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<p>The cascaded H-bridge (CHB) converter, while prized for its high-quality output, faces reliability challenges due to the large number of power switching devices, demanding robust fault-tolerant control (FTC). This study provides a systematic review and analysis of neutral shift (NS) FTC strategies for CHB converters, categorizing them into vector-based (VB) and waveform-based (WB) strategies. The study establishes a multi-dimensional evaluation framework that integrates theoretical principles, visual vector analysis, and quantitative models to elucidate the performance boundaries and implementation trade-offs of these strategies. Simulation results under various fault scenarios confirm the performance of these strategies, quantitatively assessing key metrics such as the amplitude of the symmetrical line voltages and the fundamental component of common-mode (FCCM) voltage. The study concludes with a practical selection framework for FTC strategies and outlines future research directions, offering both theoretical and practical guidance for enhancing fault tolerance in CHB converters.</p>

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A Review of Fault-Tolerant Control Strategies for Neutral Shift in Cascaded H-Bridge Converters

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Huihui Hu,
  • Kuibin Huang,
  • Mingbo Wu,
  • Rende Zhao,
  • Lei Dong

摘要

The cascaded H-bridge (CHB) converter, while prized for its high-quality output, faces reliability challenges due to the large number of power switching devices, demanding robust fault-tolerant control (FTC). This study provides a systematic review and analysis of neutral shift (NS) FTC strategies for CHB converters, categorizing them into vector-based (VB) and waveform-based (WB) strategies. The study establishes a multi-dimensional evaluation framework that integrates theoretical principles, visual vector analysis, and quantitative models to elucidate the performance boundaries and implementation trade-offs of these strategies. Simulation results under various fault scenarios confirm the performance of these strategies, quantitatively assessing key metrics such as the amplitude of the symmetrical line voltages and the fundamental component of common-mode (FCCM) voltage. The study concludes with a practical selection framework for FTC strategies and outlines future research directions, offering both theoretical and practical guidance for enhancing fault tolerance in CHB converters.