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《Power System Technology》 2004-14
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A NOVEL FREQUENCY TRACKING ALGORITHM

WU Du-gui;HE Chun;YI Yong-hui XJ Hitachi Electric Co. Ltd., Xuchang 461000, He'nan Province, China  
Frequency tracking is an important measure to avoid the misoperation of protective relaying. Here, at first the basic formulae of Fourier transform under the sampling frequency mismatch are deduced. Through the analysis on the transform results a novel frequency tracking algorithm is presented. Then the main implementation procedures of the presented algorithm are described, the characteristics and design approach of two digital filters during the implementa-tion are given. The effectiveness of the presented algorithm is verified by a practical calculation example.
【CateGory Index】: TM935
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