一般缓冲电路的模型及三电平IGBT变流器内外元件电压不平衡机理  

MODELING FOR GENERAL SNUBBER CIRCUITS AND THE REASON FOR VOLTAGE UNBALANCE BETWEEN THE INNER AND OUTER DEVICES IN THREE LEVEL IGBT CONVERTERS

作　　者：赵正毅[1] 魏念荣[1] 赵良炳[1] 韩英铎[1] 

机构地区：[1]清华大学电机系柔性交流输电研究所,北京100084

出　　处：《中国电机工程学报》2000年第6期30-34,共5页Proceedings of the CSEE

摘　　要：通过对斩波器中缓冲电路工作过程的分析 ,提出了一般缓冲电路的模型。根据这个模型 ,分析了中点箝位式(NPC)三电平变流器中内外绝缘栅双极型晶体管 (IGBT)电压不平衡的原因。并指出电压不平衡是由于NPC三电平的特殊结构和电路中的杂散电感造成的。实验波形证明了模型的正确性和分析的有效性。The model for general snubber circuits is presented by means of analyzing the snubber circuit of a chopper. Then the voltage unbalance between the inner and outer IGBTs of the Neutral Point Clamping(NPC) three level converter is analyzed on basis of this model. The proper reasons for the unbalance are the unique structure of NPC three level converters and the parasitic inductance in the circuit. Finally the experimental waveforms are given to demonstrate validity of the model and the analysis.

关 键 词：三电平变流器 IGBT 缓冲电路 电压不平衡 元件 

分 类 号：TM46[电气工程—电器]