A two-dimensional FFT algorithm for three phase inverter fed systems

A spectrum analyzer is presented for three-phase inverter-fed balanced machine systems that is capable of calculating up to 24 harmonic components of the line currents every 130 mu s. The method is based on a synchronized sampling technique and a high-efficiency FFT for three-phase systems. The latter consists of a two-dimensional six-point DFT followed by a two-dimensional four-point DFT. The total FFT algorithm has been successfully implemented on a TMS32010 digital signal processor.<
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