Di Qi, Wang Wenbo, Gu Quan, Qian Long, and Jin Yun-yu
Second-order synchrosqueezing wavelet transform, Hilbert transform,power system, harmonic detection, inter-harmonic detection
The extensive application of non-linear power components makes the harmonic pollution situation of power system increasingly severe. To effectively suppress a variety of noise and accurately detect harmonic and inter-harmonic parameters, a harmonic detection method is proposed based on the second-order synchrosqueezing wavelet transform (SWT2nd) and Hilbert transform. First, the signal in the power system is decomposed into a set of intrinsic mode type (IMT) function components through SWT2nd. Then calculate instantaneous frequency and instantaneous amplitude of each IMT component through Hilbert transform. At last, calculate the least squares fitting of instantaneous amplitude and instantaneous frequency to realize the detection of harmonic and inter-harmonic from the noisy signal. The simulation results verify the feasibility and the effectiveness of the proposed method, which can effectively improve the detection accuracy of harmonic and inter-harmonic.
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