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针对电能质量分析的现状,采用一种高分辨率的时频分析方法对谐波进行分析。该方法通过对时频平面内每一点计算模糊函数,获得时频最优核函数,并以此来抑制同时间点多分量信号引起的交叉项干扰,从而获得较高的时频分辨率。仿真结果表明,将该方法结合快速傅里叶变换检测谐波幅值,能够准确地检测出谐波各频率分量的时频分布特性和幅值大小。
In view of the status quo of power quality analysis, a high-resolution time-frequency analysis method is used to analyze the harmonics. In this method, the fuzzy function is calculated for each point in the time-frequency plane, and the optimal time-frequency kernel function is obtained, thereby suppressing the crosstalk interference caused by the multi-component signal at the same time point, thereby obtaining a higher time-frequency resolution. The simulation results show that this method combined with Fast Fourier Transform to detect the harmonic amplitude can accurately detect the time-frequency distribution characteristics and the magnitude of the harmonic components.