Intelligent control system and method of photovoltaic grid-connected power station

The invention relates to an intelligent control system and a method of a photovoltaic grid-connected power station, the system comprises a plurality of groups of photovoltaic arrays, an inverter and a load, wherein the plurality of the groups of the photovoltaic arrays are connected with the input side of the inverter; the system is characterized by further comprising a first current transformer, the primary side is connected with the output side of the inverter, and the secondary side is connected with the input end of a first current transducer; the output end of the first current transducer is connected with a central controller PLC; the system further comprises a second current transformer, the primary side is connected with the total input side of the load, and the secondary side is connected with the input end of a second current transducer; the output end of the second current transducer is connected with the central controller PLC; the system also comprises a plurality of direct current contactors which correspond to the photovoltaic arrays in a one-to-one manner; and the input end of the each direct current contactor is corresponding connected with the control signal output end of the central controller PLC through a control device, and the output end of each direct current contactor is connected between the corresponding photovoltaic array and the input side of the inverter. The system and the method can realize the detection and the real-time control of photovoltaic power generation and prevent the counterflow of electrical quantity to an alternating current power grid under the premise of leading the power generation to meet the use of the load.