电力电容器噪声辐射比的实验测量方法研究

电力电容器是高压直流换流站中噪声源之一，如不很好地治理，它产生的噪声对社会环境会造成危害。因此，研究电容器噪声辐射比的实验测量方法，可以通过辐射比直接计算电容器的噪声，为电容器噪声估算提供依据。实验室中，电容器辐射比常用的测量方法为表面振速法。本文首先在半消声室内建立了电容器噪声辐射比的测试系统，在正弦扫频激励下，分别用表面振速法、振声频响函数法（FRF）测量电容器噪声辐射指数曲线。并在几个单频正弦激励下，根据测量的电容器不同表面噪声辐射指数曲线，计算出电容器表面噪声值，再将计算噪声值与实测噪声值进行对比，验证了振声频响函数法的准确性。

Stuty on Experimental Measurement Methods of Noise Radiation Ratio of Power Capacitor

Power capacitor is one of the noise at high voltage DC converter station, which,if not be- ing controlled effectively, will cause danger to the social environment. Therefore, the experimental measurement of capacitor radiation ratio can be studied by directly calculating the capacitor noise through the radiation ratio, to provide evidence of noise estimation of the capacitor. In the laborato- ry, the normal measurement method of radiation ratio is surface vibration velocity method. In this paper, the system testing noise radiation ratio of the capacitor is established firstly at a semi-anecho- ic room. Then, the exponent curve of noise radiation of capacitor is, under excitation of sine scan frequency, measured by surface vibration velocity and frequency response function （FRF） respec- tively. And, under sine excitation of several single frequencies, the surface noise value of capacitor is calculated according to the noise radiation exponent curve of different surfaces in the measured capacitor, the calculated noise value and actually measued one are compared and the correctness of FRF methods is verified.