能量算子快速和实时提取闪变波动信号优势突出,但易受噪声影响,制约了信号解调精度.该文深入研究能量算子的解调特性,为减小由噪声干扰引起的测量误差,建立基于改进k值能量算子的闪变包络信号的快速、准确提取方法,再将包络参数进行Rife-Vincent窗改进Chirp-Z变换谱分析与校正,提出并建立基于改进k值能量算子改进Chirp-Z变换的闪变包络参数提取算法.仿真与实验结果表明,所提算法能有效克服单一调制频率变化、多调制频率闪变信号、电网基波频率变动、谐波和间谐波以及白噪声对检测结果的影响,该方法对于噪声干扰下的闪变参数检测有更高的准确度.%The outstanding advantage of energy operator is the quick and real-time extraction of flicker fluctuation signal, but it can be easily affected by noise, which restricts the signal demodulation accuracy. In order to reduce the error of measurement caused by noise, the demodulation characteristics of energy operators were studied, the method of rapid and accurate extraction of flicker envelope signal based on improvedk-value energy operator was established. The envelope parameters errors were analyzed and corrected based on Rife-Vincent window improved Chirp-Ztransform spectrum. Voltage flicker measurement algorithm using improved k-value energy operator based on improved Chirp-Z transform spectral correction was proposed and established. The simulation results show that the influences on voltage flicker measurement which are caused by the frequency of modulating waveform in change, multi-frequency of modulating waveform, the fundamental grid frequency fluctuations, harmonics and inter-harmonics and white noise, are all overcome by using this approach. The detection of flicker parameter under the noise interference has a higher accuracy in this paper.
展开▼
