高压直流断路器中的IGCT功能性模型仿真研究

Simulation Study on IGBT Functional Model in HVDC Circuit Breaker

高压直流断路器在柔性直流输电系统中起着至关重要的作用,其中集成门级换流晶闸管(Integrated gate commutated thyristors,IGCT)是保障高压断路器正常分断的关键器件之一。因此,研究IGCT开通和关断时的电压电流暂态特性模型,是高压断路器系统研究中的一个重要内容。对PSCAD中的自带IGCT模型进行了二次开发,建立一种IGCT开、断暂态的功能性模型。首先,采用电气等效、曲线拟合的方法,实现电路仿真中IGCT的不同运行状态。其次,在PSCAD中用所提出的模型搭建了仿真测试电路,并与器件手册进行对比分析。最后,将该模型嵌入到组合式直流断路器中进行仿真验证。仿真结果验证了IGCT功能性模型的有效性与正确性,为进一步研究高压断路器中半导体模块的应力分析打下了基础,具有较高的工程价值和研究意义。

HVDC circuit breakers play a vital role in the flexible DC transmission system,among which integrated gate commutated thyristors(IGCT)is one of the key devices to ensure the normal breaking of high-voltage circuit breakers.Therefore,the study of voltage and current transient characteristics model when IGCT is turned on and off is an important content in the research of high-voltage circuit breaker system.The inherent IGCT model in PSCAD is redeveloped,and a functional model of IGCT switching off and switching off transient is established.First of all,the method of electrical equivalence and curve fitting is used to realize the different operation states of IGCT in circuit simulation.Secondly,the simulation test circuit is built in PSCAD with the proposed model and the simulation calculation under different current levels is carried out.Finally,the model is embedded into the combined DC circuit breaker respectively for simulation verification.The simulation results verify the effectiveness and correctness of the IGCT functional model,which lays the foundation for further research on the stress analysis of the semiconductor module in the high-voltage circuit breaker,and has high engineering value and research significance.