Harmonic Research and Inhibit Strategy of Variable Speed Constant Frequency Wind Power System

Because of wind power systems doubly-fed generators mostly adopts the hand over,the rotor voltage not only contains base wave voltage of slip frequency,but also contains a lot of zero sequence,positive sequence and negative sequence harmonic component.Through researching electricity harmonic which is created in wind power system of hand over inverter excitation,and calculating the base wave voltage components and the base wave,harmonic current,torque,power and loss,etc,which is caused by positive and negative sequence harmonic voltage component.And three kinds of the harmonic inhibit strategy in the power system further is given.Though analyses,one of the most reasonable harmonic control strategy should be choosen in the aspect of the rotor,with using the side of active and passive filter.