Control strategies of a fuzzy controlled solid oxide fuel cell/battery distributed generation system for power quality enhancement

Abstract

The proposed work deals with the control strategies of a fuzzy controlled solid oxide fuel cell/battery hybrid distributed generation system. The grid connected hybrid system consists of a solid oxide fuel cell as its primary source of energy and battery as the complimentary source of energy. The battery energy storage compensates the slow transient response of the fuel cell (FC) stack and supports the FC to meet the grid power demand. A Matlab/Simulink model is built for the fuel cell power plant, DC-DC converter & DC-AC converter using fuzzy logic control to regulate the fuel flow to meet the output power demand. The fuel cell/ battery hybrid distributed generation system is studied for voltage sag and voltage swell under unbalanced conditions. Simulation results illustrates the system performance for enhancement of power quality for voltage sag and swell, battery state of charge (SOC), active and reactive power, fuel cell voltage, voltage at point of common coupling and molar flow rate of the fuel cell.