摘要
对IEC推荐的闪变测量方法进行分析后发现,如果波动分量的频率和幅值已知,则瞬时闪变视感度S可以直接由其得出,本文在此基础上提出了一种新的闪变测量方法。首先使用平方检波法提取出产生闪变的波动信号,对其进行线性调频Z变换(Chirp-Z Transform,CZT)得出波动分量的幅值和频率,然后根据波动分量的幅值和频率求出瞬时闪变视感度。使用CZT进行波动分量的提取,可以在不延长采样时间的前提下获得比快速傅里叶变换(FFT)更高的频率分辨率,有效降低了频谱泄漏造成的误差。通过仿真和试验对IEC方法和本文提出的方法进行了比较,结果证明了本文所提方法的正确性和有效性。
Studying of the IEC flicker meter shows that the instantaneous flicker sensation level S can be calculated directly if the spectrums of fluctuating component of voltage are known. In this paper a novel flicker Measurement method is proposed. First, the square demodulation is used to obtain the fluctuating component of voltage, and then the Chirp-Z transform(CZT) is used to obtain the amplitude and the frequency of wave component, and final the instantaneous flicker sensation level S. To process the wave component by CZT can acquire precise spectrums without prolonging the sampling time and decrease the error produced by spectrum leakage. The IEC flicker meter and new method is compared in simulation and test. The result verified the correctness and efficiency of the theoretical prediction.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第3期209-215,共7页
Transactions of China Electrotechnical Society
作者简介
李和明 男,1956年生,教授,博士生导师,主要研究方向为电力电子与电力传动、大型发电机在线检测与故障诊断技术的研究。
康伟 男,1977年生,博士研究生,主要研究方向为电能质量监测。