高地震烈度地区悬吊式换流阀抗震性能及限位措施研究

Study on the anti-seismic properties of the suspended converter valve and displacement restraint measure in high-intensity earthquake area

悬吊式换流阀在我国西南高烈度地震区特高压输电工程中得到了广泛的应用,其抗震性能研究的重要性不言而喻。本文以滇西北至广东特高压直流输变电工程项目为背景,建立了换流阀-阀厅整体结构的三维模型,利用模态分析和时程积分法对送端换流站的悬吊换流阀的抗震性能和限位措施进行了研究。考虑自重效应的模态分析发现,换流阀-阀厅系统的低阶振型较好地避开了地震和厂房的峰值频率。在基于逐步积分法的动力时程分析中分别考虑了3条地震波(2条自然波和1条人工波)的作用,结果表明,悬吊式换流阀具有低频、大位移、低应力的动力响应特点,因而具有优越的抗震性能。为避免大位移引起相邻连接设备的损坏,本文还进一步针对悬吊式换流阀开展了限制位移措施的研究,分析结果表明:在设备底部施加弹簧拉索装置能够有效地限制换流阀在强地震作用下的位移响应。

The suspended converter valve has been widely used in ultra-high voltage direct current（UH-VDC）transmission project in Southwest China which is a high intensity seismic region,so the research on seismic performance is very important.Based on the background of the Dianxibei-Guangdong UHVDC power transmission project,a three-dimensional model of the integral structure including the converter valve and the valve hall is established in this paper;both modal analysis and time integration method have been used to study the seismic performance and displacement limit measures on the converter valve of the sending end.The results of modal analysis considering the weight effect show that the low order vibration mode of the converter valve-hall system can avoid the peak frequency of the earthquake and the valve hall structure.Three seismic waves（two natural waves and one artificial wave）are considered in the step-by-step dynamic time history analysis,whose results also show that the suspended valve has the characteristics of low frequency,large displacement and low stress,so it has superior seismic performance.In order to avoid the damage of adjacent connection device caused by large displacement of the suspended valve,measure of limiting displacement of the suspended valve is also studied in this paper,and results show that applying spring cable device at the bottom of the valve can effectively limit the displacement of valve under strong earthquake.