Harmonic and Interharmonic Measurement Method Using Two-Fold Compound Convolution Windows and Zoom Fast Fourier Transform

Xiangui Xiao (), Lei Zhao, Shengjun Zhou, Haijun Liu, Zhong Fu and Dan Hu
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Xiangui Xiao: China Electric Power Research Institute Co., Ltd., Beijing 100053, China
Lei Zhao: China Electric Power Research Institute Co., Ltd., Beijing 100053, China
Shengjun Zhou: China Electric Power Research Institute Co., Ltd., Beijing 100053, China
Haijun Liu: China Electric Power Research Institute Co., Ltd., Beijing 100053, China
Zhong Fu: State Grid Anhui Electric Power Research Institute, Hefei 230022, China
Dan Hu: State Grid Anhui Electric Power Research Institute, Hefei 230022, China

Energies, 2025, vol. 18, issue 15, 1-16

Abstract: With the rapidly increasing penetration of new energy resources, the power grid faces significant threats from harmonics. To measure and suppress these harmonics, numerous harmonic measurement methods have been proposed. However, accurately identifying the parameters of harmonics and interharmonics remains challenging. To address this issue, we propose a new method that combines two-fold convolution windows and ZoomFFT. This method leverages the advantages of low side lobe peaks and high side lobe attenuation rates of compound convolution windows to suppress spectral leakage. Additionally, a six-spectral-line interpolation method is employed to correct the calculation results. Furthermore, ZoomFFT is utilized to locally amplify the spectrum, enabling the distinction between interharmonics and harmonics with closely spaced frequencies. The simulation results demonstrate that the proposed algorithm effectively identifies interharmonics with similar frequencies, outperforming single-window functions and ZoomFFT in terms of accuracy.

Keywords: compound convolution windows; six-line interpolation algorithm; harmonic; interharmonic; ZoomFFT (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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