Effect of wind turbines equipped with doubly-fed induction generators on distance protection

Nowadays wind energy is the fastest growing renewable energy resource in the world. The problems that arise in integrating such wind farms are because of change in wind speed during a day. Moreover, the behavior of wind turbines equipped with doubly-fed induction generator differs fundamentally from synchronous generators. Therefore, more considerations are needed to analyze the performance of the distance protection relays. In this paper the protection of such a wind farm with distance relay is inspected. Conditions of the wind farm are changed and the ideal trip characteristic of distance relay is studied.