Design and Control of Solar-Wind Integrated Conversion System with DFIG for Maximum Power Point Tracking

This paper provides a technique for the control of a wind turbine system drawing power from the grid and solar energy sources for rotor injection. A Doubly Fed Induction Generator (DFIG) is a two input conventional induction machine which can be connected across both stator and rotor. It is used as an electrical transducer for the conversion of wind energy. An array of Solar Photovoltaic (PV) panel is utilized to translate the solar power, connected to DFIG through a common direct current bus using a boost converter. Indirect vector controls of the Rotor Side Converter (RSC) and Grid-Side Converter (GSC) is employed. Constant DC voltage is maintained using GSC and, RSC is used to operate DFIG under constant drool characteristics and any variations in voltage and frequency could be controlled. Both wind and solar energy sources incorporate Maximum Power Point Tracking (MPPT) through their control algorithms. A simulation model of 300KW solar PV array and a 2.0MW DFIG system is developed in MATLAB/Simulink environment and solar system provides 30-80kW of rotor injection power. Therefore, it decreases dependence on grid power throughout both generation and motoring action.