IGBT串联型电压源换流器的桥臂直通机理分析

Short Circuit Mechanism Analysis of VSC Based on Series IGBTs

应用绝缘栅双极型晶体管(IGBT)串联组件是提高电力电子装置耐压最直接的方法,但将门极RCD有源均压电路应用于五段式空间矢量脉宽调制(SVPWM)的电压源换流器(VSC)时,可能会产生桥臂直通短路现象。从均压电路工作原理出发,分析IGBT均压箝位电容电压突增导致换流器桥臂直通短路的机理,并通过实验验证了该桥臂直通短路现象的存在,基于门极RCD有源均压的串联IGBT组件不宜用于五段式SVPWM的VSC中。

The application of series insulated gate bipolar transistors （IGBTs） stack is the most direct way to improve the voltage withstand of power electronics equipment, but the short circuit of voltage source converter（VSC）＇s bridge may be caused when the RCD active control circuit used in the VSC modulated by five step space vector pulse width m- odulation （SVPWM）.The short circuit mechanism of VSC is analyzed when the clamping voltage provided to the volt- age balancing processing is surged, and the existence of short circuit in VSC＇s bridge is verifid by experiment,the re- suits show that series IGBTs stack based on RCD active gate control circuit cannot be used in VSC with five step SVPWM.