摘要
针对传统PD调制法应用在级联H桥多电平逆变器时存在的输出功率不均衡问题,提出一种基于1/4输出周期载波循环的优化调制策略,使得逆变器各级联单元的输出功率均衡,且开关管的最高开关频率降为原来的一半,降低了开关损耗.该优化调制策略比传统PD调制需要的三角载波数量更少,调制更简单.以四单元级联H桥多电平逆变器为例进行理论分析,并通过仿真实验验证了所提方法的正确性.
In order to solve the problem of output power imbalance when traditional PD modulation method is applied to cascaded H-bridge multilevel inverter,this paper proposes an optimal modulation strategy on the basis of 1/4 output period carrier cycle,which makes the output power of all levels of inverter balanced.The maximum switching frequency of a switch tube is reduced to 1/2 compared to original,thus reducing the switching loss as a result.The optimal modulation strategy proposed in this paper requires only less triangular carriers as well as simpler modulation than traditional PD modulation.The author takes a four-unit cascaded H-bridge multilevel inverter as an example for theoretical analysis,and the correctness of the proposed method has been verified by simulation experiments.
作者
胡文华
谭光辉
章超凡
HU Wen-hua;TAN Guang-hui;ZHANG Chao-fan(School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China)
出处
《兰州理工大学学报》
CAS
北大核心
2020年第5期85-91,共7页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51567009)
江西省应用研究培育计划(20181BBE58008)。
关键词
功率均衡
级联H桥
载波循环
开关损耗
优化调制
power balance
cascaded H-bridge
carrier rotation
switching loss
optimized modulation
