A Novel Hybrid Modular Multilevel Converters Based on Dual Half-bridge Reconstructed Submodule for Fault Blocking

GENG Zhi; XIAO Yang

doi:10.14044/j.1674-1757.pcrpc.2025.02.011

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A Novel Hybrid Modular Multilevel Converters Based on Dual Half-bridge Reconstructed Submodule for Fault Blocking

Key Technology of Grid-friendly Control and Optimized Operation for New Energy Base | 更新时间：2025-04-29

- A Novel Hybrid Modular Multilevel Converters Based on Dual Half-bridge Reconstructed Submodule for Fault Blocking
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 2, Pages: 90-97(2025)
- 作者机构：
  
  苏州大学轨道交通学院，江苏　苏州　 215131
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2025.02.011
  CLC：
- Received：25 February 2025，
  
  Published：25 April 2025
- 稿件说明：
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GENG Zhi, XIAO Yang. A Novel Hybrid Modular Multilevel Converters Based on Dual Half-bridge Reconstructed Submodule for Fault Blocking[J]. Power capacitor & reactive power compensation, 2025, 46(2): 90-97.
DOI：

GENG Zhi, XIAO Yang. A Novel Hybrid Modular Multilevel Converters Based on Dual Half-bridge Reconstructed Submodule for Fault Blocking[J]. Power capacitor & reactive power compensation, 2025, 46(2): 90-97. DOI： 10.14044/j.1674-1757.pcrpc.2025.02.011.

摘要

直流故障会对模块化多电平变换器（MMC）的可靠运行产生不利影响，并损坏MMC内的器件。基于具有阻断能力子模块（SM）的直流故障处理是一种有效保护方法。本文详细分析了几种能够实现直流故障阻断的SM类型。研究表明，三电平阻断SM在直流故障处理方面优于其他类型SM。随后，本文提出了一种双半桥重构型三电平阻断SM。通过三电平特性，所提SM能够输出传统全桥SM（FBSM）两倍的工作电压。此外，该SM还具备FBSM两倍的阻断能力。与现有的三电平SM不同，所提SM的正负端通过两个串联逆阻型开关连接。由于这一结构，采用所提SM的MMC在相似成本的情况下，可以进一步降低运行损耗。仿真结果验证了所提SM的可行性。

Abstract

The DC faults can impose adverse influence on reliable operation of modular multilevel converter (MMC) and damage the elements in MMC. The DC fault handling based on the SM with blocking capability is an effective protection method. In this paper

several kinds of SM capable of DC fault blocking are analyzed in detail. The study results show that the three-level blocking SM are superior to other types of blocking SM in the handling of DC fault. Afterward

a dual half-bridge reconstructed three-level blocking SM is proposed in this paper. With the three-level feature

the proposed SM can output twice the operating voltages of the conventional full-bridge SM (FBSM). Moreover

the SM can provide twice the blocking capability of the FBSM. Different from the existing three-level SM

the positive and negative ends of the proposed SM are connected by two cascaded reverse-blocking switches. Owing to this structure

the MMC with the proposed SM can further reduce operating loss on the basis of the similar costs as the MMC with the existing three-level SM. Finally

the feasibility of the proposed SM is verified by simulation results.

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