特高压直流换流阀地震响应试验研究

Experimental research on seismic response of UHVDC converter valves

换流阀是特高压直流输电工程中换流阀厅内的关键设备,其在阀厅内的抗震性能直接影响到阀塔的设计及电力生命线工程的安全。基于缩比理论,建立1:3的换流阀缩比模型,开展地震台振动试验,研究阀塔的最大摆幅、受力以及运动状态等。试验结果表明:地震作用下,阀厅对阀塔存在动力放大效应,各层阀塔间加速度变化不大;悬吊绝缘子中间截面受力小于两端截面,存在弯曲及扭转效应,并非严格意义上的二力杆;阀塔底部摆副最大,顶部加速度最大,且各层运动状态不一样,这些均需在工程设计中重点考虑。缩比模型试验对特高压换流阀工程设计及分析具有一定的指导意义。

Thyristor valve is the key device in valves hall of HVDC transmission system,since the aseismic performance of thyristor valve can directly affect the design of valves and the seismic safety of the whole system.Based on the reduced-scale theory,a 1/3 reduced-scale model of converter valve and hall was established and the earthquake shaking table test was carried out.Experimental results show that under the earthquakes,the valve hall has a dynamic amplification effect on the valve tower,and there is little difference in acceleration between the valve towers of each layer.Then the strain of the middle section is smaller than that of the top and bottom sections,which indicates that the suspension insulator is not a two-force bar and torsion and bending effect should be concerned.The maximum swing occurs at the lowest end of the valve tower,and the maximum acceleration occurs at the top suspension points.Several simulation results can be obtained by this model and further analysis of the real valve tower could be carried out.