Rapid developement of high power semiconductor devices with fast control features have given birth to several Flexible AC Transmission Systems (FACTS) controllers for improving power system performances. One of the advanced FACTS Controllers is Unified Power Flow Controller (UPFC), which can control power flows, both real and reactive in Transmission line. This paper presents performance analysis of UPFC based on d-q axis theory. So far the standard practise of realizing the UPFC has been confined to connecting two inverters back to back with a DC link capacitor in between. This capacitor brings with it several disadvantages which affects the overall reliability of the UPFC. The Matrix Converter (MC) topology comes without any such bulky reactive element except for lighter components as filters. This paper examines the effectiveness of MC as UPFC and simulation results shows a comparable performance with the traditional back to back constructs.

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A direct matrix converter working as a regulated voltage supply unit for power system (synchronous) applications has been considered in this work. Input filters design is initially presented where based on ripple attenuation, allowable regulation, losses and reliable commutation, certain boundary values are derived. This is followed by output filter design and thereafter for controller design, the effect of a chosen filter parameters on the dynamic performance has been investigated. Thereby a design oriented tool is obtained by which an integrated approach towards overall system design becomes possible. Finally experimental results on a 6 kVA prototype are presented to validate the analysis.

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