Performance deterioration behavior of photovoltaic cells subjected to massive-particles impact environment
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摘要: 光伏电池由于具有较高的光电转化效率,在沙漠等太阳能充足的地方被广泛应用。但在沙尘长期冲击的环境下,光伏电池内部结构易出现累积损伤,使光电转化效率大幅降低。因此,研究颗粒群冲击条件下光伏电池的力-电行为具有重要意义。基于分离式霍普金森压杆,发展了一种驱动较大尺寸颗粒群高速冲击的实验方法,并系统测量了不同冲击条件下,多晶硅光伏电池的损伤行为与光电转化性能衰减规律。研究结果表明,随着颗粒直径、冲击速度和数密度的增加,光伏电池的光电转换效率快速降低;颗粒冲击后光伏电池表现出三种典型的损伤模式,并给出了对应的应力阈值条件。基于实验测试结果,发展了多晶硅光伏电池颗粒群冲击损伤诱导光电转化性能退化模型,为沙砾冲击环境下光伏电池光电性能衰减规律提供了有效的预测方法。Abstract: Photovoltaic cells have been widely used in desert areas and other solar-rich environments due to the relatively high solar energy to electricity conversion efficiency. Under the long-term dust impact condition in the desert dust environment, the internal structures of photovoltaic cells are prone to damage, resulting in a significant deterioration of photoelectric conversion efficiency. Therefore, it is of great significance to understand the photoelectric response of photovoltaic cells subjected to massive particles impact. Firstly, a millimeter-scale high-speed particle impact experimental method was developed based on split Hopkinson pressure bar (SHPB) facility. The experimental results showed that the damage of the photovoltaic cell was mainly caused by the first impact, leading to the damage characteristics including shear microcracking, brittle fracture and delamination. Then, the critical stresses corresponding to the three failure modes were analyzed in terms of the initial impact kinetic energy. The first failure mode assumes that high-speed particles behave as fluids, so impulsive compressive stresses are used in the model. The damage in the second failure mode comes from high contact stresses on the impacted surface. The damage in the third mode of failure comes from bending stresses. The photovoltaic performance degradation of the photovoltaic cells after impact under different particle velocities, diameters, and number densities were investigated, showing that the photoelectric conversion efficiency of the photovoltaic cells decreased significantly with the increase of the particle size, the impact velocity, and the number density. Finally, a damage-induced photovoltaic performance degradation (DPPD) model under sand and gravel impact conditions is established to quantitatively describe the influence of impact parameters on the photovoltaic conversion efficiency, in which the two-dimensional damage factor D is proposed to represent the average damage level of the damaged area. The results of the DPPD model are in agreement with the experimental results, validating the applicability of the model for predicting accurately the photovoltaic cell photovoltaic performance under massive sand and gravel impact environment.
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表 1 光伏电池冲击前后光电测试结果
Table 1. Light-electricity conversion performance of the photovoltaic cells before and after impact
测试编号 颗粒直径/mm 冲击速度m/s 颗粒数 输出功率变化/% 光电转化效率/% 损伤特征 1 3 0 0 0 19.0 完好 2 3 30 5 0 19.0 完好 3 3 40 5 −0.8 18.8 微裂纹 4 3 45 5 −3.2 18.4 微裂纹 5 3 55 5 −6.1 17.8 明显断裂 6 3 45 1 −0.8 18.8 微裂纹 7 3 55 1 −1.4 18.7 明显断裂 8 3 65 1 −2.2 18.6 分层脱胶 9 3 65 10 −22.2 14.7 分层脱胶 10 3 65 15 −30.0 13.3 分层脱胶 11 2 65 10 −0.1 19.0 微裂纹 12 2 87 10 −9.9 17.2 明显断裂 13 2 122 10 −27.0 13.9 分层脱胶 14 2 84 15 −12.3 16.7 明显断裂 15 2 128 15 −36.0 12.3 分层脱胶 16 1 128 100 −2.3 19.0 完好 17 3 45 5 −12.5 16.6 明显断裂 2 87 10 18 3 65 10 −23.0 14.6 分层脱胶 2 -
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