A Decision Tree-based Method of Loss of Excitation Protection of Synchronous Generators in Presence of UPFC

In this paper, a Decision Tree-based method of Loss of Excitation (LOE) Protection of Synchronous Generators in Presence of Unified Power Flow Controller (UPFC) is presented. The presence of UPFC causes the Berdy relay to be delayed in detecting LOE. In the proposed method, different variables are considered and in the various test and training patterns and using intelligent algorithms, the most suitable variables selected to increases the accuracy in detecting the time of LOE. The simulation results in Matlab/Simulink software validate the accuracy of the proposed method in various loadings, different percentages of loss of excitation, various scenarios of fault and noisy conditions. The results reveal that the proposed method has a better classification accuracy and a higher identification speed under new and unseen operating conditions of LOE and external faults compared to traditional methods.