Seamless Transfer For Operation Mode Of Grid-connected PV System Based On Virtual Synchronous Generator

At this stage due to the shortage of energy,it is particularly important to study the distributed generation system.But in distributed power,photovoltaic power generation because of its clean and efficient characteristics was widespread concern.In grid connected PV system,seamless switching between grid and island is one of the focus of the study.Aiming at the problems of photovoltaic switch access to relevant literature at home and abroad,a lot of research.Put forward a kind of photovoltaic grid connected control strategy based on virtual generator,so that the photovoltaic power generation system can operate in grid connected with the switching process.The main research contents of this paper are as follows:(1)this paper by reading a lot of literatures,a detailed analysis of the photovoltaic power generation of the domestic and foreign research present situation,and on the basis of a detailed analysis of the basic principle of photovoltaic power generation,the mathematical model of the photovoltaic cell is analyzed in detail,and describes the basic principle of the photovoltaic power generation system.(2)this paper proposes a virtual grid connected photovoltaic generator control strategy based on the traditional control strategy of photovoltaic grid connected with virtual synchronous generator control model,so that the photovoltaic power generation system in the grid,and grid and off grid off grid before switching has stability,and the simulation results show that this control strategy effectively effective.(3)on the basis of the design control strategy,this paper designs the corresponding hardware system for the control strategy of the grid connected PV system.