Sliding mode control of a multi-source renewable power system

This paper presents advanced power management strategy for a stand-alone hybrid power system. The proposed system consists of a photovoltaic panel, Proton exchange membrane fuel cell and a battery-electrolyzer-super capacitor energy storage system. All the system components are connected to the same DC voltage bus through appropriate Dc-Dc power converters and supposed to be controlled by independent control system. The power management strategy controls the power flow between the hybrid system components and decides the amount of the load power shared with each power source, depending on the load power and the battery state of charge, moreover the proposed strategy manages the loads according to the power availability to preserve the energy balance of the system. The performance of the proposed control strategy is tested by simulation in different operating condition. The simulation result confirms the effectiveness of the proposed control strategy, as it increases the reliability of the system and improve its energy balance.