Hybrid linear/non-linear adaptive controller for battery charger/discharger in renewable power systems

This paper presents the control of an Energy Management System (EMS) for renewable DC sources connected to the load and a battery. The EMS is aimed at improving the performance of electric systems such as electrical vehicles and stand-alone applications. This work considers a Boost converter controlled by a Maximum Power Point Tracking algorithm (MPPT) to maximize the power gen-eration of a renewable DC source. Moreover, a battery charger/discharger, based on a bidirectional dc/dc converter, is used to control the energy flows between the generator, the battery and the load. This paper proposes a sliding-mode current controller to guarantee the global stability of the bidirectional converter, i.e. of the EMS. In addition, a digital adaptive controller is proposed to regulate the voltage of the EMS DC bus, which enables to provide a stable load voltage. Detailed simulation results validate the proposed controller.