Uncertainty in Photovoltaic performance parameters – dependence on location and material
Uncertainty in Photovoltaic performance parameters – dependence on location and material
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DOI：
10.1016/j.solmat.2009.02.003
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发表时间：
2009-06
影响因子：
6.9
通讯作者：
M. Strobel;T. Betts;G. Friesen;H. Beyer;R. Gottschalg
中科院分区：
文献类型：
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作者：
M. Strobel;T. Betts;G. Friesen;H. Beyer;R. Gottschalg
在主要光伏市场，光伏系统投资的回报主要取决于输出到电网的电能（千瓦时）。有效的系统运行通常是通过评估性能指标来保证的，比如从监控的系统性能数据中计算出的性能比率（PR）。低站点特定PR表明可能导致利润损失的操作问题，甚至如果以前保证过PR，则可能出现保修情况。本文建立了可以识别次优性能的边界。这是通过计算所需测量的不确定度来实现的。结果表明，性能指标的不确定性以及可识别次优性能的边界随操作环境和仪器设置而变化。本文研究了三种测量系统、三种位置和两种模块类型的边界。结果表明，北欧年PR的不确定性可高达4.5%，比南欧站点高50%。研究还表明，基于功率测量的低系统性能的确定是非常困难的，并且充满了显著的不确定性，而基于能量的评估则更加稳健。
The return from investments in PV systems in the main PV markets depends mostly on the electrical energy exported to the grid (kWh). Efficient system operation is generally assured by assessment of performance indicators, such as performance ratios (PR) that are calculated from monitored system performance data. Low site-specific PRs indicate operational problems that might result in a loss of profit or even a warranty case if a PR was previously guaranteed and this paper establishes the boundaries in which sub-optimal performance can be identified. This is achieved by calculating the uncertainties of the required measurements. It is shown that the uncertainty of performance indicators and thus the boundary at which sub-optimal performance can be identified varies with the operating environment and instrumentation set-ups. This study has investigated those boundaries for three measurement systems, three locations and two module types. It is shown that the uncertainties in the annual PR can be as high as 4.5% for Northern Europe, 50% higher than for a Southern European site. It is also shown that the determination of low system performance based on power measurements is extremely difficult and riddled with significant uncertainties, while the evaluation based on energy is much more robust.