Low voltage ride-through control for fixed speed wind generators under grid unbalanced fault

As the wind power penetration in the power system is increasing rapidly, new grid connection codes for wind turbines are established. Low voltage ride through (LVRT) ability of wind turbines is required in order to ensure the voltage stability of the power system and improve the stability of wind generators. The characteristics of the fixed speed wind generators are described, and a new topology based on TSC for fixed speed induction wind generator LVRT capability and its control principle are proposed in this paper. Comparisons of the wind turbine transient performances equipped with and without the LVRT topology during and after the grid unbalanced fault are evaluated. Simulation results have been presented, and the ability of enhancing the system stability together with the effectiveness and validity of the proposed method with LVRT topology are proved.