Using of the doubly fed induction generators (DFIG) in modern variable-speed wind turbines
increased rapidly. According to the new grid code requirements, wind turbines generators must
remain connected to the grid during grid disturbances so protections systems is being used to
protect the DFIG. This paper introduces a new proposed protection method which is named the
outer crowbar protection. Operation and dynamic behavior of the outer crowbar protection with
the DFIG during grid fault will be illustrated in this paper, this paper also introduces strategy of
choice the optimum value of the outer crowbar resistance which achieves the stable
performance of the DFIG during the grid.