Review on dust depositing on PV module and cleaning techniques

BAO Guan-jun1， ZHANG Lin-wei1， CAI Shi-bo1， JIANG Jian-dong1， XV Fang1， JIA Gui-hong2
（1. Key Laboratory of E&M， Ministry of Education & Zhejiang Province， Zhejiang University of Technology，Hangzhou 310032， China；
2. College of Mechanical Engineering， North China Electric Power University， Baoding 071003， China）

Abstract： Aiming at the problems of PV module dust depositing，affecting factors，the reducing effect on conversion efficiency，the related researches were overviewed and the main researching aspects in the future were proposed. The source and components of dust were introduced. Research documents about the PV module dust depositing process and the PV efficiency decline or solar radiation transmittance decline caused by dust depositing were emphasized and reviewed. The main factors of module angle，wind speed and orientation，dust property，environment humidity，which will influence the dust depositing，PV efficiency and solar radiation transmittance，were analyzed. The dust depositing model and its impacting model on PV efficency from the perspective of dust property，dust falling and raining were summarized. The commonly used PV module cleaning techniques，that is electrode screen dust mitigation and mechanical dust cleaning，were introduced. Finally，the shortages of present research were abstracted and the main research aspects in the future，such as the integrality of the dust depositing experiment，dust characteristics，dust depositing mechanism and PV panel cleaning techniques，were pointed out.
Key words： PV module； dust depositing model； cleaning technique