直流断路器并联IGCT通断特性  

On-off Characteristic of Parallelly Connected IGCT in a DC Circuit Breaker

作　　者：张智辉 吴翊[1] 吴益飞[1] 杨飞[1] 易强[1] 崔艺龄 ZHANG Zhihui;WU Yi;WU Yifei;YANG Fei;YI Qiang;CUI Yiling(State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学电气工程学院电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2020年第11期3871-3878,共8页High Voltage Engineering

基　　金：国家重点研发计划(2017YFB0902400);国家自然科学基金(U1966602,51707145)。

摘　　要：电力电子组件是混合式直流断路器分断故障电流的核心部件,对于混合式直流断路器的分断性能具有重要影响。集成门极换流晶闸管(integrated gate commutated thyristor,IGCT)具有容量大、通态压降低、关断速度快、抗浪涌能力强等特点,作为电力电子组件中的核心关断器件具有广泛应用前景。为此,针对直流开断工况设计并联IGCT组件,基于理论分析和试验验证获得了不同电流上升率、压接压力、接线方式情况下并联IGCT通态均流效果的影响规律,提出了关断时并联IGCT均流的控制方法。研究结果表明:并联IGCT通态均流效果主要受器件门槛电压、斜率电阻参数的影响,且压接力越大的器件斜率电阻越小;IGCT组件采用同侧端接线方式的均流系数比异侧端大;通过控制并联IGCT的关断时序,能够改善关断过程中瞬时功率分配不均衡,提升并联IGCT组件的关断能力与可靠性。Power electronic module is the core component of a hybrid DC circuit breaker(HDCCB) to break the fault current, which has an important influence on the breaking characteristics of HDCCB. Integrated gate commutated thyristor(IGCT) has the advantages of large capacity, low on-state voltage, fast turn-off speed and strong anti-surge capability. It is widely used as a core turn-off device in power electronic modules. For this reason, a parallel IGCTs module is designed for DC breaking conditions. Based on theoretical analysis and experimental verification, the influence rules of on-state current sharing of parallel IGCTs under different current rising rates, clamping forces and wiring modes are obtained. A control method for parallel IGCTs current sharing during turning off is proposed. The results show that the on-state current sharing of the parallel IGCTs is mainly affected by the IGCT device’s parameters of threshold voltage and slope resistance. And the greater the clamping force is, the smaller the slope resistance will be. The current sharing coefficient of parallel IGCTs of wiring mode of same side is greater than that of the opposite side. By controlling the turn-off timing of the parallel IGCTs, the instantaneous power distribution imbalance during the turn-off process can be improved. The turn-off capability and reliability of module can also be improved.

关 键 词：集成门极换流晶闸管 混合式直流断路器 并联IGCT组件 缓冲电路 通态均流 

分 类 号：TM561[电气工程—电器]