为提升支撑式柔性直流换流阀的抗震能力，部分设备供应商在支撑绝缘子之间增设斜拉杆绝缘子，研究斜拉杆绝缘子的布置方案及预拉力大小对换流阀整体抗震性能的影响十分必要。结合某工程换流阀，运用有限元数值仿真技术，首先开展模态分析，研究了斜拉杆绝缘子的布置方案以及预拉力值对阀塔动力特性的影响，然后分别采用振型分解反应谱法和非线性时程分析法对阀塔进行动力分析。结果表明增设斜拉杆绝缘子能显著提高换流阀阀塔基频，但斜拉杆绝缘子预拉力的大小对阀塔结构整体频率影响较小。时程法计算得到的结果普遍大于反应谱法的结果，且因其能精确模拟斜拉杆绝缘子可拉不可压的非线性特性，因此建议采用时程法开展带斜拉杆绝缘子的支柱式电气设备抗震性能研究。

In order to improve the seismic performance of the supported flexible DC converter valve, some equipment suppliers have added diagonal rod insulators between the support insulators. It is necessary to study the impact of the layout scheme and pre-tension force of the diagonal rod insulators on the overall seismic performance of the converter valve. Combined with a converter valve, finite element numerical simulation technology is used in a certain engineering project. Firstly, modal analysis is carried out to study the arrangement scheme of diagonal rod insulators and the influence of pre-tension force value on the dynamic characteristics of the valve tower. Then, the vibration mode decomposition response spectrum method and nonlinear time history analysis method are respectively used to conduct dynamic analysis of the valve tower. The results show that the addition of diagonal rod insulators can significantly increase the fundamental frequency of the converter valve tower, but the magnitude of the pre-tension force of the diagonal rod insulator has a relatively small impact on the overall frequency of the valve tower structure. The results obtained by the time history method are generally greater than those obtained by the response spectrum method. Because it can accurately simulate the nonlinear characteristic of the diagonal rod insulator which can be pulled but not compressed, it is recommended to use the time history method to study the seismic performance of pillar type electrical equipment with diagonal rod insulators.