抑制漏电流的非隔离电流型光伏并网逆变器  

A transformerless current source photovoltaic grid-connected inverter for leakage current suppression

作　　者：唐圣学[1,2] 宋声远 姚芳[1,2] Tang Shengxue;Song Shengyuan;Yao Fang(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,School of Electrical Engineering,Hebei University of Technology,Tianjin 300130,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province,School of Electrical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学电气工程学院),天津300130 [2]河北省电磁场与电器可靠性重点实验室(河北工业大学电气工程学院),天津300130

出　　处：《电测与仪表》2021年第1期54-61,共8页Electrical Measurement & Instrumentation

基　　金：河北省自然科学基金面上项目(E2019202481);河北省自然科学重点基金项目(E2017202284)。

摘　　要：针对非隔离光伏发电并网系统的漏电流问题,提出了一种直流母线开关对称的非隔离电流型光伏并网逆变器。给出了逆变器主电路拓扑结构和开关组态,通过建立光伏电池寄生电容的共模等效电路模型,分析了漏电流的产生和抑制机理。根据开关组态和抑制机理,设计了相应的单极性双载波调制策略和准PR控制策略。仿真和实验结果表明,所提变流器具有良好的漏电流抑制能力。Aiming at the leakage current problem in the transformerless photovoltaic grid-connected system,a symmetric DC bus switch transformerless current source photovoltaic inverter is proposed in this paper.The topology and switch configurations of main circuit of the inverter are given in this paper,and then,generation and suppression mechanism of the leakage current are analyzed by establishing common-mode equivalent circuit model of the parasitic capacitance of the photovoltaic modules.According to the switch configurations and the suppression mechanism,the corresponding unipolar dual-carrier modulation strategy and quasi-PR control strategy are designed.Simulation and experimental results show that the proposed converter has good leakage current suppression capability.

关 键 词：光伏 电流型逆变器 漏电流 抑制 

分 类 号：TM46[电气工程—电器]