MATRIX CONVERTER BASED UNIFIED POWER FLOW CONTROLLER

Abstract

This dissertation report discusses the role of Unified Power Flow Controller in controlling the real and reactive power flows in a transmission line. It also discusses the conventional converter topology of the UPFC and offers a alternate converter topology called Matrix Converter in order to realize the UPFC. It mentions the advantages of the MATRIX CONVERTER BASED UNIFIED POWER FLOW CONTROLLER as compared to the conventional VSC topology of UPFC. It also discusses the working of a matrix converter and also explains in detail the various modulation techniques of the Matrix Converter. Later, the performance of the Matrix converter is compared when it is subjected to different modulation signals. The simulation is carried out in PSCAD/EMTDC software and results are shown. The best available modulation technique is then used to develop theoretical principles of Direct Power Control based on sliding mode technique that are established for a Matrix Converter — UPFC dynamic model including the input filter. Hence, line active and reactive power, together with A.C. supply reactive power can be directly controlled guaranteeing good steady state and dynamic responses. It also shows decoupled active and reactive power control, zero steady state tracking error and fast response times.