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《Power System Technology》 2007-23
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A High-Precision Algorithm for Frequency and Phasor Based on Fourier Transform

YU Yong-zhi,ZHANG Zhong-min,XI Zhi-hong(School of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang Province,China)  
Discrete Fourier transform(DFT) is the basic method for the measurement of frequency and phasor of power system.In this paper the authors firstly analyze the measuring error existing in traditional DFT algorithm;then based on conventional DFT propose a forward recursive DFT algorithm in which the frequency and phasor can be measured by use of three data derived from DFT,thus the operation amount can be effectively reduced.The correctness of the proposed algorithm is validated by simulation.Simulation results also prove that the measuring error caused by conventional DFT can be effectively reduced and the measuring accuracy of the proposed algorithm is high.
【CateGory Index】: TM935.1
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