Research on Adjustable Bracket in Bifacial Photovoltaic System
CHEN Jian-guo1, ZHU Ya-wen2, HONG Ling3
1. Suzhou Zhongkang Electric Power Operation and Maintenance Co., Ltd., Zhangjiagang 215600, Jiangsu, China; 2. Jiangsu Sumec Energy Holding Co., Ltd., Nanjing 210000, China; 3. Key Laboratory of Solar Energy Utilization & Energy Saving Technology of Zhejiang Province, Zhejiang Energy Group R&D Institute Co., Ltd., Hangzhou 311121, China
Abstract：Based on bifacial PV module and adjustable mounting system, taking Geermu in Qinghai Province as the simulation site, the differences of solar radiance of modules, yearly power generation and system revenue between adjustable support system and fixed support system under different adjustment times were analyzed by using PVsyst photovoltaic simulation software. Results showed that, the height of the lowest point of PV module was changed by the angle of PV module, so the irradiation of front and rear side was directly affected. The distance between the two arrays affected the ground-coverage-ratio (GCR), when the GCR was reduced, the back side irradiance and the total energy yield of the module increased. Compared with the fixed bracket bifacial power generation system, the annual back irradiation of the module under different adjustment method were decreased, while the overall energy yield increased due to the increasing of front side irradiation, up to 4.8%. Technical and economic analysis showed that, for the bifacial module system, the economic benefits during its 25 year life cycle was the best when adjusting twice a year. Moreover, a comparison was made between monofacial and bifacial module system, the economic benefits of the bifacial module system was higher than the monofacial ones under the same adjustment times. The results can provide reference for designing of adjustable bracket bifacial system.
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2020, Vol. 8 
