UPFC and IPFC are FACTS devices that can control active and reactive power flow in transmission line by means of injection controllable series voltage to the transmission line. This paper proposes a new connection for a Unified Power Flow Controller (UPFC) to improve the power flow control of one transmission line in a power system and it regulates bus voltage in another transmission line. It is connected between two different transmission lines, this connection of the UPFC will be called an interline UPFC (IUPFC). It is one of the newest devices within the FACTS technology. The structure and capability of the IUPFC is discussed and its control scheme is based on the d-q orthogonal coordinates. The obtained simulation results from Matlab/simulink confirm the effective features.
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