摘要
在非隔离的光伏并网发电系统中,抑制漏电流是需要解决的关键问题之一。研究了一种改进型H6拓扑结构,通过引入一组开关管和分压电容实现变换器续流阶段时电位的可靠箝位,可消除高频脉动下的共模电压;同时在续流阶段电流不流经性能较差的MOSFET寄生体二极管,降低系统开关损耗。在分析新型H6拓扑结构的工作原理及脉宽调制(PWM)策略基础上,设计构造了3 kW光伏并网实验样机,结果表明该拓扑结构具有低损耗、高质量、消除共模电流的特征。
For uninsulated photovoltatic grid-connected power generation system, the suppression of leakge current is one of the key technologie.A new transformerless single-phase photovohaic inverter with six IGBTs is introduced, in which a set of assistant switches and voltage dividing capacitor are needed to achieve the converter stage of afterflow potential reliable clamping, to eliminate the common mode voltage under high frequency pulse, while current dose not pass through the parasitic diode of poor performance of MOSFET in the freewheeling to reduce the switching loss of system. Based on the analysis of the working principle and pulse width modulation （PWM） of new H6 topological structure, a 3 kW photovohaic prototype is designed which verify that this new inverter features low loss, high quality and eliminate the common mode current.
出处
《电力电子技术》
CSCD
北大核心
2015年第6期80-82,共3页
Power Electronics
基金
国家自然科学基金(51407084)~~
关键词
逆变器
光伏并网
非隔离
共模电流
inverter
photovoltaic grid-connected
uninsulated
common mode current
