Parallel interconnection of buck converters revisited

Abstract

This paper addresses the problem of current-sharing for interconnected power converters. It focuses on heterogeneous set of buck converters, feeding an unknown resistive load via a common DC bus. As a main contribution, it proposes a novel framework which completely separate voltage regulation from current distribution dynamics, hence preventing undesirable interaction between them. Such a reformulation is performed on the open-loop model so that control law candidates are not restricted to some particular class. Arbitrary large set of heterogeneous converters can be handled and no frequency separation assumption is required, hence offering tractability without sacrificing performance. Remarkably, voltage regulation boils down to the control of a single virtual buck converter. Controller design example exploiting the new structure is provided.