基于耦合效应消除的单相级联H桥整流器电容电压平衡控制策略

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关键词：单相级联H桥整流器;电容电压平衡;耦合效应消除;占空比补偿分量;解耦控制；无功功率平衡

DOI：10. 15938/j. emc. 2025.09.013

中图分类号：TM461 文献标志码：A 文章编号：1007-449X（2025）09-0138-09

Abstract：To eliminate the coupling efect among the capacitor voltage balance control，outer-loop average voltage control，and inner-loop current control of the single-phase cascaded H-bridge （CHB） rectifier，a capacitor voltage balance control strategy based on coupling effect elimination was proposed. Firstly， based on the mathematical model of single-phase CHB rectifier，the generation mechanism of coupling effect of the capacitor voltage balancing control on the outer-loop average voltage control and inner-loop current control was analyzed in detail. Secondly，according to the generation mechanism of the coupling effect，the reference voltage design method of the outer-loop average voltage controllr was presented，to eliminate the coupling effct of the voltage balancing control on the outer-loop voltage control. Then，the active and reactive duty cycle compensation components of each H-bridge module were designed，to eliminate the influence of the voltage balancing control on the inner-loop current control.Finally，the feasibilityand validity of the proposed strategy was verified. Simulation and experimental results demonstrate that the proposed method can achieve the decoupling between the voltage balancing control and the outer-loop average voltage control and inner-loop current control，as well as the balance of the capacitor voltage and reactive power of each H-bridge module.

Keywords：single-phase cascaded H-bridge rectifier; capacitor voltage balancing；coupling efect elimination；duty cycle compensation component； decoupling control； reactive power balancing

0引言

单相级联H桥（cascadedH-bridge，CHB）变换器具有网侧电流谐波含量低、开关器件承受电压应力小、结构模块化等特点，广泛应用于中高压光伏发电与牵引传动系统[1]。（剩余10749字）