/EMTDC software

the characteristics of zero-sequence components suppressed under different supply area faults are compared and analyzed. Finally

the validity of the theoretical analysis and the effectiveness of the asymmetric flexible multi-state switch and its zero sequence control strategy are verified.

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