147 EECS 438 Performance of Grid-Connected Hybrid Photovoltaic/Fuel Cell/Battery Distributed Generation Systems Ahmad Eid, Member, IEEE Electrical Engineering Department, Aswan Faculty of Engineering, Aswan University, Egypt ahmadeid@ieee.org Abstract In this paper, the performance of grid-connected hybrid distributed generations is studied. The hybrid system includes Photovoltaic (PV) panels, Fuel Cells (FC) and Battery Energy Storage System (BESS). The PV module operates at maximum available power (maximum 20kW) regardless of the environmental conditions using P&O MPPT control method. The FC model provides a maximum power of 40kW using a current controlled DC/DC boost converter. The BESS consists of a battery, a bidirectional DC/DC converter and a controller. The BESS is responsible for smoothing and regulating the DC bus voltage at 400V during off-grid mode by charging/discharging the battery. During grid-connected mode, a PQ-controlled bidirectional PWM inverter connects the hybrid generations to the utility. The adopted control methods show good performance of the micro-grid at transient and steady state operations in terms of power transfer, load sharing and quality of the DC and AC bus voltages in both autonomous and grid-connected modes of operations. Keywords: Photovoltaic, Fuel Cell, Battery, DC Micro-grid, Converters. 1. Introduction Distributed generations (DG) are sources of energy located near local loads and can provide a variety of benefits including improved reliability, self-healing and load control if properly operated in the electrical distribution system. Micro-grids are systems that have at least one distributed energy resource, associated loads, and can form intentional islands in the electrical distribution systems. Numerous benefits arise from this ability to island for events like faults and voltage sags. Smart islanding can greatly enhances the value proposition for the utility and the customer. Within micro-grids, DG resources are controlled to be disconnected and reconnected to electric power system with minimal disruption to the local loads [1]. DG technologies typically include photovoltaic (PV), wind, fuel cells, micro-turbines, and International Conference on Electrical Engineering and Computer Sciences, March 15-17, 2013, Tokyo, Japan