Distributed Power Flow Controller in Transmission Systems to Compensate Unbalanced 3-Phase Currents

It is self-possessed of the Distributed Power Flow Controller is a new device within the family of FACTS. The growing demand and aging of network make it desirable to control the power flow in powertransmission systems fast and reliable. The load changes the voltage variation in transmission lines should be lmited, otherwise the consumers equipments are damaged at the distributed side. For reducing these types of problems this controller is developed. The DPFC has the same control capability as the UPFC, but with much lower cost and higher reliability and flexibility. This paper addresses one of the applications of the DPFC namely compensation of unbalanced currents in transmission systems. Since the series converters of the DPFC are single phase, the DPFC can compensate both active and reactive, zero and negative sequence unbalanced currents. To compensate the unbalance, two additional current controllers are supplemented to control the zero and negative sequence current respectively. This paper consists of both active and reactive variations, using MATLAB/SIMULINK is simulated and its effects on the transmission lines observed. The simulated results are analyzed and validated with the real time results for the system considered.