In order to address the output current imbalanced problem of the parallel chargers for energy storage type light rail vehicles, a current-sharing scheme is proposed based on the distributed cooperative control of multi-agent systems. If each charger is considered to be an agent, the current-sharing control design would resemble a consensus-tracking problem of multi-agent systems with bounded input constraints. The communication network among the chargers can be taken as an undirected graph. Each charger exchanges current information with its neighbors through the communication network. Due to the fact that the charging system has non-identical feature and the control input is bounded, input-output feedback linearization is adopted to transform the current-sharing control of the charging system to a first-order integrator consensus-tracking problem. A saturation function is introduced to design a bounded cooperative current-sharing control law based on the nearest neighborhood rule. The cooperative stability of closed-loop system under the fixed topology is rigorously proved by Lyapunov function integrating LaSalle invariant principle. The output current of parallel chargers can be balanced by adopting the proposed control methodology, which is verified by simulating a multi-charging test system.
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