同步调相机辅机系统管道振动分析

Pipeline Vibration Analysis of Synchronous Condenser Auxiliary System

本文针对特高压电网换流站调相机在役管道,建立了管道支吊架系统的有限元模型,仿真计算了各种不同管径、壁厚、支吊架布置的管道固有频率和振动型态,并通过现场振动测试得到了管道的激振频率和振动峰值。结果表明,固有频率避开调相机转子频率的管道运行平稳,振动幅值较低;固有频率与调相机转子频率相近的管道发生了共振,振动幅值远超过标准规定,具有极大的安全风险。据此提出通过调整刚度和阻尼的方法改变管道固有频率,消除管道系统的振动。

In this paper,a finite element model of the pipeline support and hanger system was developed for the operational pipeline of the synchronous condenser in the UHV converter station.The model simulated and calculated the inherent frequency and vibration mode of pipelines with varying diameters,wall thicknesses and support and hanger arrangements.Field vibration tests were conducted to determine the excitation frequency and peak vibration of the pipelines.The findings demonstrate that pipelines with inherent frequencies avoiding the rotor frequency of the converter station operate smoothly with lower vibration levels.However,pipelines with inherent frequencies close to the synchronous condenser rotor frequency has experienced resonance,leading to vibration amplitudes that significantly exceed standard regulations and pose substantial safety risks.As a solution,it is suggested to adjust the stiffness and damping of the pipeline to modify its natural frequency and eliminate vibration in the pipeline system.