Adaptive Distance Protection to Prevent False Relay Tripping during Power Swing

摘要

The existing distance relay is accommodated with starting function to detect shortcircuits in power system. However, this function proves vulnerable to distance relay operation as it could falsely send a tripping signal during power swing. Hence, it is important to introduce an adaptive concept to the distance protection to prevent such false tripping. This paper presents a simple and effective adaptive protection algorithm for power swing prevention based on Under Impedance Fault Detector (UIFD) characteristics. The proposed scheme is tested under IEEE 39 bus system and simulation results prove that the scheme is capable to identify the power swing conditions and adjusting the relay setting accordingly to avoid system mal-operation.