±800kV换流变与网侧设备的地震响应分析

Seismic Response Analysis on ±800kV Converter Transformer and Grid-side Equipment

为探究网侧设备对±800 kV换流变地震响应的影响,以某典型换流变—套管体系为对象,建立其单体有限元模型以及考虑网侧设备连接的耦联模型。网侧套管顶部滑动连接金具采用滑动接触单元进行了模拟,计算分析了地震作用下模型前20阶模态以及套管加速度、位移、应力响应。结果表明:①特高压换流变—套管体系前20阶频率接近地震卓越周期,震中易发生类共振;②网侧设备对换流变阀侧套管地震响应无影响,但会显著放大网侧套管顶部位移响应和根部应力响应;③地震作用下,网侧套管顶部连接金具内部的相对滑移响应显著。因此,应关注升高座对套管地震响应的影响,重点关注网侧设备与换流变之间的耦联效应,控制网侧套管的位移和应力响应。

For exploring the influence of grid side equipment on the seismic response of±800 kV converter transformer,one bushing system of certain typical converter transformer is taken as an object so to set up its single finite element model and consider the coupling model of the grid side equipment.The sliding contact fitting on top of the bushing of grid side adopts sliding contact element for simulation.The first 20 modes of the model under seismic action,the acceleration,displacement and stress response of bushing are calculated and analyzed.It is shown by the result that:①Resonance is easy to occur when the first 20 orders frequencies of one bushing system of UHV converter transformer is close to the seismic preeminent period;②The grid-side equipment has no effect on seismic response of the valve side bushing of the converter transformer,but can significantly amplify the displacement response on top and the stress response of the bottom of grid-side bushing;③At seismic action,relative siding response of in the fitting on top of grid side bushing is remarkable.Therefore,attention should be paid to the influence of turret to the seismic response of bushing,especially the coupling effect between the grid side equipment and the converter transformer so to control the displacement and stress response of the grid side bushing.