重庆工商大学学报（自然科学版）2025，Vol.42Issue(3)：19-26,8.DOI:10.16055/j.issn.1672-058X.2025.0003.003
混合级联H桥逆变器的新型功率均衡调制策略
A Novel Power Balancing Modulation Strategy for Hybrid Cascaded H-Bridge Inverters
摘要
Abstract
Objective Traditional hybrid modulation strategies applied to cascaded H-bridge multilevel inverters with a DC-side voltage ratio of 1∶1∶2 have addressed issues such as current backflow but still face challenges in achieving balanced output power among individual cells.To tackle this issue,a novel modulation strategy capable of balancing output power among all cells is proposed.Methods The novel modulation strategy starts from the perspectives of mathematical calculations and switch state combinations.Through calculations,it controls the output power of the high-voltage unit to be half of the inverter's total output power.On this basis,by adjusting redundant switch state combinations,the conduction intervals of the high-voltage unit are redistributed once to meet the requirements of complete modulation.Meanwhile,pulse signals for the low-voltage cells within specific intervals require logical processing to ensure equal conduction time between the two low-voltage cells,thereby ensuring that their output powers are equal.Results Simulation and experimental results demonstrate that the novel modulation strategy not only achieves balanced output power among the three cells but also improves the quality of output voltage.Conclusion Simulation and experiments also confirm that the calculation method effectively controls the output power of the H-bridge cells,and adjustments to switch state combinations meet the requirements for modulation.These two methods,when combined,can effectively address the issue of power balancing between cascaded H-bridge units with unequal voltage ratios on the DC side.关键词
电流倒灌/功率均衡/开关状态组合/导通时间Key words
current backflow/power balancing/switch state combination/conduction time分类
动力与电气工程引用本文复制引用
王伟健,顾军,张海杰..混合级联H桥逆变器的新型功率均衡调制策略[J].重庆工商大学学报（自然科学版）,2025,42(3):19-26,8.基金项目
2023年安徽省大学生创新创业训练计划项目(202310361041). （202310361041）
