An overview of power harmonic analysis based on Triangular Self Convolution window

Abstract

Harmonic estimation plays a vital role in maintaining power system, and for reliable measurement of the harmonics, Windowed Interpolated Fast Fourier Transform (WIFFT) has been used. In this paper, supply voltage harmonics are analysed by Triangular Self-Convolution Window (TSCW), Hanning and Hamming WIFFT. TSCW is ameliorated window than previously existing Hanning and Hamming windows. By comparing these three windows it is observed that TSCW reduces the measurement errors and gives more precise results while estimating the harmonics. One more advantage with TSCW is that it is also able to detect the weak harmonics, which is not possible with Hanning and Hamming Window. Narrow main lobe and high side lobe decaying rate make TSCW capable of compressing the spectral leakage. The validity of the proposed comparison was confirmed by simulation and practical experiment of the supply voltage harmonic signal as input