基于统一离散时域建模法的晶闸管串联运行暂态仿真

现有晶闸管仿真模型虽能较准确地模拟单只晶闸管开通和关断的动态过程，却较少涉及多只器件的串并联仿真。文中在分析晶闸管开关过程中动态特性的基础上，利用统一离散时域建模法建立了包含开关动态过程的晶闸管数学模型。由于该模型采用时变电阻来描述晶闸管工作过程中电压、电流的变化关系，因此适用于晶闸管串联电路的暂态仿真分析。仿真和实验结果表明所建立的晶闸管数学模型可较为准确地描述串联运行的晶闸管开关过程中电压的动态分配，从而为需晶闸管串联运行的大型电力电子装置的动静态均压电路设计提供了依据。

CASCADED THYRISTORS SIMULATION BASED ON UNIFIED DISCRETE TIME-DOMAIN MODELING

The forward and reverse recovery process of the single thyristor can be exactly simulated using the existing models, but the simulation of the cascaded thyristors is seldom, if ever, involved. Based on an analysis of the dynamic performance of the thyristor switching process, a thyristor modei including the transient process is developed with the unified discrete time domain modeling in this paper. As this modei adopts time-variable resistance for describing the variable relation between voltage and current, it is suitable for series thyristor circuit simulation. The simulation and experimental results show that the voltage distribution in the transient process of the cascaded thyristors operation can be accurately described. Therefore, it can provide a basis for the design of large power electronic devices that require thyristors operating in series.