±800kV特高压直流换流阀地震响应分析  

Seismic Response Analysis of ±800 kV UHVDC Converter Valves

作　　者：杨振宇[1] 谢强[1] 何畅[1] 马国梁[1] 

机构地区：[1]同济大学土木工程学院,上海市杨浦区200092

出　　处：《中国电机工程学报》2016年第7期1836-1841,共6页Proceedings of the CSEE

摘　　要：位于地震高烈度区的换流站中换流阀塔的抗震性能对换流站的安全运行有重要意义。以?800 kV特高压直流换流站的高端换流阀厅及换流阀塔为原型,采用非线性弹簧单元模拟悬吊绝缘子,建立了有限元模型进行时程响应的分析计算。结果表明,地震作用下阀塔底部水平位移响应可超过1 m,绝缘子的非线性特性使得阀塔竖向加速度响应剧烈,阀层出现"弹跳"现象。阀厅对地震波的放大作用可增大阀塔的加速度响应,但对位移响应影响有限。由于阀塔的高阶局部振型频率与阀厅基频接近,阀厅与阀塔发生共振导致阀塔顶部水平加速度响应巨大。建议采用直径更大的悬吊绝缘子以防止屈曲,并采取措施限制阀塔底部的水平位移。Seismic performance of converter valve in high seismic intensity area is significant for the safety operation of ultra high voltage direct current（UHVDC） converter substations. Based on a ？800 kV UHVDC converter station, a finite element model of the converter valve and hall was established and time history analysis of the model was carried out. Suspension insulators of valve were simulated by nonlinear springs. The results show that displacement response at the bottom of valve can reach more than 1 m. The nonlinearity of insulator makes the vertical acceleration response of valve very large and valves may bounce during earthquake. The amplification of earthquake wave by hall leads to a rise of the horizontal acceleration response of valve but has little influence on the displacement response of valve. As the frequencies of local higher modes of valve are close to natural frequency of hall, resonance between valve and hall can occur and this can trigger a huge horizontal acceleration response at the top of valve. It is suggested that larger diameter insulators should be used to prevent the buckling of insulator and extra measures should be taken to limit the displacement at the bottom of the valve.

关 键 词：±800 kV特高压直流换流阀 悬挂设备 时程分析 地震响应 放大系数 

分 类 号：TM712[电气工程—电力系统及自动化]