四桥臂微网逆变器高性能并网H-∞控制研究  

High Power Quality H-∞ Control Research on Four-leg Grid-connected Inverters in Three-phase Four-wire Micro-grid

作　　者：吕志鹏[1] 罗安[1] 蒋雯倩 周柯 谢三军[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082 [2]广西电力科学研究院,广西壮族自治区南宁市530023

出　　处：《中国电机工程学报》2012年第6期1-9,共9页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB219706);中国与欧洲政府间国际合作计划项目(2010DFA61640);湖南省研究生科研创新项目(CX2011B130)~~

摘　　要：微网三相逆变器输出电压波形受电网畸变电压、负载谐波电流和直流侧电压中点平衡的共同作用,为使直流侧电压中点维持稳定,并使输出电压波形跟踪参考电压,针对一种四桥臂逆变器结构进行建模,采用H-∞控制策略构造高带宽鲁棒控制器对中线桥臂和三相桥臂进行统一控制。仿真和实验表明,在较大中线电流和电网电压畸变情况下,中线桥臂能够控制中点输入和输出电流近似相等,三相桥臂能够使输出电压维持较低的谐波畸变率,提升微网供电质量。The power quality of micro-grid inverters is affected by the grid voltage distortion,load harmonic current and the DC-side neutral point balance.In order to make the DC-side neutral voltage stable and output voltage tracking the reference,the paper modeled for four-leg inverter with the neutral leg and H-∞ control strategy was used to build high-bandwidth robust controller for the unified control of the neutral leg and the three phase leg.Simulation and experiment verify that the neutral leg can make the midpoint input current be approximately equal to the output current even when large neutral current exists and the three phase leg can guarantee the output voltage to maintain a low THD with the afferent turbulences of grid voltage and non-linear load.

关 键 词：三相四线制 直流侧中点平衡 鲁棒控制 电压控制模式 逆变器 

分 类 号：TM85[电气工程—高电压与绝缘技术]