Abstract

The FACTS (Flexible ac transmission systems) devices have all the capabilities to provide fast control of active and reactive power through a transmission line. The UPFC (unified powerflow controller) is a member of the FACTS family with very unique features. UPFC can control active and/or reactive power simultaneously or independently. This paper establishes the improved performance of ZSI (Z-Source inverter) based UPFC over VSI (Voltage source inverter) based UPFC for power flow improvement. The simulation models developed in MATLAB/SIMULINKhave been used to show the improvement in active and reactive power flows in an interconnected network.

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