BEHAVIOUR OF VECTOR CONTROLLED DFIG BASED LOW VOLTAGE WECS AT VARIOUS WIND SPEEDS

The ever-increasing demand of Electricity necessitates the establishment of new generating stations. Shrinkage of Fossil Fuel and strict environmental regulations enforce us to explore various alternative options of generation. Wind power is becoming more attractive due to its mature and clean aspects. DFIG based WECS are becoming popular as these systems offer high controllability, allow maximum power extraction and individual control of active and reactive power components using back to back power converters of reduced rating. In this paper, the behaviour of WECS with vector controlled DFIG; feeding ac power to distribution system is studied under varying wind velocity conditions. The stator of DFIG is connected directly to the grid while the rotor is fed to the grid through two voltage source converters connected back to back with a common DC link. The system is simulated for better power quality and the system is capable of harnessing maximum power at various wind velocities. The system is simulated in MATLAB Simulink environment