The paper presents a discrete-Fourier-transform (DFT) filter bank for power-system harmonic measurement. It has the ability to measure harmonic contents in time and frequency domains, and is ideal for long-term of observation harmonics. It can also overcome shortcomings of the windowed fast-Fourier-transform (FFT) algorithm. The subject of the DFT filter bank is closely related to multi-rate digital-signal-processing (DSP) technique. Hence, this method using the multi-rate technique is very efficient. Finally, an actual field test is implemented to measure power-frequency harmonics.
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Shun Lu (2005) studied this question.
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