In photovoltaic (PV) power plants

different types of reactive power sources exhibit significant differences in compensation capacity and response speed. How to coordinate these reactive sources to enhance the plant’s active voltage support and resistance to voltage disturbances has become a key issue. To address this

a two-stage coordinated optimization control strategy is proposed for PV power plants

aimed at improving active voltage support and disturbance rejection capability. First

during the active voltage support stage

a dynamic reactive power demand correction method is introduced

which dynamically adjusts the reactive power demand based on the Q-V relationship and coordinates dynamic reactive power sources to rapidly support the voltage at the point of common coupling. Then

during the disturbance rejection enhancement stage

a progressive capacitor bank switching strategy is proposed to gradually replace the output of the static var generators

thereby improving its reactive power reserve and enhancing the plant’s ability to withstand voltage disturbances. Finally

simulation results based on a grid-connected PV power plant demonstrate its superior voltage support

disturbance rejection

and economic performance compared to adaptive droop control and multi-reactive- source control methods.