An Adaptive Phasor Estimation Algorithm for Numerical Protective Relays Based on the Generalized Delayed Signal Cancelation Method

摘要

In this paper the generalized delayed signal cancelation (GDSC) method is used for estimating the fundamental-frequency positive-sequence, negative-sequence and zero-sequence vector components of the voltages and currents to be processed by a distance relay. The GDSC filtering characteristics allow fast frequency-adaptive extraction of the sequence components of distorted three-phase signals, avoiding the use of the Fortescue transform. The proposed algorithm is incorporated into a symmetrical component distance relay, and the code is implemented in a low-cost digital signal processor. Real fault data obtained from digital fault recorders are used for evaluating the performance of the proposed relay algorithm.