Novel Protection Scheme For UPFC Compensated Line

The inclusion of Unified Power Flow Controller (UPFC) in long transmission line increases the transient and steady state stability. The conventional distance relaying technique finds difficulty to protect such UPFC compensated transmission line. Therefore, in this article a fast and reliable method is presented for fault detection and classification in a UPFC compensated line. The proposed method based on transient monitoring indexed three phase current for detecting fault and transient monitoring index assisted K-nearest neighbor (KNN) classifier for fault type identification. The evaluation of presented method is tested on a two machine 400 kV, 50 Hz UPFC compensated line developed in MATLAB/Simulink platform for several condition of power system like varying location, varying fault resistance and varied fault inception angle.