Reactive power optimization and coordinated control method for offshore wind power system

The invention provides a reactive power optimization and coordinated control method for an offshore wind power system. The method comprises the steps that a reactive power voltage regulation constraint condition is determined, and correcting is carried out according to the constraint condition; the measured value of the alternating current bus voltage of the VSC-HVDC wind farm side is subtracted from reference voltage, and the difference is input to a PI regulator to acquire the required reactive power compensation amount zref; the alternating current bus voltage on the wind farm side is compared with nominal voltage; and fast voltage emergency control, long time scale voltage control or the combination of fast voltage emergency control and long time scale control are carried out accordingto the relationship between the alternating current bus voltage on the wind farm side and the nominal voltage. The method provided by the invention has the advantages that the fast voltage regulationcharacteristic of WFVSC i