The uncertainty of large-scale grid connected photovoltaic（PV）active power output increases the difficulties of power system control.The influence of large-scale PV power integration on the main system operation and control is analyzed.Considering the current status of PV stations and dispatching stations，the framework and design logic of active power control system is then proposed for large-scale PV power integration.PV data collection and communication，PV control mode for multi-objective control requirement and control performance evaluation method are studied and formulated.Furthermore，a PV integrated control system is constructed with functions of supervisory control and data acquisition，active power control，and of dispatching center and PV station.It implements closed-loop control of dispatching center to control the PV station.The proposed integrated control system has been implemented in a provincial grid and validated.