高压IGBT串联均压控制电路阈值电压设计方法  

Active Clamping Circuit Threshold Voltage Design for Series-connected HVIGBTs

作　　者：于华龙[1] 鲁挺[1] 姬世奇[1] 袁立强[1] 赵争鸣[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2016年第5期1357-1365,共9页Proceedings of the CSEE

摘　　要：绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)器件具有耐压高、开关速度快、易驱动等优点,在电力电子变换器中应用广泛。然而目前单个IGBT器件的电压等级与容量不能满足大容量变换器的需求。应用高压IGBT串联技术是提升电力电子变换器电压等级与容量的一种有效方法。高压IGBT串联技术的关键问题是保证瞬态过程中的电压均衡。门极均压控制电路可以有效抑制串联IGBT的瞬态电压不均衡。该文介绍了一种门极均压控制电路的工作原理,综合考虑开关瞬态过程中换流回路杂散参数与续流二极管正向恢复特性的影响,提出了该电路的关键参数阈值电压的设计方法,可应用于多电平、多管串联的电力电子变换器系统中,并通过实验对该设计方法的实用性进行了验证。Insulated gate bipolar transistor （IGBT） devices are widely used in power electronics converter system because of the advantages of high rated voltage, high switching speed and easy to drive. But a single high-voltage IGBT module cannot meet the requirement of high power converter at present. The series-connected IGBTs technology is an effective way to improve the converter system voltage and capacity. The voltage balance during switching transient process is the key issue of the series-connected IGBTs technology. The active clamping circuit can effectively suppress the voltage imbalance of the series-connected IGBTs. An active clamping circuit operating principle was introduced. The threshold voltage design method was proposed by considering the stray inductances of current commutation loops and the fly-wheel diode （FWD） forward recovery characteristics, which could be applied in multi-level multi-device series converter systems. And the practicability of this method was proved by experiment results.

关 键 词：均压控制电路 高压IGBT 串联 阈值电压 电压平衡 

分 类 号：TM464[电气工程—电器]