摘要
高频共模等效模型是研究非隔离型光伏并网逆变器共模电流(在非隔离型光伏并网设备中俗称"漏电流")抑制措施的重要工具。重点推导充分考虑寄生参数的非隔离型单相并网逆变器高频共模等效模型,并基于该模型归纳出消除共模电流的两条途径。其中正弦脉宽调制(sine pulse modulation,SPWM)开关方式消除漏电流的措施在单相全桥电路中的有效性通过仿真和实验手段得到验证,特别指出寄生参数对实际抑制效果的影响。分析电路参数匹配方式消除漏电流的措施在单相全桥电路中的无效性,并指出该措施可以应用在其它单相逆变器拓扑中,如半桥和二极管钳位三电平电路。
A common-mode equivalent model of the transformerless grid-connected inverter is crucial for suppression of the leakage current.In this paper,a high-frequency common-mode equivalent model with the parasitic parameters is developed firstly,and two schemes of leakage current eliminating is summarized base on the model.The validity of potential SPWM eliminating scheme for the single-phase full bridge inverter has been verified by the simulation and experimental results,and the sensitivity of conventional eliminating technique to parasitic parameter is analyzed deeply.The scheme invalidity of matching component parameters for the single-phase full bridge inverter has been demonstrated,but,this scheme is validity for other topologies,for example,half bridge and NPC three-level single-phase inverter.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第18期9-14,共6页
Proceedings of the CSEE
基金
江苏省普通高校研究生科研创新计划项目(CX08B_070Z)
江苏省自然科学基金(BK2008391)~~
关键词
并网逆变器
非隔离
共模等效电路
寄生参数
grid-connected inverter
transformerless
common mode model
parasitic parameter
