Research on the grid-connected PV power station

Based on the theory of controlled source and on the assumption that the input/output variables of all AC devices in the PV station are pure sine functions, a method to simulate the operation characteristics of PV station´s power conversion and transmission system is proposed. Phasor analysis and controllable power source theory are applied in the proposed method for the first time. Then a whole mathematic model that can effectively simulate the operation characteristics of the grid-connected photovoltaic system is developed and the model includes a steady model and a dynamic model of PV array, inverter with MPPT function, transformer and control system. In order to show the validity and veracity of the model, some collecting and testing datum from a practice system that is yangbajing 100 kWp PV generation station are compared with simulation datum. The result shows the dynamic model of PV generation station is correct and available.