基于电荷平衡的两级式逆变器前级电路控制方法  

Controller of front-end converter in two-stage inverter based on electric-charger balance theory

作　　者：袁义生[1] 周盼[1] 田纪云[1] 

机构地区：[1]华东交通大学电气学院,江西南昌330013

出　　处：《电工电能新技术》2017年第12期15-21,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金项目(51467005);江西省重点研发计划项目(20171BBE50018)

摘　　要：针对两级式逆变器传统控制中无法兼顾抑制二次纹波电流i2nd和改善中间母线电压ub动态特性的问题,提出了一种基于电荷平衡控制和传统控制相组合的方法,前者负责改善动态下ub的控制,后者负责稳态下抑制二次纹波电流i2nd的控制。分析了前级电路双环控制中符合i2nd需求下电压环的设计方法、Δub对穿越频率ωc范围的影响,以及最终对ub动态响应时间ts的影响。推导了电荷平衡控制的原理,占空比的获取,提出了一些设计关键问题的解决办法。最后在一台100V输入、200V中间母线电压、110V输出、450W负载的样机上进行了测试,比较了传统方法和所提控制方法在投载下的动态特性,显示所提方法具有响应快,波动小的优点,证明了方法的有效性。For a two-stage inverter,the traditional controller could not balance the contradiction between the secondary harmonic current i2 ndand dynamic response characteristic of the middle bus voltage ub. Then an electriccharge-balancing controller combined with the traditional double-loop controller is proposed. The new controller operates as load switching on/off. The traditional controller operates as load stable to suppress the secondary harmonic current i2 nd. Based on the traditional double-loop controller,the design of the voltage-loop controller satisfying i2 nd requirement is elaborated,including the cross frequency ωcaffected by Δuband the final dynamic response time ts of ub. The operation theory of the electric-charge-balancing controller is explained. The duty cycle and some other key design problems are induced. One prototype with 100 V input/200 V ub/110 V output/450 W load was built and tested. The experimental waveforms proved the proposed method had a better ubdynamic characteristic than that of the traditional controller and was available.

关 键 词：单相逆变器 前级电路 中间母线电压 控制方法 动态响应 

分 类 号：TM315[电气工程—电机]