Analysis and design of enhanced real and reactive power control schemes for grid connected Doubly Fed Induction Generator

Rapid reactive power control for Doubly Fed Induction Generator (DFIG) is necessary for stable operation during voltage control and grid fault conditions. This paper examines the performance of DFIG under three cases viz., i) generator speed, ii) reactive power demand from grid and iii) wind speed. Based on the above disturbances, the system performance is analyzed by considering the parameters like rotor speed, generator torque, stator and rotor voltages and powers. It is also aims to explain DFIG as a vital dynamic reactive power source without the use of any additional external reactive power devices. The simulation results illustrate the efficacy and robustness of torque, speed and stator reactive power control for DFIG system by the proposed methodology. The torque surges are minimum even there is sudden change in wind speed, torque ripples and speed surges are not there when there is sudden change in wind speed.