Improving Distance Protection for Out-of-step Detection and Fault Detection during Power Swings

Citation:
Ibrahim, D. K., E. E. - D. A. El-Zahab, and M. Essam Mohamed, "Improving Distance Protection for Out-of-step Detection and Fault Detection during Power Swings", 16th International Middle East Power Systems Conference, MEPCON 2014, 2014.

Abstract:

To ensure high reliability of the power system, distance relays are blocked during power swings. However, if a fault occurs during a power swing, it should be detected and the unblocking function should be invoked to clear the fault as soon as possible. Distinguishing stable and unstable power swing is one of the challenging tasks for distance relays. This paper proposes a combined scheme for detectingfaults occurrence during power swings and accurate determination of power swing stability status. The proposed scheme utilizes a differential power-based technique and a negative sequence current based technique for detecting faults occurrence during power swings. Moreover a wavelet based power angle criteria based algorithm is applied for distinguishing stable and unstable power swings. The proposed scheme is extensively tested for symmetrical and unsymmetrical faults during slow and fast power swings for simulated tested power systems using ATP software.

Notes:

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