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

Abstract EN

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.