摘要
针对载波移相和载波同相层叠调制技术应用于级联H桥逆变器时分别存在的输出电压谐波性能差和输出功率不均衡的问题,对CPS-PWM技术中的三角形载波重新构造,提出了一种基于载波重构的混合多载波PWM调制技术。利用IPD-PWM技术中垂直层叠分布的小三角形的腰取代CPS-PWM中的三角形载波,通过状态空间平均法计算出在重构后的载波下逆变器输出电压的基波幅值和各个级联单元的输出电压,并和逆变器在CPS-PWM和IPD-PWM技术下的输出电压做了对比分析。以七电平CHB逆变器为例,采用混合多载波PWM调制技术时的仿真和实验结果表明:输出线电压谐波性能与采用IPD-PWM调制技术时完全一致,并且和CPS-PWM调制技术一样能提高的逆变器等效开关频率和能实现级联单元间功率自然均衡,且输出电压基波幅值也与采用IPD-PWM和CPS-PWM技术时相等。
The carrier phase shift PWM(CPS-PWM)and in-phase disposition PWM(IPD-PWM)modulation technologies are applied to cascaded H-bridge.The H-bridge(CHB)inverter has the problems of poor output voltage harmonic performance and unbalanced output power.To reconstruct the triangular carrier in CPS-PWM technology,a hybrid multi carrier PWM modulation technology based on carrier reconstruction is proposed.The triangle carrier in CPS-PWM was replaced by the waist of small triangle which was vertically stacked in IPD-PWM technology.Based on the state space average method,the fundamental amplitude of the output voltage of the inverter and the output voltage of each cascade unit under the reconstructed carrier were calculated,and compared with the output voltage of the inverter under the CPS-PWM and IPD-PWM technologies.Taking the seven-level CHB inverter as an example,the simulation and experimental results show that the harmonic performance of output line voltage is exactly the same as that of IPD-PWM,and the equivalent switching frequency of the inverter can be increased and the power between cascaded cells can be naturally balanced as that of CPS-PWM,and the fundamental amplitude of output voltage is also the same as that of IPD-PWM and CPS-PWM technology.
作者
叶满园
陈乐
康力旋
章俊飞
吴韩
YE Man-yuan;CHEN Le;KANG Li-xuan;ZHANG Jun-fei;WU Han(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2020年第10期59-68,共10页
Electric Machines and Control
基金
国家自然科学基金(51767007)
江西省工业科技支撑计划项目(20192BBEL50011)
江西省自然科学基金(20192BAB206036)。
关键词
多电平逆变器
级联H桥
混合多载波PWM
载波重构
功率均衡
谐波分析
multilevel inverter
cascaded H-bridge
hybrid multi-carrier PWM
carrier reconstruction
power balance
harmonic analysis
