Power Balance Modulation for Cascaded H-Bridge Inverters via Carrier Optimization

IF 5.7 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Emerging and Selected Topics in Power Electronics Pub Date : 2026-10-01 Epub Date: 2026-03-11 DOI:10.1109/JESTPE.2026.3691928

Jun Gu;Yu Liu;Xiang Zhu;Qiangqiang Ning;Jiamin Pan;Song Li

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Abstract

Cascaded H-bridge (CHB) inverters are widely used in medium-voltage, high-power motor drives, photovoltaic grid-connected systems, and energy storage systems due to their high modularity and ease of scalability. However, traditional modulation strategies face the inherent tradeoff between power balancing and harmonic optimization. Imbalanced output power or poor harmonic characteristics of the output voltage directly compromise the quality of the inverter’s output voltage waveform. To address the aforementioned issues, an improved carrier-layered (ICL) technology is proposed. Through carrier reconstruction, it achieves optimal total harmonic distortion (THD) while utilizing redundant switching states to uniformly distribute power across cascaded units. This strategy, based on universal constraints, can be directly extended to n-unit topologies, maintaining power balance among remaining units even after any unit failure. Finally, the effectiveness of this strategy is validated through theoretical analysis, simulation, and experimental verification.

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基于载波优化的级联h桥逆变器功率平衡调制

级联h桥（CHB）逆变器因其高模块化和易于扩展而广泛应用于中压、大功率电机驱动、光伏并网系统和储能系统中。然而，传统的调制策略面临着功率平衡与谐波优化之间的内在权衡。输出功率不平衡或输出电压谐波特性差直接影响逆变器输出电压波形的质量。为了解决上述问题，提出了一种改进的载波分层（ICL）技术。通过载波重构，实现了最优的总谐波失真（THD），同时利用冗余开关状态在级联单元之间均匀分配功率。这种基于通用约束的策略可以直接扩展到n单元拓扑，即使在任何单元失效后，也可以保持剩余单元之间的功率平衡。最后，通过理论分析、仿真和实验验证了该策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Journal of Emerging and Selected Topics in Power Electronics ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

12.50

自引率

9.10%

发文量

547

审稿时长

3 months

期刊介绍： The aim of the journal is to enable the power electronics community to address the emerging and selected topics in power electronics in an agile fashion. It is a forum where multidisciplinary and discriminating technologies and applications are discussed by and for both practitioners and researchers on timely topics in power electronics from components to systems.