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《Automation of Electric Power Systems》 2003-12
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INSTANTANEOUS HARMONICS DETE CTING METHOD FOR THREE-PHASE CIRCUITS BASED ON RESAMPLING

Liu Kaipei, Zhang Junmin, Chen Yanhui(Wuhan University, Wuhan 430072, China)  
A method for harmonic detecting based on resampling theory is proposed. It can improve the dynamic characteristics of digital filters. If the highest frequency in signal spectrum is ω, the first sampling frequency will be ω f≥4ω. When the active power filter (APF) is designed to compensate N′th harmonic currents, the resampling frequency should not be less than (N′+1+n)ω 0, (where ω 0 is the fundamental frequency). If the sampled data is N 1 in a period, the resampling frequency is ω min= (N 1/4)ω 0. Furthermore, a digital harmonic detecting system based on resampling, inheriting the core idea of the instantaneous detecting method, is designed. That is, transform the fundamental currents into DC component. Simulation shows that this system not only has accuracy and stability, but also overcomes the long existent weakness of large amount of calculation for the design of digital filter and poor on-line response characteristics and bad dynamic following performance of digital filters.
【CateGory Index】： TN713
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