Abstract
It is well known that for the conventional three-phase hysteresis current controller, the maximum current error can reach twice of the specified error bound. In this paper, a truly error bounded current controller for three-phase AC/DC boost converter is proposed to keep the error within the specified error bound precisely in theory. Moreover, according to the current error and the extra information of the current error derivative, the zero voltage space vectors can be added at proper time to further reduce the switching frequency. A simple implementation is also proposed without calculating the error derivative such that merits of the conventional hysteresis current controller can still be reserved. Theoretical basis and some simulation results are given to demonstrate the validity of the proposed current controller.
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