Photovoltaic System Optimal Tilted Angle And Radiation Intensity Prediction

With the growing energy demand,countries around the world face the challenges of energy shortage and environmental pollution.Solar energy has a wide range of distribution,pollution and other characteristics,has been more and more attention,many countries will be regarded as an important future energy development research direction.Photovoltaic grid-connected inverter and other key equipment of the localization,so that PV applications become a trend,and photovoltaic power plant output power by the solar radiation intensity and climatic conditions,with amplitude changes,attenuation disorder,affected by climate Large and other defects.Accurate calculation of the best tilt angle and predict the radiation intensity of the PV array is conducive to the development of photovoltaic power grid corresponding to the energy management program to reduce the probability of the impact of the grid to make it more stable and safe operation,of great significance.In this paper,the optimal tilt angle of photovoltaic power generation system and short-term prediction technology based on radiation intensity of weather clustering are studied.Firstly,the astronomical model of solar radiation intensity is established.The calculation process of ground radiation intensity of PV array is described,and the prediction technique of instantaneous,time-by-day and weather-based radiation intensity is studied.The prediction model of the traditional prediction model is optimized,and the radiation intensity prediction model based on weather clustering is proposed.The prediction accuracy of the radiation intensity model is high under different weather types.Secondly,the calculation model of the optimal tilt angle of PV array is studied,and the PV array cell model and multi-objective decision model are studied.This paper analyzes three commonly used tilt angle calculation models,such as proportional analysis method,empirical formula method and point by point comparison method,and puts forward the optimal tilt angle calculation model of PV array based on multi-objective decision model.This paper introduces the use of target satisfaction function and target global coordination function,and establishes three decision models such as decision-making target model,decision-making and satisfaction model and target satisfaction model.Finally,the calculation of the optimal tilt angle of PV array is completed.Finally,the calculation of the optimal tilt angle of the PV array based on the prediction of the radiation intensity model and the multi-objective decision model based on weather clustering are realized respectively.The experimental data are from the historical database of distributed photovoltaic power stations in Guilin University of Science and Technology.The results of radiation intensity prediction show that the weather clustering model is more adaptable,more accurate and less error than the traditional sunny model and RLS model.The results of the best inclination angle show that the optimal angle of inclination calculated by the multi-objective decision model is more than that of the traditional empirical formula method,the proportional analysis method and the point-by-point comparison method,which provides a certain optimal installation angle for the PV The value of scientific research.