Sliding Mode Control of DC Bus Voltage of a Hybrid Sources using Fuel Cell and Supercapacitors for Traction System

The use of fuel cells (FCs) as embarked electrical energy needs a storage system with high dynamic performances. This device allows a peak load shaving, and compensates the intrinsic limitations of the main source. The use of supercapacitors (SC) as a storage system is quite suitable, because of: appropriate characteristics (huge capacitance, weak serial resistance), of direct storage (energy ready for use), of easy control by power electronic conversion and high dynamic storage elements in compare with slow dynamic FC device. This paper concerns the control of the Dc voltage of a hybrid sources using FC as main source and SCs as transient power source. The proposed structure is presented with a sliding mode control and simulation results.