Modeling and simulation of grid-connected hybrid AC/DC microgrid

This paper presents a model of grid-connected hybrid AC/DC microgrid. The system is composed of wind turbine, micro-gas-turbine, photovoltaic cells, fuel cell, and ultra-capacitor for energy storage. All the generation units are connected to a distribution system to operate in grid-connected mode. Dynamic models for each system component are developed and used for short-time transient simulations. The simulation test-bed is realized using MATLAB/Simulink. Behaviors of the test-bed during steady state, sudden changes in wind speed, changes in solar irradiance, and during a line fault are studied in simulation. Finally, analysis of results and conclusions are provided.