级联H桥整流器输出电压平衡模糊PI控制策略  

Fuzzy PI Control Strategy for Output Voltage Balance of Cascaded H-bridge Rectifier

作　　者：袁义生 陈旭 兰梦罗 YUAN Yisheng;CHEN Xu;LAN Mengluo(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《电力系统及其自动化学报》2020年第11期116-122,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51467005);江西省自然科学基金资助项目(20181BAB206033)。

摘　　要：针对级联H桥整流器输出电压平衡问题,在传统比例式脉冲补偿电压平衡策略的基础上引入了模糊控制技术,提出了基于模糊自适应PI控制的级联H桥整流器输出电压平衡策略,并对所提策略进行了建模分析,给出了模糊控制器的设计方法。所提策略在整体双闭环控制的基础上,通过电压平衡模糊控制计算出各级的占空比补偿量,进而实现各级输出电压的平衡。最后,利用搭建的3级级联H桥整流器的仿真模型和实验样机对传统策略和所提策略分别进行了测试,测试结果表明所提策略能够有效地减小级联H桥整流器大范围切载时各级输出电压间的最大不平衡电压,证明了所提策略的正确性和可行性。Aimed at the problem of output voltage balance in a cascaded H-bridge rectifier(CHBR),the fuzzy control technology is introduced on the basis of the traditional proportional pulse compensation voltage balance strategy,and an output voltage balance strategy for the CHBR based on fuzzy adaptive PI control is proposed.In addition,the proposed strategy is modeled and analyzed,and a design method for the fuzzy controller is given.Based on the overall double closed-loop control,the proposed strategy calculates the duty cycle compensation amount at each stage through the volt⁃age balance fuzzy control,thus achieving the output voltage balance at each stage.Finally,the traditional and the proposed strategy were tested respectively on a simulation model of the three-stage CHBR as well as on its experimental proto⁃type.Test results show that the proposed strategy can effectively reduce the maximum unbalanced voltage between the output voltages of the CHBR at each stage when load was cut in a wide range,which proves its correctness and feasibility.

关 键 词：级联H桥整流器 输出电压平衡 模糊自适应PI控制 比例式脉冲补偿 最大不平衡电压 

分 类 号：TM46[电气工程—电器]