Power control of Doubly Fed Induction Generator (DFIG) using back to back converters (PWM technique)

In recent years there has been a lot of emphasis on the use of renewable sources of energy particularly, wind energy. There is use of Doubly Fed Induction Generator (DFIG) in case of wind generation. Voltage stability is one of the main issue to have uninterrupted operation of wind turbine with DFIG during grid faults. These wind plants are required to have grid right through capabilities. Active and Reactive power generation can be controlled by changing various parameters such as speed, frequency, voltage of DFIG based wind turbine. In Simpowersystem, Simulink tool is used to analyze the different operating conditions in the performance of DFIG. Modeling and simulation of induction machine using vector control computing technique is done in MATLAB/SIMULINK platform. In this paper, on the rotor side of DFIG fluctuations in torque, rotor speed, stator current and rotor current are analyzed. On the contrary the grid side converter variation in active and reactive power is seen along with voltage source and current source. After the clearance of fault, the control scheme manages to restore the DFIG normal operation.