A hybrid Fuzzy PI cascade controller for transient stability improvement in DFIG wind generators
Doubly Fed Induction Generator (DFIG) Wind Turbine (WT) can be affected by power system faults and requires crowbar protection. When the crowbar is triggered, the rotor is short circuited over the crowbar impedance, the DFIG operates as a Squirrel cage Induction Generator (SCIG) that tends to drain large amount of reactive power from the grid during fault, potentially causing a voltage drop. In this research, therefore, we propose the use of DFIG based Low voltage Ride Through (LVRT) scheme including crowbar, PSS (Power System Stabilizer) RSC (Rotor side converter) and GSC (Grid side converter) in order to enhance the transient stability of a grid connected DFIG. A hybrid cascade Fuzzy PI based controlling technique is introduced to control the Insulated gate Bipolar Transistor (IGBT) based frequency converter to enhance the transient stability. In the simulations here presented, the proposed control scheme is investigated by comparing the performance of the DFIG system with and without LVRT and damping control scheme.
2016 IEEE International Conference on Fuzzy Systems (FUZZ IEEE)