IGCT变流器吸收箝位电路的参数设计  

Design of Clamping Circuit Parameters for IGCT Converters

作　　者：谢路耀[1] 金新民[1] 童亦斌[1] 

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044

出　　处：《中国电机工程学报》2012年第12期67-74,共8页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划重大项目(2007BAA12B04)~~

摘　　要：近年来对风机容量的要求出现了爆发式增长,已达3~7 MW。此外,并网谐波控制、低电压过渡等风机并网标准越来越严苛。以集成门极换流晶闸管（integrated gatecommutated thyristor,IGCT）为核心的中压直驱全功率变流装置既可满足风机的大容量要求,又能灵活实现电网故障过渡、电网无功支撑等要求,成为大容量风机的最优选择。在IGCT变流器中,箝位电路的参数将直接影响器件SOA、最小脉宽与并网电流质量,是风机功率模块设计中十分重要的部分。提出一套IGCT变流器吸收箝位电路的优化设计方法,显著简化了箝位电路的设计过程。在对箝位电路换流工况进行详细分析的基础上,提出了箝位电路的等效电路。根据等效电路进行了响应分析,综合考虑箝位电路的设计原则,找到了优化参数的选取方法,从而降低了最小脉宽限制,提高了动态恢复速度。给出了设计实例,并进行了仿真与实验验证。In recent years,the power ratings of wind turbines has increased dramatically to 3~7？MW.Meanwhile,the requirements of the wind farm grid code are getting stricter in harmonic control,low voltage ride through and so on.The medium voltage full-scale converters equipped with the integrated gate commutated thyristor（IGCT） can not only manage the high power ratings,but also meet the requirements of grid fault ride-through and reactive power exchange,so it becomes the best choice for high power wind turbines.The optimal design of the clamping circuit is an important part of the design of IGCT converters,which will highly impact on the SOA,minimum pulse width and grid current quality.A novel design method of the clamping circuit in IGCT converters was proposed in this paper and the calculation process has been greatly simplified.After a detailed analysis of the clamping circuit commutating process,an equivalent circuit was presented and its response analysis was made.According to the design rule of the clamping circuit,an optimal parameter design method was introduced,which can reduce the minimum pulse width and speed up the dynamic recovery process.Finally,a design example was presented.Simulations and experiments verify the correctness and validity of the result.

关 键 词：集成门极换流晶闸管 箝位电路 吸收电路 最小脉宽 IGCT变流器 

分 类 号：TN34[电子电信—物理电子学]