换流站电容器装置振动与噪声特性分析

滤波电容器装置是换流站中噪声的主要来源之一。随着直流输电电压等级的提高、输送功率的增大,电容器装置产生的噪声逐渐受到人们的关注。本文以南网某换流站220kV滤波场中的电容器装置为研究对象,分析电容器装置上单台电容器和塔架的振动特性,并测量了滤波场周边的噪声水平,研究其与装置振动之间的关系。结果表明,电容器装置的振动是由电流的基波与谐波分量共同激励产生的,它们在频率上存在一定联系;对于单台电容器,各个面上的振动强度相差较大,其中以底面振动最强;分析噪声频谱,可知其频率分量与电容器振动频率分量相同;通过滤波场的噪声辐射方向图,可以确定电容器装置和电抗器周围的噪声辐射量最大。最后,通过以上研究结果,从减振、隔声和滤波元件布局等方面,提出一系列可行的降噪措施。

Study of Characteristics of Vibration and Noise for Capacitor Installation in Converter Station

The filter capacitor installation is one of main noise sources in converter station.With the increasing of HVDC voltage and transmission power,more and more attention is paid to the noise of capacitor installation.In this paper,the capacitor installation in the 220kV filtering field of a converter station is taken as the research object to analyze the vibration characteristics of single capacitor and capacitor stack.Through measuring the noise level around the filtering field,the relationship between the noise and vibration is studied.The results show that the vibration of capacitor installation is generated by the fundamental and harmonic current.It has great difference among the vibration intensity on each surface of single capacitor,especially,the bottom surface has the greatest vibration amplitude.The frequency spectrum of noise has the same frequency components as the vibration.With the noise radiating pattern of filtering field,it can determine that the surrounding of capacitor installation and reactor has the greatest radiation quantity.Finally,a series of noise reduction measures are proposed from vibration reduction,sound insulation and the layout of filter component through the above research results.