Optimal Design Of Mountain-to-Earth Photovoltaic Power Generation System Research On Grid-connected Scheme

In today's society,with the continuous development of the world's industrial level,the consumption of fossil energy is gradually increasing,and the unscientific power structure hinders the sustainable development of the power industry.As a result,the world energy crisis has become serious.Actively developing low-carbon,energy-saving and clean renewable energy should be placed in the prominent position of China's energy development.With the strong support of national policy,solar energy resources as a very rich new green energy are being actively exploited and utilized by us,and the technology of solar power generation is becoming more and more mature.Therefore,rational use of this resource is the only way to solve the energy crisis.Based on a 20 MWp solar power project in Western Liaoning,this thesis studies the optimization design and grid-connected system of mountain photovoltaic power generation system.Firstly,in the introduction part,photovoltaic power generation will be introduced,including: the development history of photovoltaic industry at home and abroad,focusing on the research status of photovoltaic industry at home;the development status of photovoltaic power plants,where domestic and foreign development is compared,showing the difference between domestic and foreign photovoltaic power generation;photovoltaic grid-connected status,the main research significance of this thesis is briefly analyzed.Then,the software Meteonorm for meteorological information analysis is introduced.this thesis chooses western Liaoning as the site of photovoltaic power plant project.The analysis of different environmental impact factors on photovoltaic power generation proves that the fitting effect of the meteorological software and the real value is better.By using PVsyst to analyze the tilt angle of photovoltaic array,39 and eastward 3 are selected as the best.Through the comparative analysis of photovoltaic model and inverter model,the vertical two-line is selected as the most suitable placement mode of photovoltaic module.The project is modeled and analyzed in 3D by PVsyst.The theoretical and actual power generation are compared.The actual power generation is lower than the theoretical power generation,and the causes are analyzed.Finally,the optimized photovoltaic power station is built into the grid,and two grid-connected schemes are proposed.One is directly connected to the large-scale system through the newly-built line "T",the other is connected to the nearest substation through the newly-built line.After research and analysis,the first one is selected.After ETAP power flow analysis of photovoltaic power station before and after grid-connected,it is proved that the proposed scheme can absorb the power generation of photovoltaic power station in situ,and the grid-connected voltage is in line with the national standard,which is correct and effective.