Fault detection during power swing in thyristor-controlled series capacitor-compensated transmission lines

Abstract

Fault detection during power swing in compensated transmission lines by Thyristor Controlled Series Capacitors (TCSCs) is a challenging problem and conventional detection methods might not be accurate. In this paper, a high speed fault detection approach based on Mathematical Morphology is proposed. The proposed method uses voltage and current signals for fault and swing detections, respectively. The performance of the proposed method is evaluated using two simulation case studies simulated in PSCAD/EMTDC: (i) a single machine infinite bus network and (ii) IEEE standard 9 bus three machine network. It is shown that the proposed approach is not sensitive to nonlinear behavior of TCSCs and it is capable of detecting all types of faults, including three-phase ones, during power swing accurately. In addition, due to low computational complexity, the proposed method provides significantly high detection speed.