Notice of Retraction Control technique on output power quality for doubly fed wind power system

Considering the problem of low order current harmonics (5th, 7th and so on) caused by the distortion or unbalanced grid voltage conditions and the variations of generator itself parameters, an improved control strategy for harmonics restraint of double-fed wind power system is proposed in this paper. To eliminate the rotor current harmonics, restrain the stator current harmonics indirectly, and thus improve power quality of wind turbines, one control strategy of proportional integral (PI) regulator paralleled with a harmonic resonant (R) controller in the synchronous reference frame is simulated, which has not effect on the control of fundamental current, and need not the harmonic separation filter and the sequence decomposition in multi reference frames. Simulation analysis is studied based on Matlab/Simulink for the proof of the control strategy effectiveness, which shows that the control strategy proposed in this paper could improve power quality effectively and it is easy to implement digital control.