Direct-driven permanent magnet wind generator has broad prospects in the high power wind power market thanks to such advantages as strong reactive power regulation capacity and high operating efficiency.For solving the problem of reactive power support for direct-driven wind farms in power grid fault

in this paper the control strategy of GSC on the basis of analyzing the reactive power regulation capability of wind generator is designed

and a reactive power coordinated control strategy between STATCOM and wind generator is proposed.When the voltage variation amplitude is less than the set threshold

only STATCOM is used for reactive power support and the converter of the grid side operates in the unit power factor mode.In case of exceeding the set threshold

the operation status of thewind generator is switched so to coordinate and distribute the reactive need between them and the reactive power adjustment ability of the wind generator is in priority use.The different reactive power channel is selected with combining the reactive power adjustable capacity of inverter of the grid side for the fast reactive power support.The energy storage system on DC side controls the DC voltage in allowable range.The control strategy improves the voltage stability of PCC and reactive power margin of wind farm and the results shows that the control strategy is effective.