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《Journal of Changsha University of Electric Power(Natural Science)》 2005-03
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An Algorithm of Instantaneous Harmonic Detection Based on Positive Sequence and Simpson's Formula in Three-phase Three-wire Power System

LIU Chuan-lin,HOU Ning-ning,ZHANG Ying-feng (Guangdong Technical College of Water Resources and Electric Engineering, Guangzhou 510635,China)  
Because positive sequence active current i_(+p) ( positive sequence reactive current i_(+q)) contains only 3k harmonics (k is integer) according to the i_p-i_q calculating mode in 3-phase 3-wire, the authors proposed an instantaneous harmonic current detecting approach utilizing a filter algorithm to obtain direct component of the positive sequence fundamental current based on discrete Simpson's formula integral average calculation. The positive sequence fundamental current can be extracted by inverse transform, and harmonic currents can be gained through reduction.This filter algorithm is easier in digital implementation and fewer in calculation. Computation and simulation showed that the harmonic detecting approach has preferable dynamic performance in harmonic detection and it can be applied for 3-phase 3-wirepower system.
【CateGory Index】: TM935
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