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A new algorithm has been developed for phasor estimation of the current signal within numerical protective relays which effectively filters out harmonics, noise, and decaying dc offset. Analytical analysis is presented to show the effect of decaying dc on discrete Fourier transform (DFT)-based phasor estimation. Based on the presented theory, a new method is proposed to first estimate the decaying...
In recent years, phasor measurement units (PMU) and wide-area monitoring systems (WAMS) techniques have been widely used in power systems to perform various monitoring, control and protection functions. It is a growing requirement for digital protective relays to include synchrophasor measurement functionalities for the apparent economical benefits. Modern digital protective relays typically use variable...
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