基于弹簧—阻尼理论的海上变电站动力特性研究

Study on the dynamic characteristics of offshore substations based on spring-damping theory

近年来,随着海上风电的迅速发展,海上变电站的建设也逐渐兴起。然而,错综复杂、瞬息万变的海洋环境对变电站的安全性和稳定性提出了严峻的挑战,因此有必要加强对变电站分析和研究的重视。为了提高变电站数值模型分析的效率,研究以海上风电场变电站为中心,采用ABAQUS建立了实体土有限元模型和基于弹簧—阻尼理论的有限元模型,以模拟桩土相互作用。随后进行了模态分析、风浪流响应分析和地震响应分析研究。研究结果表明:使用两种模型进行模态分析得出的振型非常相似,频率误差小于5%。此外,在承受风和波流荷载时,两种模型得出的变电站结构响应具有显著的一致性。在地震荷载作用下,两个模型中样本点位移时程曲线的相位频率与测量数据非常接近。值得注意的是,基于弹簧—阻尼理论的模型计算出的振幅与地震波测量数据更为接近。此外,弹簧—阻尼理论方法还大大提高了计算效率。

In recent years,with the rapid development of offshore wind power,the construction of offshore substations has gradually increased.However,the complex and ever-changing marine environment poses serious challenges to the safety and stability of these substations,highlighting the need to strengthen analysis and research on substations.To improve the efficiency of numerical modeling analysis of substations,this study focuses on offshore wind farm substations and establishes solid soil finite element models and finite element models based on spring-damping theory using ABAQUS to simulate pile-soil interaction.Modal analysis,wind-wave-flow response analysis,and seismic response analysis were then conducted.The results show that the modes obtained from modal analysis using the two models are very similar,with a frequency error of less than 5%.Additionally,when subjected to wind and wave-flow loads,the structural responses of the substations obtained from the two models exhibit significant consistency.Under seismic loads,the phase frequency of the displacement time history curves of the sample points in both models is very close to the measured data.It is noteworthy that the amplitudes calculated by the model based on spring-damping theory are closer to the measured seismic wave data.Moreover,this method greatly improves computational efficiency.