• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

ELECTRIC POWER CONSTRUCTION ›› 2015, Vol. 36 ›› Issue (3): 71-76.doi: 10.3969/j.issn.1000-7229.2015.03.012

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An Detection Method for Power Harmonic Based on Wavelet Packet Transform

LUO Guanshan1, LU Huihui2, SU Chengyue2, HE Rongli2, CHEN Yuandian2   

  1. 1. Measuring Center of Guangzhou Power Supply Bureau Co., Ltd., Guangzhou 510730, China; 2. Guangdong University of
    Technology, Guangzhou 510006, China
  • Online:2015-03-01

Abstract:

As the nonlinear load increases, a large number of harmonic will back to fill the grid which may result in the power pollution and measuring inequality. However, the traditional fast Fourier transform (FFT) detection methods are difficult to meet the harmonic detection requirements for accuracy due to the limitation of their own technology. Combined with the characteristics of power harmonic form, this paper analyzed the principle of wavelet transform and Fourier transform, and put forward a kind method with double-spectrum-line and window function based on the wavelet packet combined with FFT. This paper mainly studied the characteristics of different window functions, and added them to get the optimal window function for power harmonic detection by comparison. The simulation results verify that the harmonic measurement method has a good measurement effect in time domain and frequency domain, and the simulation experiment provides a good reference for the detection method of power harmonic of harmonic watt-hour meter and the selection of window function of signal interception.

Key words: power harmonic, fast Fourier transform (FFT), wavelet transform, window function