The emulation research of Phtotovoltaic grid-connected invert sysem

Grid-connected photovoltaic(PV) system is the trend of photovoltaic system’s development.Single-State grid-connected photovoltaic system has advantage such as simple topology,low cost,ect.This system has only one stage of power conversion and all control objectives need to be considered. This paper introduces the topology and MPPT’s principle of single-state PV system,as well as illuminates the basic principle of MPPT realized by conductance increment method.According to the topology of the PV system,a nevel single-state PV inverter is designed.The inverter is of MPPT and export current tracking and synchronization with the utility and operation at high power factor based on DSP .Simulink result illustrates single-state grid-connected PV system can realize MPPT accurately,also shows the high stability and high efficiedty.