DPFC System for Realizing Active Power Flow Control on Existing Power Lines

Abstract - The Distributed Power Flow Controller (DPFC) is a new device within the FACTS family. The DPFC consists of two types of converters that are in shunt and series connection with grids. The common dc link between the shunt and the series converters is eliminated. The active power exchange between the shunt and series converters that is through the common dc link in the UPFC, though the transmission line at the 3rd harmonic frequency. The redundancy of the series converters provides the high reliability of the system. The DPFC employs the distributed FACTS (D-FACTS) concept, which is to use multiple small-size single-phase converters instead of the one large-size three-phase series converter in the UPFC. The large number of series converters provides redundancy, thereby increasing the system reliability. As the D-FACTS converters are single-phase and floating with respect to the ground, there is no high-voltage isolation required between the phases. The DPFC has the control capability for the adjustment of the line impedance, the transmission angle, and the bus voltage. In this project a control scheme to improve the performance of DPFC during a failure is first introduced. The principle and analysis of the DPFC performance are presented in MATLAB. The proposed technique in this project for DPFC is Double Vector technique. The corresponding design of the control scheme along with the simulated experimental results is presented.