CONTROLLING ENERGY STORAGE SYSTEM BY USING A FUZZY LOGIC CONTROLLER AND ANALYSIS THE EFFECTS OF ADDING A SUPERCAPACITOR FOR AN ELECTRICAL VEHICLE MASTER’S THESI

Abstract

Intelligent energy storage system was design and presented by using a battery pack connected in parallel with a supercapacitor which is directly connected to the load, the battery is connected to a parallel bi-directional DC/DC converter which has as a main job to regulate the output current of the battery so it can match the supercapacitor current and reduce the output current’s ripples. The directly connected supercapacitor used in the intelligent energy storage system to reduce the pressure on the battery pack either in the quick acceleration because it required a huge power for a short period, or in the braking state where the electrical vehicle convert the kinetic rolling energy into electrical energy to charge the storage system, where the motor produce a huge amount of power, so the directly connected supercapacitor capture this energy which prevent high power loading on the battery, which improve the whole performance of the vehicle by increasing the life cycle of the battery pack. The Fuzzy Logic Controller was designed to determine the Duty Cycle (the Duty cycle is calculated based on the desired motor speed or the output motor current), which control the DC/DC converter. The simulation was done on SIMULINK MATLAB platform