Design, Control and Performance Analysis of a Grid-Connected Hybrid System

The present paper proposes a dynamic modeling and control of grid-connected
PV/Wind hybrid system. The photovoltaic and wind energy conversion systems are
integrated into main AC bus in order to increase system effectiveness. The PV system
is equipped with DC-DC boost converter and three phase PWM inverter. The wind
energy conversion system includes doubly fed induction generator (DFIG) based
variable speed wind turbine, rotor side converter (RSC) and grid side converter
(GSC). The modelling, analysis and simulation of the hybrid system has been
implemented using MATLAB/Simulink environment. The maximum power point
tracking (MPPT) technique is applied for both photovoltaic and wind systems to
capture the maximum power under varying climatic conditions. The dynamic
performance of the proposed hybrid system is analyzed under different
environmental conditions such as changes of solar irradiation and wind speed. The
simulation results show that the voltage at point of common coupling (PCC)
maintains constant. Morever, the current of grid side is in sinusoidal and alternative
form. This grid side current is synchronized with grid side voltage and injected power
to grid is around power delivered by the hybrid system.