电压源换流器中IGBT串联动态均压新方法  

A Novel Method for Dynamic Voltage Balancing of IGBTs Series Connection in VSC

作　　者：郑连清[1] 罗洋[1] 陆治国[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《低压电器》2012年第7期27-31,42,共6页Low Voltage Apparatus

基　　金：青年科学基金项目(50907076);国家重点实验室自主研究资助项目(2007DA10512711205)

摘　　要：由动态电压不均衡引起的器件击穿致使串联失败是串联的关键问题。传统无源缓冲电路是以牺牲绝缘栅双极晶体管(IGBT)快速性换取电压均衡,IGBT损耗大。建立功率端与驱动端反馈的新型剩余电流动作保护器(RCD)动态均压电路替代传统无源缓冲电路,对电路的均压效果和串联IGBT开关损耗进行仿真分析。试验验证了该动态均压电路在IGBT串联运行时能很好地抑制其驱动信号不同步造成的动态电压不均衡,确保了电压源换流器的安全运行。The imbalance of dynamic voltage is a key problem of IGBTs series connection,which would cause the break down of the devices and series fail.The dynamic voltage balancing using traditional passive snubber circuits is achieved at the expense of the IGBT＇s rapidity,accompanying great loss.A novel residual current operated device（RCD） balancing circuit establishing a feedback between the power side and the drive side was presented.The effect and the switching loss of series connected IGBTs were analyzed by the simulations.The experimental results show that it can diminish the over-voltage across IGBTs dramatically which is caused by the asynchrony drive signals.It is guaranteed that the VSC including series connected IGBT can operate safely.

关 键 词：电压源换流器 绝缘栅双极晶体管 动态电压均衡 驱动信号 

分 类 号：TM461[电气工程—电器] TM464