【摘要】 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。而阀结构的抗震性能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,且对理想模型用两种程序计算。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。更多还原

【Abstract】 Thyristor valve is a key device of HVDC transmission system,its aseismic performance can directly affect the seismic safety of a whole DC system,its aseismic behavior is an important factor when designing valves.Valves’ structure adopted shock absorber design.Considering impact of rotating stiffness in hinged place,three-dimensional finite element models of ideal valves and improved ones were constructed.Two procedures were used to calculate the ideal model.Firstly,the dynamic characteristics of the two models were calculated.The influence factors on their dynamic characters were discussed subsequently.Secondly,the response of them were analyzed with the time history analysis method under horizontal and vertical excitations.The results indicated that the valves have good anti-shock capacity;under horizontal earthquake,the valves may occur oscillation phenomena with lower frequencies;the improved valve structure can improve displacement deformation of the valves’ body.更多还原