103 / 2021-06-05 22:22:15

光伏绝缘背板电荷积聚与表面形貌变化的交互影响分析

Solar energy is being paid increasing attention and are commonly deemed an ideal solution to prevent energy crisis. Photovoltaic (PV) power generation is the most common form of solar energy utilization. However, the service lifetime of PV system is usually shorter than the designed time because of accumulated charge-induced degradation of polymeric backsheet, which will accelerate the failure of components, even fire hazard of solar cells. The traditional polyethylene terephthalate (PET) backsheet cannot meet the requirements of insulation and package for the advanced solar energy system. Two different backsheet materials, namely, KPK (polyvinylidene fluoride, PET, polyvinylidene fluoride) and TPT (polyvinyl fluoride, PET, polyvinyl fluoride) are used as backsheets to provide electrical insulation and physical protection. In this context, KPK and TPT backsheets are used to explore accumulated charge induced degradation caused by partial discharge (PD) and corona discharge. The accumulation and transportation of charges were investigated by phase-resolved partial discharge (PRPD) and surface potential decay (SPD). The topography of KPK and TPT is also explored by atomic force microscopy (AFM). The results showed that KPK and TPT have a similar PD resistance, but their SPD were entirely different after corona discharge. This works provide an important reference to investigate the aging process of insulating polymers, as well as the experimental basic for development of the future PV module.