A distributed ESO based cooperative current-sharing strategy for parallel charging systems under disturbances

摘要

In this paper, a distributed extended state observer (ESO) based cooperative control is proposed to achieve current-sharing for parallel chargers under disturbances in energy storage type light rail vehicle systems. By treating the parallel charging system as a nonlinear and non-identical multiagent system, the current-sharing objective is converted as a distributed leader-follower consensus problem. A distributed ESO is designed to observe total disturbances with the known information from the established mathematical model of subchargers. A tracking differentiator (TD) is established to provide a transitional process for the reference signal to increase the dynamical performance and robustness. Based on ESO and TD, a distributed cooperative control protocol is proposed. Simulation and experimental results are provided to verify the disturbance rejection ability, feasibility and practicability of the proposed distributed current-sharing control method.