高电压技术2012，Vol.38Issue(2)：505-512,8.
H桥级联型整流器直流电压平衡控制改进算法
Improved DC-link Voltage Balancing Method for Cascaded H-bridge Rectifier
摘要
Abstract
It is a challenge to balance the DC-link voltages of cascaded H-bridge rectifier（CHBR）.We put forward an improved PI-based control method.Firstly,we establish a mathematics model of CHBR and introduce a PI-based DC-voltages balancing method.Then,we adopt the phasorial diagram method to discover and analyze the intrinsic reason that CHBR can not work on no-load condition with this control scheme.Based on the analysis results,measures are taken in control scheme to make the phases of all the cells＇ AC side voltage equal,which guarantees stability of system when the CHBR works on the no-load condition.The improved method can regulate the cell＇s voltages well,either the reference voltages are the same or different.Furthermore,it can easily extend to the CHBR with more cells,and is testified by a 4-cell CHBR simulation results.A 2-cell CHBR prototype is built in the laboratory.Accordingly,comparison experiments by the referred control method are done.The experimental results indicate the feasibility of the presented method and good performance on the no-load condition with the improved control scheme.关键词
高压大容量/功率变换器/H桥级联/整流器/电压平衡控制算法/空载运行Key words
high-voltage high-power/power converter/cascaded H-bridge/rectifier/voltage balance method/no-load operation分类
信息技术与安全科学引用本文复制引用
陶兴华,李永东,宋义超,石磊..H桥级联型整流器直流电压平衡控制改进算法[J].高电压技术,2012,38(2):505-512,8.基金项目
国家重点实验室项目（SKLD08M03）~~ （）
