In view of involved voltage stability problem when the present PV station is connected to the power grid

a kind of reactive power voltage control strategy with comprehensive consideration of both the static disturbance and transient fault of the grid is proposed on the basis of study of the reactive power output capacity of PV inverter and the influence feature of reactive power voltage of the control point.The voltage is divided into both static and transient control area.The corresponding reactive power optimization proposal is adopted as per the active power output of the PV unit and the area where the voltage of the control point is located

so to achieve coordination distribution of the reactive power between PV power station and the reactive compensation device and between each inverters in the PV power station.The static voltage fluctuation due to illumination intensity and the transient voltage sag due to three-phase fault of power grid before and after adoption of the strategy are simulated.It is shown by the simulation result that the system at static or transient after adoption of the control strategy can provide fairly good voltage support role

suppress effectively voltage fluctuation and fault form the power grid and it is proved that the voltage control strategy has good effectiveness and economic results.