Analysis of Wind Driven Doubly Fed Induction Generator under Transient Conditions

The Doubly-fed induction generator is one of the most effective and frequently used wind power generation systems in the wind power industry. It offers several enticing benefits, including consistent output voltage, low cost, independent control of active and reactive power, and improved power quality. Despite any of the aforementioned advantages of DFIGs, it is precisely impacted by grid interruption. Any sudden appearance of a fault, such as symmetrical or asymmetrical faults, can cause a reduction in stator voltage, oscillations in stator and rotor currents, DC-link overvoltage, and electromagnetic torque pulsations. Such a phenomenon can considerably affect the performance of the DFIG under a transient state if an appropriate protection system is not considered. Thus, in this thesis work, the crowbar protection system is employed for the enhancement of the FRT capability of the wind turbine. The performance of the machine with the existing capacitor bank and crowbar protection is analyzed and compared. Moreover, the MATLAB/Simulink 2015a software is used for modeling and simulation and all system parameters are obtained from ADAMA-II Wind Farm.