Author : Beshoy Abdou Aziz, Maged N. F. Nashed, Salah G. Ramdan and Tarek A. Dkrori

This paper investigates the dynamic behavior of wind farm based on DFIG wind turbines during three phase to ground fault at wind farm terminals using different types of protection. Also, it schemes to improve fault ride through (FRT) capability for keeping the machine connected to the grid during fault period without destroying the machine, which is important to avoid a cascading effect due to lack of power and instability of the system. First, the system is tested using only crowbar protection scheme with varying of its resistance, then using only DC-chopper with different values of its resistance. Finally, the system is evaluated using both crowbar and DC-chopper. The transient behavior of DC-link voltage, electromagnetic torque, reactive power, stator voltage and rotor speed during fault is evaluated and compared with proposed types of protection schemes.

Keywords: Crowbar, DC-chopper, Doubly fed induction generator (DFIG), Fault ride-through (FRT), Rotor current, Electromagnetic torque, Reactive power.

Article published in International Journal of Current Engineering and Technology, Vol.5, No.4 (Aug-2015)