新型H5桥光伏并网逆变器及其直流分量抑制的研究  

Research on a novel photovoltaic grid-connected inverter based on H5 bridge and its DC component suppression

作　　者：康家玉[1] 曹举[1] 王旭[1] 王素娥[1] Kang Jiayu;Cao Ju;Wang Xu;Wang Sue(College of Electrical and Information Engineering,Shaanxi University of Science ＆ Technology,Xi＇an 710021,China)

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《可再生能源》2018年第10期1467-1472,共6页Renewable Energy Resources

基　　金：陕西省科技厅工业攻关项目(2015GY038)

摘　　要：针对非隔离型光伏并网系统的漏电流和直流分量问题,文章设计了新型H5逆变拓扑结构,分析了结电容对共模漏电流的影响,同时采用改进型虚拟电容控制策略来抑制直流分量。在Simulink中搭建了1.5 kW的光伏并网系统模型,仿真结果表明,新型H5拓扑能够有效抑制漏电流,对直流分量的抑制能力强于传统抑制策略。According to the leakage current and the DC component problem of non-isolated PV grid-connected system, a novel H5 inverter topology is studied and the influence of the junction capacitance on the common-mode leakage current is analyzed on the basis of the working mode of this topology. An improved virtual capacitance control strategy is adopted to suppress the DC component of the new H5 topology. A 1.5 kW PV grid-connected system model is built on the Simulink simulation platform, and the new H5 topology leakage current suppression and different DC component suppression schemes are verified. The results of simulation show that the new H5 topology can not only effectively suppress the leakage current, but also the improved virtual capacitor control strategy can suppress the DC component more effectively than the traditional DC component suppression strategy.

关 键 词：漏电流 结电容 直流分量 H5拓扑 虚拟电容 

分 类 号：TK514[动力工程及工程热物理—热能工程] TM615[电气工程—电力系统及自动化]