基于模型降阶法的瞬态计算-电气时代.DOC

晶闸管组件瞬态温度场的快速计算 丁杰1, 2；张平1 (1. 湘潭大学 土木工程与力学学院 湘潭 411105； 2. 株洲南车时代电气股份有限公司 技术中心 株洲 412001) 摘 要：准确计算晶闸管组件的瞬态温度场对提高器件应用的可靠性具有重要意义。为此，讨论了现有晶闸管瞬态热分析和建模方法的特点，提出了一种计算效率和准确性高的方法：首先基于有限体积法进行精细网格的稳态计算，获取散热器的对流换热系数分布，然后将其映射到粗糙网格的有限元模型并提取热传导矩阵和热容矩阵，最后对基于Krylov子空间法的降阶模型进行快速瞬态计算。通过开发的程序快速计算多种复杂工况下的瞬态温度场，得到了最高温度变化曲线。计算结果表明网格数量的直接减少可大幅度减少计算资源与时间，对流换热系数插值可以保证边界条件的一致性，模型降阶方法可以在保证计算精度基础上提高计算效率。所述方法可为晶闸管组件的热设计提供理论依据。 晶闸管组件；瞬态温度场；模型降阶；对流换热系数；插值 中图分类号：TM461.4Fast Calculation of Transient Temperature Field for Thyristor Module Ding Jie1, 2 Zhang Ping1 (1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, Hunan, 411105, China; 2. Technology Center, Zhuzhou CSR Times Electric Co., Ltd., Zhuzhou, Hunan, 412001, China) Abstract: Accurate calculation of transient temperature field for thyristor module is meaningful to improve the reliability of the device application. Therefore, the characteristics of transient thermal analysis and modeling method of the thyristor are discussed, a novel method for calculating efficiency and accuracy is proposed. First, steady state calculation of fine grid model is carried out based on finite volume method, and then the convective heat transfer coefficient distribution of radiator is obtained. Second, the convective heat transfer coefficient distribution of fine grid model is interpolated into the finite element model with coarse grid, and then the thermal conduction matrix and thermal capacity matrix are extracted from the finite element model. Finally, the reduced order model based on the Krylov subspace method is adopted for fast transient calculation. The highest temperature change curves are obtained according to the fast calculation of transient temperature field for variety complex conditions by developed program. The calculation results show that the grid number of direct reduction can greatly decrease the computing resource and time, the consistency of boundary condition can be guaranteed by the interpolation of convect