Novel Current Based Unit Protection Scheme for Transmission Line Connected to The Inverter Based DG

Addition of Photo Voltaic Based sources to the electrical grid has reduced the carbon emission from coal-based thermal generation and also the line losses as they are included in distribution system(DS). However, location and control schemes of DG modulate the fault current at the relay location. Further, an investigation on traditional current protection schemes with DGs reveals, a new protection scheme is essential for fault detection. The proposed method uses both ends current to compute the phase current ratio to detect fault with IBDGs. The threshold area is chosen considering the improvement of dependability, sensitivity, security, and reliability of relay. Simulation of a 100 kW PV array connected to a 25 kV, 60 Hz grid system in PSCAD/EMTDC reveals the proposed method has improved performance in detecting the internal fault.