Flatness-Based Control Strategy for n Parallel Connected Boost Choppers and n Sources With Differing Characteristics

This letter presents a new control strategy based on a differential flatness approach for
$n$
boost choppers and
$n$
sources connected in parallel with different characteristics, the objective being to make them work on the same voltage bus. We first give an in-depth study of flatness of the
$n$
-boost system and propose a flat output for this type of boost choppers configuration, which ensures homogeneous power sharing among the choppers and guarantees continuous current in at least
$n-1$
choppers. Another contribution is the establishment of a relation between the proposed flat output and the regulation of the DC bus voltage via an additional power load control loop. To demonstrate the effectiveness of the proposed control strategy, this letter includes simulation results for three boost choppers and sources connected in parallel with different characteristics.