Active output control system and method of photovoltaic power station

The invention provides an active output control system and method of a photovoltaic power station. The active output control system comprises a photovoltaic power generation unit, an energy storage unit, a first voltage detector, a second voltage detector and a controller; the energy storage system and at least one photovoltaic power generation unit are connected to an AC bus in parallel, the first voltage detector is arranged at a photovoltaic grid-connected site and is used for measuring the voltage UPV of a grid connection of the photovoltaic power station, and the second voltage detector is arranged at an output end of the energy storage unit and is used for obtaining a DC side voltage (the formula is described in the specification) of the energy storage unit; and the controller determines the SOC of the energy storage unit and the power demand Pt of the grid, and controls active output of the photovoltaic power generation unit according to the determined SOC of the energy storageunit and the power demand