This article presents an experimental study of dust effect on the photovoltaic system's performance for various tilt angles in semi-arid environment. For analysis, eight PV modules were installed on the roof of a building at tilt angles of 0°, 15°, 30°, and 45° with an azimuth angle of 0°. Each pair of PV modules were installed at the same tilt angle. In each pair of modules, one was cleaned every two weeks and the other one was left under outdoor environmental condition. In order to analyze PV performances, the output power of the modules, as well as the climate parameters, were measured every one minute. The results showed that the reduction rate of PV performance due to dust accumulation is strongly dependent on the tilt angle. A dust storm has occurred in the mid-test period, which has reduced the daily average energy generated of PV modules at tilt angles of 0°, 15°, 30°, and 45° by 58.2%, 27.8%, 21.7%, and 20.7%, respectively. However, for a few weeks before the dust storm, the average reduction ratio of the daily energy generated of PV modules due to dust accumulation was 8.6% for the horizontal module and 0.8% for the other tilted modules.

本文介绍了在半干旱环境中，灰尘对光伏系统性能的各种倾斜角度的实验研究。为了进行分析，将八个光伏模块以0°，15°，30°和45°的倾斜角（方位角为0°）安装在建筑物的屋顶上。每对PV模块以相同的倾斜角安装。在每对模块中，每两周清洁一次，另一对则放在室外环境下。为了分析光伏性能，每隔一分钟测量一次模块的输出功率以及气候参数。结果表明，由于灰尘积聚而导致的PV性能下降速率很大程度上取决于倾斜角。测试期间发生了沙尘暴，从而使倾斜角度分别为0°，15°，30°和45°的PV组件每天产生的平均能量降低了58.2％，27.8％，21.7％和20.7％。然而，在沙尘暴之前的几周内，水平组件的灰尘堆积导致的光伏组件每日平均能量平均减少率为8.6％（水平组件）和0.8％（其他倾斜组件）。