The Research On Solar Energy Photovoltaic Generation And Grid-Connected System

With a gradually serious problem of the global environmental pollution and energy shortages, finding a new energy source is a fact that every country has to face.It is well known that solar energy is one of the most abundant,clean,and large scale regeneration energy resources. Thereinto, Photovoltaic generate electrieity obtain more and more recognizability and attention from people. In the recent years, Photovoltaic generate electrieity grid-connected technology have become the main form of the PV technology application. Therefore, this paper introduce PV generate electrieity system detailedly.Besides that, this peper also make some correlative research about PV grid-connected control method.The research object of this paper is a complete PV grid-connected system, mostly focusing on comprehensive analysis of three-phase PV grid-conneeted systems.The main content of his paper is about research and simulation in main circuit topology of gird-connected systems, control strategies , system parameters and maximum power point tracking.Fristly, the significance and good foreground of the solar energy using is narrated, the main content of this paper is shown. After that, the component and sort of PV generate electrieity grid-connected system have been simply introduced.Secondly, the needed conditions of grid-connected and the control target of the three-phase PV generation grid-connected were presented. Trough analysising several presently popular control methods of inverter, this paper adopt current output control method, which is based on SPWM control. Building simulation models is to experiment with matlab.The simulation result prove that the control method is feasible.Besides that, the main factors of effecting ripple current are also analyzed deeply.Lastly, this paper simply analyse the theory and electrical characteristics of PV batteries. Using diagrams express several common maximum power tracking control methods. After that,this paper choose disturbance observer method to track maximum power. Using matlab software establish simulation model,and the simulation result also prove that this control method can better track the PV cells working at maximum power point. The paper also verify different effects on the track by changing the step disturbance.Finally, this paper sums up some conclusions and also gives some suggtions and prospects about PV generation grid-connected system.