交流滤波电容器振动噪声特性及声场控制研究  

Study on Vibration and Noise Characteristics of AC Filter Capacitor and Acoustic Field Control

作　　者：师愉航 李金宇[1] 汲胜昌[1] 祝令瑜[1] 崔瀚焘 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《电力电容器与无功补偿》2017年第1期65-70,共6页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金(51377130;51507128)

摘　　要：在高电压、大容量的直流输电系统中,交流滤波电容器装置为换流站可听噪声的主要来源之一。本文搭建了一套基于激光测振仪的电容器外壳振动测量试验系统,分别测量了单一频率和多频率合成激励下的电容器外壳振动形态。然后研究了电容器振动噪声特性,得到了不同频率的声辐射效率和各面声贡献量。最后提出了整个电容器装置可听噪声的控制措施。根据电容器声源的相干性及相控阵技术,按照声场聚焦距离和电容器间距要求,提出了改变电容器纵向布置的计算公式。基于试验数据,使用边界元方法(BEM),建立了不同布置方式电容器装置的噪声计算仿真模型,研究表明:电容器底面振动能量远大于侧面,宽侧面振动略大于窄侧面。相控阵布置方式能够在特定区域内降低整个装置的可听噪声水平。In high voltage and large capacity DC transmission system,the AC filter capacitor device becomes one of the main sources of audible noise in convertor stations. A set of capacitor shell vibration measurement test system based on laser Doppler vibrometer is set up. The vibration forms of the capacitor shell under the single-frequency and multi-frequency are measured.Then,the vibration and noise characteristics of AC filter capacitor is studied. Abtained the acoustic radiation efficiency at different frequencies and acoustic contribution of each surface. Noise control measures of capacitor device are studied at last. According to the coherence of acoustic source of capacitor,phased array technology the acoustic field focusing distance and capacitor spacing requirements,the formula for the longitudinal layout of the capacitor is presented. Based on the experimental data,different arrangement manner of capacitor device noise simulation model is established and sound levels are calculated using the boundary element method（BEM）. The results show that： the capacitor bottom surface vibration energy is much larger than the side,and the wide side vibration amplitude is slightly larger than the narrow side. Phased array arrangement could reduce the audible noise level of the whole device in a specific area.

关 键 词：交流滤波电容器 噪声 振动形态 仿真 噪声控制 

分 类 号：TM53[电气工程—电器]