Considering the regulating performance of multiple reactive power sources

a reactive power and voltage coordinated control strategy which comprehensively utilizes the static var generator(SVG)

photovoltaic inverters and capacitors is presented

with two control stages involved. The first stage is coordinated voltage control considering multiple reactive power sources

which maximizes the use of reactive power sources

so as to reduce switching frequency of capacitors

and quickly responds to the change in system reactive power

while maintaining voltage stability at the point of common coupling. The second stage consists in dynamic reactive power optimization control

through the replacement of dynamic reactive power(static var generator)with static reactive power(capacitors)

and fast reactive power(static var generator)with slow reactive power(photovoltaic inverters). The SVG retains sufficient reactive margin

to make the power grid more capable of surmounting the problem of voltage collapse. Finally

the reactive power and voltage control strategy is applied in actual photovoltaic power stations to verify the strategy.