Predictive current control strategy for a three-phase grid connected photovoltaic-wind hybrid system

Abstract

This paper presents predictive current control strategies for a grid integration of photovoltaic-wind hybrid energy systems with versatile power transfer. The hybrid system is the combination of photovoltaic (PV) array, wind turbine via a common dc bus. For PV generation system, the Incremental Conductance (IncCond) MPPT algorithm is used to be compared with the Perturb and Observe (P&O) MPPT algorithm. For wind generation system, a simple and cost maximum power extraction control strategy is proposed for the permanent magnet synchronous generator (PMSG) based variable speed wind energy conversion system. The speed of PMSG is estimate using a model reference adaptive speed (MRAS) observers only by measuring phase voltages and currents. Extensive simulation results using Matlab/SIMULINK established that the performance of the controllers is quite satisfactory under to climatic condition step change (wind speed, irradiance). The effective ness of the developed controller is also tested for step no load to full load.