As the trend thata large number of access of distributed PV power into distribution grid

the influence of PV power on the voltage distribution of distribution grid and the sensitivity of inverter output power to voltage of grid-connected point is analyzed.A kind of selective control strategy of local voltage by the use of theresidual capacity of the PV inverter is proposed for the overhead line distribution grid.In case of normal voltage at the grid-connected point

the PV inverter operates at MPPT mode under unit power factor.When the voltage of the grid-connected point is above the upper limit

the overvoltage regulator operates at reactive power mode in priority mode.The PV inverter outputs the inductive reactive power needed for suppressing the overvoltage

then outputs as much as possible active power in accordance with the remaining capacity of the inverter.When the voltage of networking is lower than the lower limit

the low voltage regulator operates at active mode in priority.The PV inverter outputs active power of MPPT mode at first

then outputs corresponding capacitive reactive power in accordance with the need of low voltage improvement and the limit of the remaining capacity of the inverter.It is shown by the simulation and experimental result that this kind of local voltage control strategy can fully use PV energy under premises of assuring qualified grid voltage.