Correlation Analysis Of Photovoltaic Generation Efficiency And Meteorological Factors

Energy is the cornerstone of human survival and development. As the clean energy of renewable energy, solar energy can be used unrestrictedly. Solar power generation is clean and environmental-friendly. It will not produce carbon dioxide and other greenhouse gases in the power generation process. In the process of producing energy, it will not damage and pollute the environment. In a specified PV power station, the model, physical characteristics and installation mode of the PV battery set is determined, so the generated output mainly depends on the external conditions, that is, meteorological factors. Due to various types, quantity of meteorological factors, and varied degree of the effect, it is complicated and changeable to forecast the generation power of photovoltaic plant. In order to increase the precision of forecast, the in-depth analysis on the relationship between generated output and meteorological factors is required. Grid connected power generation is the main form of photovoltaic generation, so this research has practical significance for promoting the application of photovoltaic generation technology.The research object of the paper is 2.1MW grid-connected photovoltaic generation system in a school. In this paper, the application status of solar photovoltaic technology, type and principle of photovoltaic generation system, development process, classification of solar cells, its power generation principle, etc. And analyzed this system: including the basic introduction of the PV module type, specification, quantity and tracking, junction box, inverter requirements and function etc. The 2.1MW grid-connected photovoltaic generation system in a school centralizes a variety of types of PV modules in one. Its PV array adopt four kinds of PV cells made of different materials: monocrystalline silicon, polycrystalline silicon, amorphous silicon thin film and high concentrated gallium arsenide, in order to make comparison of generating capacity of different cells. Photovoltaic generation system uses fixed installation, flat single-axis tracking, oblique single-axis tracking and double-axis tracking, a total of four kinds of tracking mode. By comparison of generating capacity of different PV arrays under the same environmental conditions as well as generating capacity of the same PV array under different tracking modes, PV module type with relatively high power generation efficiency in the region and the best way to track are obtained. In addition, monitoring data of generating capacity of 2.1MW grid-connected photovoltaic generation system of a school in 12 months are analyzed theoretically. Use gray correlation method to do trend analysis. Use analysis method of information entropy theory to do quantitative study of relevance between meteorological impact factors and photovoltaic generation efficiency, use statistical correlation analysis of mathematical statistics theory to do quantization measurement between meteorological impact factors and photovoltaic generation efficiency factors, to explore relevance between weather types and photovoltaic efficiency, and conduct preliminary study of the impact of weather type on photovoltaic power generation efficiency. This study, through comparison, obtained components with relatively high power generation and their operating mode, has practical guiding significance for completion of the grid-connected PV system, can also provide basis and reference for construction of photovoltaic power plant in the region.