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Ningxia University (2018)

Study on the Deposition Process of Dust on the Photovoltaic Panels and Its Impact on the Transmission of Light

牛坤;

Titre : Study on the Deposition Process of Dust on the Photovoltaic Panels and Its Impact on the Transmission of Light

Auteur : 牛坤;

Grade : Master’s Theses 2018

Université : Ningxia University

Résumé
It is very important to accurate predict the influence of dust deposition on the photovoltaic power generation system for the accurate prediction of the photovoltaic power generation and the decision of the photovoltaic panel to remove the dust deposition.In view of this,this paper systematically studied the deposition process of dust particles on the photovoltaic panels,and established a corresponding physical model,and discussed the influence of sedimentary dust on the light transmittance of photovoltaic panel protection glass.The main works are as follows:Firstly,we have set up a corresponding experimental platform to simulate a strong wind-blown sand environment.Based on it,we conducted a large number of simulation experiments to study the deposition process of dust particles on glass plates with different inclination angles.Then we discuss the collection rate of dust particles on the glass plates with different inclination angles,and analyze the relationship between the inclinations angle of plate and the particle size of dust deposited on glass plates.The experimental results show that with the increasing of the inclination angle of the plate,the collection of particles by the glass plate is continuously reduced,and the particle size of the collected dust particles is also getting smaller and smaller.Secondly,based on the incomplete elastic collision theory between elastic spheres and flat plates,we discussed the mechanical behavior of dust particles impacting the inclined flat plate.The particle size and the impact velocity all have been given a random value.Through the simulation of the sand’s motion trajectory,we reproduced the deposition process of dust particles on the inclined plate,and studied the collecting efficiency of free-settling sand dust particles by the inclined plate.In particular,we discussed the collection efficiency of dust particles at different inclination angles when the plate area and its horizontal projection area are given respectively.The results show that the collection efficiency of dust particles decreases with the increasing of the plate inclination angle while its physical area is given,but if the horizontal projection area of the plate is keep a constant,the collection efficiency basically unchanged with the increasing of the plate inclination angle.These results show that we can adjust the inclination angle of the photovoltaic panels timely to reduce the dust deposition rate,while the photovoltaic cells do not worked,or in severe dust weather.Finally,we set up an experimental platform to measure the light transmittance of the dusty glass plates.We found that with the increasing of sediment amount,the glass light transmittance became exponential decay.Based on the relevant experimental results,we used the Lambert-Beer law to establish the light transmittance prediction model of dusty glass plates.By comparing with the results reported by some literatures,the reliability of the model is verified.Based on it,we discussed the influence of the transparency,deposition density,particle size,and the shape of the deposited particles on the light transmittance of the dust-collected glass plate.This model can be used to accurately predict the degree of influence of dust particles with different properties on the photovoltaic power generation system.

Mots clés : photovoltaic power generation; dust deposition; incomplete elastic collision; light transmittance; particle size;

Présentation (CNKI)

Page publiée le 19 mai 2019