Hybrid Modulation and Power Balance Method for a Hybrid Cascaded H-bridge

HU Wenhua; ZHANG Chaofan; LIU Jianfeng

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Hybrid Modulation and Power Balance Method for a Hybrid Cascaded H-bridge

更新时间：2025-12-08

- Hybrid Modulation and Power Balance Method for a Hybrid Cascaded H-bridge
- Vol. 46, Issue 10, Pages: 3561-3568(2020)
- 作者机构：
  
  华东交通大学电气与自动化工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2020，
  
  Published：2020
- 稿件说明：
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HU Wenhua, ZHANG Chaofan, LIU Jianfeng. Hybrid Modulation and Power Balance Method for a Hybrid Cascaded H-bridge[J]. 2020, 46(10): 3561-3568.
DOI：

HU Wenhua, ZHANG Chaofan, LIU Jianfeng. Hybrid Modulation and Power Balance Method for a Hybrid Cascaded H-bridge[J]. 2020, 46(10): 3561-3568. DOI：

摘要

直流侧电压比为1:2的混合级联H桥7电平逆变器在混合调制中存在低压单元直流侧电流倒灌问题

混合频率调制虽可有效解决此问题

但降低了输出电能质量。LS-PWM倍频调制提高了高压单元的等效输出开关频率

改善了输出电压波形质量

但高压单元在某些区段仍工作在高频状态

损耗增加。针对以上问题

提出了一种电压比为1:1:2:2的混合级联H桥13电平逆变器拓扑结构和一种融合阶梯波调制与载波层叠调制的混合调制方法。不仅解决了电流倒灌问题

而且保证高压单元工作在基波频率状态。并且采用1/4输出电压周期循环交换开关管驱动信号的方法解决了相同电压等级单元之间的功率平衡问题。仿真分析及实验结果证明了理论分析的正确性及可行性。

Abstract

The hybrid cascaded H-bridge seven-level inverter with a voltage ratio of 1:2 has a DC-side current sinking problem in the hybrid modulation. The mixed-frequency modulation can effectively solve this problem

but can lead to decrease in the output power quality. The LS-PWM frequency doubling modulation can improve the equivalent output switching frequency of the high voltage unit and improve the output voltage waveform quality

however

the high voltage unit will still operate in a high frequency state in some sections

increasing the switch losses. To solve the above problems

a hybrid cascaded H-bridge thirteen-level inverter topology with a voltage ratio of 1:1:2:2 and a hybrid modulation method in combination with stepped wave modulation and carrier-stack modulation are proposed. Thereby

not only the current backflow problem is solved

but also the high voltage unit is ensured to be in operation in the fundamental frequency state. And the method of cyclically exchanging the driving signal of switching tube by using 1/4 output voltage cycle can be adopted to solve the power balance problem between the same voltage level units. The simulation analysis and experimental results prove the correctness and feasibility of the theoretical analysis.

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