Advanced protection schemes for DFIG based wind turbines during the grid faults

Abstract

Negative impacts! of the grid faults! in the Doubly Fed Induction Generators (DFIGs) based wind turbines systems include the stator and rotor over currents, DC-link over voltage, electromagnetic torque oscillations, active and reactive power fluctuations at the grid connection point, potentially leading to destabilization of the power system network. For eliminating of the negative impacts, thus enhances the DFIGs based wind turbines performance. This paper proposes a comprehensive study about the performance analysis of a 1.5 MW DFIG-based wind turbine in order to stay connected to the grid under the symmetrical and asymmetrical grid faults. This study discusses and compares the simulations of two improved protection schemes to limit the negative impacts of the grid connected faults. The investigated protection schemes are simple in construction and cost efficient. The performance of the DFIG is highly improved during the grid faults. The simulation results confirm the effectiveness of these schemes.