并网逆变器并联系统的鲁棒控制与环流分析  

Robust Control and Circulating Current Analysis for Grid-Connected Parallel Inverters

作　　者：方红伟[1] 陶月 肖朝霞[2] 贺叶君 Fang Hongwei;Tao Yue;Xiao Zhaoxia;He Yejun(School of Electrical Engineering & Automation Tianjin University Tianjin 300072 China;Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin Polytechnic University Tianjin 300387 China)

机构地区：[1]天津大学电气与自动化工程学院,天津300072 [2]天津工业大学电工电能新技术天津市重点实验室,天津300387

出　　处：《电工技术学报》2017年第18期248-258,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51577124);天津市应用基础与前沿技术研究计划重点项目(15JCZDJC32100);天津市科技支撑计划项目资助(15ZCZDGX00980)

摘　　要：对应用于并网逆变器并联系统的鲁棒控制策略进行研究和设计,在分析并联系统的电路结构和环流特点的基础上,提出简单的单桥臂控制方法。采用基于H∞控制的结构奇异值μ综合方法,抑制各种不确定性的影响,使并网并联系统的稳定性和性能得到提高,实现并网电流的准确控制和环流的抑制。同时,给出系统稳定运行的不确定性范围,所设计的控制器在给定范围内能保证系统稳定运行。仿真与实验结果验证了控制方案的有效性。A robust control strategy for the grid-connected parallel inverters is developed in this paper.Based on the analysis of the circuit structure and circulating current of the parallel system,a simple single leg control method is proposed.Structured singular valueμsynthesis based on H∞control theory is applied,to decrease the impacts from various uncertainties as well as improve the stability and performance of the parallel system.As a result,the accurate current control and circulating current restraining are realized.Further,the range of the uncertainty is given for stable operation of the system,while the controller can ensure the stability in the determined range.The simulation and experimental results show the effectiveness of the proposed control scheme.

关 键 词：逆变器并联系统 并网 鲁棒控制 Μ综合 环流 

分 类 号：TM315[电气工程—电机]