直流换流阀是直流输电的核心设备，它的结构抗震性能直接影响整个直流输电系统的地震安全性。而阀结构的抗震研究是阀结构设计时考虑的重要因素之一。阀结构采用避震设计，建立阀三维有限元模型，考虑铰接处旋转刚度影响， 建立理想阀结构和改进阀结构模型，对理想模型用两种程序程。首先计算两种阀结构的动力特性，分析影响动力特性的主要因素；其次利用时程分析研究了它们在水平和竖直激励下的阀结构响应。结果表明，阀结构具有较好的避震能力，在水平地震作用下可能发生低频振荡现象，改进的阀结构改善了阀体在水平地震作用下的结构位移变形。

Thyristor valve is a key device of HVDC transmission system, the seismic performance of which can directly affect the seismic safety of the whole DC system, whilst seismic behavior can be an important factor when designing valves. Valves structure used shock absorber design. Based on considering the impact of hinged rotating stiffness, three dimensional finite element models of ideal and improved valves were constructed. Used two procedures in order to calculate the ideal model for mutual authentication their calculation results, and the seismic time history of the system was generated based on the IEEE Recommended Practice for Seismic Design of Substations. First, the dynamic character of two models were calculated. The influencing factors of their dynamic characters were discussed subsequently. Secondly, the response of them were analyzed based upon time history analysis method on horizontal and vertical excitation. The result indicates that the valves had good shock absorbers capacity, and under horizontal seismic, valves may occur oscillation phenomenon at low frequency, and also the improved valve structure model can improve displacement deformation of the valves structure.