基于能量算子和六项余弦窗频谱校正的电压闪变参数检测

风电等新能源发电并网及大量波动负荷的应用造成的电压波动与闪变已成为当前智能电网不可忽视的问题。文中通过能量算子提取电压闪变的包络信号,将闪变包络进行六项余弦窗三谱线改进FFT频谱校正,提出了基于能量算子和六项余弦窗三谱线插值的电压闪变参数检测方法,据此实现闪变参数的检测与分析。仿真实验证明:在分别含有单一调幅波调制、多频率调幅波调制、电网基波频率变动、含有谐波、间谐波和白噪声干扰时,文中的检测算法均保持较高的检测准确性,且算法实现简单、抗干扰性强,可有效实现电压闪变参数的实时在线检测。

Voltage flicker parameter detection based on energy operator and six cosine window spectral correction

Voltage fluctuation and flicker caused by grid-connected wind power generation and the application of large fluctuating loads have become a problem that can"t be ignored in smart grid. The envelope of the voltage flicker is extracted by the energy operator, and the flicker envelope is modified by the FFT spectrum of the six cosine window and three-spectral line interpolation in this paper. A voltage flicker parameter detection method based on energy operator and six cosine window three-line interpolation is proposed, and the detection and analysis of flicker parameters are realized accordingly. The simulation experiment proves that the detection algorithm of this paper maintains high detection accuracy when it contains single amplitude modulation wave modulation, multi-frequency amplitude modulation wave modulation, grid fundamental frequency variation, harmonics, interharmonics and noise interference. The algorithm is simple to implement and strong in anti-interference, and can realize real-time online detection of voltage flicker parameters effectively.