特高压直流换流站滤波电容器噪声特性试验研究

Experimental Research Noise Characteristics of Filter Capacitors in UHV DC Converter Stations

在特高压直流换流站中,滤波电容器装置和无功补偿电容器装置是占地面积最大的设备,所以其发出的噪声对换流站总体噪声水平影响很大。电容器装置尺寸高、电容器数量巨大、电容塔处于高电位的这些特点决定了在外部进行噪声治理十分困难,而内部降噪需要对电容器的噪声特性进行研究。为解决此问题,对特高压直流换流站中电容器在不同电源波形作用下的噪声及其特点进行了试验研究,得到了电容器噪声特性规律和影响噪声水平的主要因素,为电容器内部降噪打下了基础。

The space demanded by filter capacitor installations and capacitor installations for reactive power compensation is bigger than that of any other equipment in UHV DC converter stations. So the noise emission of them has great effect on UHV DC converter stations. These capacitor installations with large sizes and high voltages consist of a large quantity of capacitor units. Because of these characteristics, it＇s very difficult to reduce the noise level of these capacitor installations with external passive measures. So, internal improvement is more suitable for capacitor installations noise reduction. And the noise characteristics must be studied comprehensively before modifying the structure of capacitors for noise reduction. Audible noise characteristics generated by power capacitors subjected to different waveforms are studied by experiments, and the results are analyzed for reference of noise reduction of capacitor with internal methods. U