Research On Grid-connected PV Inverter System

The continued popularity of the scope of modern society solar power more and more widely, solar energy utilization rate is getting higher and higher, solar photovoltaic power plant generating capacity increase, improve the efficiency of the photovoltaic power generation electronic.Photovoltaic power generation system, vigorously develop clean energy as a great significance for environmental protection and use of renewable resources.In order to make photovoltaic power generation system to the maximum power output and high-quality sinusoidal current input grid reduce the pollution of the grid of photovoltaic grid inverter The maximum power point tracking have very important significance. Designed1KW single phase photovoltaic grid-connected inverter.The main content is as follows.1.Analysis of existing photovoltaic grid-connected inverter main circuit topology, transformer insulation two topological circuit program, analysis of pre-Boost circuit and the stage full-bridge inverter circuit works.2. Analysis of a solar cell works, to build a solar cell based on the equivalent circuit of the solar,and solar cells to power under different light and temperature.,, compared the advantages and disadvantages of several commonly used, the maximum power point tracking-analysis of the reasons to cause the system to an error of judgment.Incremental conductance method maximum power point tracking algorithm, the system simulation,the simulation results show that the maximum power point of the method can be very good tracking PV systems3.The commonly used inverter control strategies and photovoltaic grid-connected inverter works, given the method of calculation of the circuit elements comparison of several control, selection of the SPWM dual closed-loop control and system simulation.Analysis of the deficiencies of the system.4. On the basis of the analysis and research, simulation model to establish the1KW individual PV, And calculate the parameters of the system components, The establishment of a system simulation model.The simulation results show that the system better to complete the design.