Research On Power Generation Performance And Economy Of Large-scale Battery Modules

China proposed Carbon Neutrality at the 75th United Nations General Assembly in 2020,pointing out to achieve carbon peaking by 2030 and carbon neutrality by 2060.To achieve this goal,the conversion of old and new energy sources is the most important way.In recent years,with the continuous advancement of technology,photovoltaics has received extensive attention as an efficient and clean energy source.Under the background of reduced manufacturing costs and improved system efficiency,the large-sized cells modules have become a new trend.In this paper,a comparative study of solar cell modules of different sizes is carried out and the output performance and economic evaluation of photovoltaic modules and systems are studied from the perspective of different regions and different arrangements.The main research contents and conclusions of this paper are as follows:Firstly,the modules were studied from indoor and outdoor experiments.Relying on the Changzhou and Yinchuan experimental platforms and module tester,solar simulator and other equipments,laboratory and outdoor experiment were carried out.The laboratory experiment was to test the electrical parameters of the modules under controllable typical operating conditions.The effects of temperature and irradiance on parameters such as module voltage,current,power,and cell efficiency were studied.The outdoor experiment focused on the output results of the modules in the working environment.It could be seen from the indoor experimental results that the open-circuit voltage of the modules decreases and the short-circuit current increases and the power decreases when the temperature increases.When the irradiance increases,the open-circuit voltage,short-circuit current and output power of the components all increase.The modules power increases when the system is in the low temperature or the high irradiance.The cell efficiency will increace and then decrease with irradiance increasing and increase with decreasing temperature.It could be seen from the outdoor experimental results that compared with M6 and M10 modules,G12 modules have more advantages in generation.In Changzhou,the equivalent utilization hours of G12modules are 2%and 1.47%higher than M6 and M10 modules.The equivalent utilization hours of G12 modules are 1.19%and 1.29%higher in Yinchuan.Secondly,this study deepened the research to the system level and used the PVsyst to simulate the PV module system with different conditions.According to the local meteorological conditions and the simulation results of PVsyst software,the optimal inclination angles of the modules in Changzhou,Yinchuan and Shenyang are 25~o,40~o and 41~o.In terms of module types,the generation of G12 modules is better than M10 modules,and better than M6 modules which is consistent with outdoor experiments and PR.From the simulation results of different areas,Yinchuan has the highest power generation,followed by Shenyang,and finally Changzhou.The three areas have low power generation in June.As for installation methods,the power generation gains of modules installed in three vertical rows are 0.78%and 1.58%higher than those in vertical two rows and one row.This is mainly because the shadow shielding loss of modules arranged in three vertical rows is lower.Compared with the vertical one-row arrangement,the near occlusion loss of three-row is reduced by 1.3%.Compared with monofacial modules,bifacial modules have 5%gain in generation or so.This is mainly due to the gain in back sky scattered radiation and visual coefficient loss of bifacial modules.The power generation on the back has a small advantage.Finally,the economical evaluation of the system under various working conditions was carried out through BOS cost and LCOE.As far as different areas are concerned,the BOS cost in Changzhou area is lowest.The BOS cost is reduced by 0.036￥/W and 0.042￥/W on average compared with Shenyang and Yinchuan,but the LCOE in Yinchuan area is lowest.The LCOE decreased by 0.151￥/k Wh and 0.054￥/k Wh on average compared with Changzhou and Shenyang.In terms of modules,the BOS cost and LCOE of the G12 are lower than M10 and M6.The system BOS cost is reduced by 0.03￥/W and 0.142￥/W on average.The system LCOE cost decreased by 0.002￥/k Wh and 0.013￥/k Wh on average.In terms of different arrangements,the BOS cost and LCOE of the system with three vertical rows are lower.than one and two vertical rows.The system BOS cost is reduced by 0.23￥/W and 0.17￥/W on average.LCOE decreased by 0.021￥/k Wh and 0.006￥/k Wh on average.It can be concluded that both BOS cost and LCOE can be the economics of a PV system,there are differences in the conclusions and BOS cost focuses more on the first investment of a PV station,while the LCOE adds power generation income,operational depreciation and so on to describe the system economy from the full working cycle with more comprehensive.In this paper,the power generation and economy of different sizes of solar cell modules in different regions and different arrangements were studied by combining experiments,simulations and calculations,which had certain guiding significance for the rapid development of photovoltaic technology today.