Adaptive phasor estimation algorithm to enhance numerical distance protection

Auxiliary Prony‐based algorithm for performance improvement of DFT phasor estimator against transient of CCVT

“…After applying (6), by utilising frequency calculation in [26], the frequency deviation is calculated. This frequency deviation is applied to (8) to (11) to update frequency coefficients and to prevent instability due to offnominal frequency condition.…”

“…Concentrating on CCVT transient impact on the performance of protective relays, several modified distance protection schemes have been presented to deal with the impact of CCVT transient during relay operation [8][9][10][11][12][13][14][15][16]. These publications have mostly focused on the overreach phenomena in distance relays.…”

A Study on Deep Neural Network-Based DC Offset Removal for Phase Estimation in Power Systems

“…In recent decades, various algorithms and methods have been proposed to deal with the DC offset problem [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. An approach to remove the DC offset from fault current waveforms is to modify their discrete Fourier transform (DFT) in the phasor domain [2][3][4][5][6][7][8][9][10][11].…”

“…Another approach is to remove the DC offset directly in the time domain [12][13][14][15][16][17]. Most time-domain algorithms significantly remove the DC offset faster than phasor-domain algorithms.…”

“…Most time-domain algorithms significantly remove the DC offset faster than phasor-domain algorithms. Phasor estimation can also be achieved in the time domain, either simultaneously with or directly after removing the DC offset [12][13][14]. These methods provide a fast response, but are prone to errors when the fault current waveform contains high-frequency components.…”