Research On Single Phase Photovoltaic Grid Connected Power Generation System

As an inexhaustible clean and renewable energy,the solar energy has been successfully applied to people's daily life.The solar energy gradually get people's attention due to its popularity and widely used Among them,as the development of new energy technology,the solar photovoltaic power generation technology is paid more and more attention and development.In this paper,the single phase photovoltaic grid connected power generation technology is researched.First of all,the topology structure of single-phase photovoltaic grid connected system is analyzed,using two levels of energy structure.The first level DC-DC circuit uses BOOST circuit,after using DC-AC inverter circuit.Secondly,the basic mathematical model of photovoltaic cells and the basic working principle is researched.It analysis the temperature and light influence on its working performance and studies the maximum power point tracking technology.The improved MPPT algorithm is proposed.And then we make the study on control strategy for the inverter circuit.The outer voltage loop feedforward control and current inner loop control is adopted.And it realizes the same frequency and phase AC power between the DC side voltage and the grid voltage.Meanwhile it also studied on the technology of PLL.It realize the same frequency and phase by SPLL.Finally,in view of the single-phase photovoltaic inverter control system,the model of the system simulation is built by MATLAB/Simulink tools.Simulation shows that the system realizes the output current and voltage in the same frequency and phase.