Comparative Study of the Types of Photovoltaic Panels Used in Solar Pumping Systems in Dry Tropical Zones: Case of Adamawa Region in Cameroon

In the dry tropical zone where access to water is increasingly difficult for populations, solar pumping units are increasingly installed to provide water to population. In the local market, there are essentially two types of solar panels, namely monocrystalline and polycrystalline. However, the part of the local market is more dominated by the polycrystalline panel. In this work, comparative studies are carried out in order to characterize the two types of solar panels with regard to local constraints. Tests were carried out over the course of the sun to establish the performance of each type. The panels used have the same electrical characteristics and are connected to loads with same characteristics. Under the set operating conditions, the monocrystalline panel presents more performance than the polycrystalline panel. Although the local market is dominated by the polycrystalline panel, dust deposition tests on the surface of the panels show that the performance of the polycrystalline panel is more affected compared to the performance of the monocrystalline panel.

除尘装置对三偏心蝶阀区域粉尘沉降抑制效能的仿真分析

高炉煤气含大量粉尘,易在管道内三偏心蝶阀阀座密封面底部板结,影响阀板转动或损坏密封面,影响高炉生产并造成经济损失.为阻止粉尘在蝶阀阀座密封面底部板结,采用Pro/E设计了蝶阀区域的粉尘自动清除装置.基于ANSYS Workbench的FLUENT模块,选择标准k-ε模型和DPM模型,对不同阀板开度(15°,30°,45°,60°,75°和90°)时蝶阀区域粉尘沉降轨迹进行了仿真模拟,分析了除尘装置对粉尘沉降特性的影响规律.结果显示:阀板开度30°,45°,60°,75°和90°时,除尘装置均能使三偏心蝶阀阀座密封面底部粉尘板结质量显著降低;阀板开度90°时板结粉尘清除率可高达80.7%;而阀板开度15°时,除尘装置未体现明显除尘效果.

计及雾霾影响因素的光伏发电超短期功率预测

近年来频繁出现的雾霾天气,对光伏发电的输出功率造成了显著影响。首先,针对太阳辐射削弱情景,采用机器学习方法对大气气溶胶光学厚度进行估计,进而利用经云遮系数修正的晴空太阳辐射模型计算光伏电池面板接收的辐射强度;其次,针对光伏电池面板积灰情景,开展功率测量实验,构造颗粒物累积浓度——功率衰减率样本集,从而通过相似日筛选估计不同积灰状态下的功率输出衰减率;最终,结合光电转换模型,基于地面颗粒物浓度预测以及精细天气预报信息,提出一种光伏发电超短期功率预测方法。实验结果表明,所提出的预测方法具有较高的精度,且易于工程实现。