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1. NEXGEN TECHNOLOGY
www.nexgenproject.com POWERELECTRONICS 2015-16
Three-Phase AC-AC Converter With Controllable Phase and Amplitude
Based on single-phase AC-AC converter with controllable phase and amplitude
(ACCPA), a three-phase ACCPA without third harmonic trap was proposed for power
transmission control in grid by adopting symmetrical relationship of three-phase. The three-
phase ACCPA is comprised of two parts which are used to adjust the phase and amplitude of
three-phase output voltage respectively and continuously. Its front-part is made up of 3 Buck
type AC converters, and the back-part is a three-phase Boost type AC converter. The operation
principle of three-phase ACCPA, the adjustable ranges of the phase and amplitude of the front-
part, and the calculation formulas of control parameters under ideal conditions were studied and
deduced in detail. Further more, the control accuracy of the phase angle was discussed for three-
phase ACCPA with digital control, and then the method to select close-loop control parameters
was obtained. The control strategy of three-phase ACCPA was presented and a prototype was
fabricated. The experimental waveforms and testing results verified the correctness of the
theoretical analysis and the feasibility of the control strategy.