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MIMO Control of a High-Step-Up Isolated Bidirectional DC–DC Converter

This article proposes a multi-input multi-output digital control strategy for a bidirectional interleaved boost converter with coupled inductors, designed to operate as an interface between an ultracapacitor and a high-voltage dc-bus in a hybrid nanogrid. The control strategy keeps the high-voltage side dc-bus of the nanogrid stable when the voltage at the low-voltage side, connected to the ultracapacitor, changes in a wide range. Bidirectional energy flow control with current protection is allowed too. The high-voltage regulation loop is closed around an inner, low-voltage side current control loop. In parallel to these, a third, clamp voltage regulator is set to keep tight control over switch voltage stress. This article discusses the controller organization, the design criteria, and shows the subsequent implementation on a general purpose digital control platform. The achievable performance is experimentally verified on a 1.5-kW converter prototype.