The inductive filtering technology is adopted to realization of harmonic suppression in wind farm. An inductive filtering winding with zero equivalent impedance and reactive power compensation is added to the converter transformer

and a harmonic short circuit loop is constituted with external fully tuned filter branches. It has good effect of harmonic suppression. Aiming at the problem of reactive voltage fluctuation

a optimization control strategy of AVC system

which is mainly based on the reactive power output of wind turbine and supplemented by the output of SVG is proposed. The reactive power capacity of wind farm can be increased by more than three times

which greatly improves the reactive voltage regulation of the wind farm. The wind farm operation test shows that harmonic problem is fundamentally suppressed and the reactive voltage is well controlled.