Research On Algorithms Of Single Axis Photovoltaic Tracking System Based On Adaptive Support Parameters

The development and utilization of energy are indispensable to human survival and development.Under the background of increasing depletion of fossil energy and environmental pollution,clean and renewable new energy represented by photovoltaic power generation is becoming more and more important in China’s energy structure.With the advent of the era of photovoltaic parity,the use of photovoltaic tracking system has become the best choice for many new large-capacity power plants.Firstly,the development background of photovoltaic tracking system and the research situation at home and abroad are investigated.At the same time,the advantages and disadvantages of the three tracking strategies of the system,i.e.the sun-looking trajectory method,photoelectric sensor method and hybrid method,are compared.A single-axis photovoltaic tracking system using the sun-looking trajectory method is selected as the research object.Under the above background,this paper further explores the solar trajectory and illumination radiation model.Taking the actual project as an example,using Pvsyst software to compare the annual power generation of the system with or without the tracking device,and verify the economic benefits brought by the tracking device.Because there are three kinds of tracking algorithms for photovoltaic system,i.e.solar time angle tracking,azimuth angle tracking and new tracking algorithms proposed by some scholars,this paper simulates and analyses the influence of these three tracking algorithms on the power generation of the system on the premise of precise modeling and experimental verification of the tracking system bracket and solar incident light,and obtains a new tracking algorithm.The conclusion of the best performance of the algorithm.On this basis,the local shadow occlusion problem of photovoltaic tracking system generated by the new tracking algorithm is studied,and the existing anti-shadow tracking algorithm is elaborated and analyzed,which proves that the support parameters of each system in the tracking array are inconsistent and can not be used.Based on this,an algorithm of single-axis photovoltaic tracking system based on adaptive support parameters is proposed in this paper.During the derivation of the algorithm,the mathematical model of the tracking bracket and the ground shadow distribution of the system is established.At the same time,the shadowless criterion is introduced based on the plane geometry knowledge,and the tracking angle of each system is solved by genetic algorithm.Finally,the algorithm is validated by a tracking array in a photovoltaic tracking power plant.