| Summary: | 博士 === 國立臺灣大學 === 電機工程學研究所 === 88 === This dissertation proposes a new family of digital algorithms based on Discrete Fourier Transform (DFT) for phasor/frequency measurements in power systems. This family, we called Extended Discrete Fourier Transform (EDFT) family, smartly avoids the errors that arise when frequency deviates from the fundamental frequency, and keeps all the advantages of the DFT e.g., immune to harmonics of fundamental frequency and recursive computation. The key point of this dissertation is not that using single algorithm to deal with all kinds of complicated signals on the bus, but choosing the proper member of EDFT family by case to compute phasor and frequency accurately. Therefore, harmonics, noise and DC offset, which are not taken into consideration by DFT, have their own algorithm in EDFT family. Moreover, this dissertation proposes general form of EDFT family, which makes the member of EDFT family combine each other easily, to compute complicated signals on the bus.
Since EDFT family reserved the advantages of DFT and had brilliant performance of frequency tracking; furthermore, EDFT family is very easy to implement, it is very suitable for use in power systems.
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