Constant input power control of three-phase isolated buck+boost rectifier

	Constant input power control of three-phase isolated buck+boost rectifier
Iranian Journal of Science and Technology Transactions of Electrical Engineering
شناسنامه علمی شماره، دوره 34، شماره 6، اسفند 2010، صفحه 637-648 اصل مقاله (1.17 M)
شناسه دیجیتال (DOI): 10.22099/ijste.2010.830
چکیده
A novel control method is proposed for single-stage three-phase isolated buck+boost rectifier. The control method is based on the conventional cascade two-loop control structure and is modified to achieve constant instantaneous input power. Input voltages, output voltage, and DC-link inductor current are measured to control the power switches to achieve output voltage regulation as well as input power factor correction. In the proposed method, input currents are controlled such that input power is constant, even for unbalanced mains. Thus, for the balanced mains converter it behaves like an ideal rectifier, and for unbalanced mains, low-frequency harmonics of the output voltage are suppressed. The performance of the proposed control structure is verified by the numerical simulation of a 6kW, 380V/48Vdc designed prototype.
کلیدواژه‌ها
Three-phase single-stage power supply؛ buck+boost rectifier؛ unbalanced mains؛ power factor correction

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