Authors: Zhongyou Luo; Shuping Song; Ling Zhang; Puzhi Zhao; Haijiang Zhang
Addresses: State Grid Xinjiang Electric Power Co., Ltd., Research Institute, Urumchi, Xinjiang, China ' School of Electric and Automatic Engineering, Changshu Institute of Technology, Changshu, Jiangsu, China ' State Grid Xinjiang Electric Power Co., Ltd., Research Institute, Urumchi, Xinjiang, China ' State Grid Xinjiang Electric Power Co., Ltd., Research Institute, Urumchi, Xinjiang, China ' Zhongling High-tech Co., Ltd., Yangzhou, Jiangsu Province, China
Abstract: The computational complexity of interpolation algorithms is a major concern for real-world power harmonic parameter estimation based on the windowed-interpolation Fast Fourier Transform (FFT) algorithm. A new interpolation algorithm is proposed in this study to estimate the harmonic parameters of power system. This technique is based on the frequency-domain characteristics of the mainlobe of the weighting cosine window, and its calculation formulas are obtained by employing Newton's divided-difference interpolation polynomial. The validity of the proposed algorithm is confirmed through computer simulations via MATLAB and field tests in a photovoltaic system. The results show that the proposed algorithm has the advantage of low computational effort and can be employed for any cosine window.
Keywords: FFT; harmonic parameter estimation; cosine window; interpolation; Newton's divided-difference interpolation.
International Journal of Computer Applications in Technology, 2021 Vol.67 No.2/3, pp.159 - 167
Received: 05 Nov 2020
Accepted: 06 Jan 2021
Published online: 17 Mar 2022 *