A robust single ended disturbance detection scheme for superconducting fault current limiter integrated UPFC compensated line

Abstract

The occurrence of short circuit events in a high voltage or extra high voltage transmission system may result in a fault current with high magnitudes. Additionally, the inclusion of Unified Power Flow Control (UPFC) contributes to fault current. In such a scenario, the use of Superconducting Fault Current Limiters (SFCLs) is very vital because of their better technical performance to limit fault currents. However, inclusion of SFCL may cause difficulties for existing disturbance detection units. To overcome such an issue, this manuscript aims for a new disturbance detection approach based on sliding window Singular Spectrum Analysis (SSA). The proposed method begins with the reconstruction of the fault signal using SSA and then computes the transient error by subtracting the reconstructed fault signal from the original signal. This transient error is used as a fault detection index (FDI) which is also used to classify the faulty section. The superiority of the presented technique is tested for two different UPFC compensated power networks equipped with two different SFCLs, modeled using EMTDC/PSCAD 5.0. The obtained results show the effectiveness of the addressed method, obtained by simulating different adverse scenarios (fault and non-fault) which justify the real-time application of the proposed protection method.