六开关非隔离型双降压光伏并网逆变器共模漏电流抑制研究  

Research on Common-mode Leakage Current Suppression for Nonisolated Dual-buck Photovoltaic Grid-connected Inverter with Six Power-switch

作　　者：潘力 李红伟[1] 代云中[1] 杜程茂 PAN Li;LI Hongwei;DAI Yunzhong;DU Chengmao(School of Electrical Engineering and Information,Southwest Petroleum University,Chengdu 610500,China;School of Electrical Engineering,Chongqing University,Chongqing 400044, China)

机构地区：[1]西南石油大学电气信息学院,四川成都610500 [2]重庆大学电气工程学院,重庆400044

出　　处：《智慧电力》2019年第2期43-48,共6页Smart Power

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB228203)~~

摘　　要：共模漏电流的抑制是非隔离型光伏并网逆变器需要解决的关键问题。双降压逆变器克服了传统桥式逆变器上下桥臂的直通问题,能够避免驱动信号死区引入的低次谐波。提出一种六开关非隔离型双降压并网逆变器拓扑,分析了其电路工作原理,并给出了其相应的半周期控制策略,使共模电压保持恒定,有效抑制了系统共模漏电流。最后通过仿真验证了所提逆变器电路结构和对共模漏电流分析的正确性。Common-mode leakage current needs to be suppressed in non-isolated photovoltaic grid-connected inverter. The dual buck full-bridge inverter has no problem with shoot-through,thus avoiding low-order harmonic in the dead time. The paper proposes a novel non-isolated dual buck grid-connected inverter topology,analyzes the principle of the circuit working,and proposes the semi-periodic control strategy that keeps the common-mode voltage constant,effectively suppressing the common-mode leakage current of the gridconnected inverter. At last,the correctness of the new inverter topology and the theoretical analysis on the common-mode leakage current is verified by simulation results.

关 键 词：光伏并网逆变器 非隔离型双降压 无桥臂直通问题 共模电压 共模漏电流 

分 类 号：TM464[电气工程—电器]