A new phaselet-based method for detecting the power swing in order to prevent the malfunction of distance relays in transmission lines

Abstract

The power swing can cause a false tripping of distance function and intensify the system disturbance by tripping non-faulted lines. Therefore, power swing blocking function is needed to prevent the malfunction of the distance relays. In this paper, a phaselet method is proposed based on the estimation of current samples and error calculations between estimated and actual values. To increase the speed and sensitivity of the algorithm, the phaselet method with a short data window is used. For further analysis of power swing, a two-area system and 39-bus New England system has been simulated using DIgSILENT power factory software. The proposed method has been tested for different modes of power swing (including fast and multi-mode swings) and the fault during power swing by using an experimental setup including the relay test set and distance relay. The obtained results show that the proposed method can exhibit fast and suitable performance in the actual conditions.