±800kV特高压直流滤波电容器抗震性能分析

摘要

In order to evaluate and optimize the seismic performance of ± 800 kV UHVDC filter capacitor,a elaborate nolinear finite element model(FEM) is established and the seismic responses of filter capacitor is obtained from time history computing method.Aiming at a ± 800 kV UHVDC filter capacitor,it is found that UHV filter capacitor has strong non-linearity and low frequencies and it generates large displacement responses under earthquakes.In addition,the safety factor of hanger insulators for fortification earthquakes doesn't meet the requirements of relevant codes.Through the analysis on the coefficients of the pretension force and installation angles of bottom insulators.It is concluded that the displacement responses can be reduced by increasing the pretension force in insulators and the maximum axial force of filter capacitor can be adjusted by optimizing the installation angles of bottom insulators,the DC filter can meet the seismic requirements when the installation angle is set as 80 °,the pretension force is set as 40 kN after the specified tension load for hanger insulators is no less than 536 kN.%为评估±800 kV特高压直流滤波电容器抗震性能并对其进行抗震优化,本文建立了特高压直流滤波电容器的精细化非线性有限元模型,利用时程计算方法获得了滤波电容器在地震下的响应.针对某±800 kV特高压直流滤波电容器,计算发现其在地震作用下具有较强的非线性,结构频率低,位移较大且在设防地震下悬吊绝缘子强度安全系数不满足相关规范要求.通过对底层绝缘子预张拉力及张拉角度进行参数分析,发现增大预张拉力可以减小结构位移响应;增大底层绝缘子张拉放脚可以减小滤波电容器的轴力响应.当底层绝缘子张拉角度为80°,预张拉力为40 kN时,采用额定拉伸荷载不小于536 kN的悬吊绝缘子,可使该型滤波电容器满足设防地震要求.