IGCT变流器箝位电路分析及参数设计

Analysis and Parameters Design of Clamping Circuit for IGCT Converters

集成门极换流晶闸管(integrated gate commutated thyristor,IGCT)广泛应用于高电压、大电流的大容量变流器,运行特性受电路元件参数及运行状况等多方面制约。根据IGCT基本电路单元,在深入分析箝位电路工作原理的基础上,考虑电路杂散电感对电路参数设计的影响,结合理论与实验分析所得限制条件,提出基于fmincon函数优化非线性不等式约束问题准确且完善的箝位电路参数设计方法,显著简化了箝位电路参数优化设计过程,确保IGCT的安全运行。结合设计实例,通过优化设计值、仿真分析与实验结果的对比,验证参数设计及分析方法的有效性,并通过实验分析及与现有方法的对比,证明该文方法的优越性。

Integrated gate commutated thyristors （IGCTs） are widely used in the high voltage and large current＇s large-capacity converters and its running characteristics are restricted by many factors including circuit elements＇ parameters and the running state. According to the basic circuit unit of IGCT converter, an accurate and improved design method of clamping circuit parameters using function fmincon to optimize nonlinear inequality constrained problem was proposed on the basis of deeply analyzing clamping circuit working principle, considering the impact of circuit stray inductance on the parameter design, and combining with the constraints from theoretical and experimental analysis, which significantly simplified the optimal design process of clamping circuit parameters and ensured the safe operation of IGCT. Combined with the practical example, the validity of the parameter design and analysis methods was verified through comparing the optimized values with the simulation analysis and experimental results, and the advantage of the method was proved through the experimental analysis and the comparison with the existing method.