Due to ever increasing energy consumption, rising public awareness of environmental protection, and steady progress in power deregulation, alternative i.e., renewable distributed generation (DG) systems have attracted increased interest. Wind and photovoltaic (PV) power generation are two of the most promising renewable energy technologies. PV systems also show great potential in DG applications of the future due to their fast technology development and many merits they have, such as high efficiency, zero or low emission (of pollutant gases) and flexible modular structure. The modelling and control of a hybrid wind/PV/FC DG system is addressed in this paper. Different energy sources in the system are integrated through DC bus. Dynamic models for the main system components, namely, wind energy conversion system (WECS), PV energy conversion system (PVECS) and power electronic interfacing circuits are developed. Power control of a grid-connected PV and wind energy conversion system as well as load mitigation control of a stand-alone system is investigated. The pitch angle control for WECS and the maximum power point tracking (MPPT) control for PVECS are also addressed in the paper. Based on the dynamic component models, a simulation model for the proposed hybrid energy system has been developed using MATLAB/Simulink.
