Abstract:

With the standards of wind power in China are published, all the doubly-fed induction generator （DFIG） wind turbines manufacturers in China are equipped with low voltage ride through（LVRT） ability. But some of the wind turbines are born with LVRT ability, the others are reformed by the manufacturers. So that the LVRT strategies of different wind turbines are all unlike, which make some of control strategies of wind turbines are not perfect, so that these turbines cannot meet the requires of recover power rate after the low voltage fault. In the same time, some control strategies of wind turbines may cause power saltation condition. If lots of wind turbines in a wind farm all use this strategy to proceed the LVRT, the voltage of this area will increase suddenly because of the power saltation, which will bring a secondary impact to the grid, and cause the wind turbines of this area into voltage-overtop status. But the wind turbines in China are not equipped with high voltage ride through（HVRT） ability, so that it will result in more wind turbines out of work. This paper proposed an elaborate control strategy for DFIG, which could both protect the crowbar system and get LVRT application.

Key words: low voltage ride through, crowbar, control strategy, doubly-fed induction generator