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Mathematical Problems in Engineering
Volume 2014, Article ID 636784, 12 pages
http://dx.doi.org/10.1155/2014/636784
Research Article

Distributed Cooperative Current-Sharing Control of Parallel Chargers Using Feedback Linearization

1Hunan Engineering Laboratory for Advanced Control and Intelligent Automation, School of Information Science and Engineering, Central South University, Changsha, Hunan 410075, China
2School of Science, Engineering and Mathematics, Bethune-Cookman University, Daytona Beach, FL 32114, USA

Received 16 December 2013; Accepted 19 February 2014; Published 7 April 2014

Academic Editor: Guoqiang Hu

Copyright © 2014 Jiangang Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a distributed current-sharing scheme to address the output current imbalance problem for the parallel chargers in the energy storage type light rail vehicle system. By treating the parallel chargers as a group of agents with output information sharing through communication network, the current-sharing control problem is recast as the consensus tracking problem of multiagents. To facilitate the design, input-output feedback linearization is first applied to transform the nonidentical nonlinear charging system model into the first-order integrator. Then, a general saturation function is introduced to design the cooperative current-sharing control law which can guarantee the boundedness of the proposed control. The cooperative stability of the closed-loop system under fixed and dynamic communication topologies is rigorously proved with the aid of Lyapunov function and LaSalle invariant principle. Simulation using a multicharging test system further illustrates that the output currents of parallel chargers are balanced using the proposed control.