Discrete-Time Modeling and Control of Double Dual Boost Converters With Implicit Current Ripple Cancellation Over a Wide Operating Range

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Abstract
This paper introduces discrete-time controllers for double dual boost converters, suitable for renewable energy applications. The proposed schemes are based on a current ripple mitigation technique, which enables an unconstrained input-to-output voltage converter gain. This is in contrast with classical interleaved topology implementations, where duty cycles are restricted (e.g. to 50%). A discrete-time small-signal controller is proposed for those applications that require nominal specifications. This control strategy is based on a novel linear difference system approach, while gain tuning is performed via numerical computation of LMIs (linear matrix inequalities). In addition, a discrete-time large-signal controller is proposed for those applications that require trajectory tracking. The proposed controllers, their stability, performance and ripple cancellation properties, are theoretically validated via experimental results.

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