In this paper, analytic duty cycle control laws for a three‐phase step up/down converter containing seven active switches are first derived to achieve a clean sinusoidal input current, adjustable power factor, bidirectional power flow capability and clean output DC voltage. Then a DC model and a small signal model are derived by means of coordinate transformation, perturbation and linearization. Finally, some simulation results are also presented to verify the validity of the theoretical results.
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Chen et al. (1999) studied this question.
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