Optimising effective albedo data for bifacial PV systems

无论是装机容量还是技术进步，可再生能源行业都处于蓬勃发展之中。对标准太阳能光伏（PV）模块的最新改进之一是双面光伏（BFPV），它利用从地面反射到面板背面的光来增加能量产量。根据地面条件，与传统光伏组件相比，这种双面增益可以帮助产生额外的5-20%的电力。双面光伏项目已经开始成为太阳能光伏安装总市场份额的重要组成部分，而且这种增长预计不会很快停止。然而，用于预测BFPV系统发电量的分析精度较低，这可能会降低项目的可融资性。BFPV分析的一个关键特征是预测到达模块后部的辐照率，主要来自地面反照率，这可能导致精度如此低。反照率取决于许多特定地点的参数，而不限于一天中的时间、季节变化和一块土地上的地面变化。该项目是继两轮成功的创新者分析计划之后，RINA和NPL合作评估了更准确的反照率测量，不同的卫星源进行初步估计，并建立了可以在实际太阳能光伏电站部署的地面测量系统。这些结果表明，该分析可以降低BFPV项目的风险，但仍有很大的改进空间。在第7轮中，RINA和NPL将合作创建新的方法，以尽可能高的精度提供双面增益估计。这将通过调查以下主要目标来完成：？*分析具有更高空间分辨率的新卫星数据库；？*用新的现场设备进行实验，以近似有效反照率；*寻找合适的技术组合，以准确估计地面反照率和双面增益；*与更广泛的BFPV行业分享成果，并为最先进的行业标准做出贡献。我们希望，这些知识将有助于降低投资者对新建BFPV电站的技术和财务风险，从而促进投资。这将不可避免地帮助英国更接近其减少二氧化碳排放和国家环境影响的目标。

The renewable energy industry is in a boom of growth, both in installed energy generation capacity and in technological advances. One of the latest improvements to standard solar photovoltaic (PV) modules is bifacial PV (BFPV), which utilises the light that reflects from the ground onto the back of the panel to increase the energy yield. Depending on the ground conditions, this bifacial gain can help generate a further 5-20% of power compared with traditional PV modules. Bifacial PV projects have already started to become a significant portion of the total market share for installed solar PV, and this growth is not predicted to stop any time soon. However, the analysis that goes into predicting the energy yield of a BFPV system is subject to a low level of accuracy and this can lower the bankability of a project.?A key feature of BFPV analysis which can lead to this low level of accuracy is predicting the ratio of irradiation which reaches the back of the module, mainly derived from the ground albedo. The albedo is dependent on a number of site-specific parameters not limited to the time of the day, seasonal changes, and ground variation across a plot of land. This project follows from two successful rounds in the Analysis for Innovators scheme, where RINA and NPL partnered together to evaluate a more accurate albedo measure, varied satellite sources for initial estimations, and established ground-based measurement systems which can be deployed in real solar PV sites. These results showed that this analysis can decrease the risks of a BFPV project, but there is still significant room for improvement.?During Round 7, RINA and NPL will partner together to create new methodologies which can deliver bifacial gain estimations with the highest accuracy possible. This will be done by investigating the following key objectives:?* Analysing newer satellite databases capable of higher spatial resolution;?* Experimenting with new on-site equipment to approximate effective albedo;?* Find a suitable combination of techniques which can accurately estimate ground albedo and bifacial gain;* Share results with the wider BFPV industry and contribute to state-of-the-art industry standards.?Our hope is that this knowledge will contribute towards reducing the technical and financial risks of investors for new BFPV plants, consequently boosting investments. This will inevitably help push the UK closer towards its goal of reducing deducing its CO2 emissions and the country's environmental impact.