非隔离型光伏并网逆变器共模干扰抑制方法研究  

Study on common-mode interference suppression method of non-isolated photovoltaic grid inverter

作　　者：薛家祥[1] 李丽妮[1] 廖天发[1] 董昌文[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《电子技术应用》2014年第8期68-71,共4页Application of Electronic Technique

基　　金：广东省教育厅产学研项目(2012B091100339;2011B090400261);广州市番禺区科技计划(2011-专-02-4.21);江门市科技计划(2011010012417)

摘　　要：非隔离型光伏并网逆变器中没有使用隔离变压器,其具有体积小、成本低、转换效率高等特性,但光伏阵列输入侧与电网输出侧存在电气连接,为共模电流提供了回路,导致易产生EMC干扰与安全隐患。分析了非隔离型光伏并网逆变器共模电流产生机理,从逆变拓扑结构出发,基于共模电流抑制技术,提出从改变调制方式和改变拓扑结构角度抑制共模电流的方法,并以实验验证了两种方法的可行性。Isolation transformer is not used in the non-isolated photovohaic grid inverter. And the inverter has the characteris- tics of small size, low cost and high conversion effieeney. But there is a direct electrical connection between photovoltaie array out- put and gird input. This electrical connection provides a circuit for common-mode current which will cause EMC interference and potential safety hazard. This paper analyzes the production mechanism of common-mode interference of non-isolated photovohaie gird inverter and puts forward the methods which is based on the rules of common-rode current by analyzing the inversion topology to inhibit the common-mode current by changing modulation mode or changing topological structure. Experimental results show the validity of the proposed method.

关 键 词：非隔离光伏并网逆变器 共模电流 共模干扰抑制 全桥逆变 H6桥逆变 

分 类 号：TM464[电气工程—电器]