混合式直流断路器工况下IGBT过流特性的试验研究

Experimental Research on IGBT Overcurrent Characteristics Under Condition of Hybrid DC Circuit Breaker

混合式直流断路器结合了机械开关良好的静态特性与电力电子器件良好的动态性能,是目前直流断路器研发的新方向。IGBT作为代表性器件,其损坏机理对于探索电力电子器件在混合式断路器工况下的可靠性具有重要意义。针对6.3kV下断路器某特定型号IGBT的失效温度进行试验测定。根据试验结果,发现在一定条件下,IGBT可以工作在技术手册的电流安全工作区外,并可以保证可靠关断。为验证试验方法的普适性,试验过程中再次选择其他型号的器件进行试验,得到类似结论,并发现SiC材料比Si能耐受更高的温度。因此,这为短时工作的IGBT提供了一种判断依据,不仅可以提高IGBT的利用率,并且可以指导直流混合式断路器选择更加可靠并经济的电力电子器件。

Hybrid DC circuit breaker combines the good static characteristics of mechanical switches and the good dynamic performance of power electronic devices.It is a new direction of DC circuit breaker research and development. IGBT,as a representative device,its damage mechanism is of great significance for exploring the reliability of power electronic devices under the condition of hybrid circuit breaker.In this paper,the failure temperature of different types of IGBT is measured experimentally.According to the experimental results,it is found that under certain conditions,IGBT can work outside the current safe working area of the technical manual,and can ensure reliable shutdown.According to the calculation results of temperature rise of experimental objects,SiC material can withstand higher temperature than Si.Therefore,this provides a judgment basis for short-term IGBT,which can not only improve the utilization of IGBT,but also guide the selection of more reliable and economical power electronic devices for DC hybrid circuit breakers.