Controlled strategy research for low voltage ride-through of DFIG

At present, doubly-fed induction generators (DFIG) account for a large proportion of most variable-speed wind power plants, so its research is relatively extensive. Because DFIG is very sensitive to grid voltage drop faults, the fault causes the wind generators 's over-current and brings great damage to itself. This paper focuses on Low voltage ride- through (LVRT) capability of DFIG in the grid voltage drop from 0.2 to 0.9pu. This paper proposed the controlled strategy of reactive current and power compensation obtained by real- time calculation to meet the requirements of wind turbine operation during the grid voltage drop. The compensation effects of the proposed method are verified by MATLAB/SIMULINK simulation. The results show that the proposed control method has a better effect on the LVRT process.