Mwinyiwiwa, Bakari M. M.Ooi, B. T.Wolanski, Z.2016-03-222016-03-221998-06Bakari Mwinyiwiwa, Boon-Teck Ooi and Zbigniew Wolanski, "UPFC Using Multi-Converters Operated by Phase-Shifted Carrier SPWM Strategy," IEEE Trans. on Industry Applications, Vol. 34, No. 3, May/June, 1998, pp. 495-500.0093-9994http://hdl.handle.net/123456789/1185Full text available at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=673719&newsearch=true&queryText=UPFC%20Using%20Multi-Converters%20Operated%20by%20Phase-Shifted%20Carrier%20SPWM%20StrategyThe acronym UPFC covers Ggugyi's unified power flow controller and Akagi and Fujita's unified power flow conditioner. This paper describes one method of meeting high MVA specifications by using multiple modules of two-level three-phase power converter modules controlled by the phase-shifted triangle carrier technique of the sinusoidal pulsewidth modulation (SPWM) strategy. Two conceptual designs are presented. The first is the gate-turn-off (GTO)-SPWM-UPFC at the lowest switching rate, fc/fm=3, to minimize GTO switching loss. The design is based on applying the fundamentals of SPWM theory to overcome unbalances arising from sideband harmonic interferences. The second is the insulated gate bipolar transistor (IGBT)-SPWM-UPFC, at fc/fm=12 or higher, in which SPWM theory assures that direct paralleling of the modules is free of current unbalance. A laboratory UPFC based on six modules of three-phase 5-kVA size IGBT power converters operating at the baseline condition of dual unity displacement factor at the sending end and the receiving end has been implementedenPWM power convertorsflexible AC transmission systemsharmonic distortioninsulated gate bipolar transistorspower bipolar transistorspower factor correctionpower semiconductor switchespower system harmonicsswitching circuitsthyristor convertorsJournal Article10.1109/28.673719