新型七电平逆变器的功率均衡调制策略  

Power Balance Modulation Strategy for a Novel Seven-level Inverter

作　　者：郭猛 GUO Meng(School of Electrical and Information Engineering,Anhui University of Science&Technology,Anhui Huainan 232001,China)

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《重庆工商大学学报（自然科学版）》2024年第5期97-103,共7页Journal of Chongqing Technology and Business University:Natural Science Edition

摘　　要：目的 传统的同相层叠(Phase Disposition, PD)调制法在应用于级联H桥逆变器时的谐波性能较好,但存在各单元之间的输出功率不均衡问题,为解决功率不均衡问题的同时保留较好的谐波性能,提出一种改进优化的调制策略,简化了控制难度的同时,使逆变器功率均衡,输出较好的电能质量。方法 先对调制波优化,简化控制;然后对各单元的开关信号进行逻辑运算,重新分配开关信号,使各单元的开关导通时间相等。结果 对改进优化后的调制与传统PD调制仿真,证明改进优化后的调制不会改变传统PD调制的输出电压特性,可以实现各单元的功率均衡;最后对改进优化的调制进行实验验证。结论 改进优化后的调制简化了控制,保证了功率均衡,得到了较好的输出电压。Objective The traditional phase disposition(PD)modulation method has good harmonic performance when applied to cascaded H-bridge inverters,but there is an imbalance in output power between different units.To solve the problem of power imbalance while preserving better harmonic performance,an improved and optimized modulation strategy was proposed to simplify the control difficulty and at the same time,make the inverter power balanced and output a better power quality.Methods Firstly,the modulating waveform was optimized to simplify the control.Then,the switching signals of each unit were logically operated,and the switching signals were redistributed so that the switch conduction time of each unit was equal.Results Simulation of improved and optimized modulation and traditional PD modulation proved that the improved and optimized modulation will not change the output voltage characteristics of traditional PD modulation,and the power balance of each unit can be realized.Finally,experimental verification was conducted on the improved and optimized modulation.Conclusion The improved and optimized modulation simplifies the control,ensures power balance and yields a better output voltage.

关 键 词：级联H桥 调制策略 逻辑运算 功率均衡 

分 类 号：TM464[电气工程—电器]