Optimal control allocation for the parallel interconnection of buck converters

Jérémie Kreiss (1) , Marc Bodson (2) , Romain Delpoux (3) , Jean-Yves Gauthier (3) , Jean-François Trégouët (3) , Xuefang Lin-Shi (3)

1 CRAN - Centre de Recherche en Automatique de Nancy
2 Electrical and Computer Engineering Department [UTAH]
3 AIS - Ampère, Département Automatique pour l'Ingénierie des Systèmes

This paper presents a control algorithm for the parallel interconnection of heterogeneous power converters. A single resistive load is assumed to be fed by an arbitrary number of buck converters via a common DC bus. The approach is based on control allocation theory and a constrained quadratic optimization algorithm. The strategy achieves a fast voltage response with an optimal current distribution among the converters, while taking into account the current limits, the dynamic response, and the efficiency of the individual converters. An interesting by-product of the approach is the ability to put converters in and out of service through trivial adjustments of the code. The benefits of the approach are assessed through simulations and an experimental evaluation.

Mots clés: Control allocation; Quadratic optimization; Constraints management; Robust control; Parallel interconnection of power converters

Domaines: Automatique / Robotique

Jérémie Kreiss, Marc Bodson, Romain Delpoux, Jean-Yves Gauthier, Jean-François Trégouët, et al.. Optimal control allocation for the parallel interconnection of buck converters. Control Engineering Practice, 2021, 109, pp.104727. ⟨10.1016/j.conengprac.2021.104727⟩. ⟨hal-03310341⟩