Performance analysis of distance relay in presence of unified interphase power controller and voltage-source converters-based interphase power controller

In recent years new FACTS devices based on voltage-source converters (VSCs) have been investigated. Unified interphase power controller (UIPC) is one of these novel FACTS controllers and the other one is VSC-based interphase power controller (VSC-based IPC).The purpose of this study is to investigate and compare the performance of distance relays on transmission lines in the presence of VSC-based IPC and UIPC, while working in power flow control mode. Simulation results show that the distance relay sees the higher apparent impedance in the presence of proposed FACTS devices. Detailed simulations for different faults types and locations are evaluated. Moreover, the impact of the FACTS device location on the apparent impedance seen by the relay is discussed.