Study Of Crystalline Silicon Photovoltaic Module Incident Angle Modifier

Photovoltaics(PV)have been regarded as one of the most promising forms of new energy,because of the characteristics of green,quiet,sustainable and low cost.It is an effective approach to directly convert light energy into electrical energy without mechanical energy transfer.With the help of technological upgrading and scale effect,the cost of PV power is expected to fall below the cost of thermal power in recent years.PV is becoming the most competitive energy source for global electricity.In the past few years,the PV industry has no longer followed the early extensive mode of development,and is turning to a more and more complex and finer mode,with an aim of constantly exploring they potential of photoelectric conversion efficiency.At the same time,customers are becoming more and more professional,and their requirements for systems and equipment are gradually increasing.The analysis of the refinement characteristics of photovoltaic modules has become a hot research topic.Among the various types of PV power generation factors,the loss from the change of the incident angle and the difference in the loss of the incident angle when the materials with different optical properties are maybe the most easily overlooked.By analyzing the research direction and foundation of the predecessors,this thesis explores the difference between the relative efficiency of photoelectric conversion at different incident angles from experimental test to theoretical analysis and simulation,and introduces a comparison of the power generation simulation at the power station level.Analytical route was fulfilled in parallel with simulation means.This work can give a guideline for selection of encapsulation materials(i.e.,glass coating,PV glass panel and EVA film),which is practically meaningful.The main contents of this thesis include the following three parts.(1)To determinate the incident angle modifier(IAM),the main test routes are carried out and compared.For the two indoor machines together with the outdoor test platform based on the two-axis solar tracker,the designed materials and the sample combinations are settled to compare the test data.Uncertainty analysis for indoor controllable environment testing was evaluated.Under the premise of selecting the anti-reflection film materials with similar refractive index(between 1.30 and 1.40)and step-grading,the results of the test routes are compared and the route-selection judgment is discussed.(2)In order to improve the analysis ability and prediction ability of the IAM,an attempt was made to establish a set of tool,which includes inputting optical parameters in the spectral range from 300 nm to 1400 nm,and outputting simulation based IAM forecast result.By establishing an optical layer system,one can analyze the optical reflection and absorption loss of the surface of the photovoltaic module,and can evaluate the status of the light through the glass layers(including the solar silicon nitride anti-reflective coating and the cell passivation layer)and exiting into the P-type crystal with the conditions of different incident angles.EQE in the full spectrum of the silicon body and the effective light irradiation at the full incidence angle are used to assess the photoelectric conversion performance.The comparison shows that the simulation results have a good agreement with the measured results under the selection of the machine with high guaranteed accuracy.(3)Combining the in-field test and simulations,the data accounting rationality of the traditional IAM models(including Sandia model,Martin&Ruiz model and ASHRAE model)is analyzed.Finally,with the help of the output of the situational power generation,the evaluation and judgment of the IAM impact on the application side of the income in a specific typical non-extreme application scenario,the difference may reach about 0.6%for the annual output.In order to ensure the maximum benefit,it is valuable to optimize the optical matching by using the proposed simulation method when the application site and installation method is needed to be determined.