Advanced Fault Detection and Protection Strategies For UPFC Compensated Power Networks

Abstract

Transmission line faults are the unavoidable key and intricate barrier for the safe and newlinestable power system operation. Although traditional distance and differential protection strategies newlineare widely adopted to protect, but, may experience difficulties due to incorporation of FACTS newlinecontrollers, integration with large scale renewable and presence of fault current limiters. Further, newlineTransmission lines may experience a cascaded outage if such relays malfunction. This thesis newlinefocuses on the single and both ended protection schemes for UPFC compensated transmission line newlineconsidering the effect of SFCLs and WFs. newlineThe non-linear operation of the UPFC results transient components in the voltage and newlinecurrent phasors. The actual information gets corrupted due to non-linear operating modes of newlineUPFC. This would result malfunction of various well-known unit protection schemes. Instead of newlinegoing any phasor or time domain based approach, a signal decomposition based energy operator is newlinederived which can capture the transient information. The two end current information is utilized to newlineobtain this energy index which helps to detect the fault and proper classification of the fault phase. newline Large-scale doubly fed induction generator-based wind farms (DFIG-WFs) have a newlinesignificant impact on transmission line conventional differential schemes due to their dynamic newlinefault current characteristics, transient behavior, and fluctuating output power. Additionally, the newlinecombined impacts of the FACTS controller and WFs negatively impact a number of unit newlineprotection strategies. STMPM, a data-driven approach, is presented to locate the error and then newlinedevelop the disturbance detection index (DDI) in order to complete this job. newlineUPFC and DFIG-WFs are two components that may add to fault current. The superior newlinetechnical performance of Superconducting Fault Current Limiters (SFCLs) in limiting fault newlinecurrents makes their use crucial in such a situation. The addition of SFCL, however, would make newlinethings more difficult for the current disturbanc