基于晶闸管钼层实测温度计算结温的方法

为获得较准确的晶闸管结温,提出了基于晶闸管钼层实测温度计算结温的共扼梯度算法。分析了共轭梯度法用于求解结温的具体步骤,并通过FORTRAN语言编译形成LOG命令流,导入ANSYS软件中来实现算法,该方法对于未知的低频分量,以较少的迭代次数即可以得到准确解,对于未知的高频分量,通过多次的迭代也能够获得准确的返溯值,因而具备处理多个未知量且收敛速度快的优点。以KPD3000-72型晶闸管应用于直流输电领域为例,分别在直流稳态、单波次浪涌电流和3波次浪涌电流的试验条件下进行计算,结果表明所得结温准确,为传统热阻抗法提供了校核的依据。

Thyristor Junction Temperature Estimation Based on Measured Temperature of Molybdenum Flat

A conjugate gradient method of thyristor junction temperature retrospected from measured temperature of molybdenum flat was introduced in this paper.Concrete steps of the conjugate gradient method for solving the junction temperature were analyzed and programmed successfully with ANSYS in FORTRAN.For unknown low and high frequency components,this algorithm obtains accurate solutions with less number of iterations,and gets exact retrospected temperature through multiple iterations,respectively.This method can provide high convergence speed with high accuracy,which has been proved to be more favorable in multiple variables simultaneously.Accuracy of this junction retrospected temperature has been validated by steady state,single wave and three waves surge current test conditions,taking a KPD3000-72 thyristor for instance.The retrospected junction temperature can provide verification basis for the traditional thermal impedance method.