非隔离光伏并网逆变系统的地电流分析与验证  

Analysis and Verification of Ground Current for Grid Connected Transformerless Photovoltaic Inverter System

作　　者：苏娜 徐德鸿[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2012年第12期30-35,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50877072)~~

摘　　要：分析了非隔离光伏并网逆变系统的地电流大小。介绍了包括单级结构的传统三相逆变器和三相半桥逆变器,以及两级结构的带2电平升压变换器的三相逆变器和带3电平升压变换器的三相逆变器。建立了地电流解析计算方法,给出了各种拓扑的共模简化模型及地电流的傅里叶表达式,以及参数变化对地电流的影响。分析了不同前级升压拓扑对地电流的影响,进行了仿真和实验。The ground current for grid connected transformerless photovoltaic inverter system is analyzed. For the single-stage structure, the traditional three phase inverter and the three phase half-bridge inverter with split capacitor are discussed. For the two-stage structure, the two-level boost converter plus threephase inverter and the three-level boost converter plus three-phase inverter are discussed. The calculation method to estimate the ground current is established. The common-mode models and the Fourier equations of the ground current are given. And the effect of different parameters on the ground current is proposed. The influence of different front-end boost converters on the ground current is analyzed. The simulation and experiment results are given to verify it.

关 键 词：光伏发电 并网逆变器 共模模型 地电流 谐波频谱 

分 类 号：TM464[电气工程—电器]