ARE YIELD CERTIFICATES RELIABLE? A COMPARISON TO MONITORED REAL WORLD RESULTS

机译：合格证书是否可靠？监视的真实世界结果的比较

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Due to the importance of yield certificates for large photovoltaic power plants, their reliability needs tobe reviewed. The preparation of a yield certificate comprises two main tasks: (1) an estimation of the solar radiationresource and (2) the accurate modeling of all physical and technical losses in the PV system under consideration. Anobvious way to assess the quality of yield certificates is a comparison of predicted yield values with those measuredduring the commercial operation of the PV systems.We performed such a comparison – mainly based on performance ratio values – for 15 PV systems located in southernGermany, where both yield certificates and monitoring data were available at our group. Commonly, yield certificatecalculations are based on solar irradiation data derived from pyranometer measurements, while monitoringsystems are equipped with silicon reference cells. Therefore, predicted or observed values of performance ratio needcorrections regarding the differences in sensor response. Doing so, the average deviation between predicted and observedperformance ratio values comes close to 1%. For all PV systems running properly from a technical point ofview, the performance ratio may be predicted within a range of ±2%.It turns out that component and system models are not the primary source of yield certificate uncertainties. Irradiationconversion models and the uncertainty of the direct/diffuse ratio of incoming irradiation have a bigger influence,while the most challenging problem is the uncertainty of long term solar irradiation sums.

机译：由于大型光伏电站的合格证书非常重要，因此其可靠性需要被审查。产量证书的准备包括两个主要任务：（1）估算太阳辐射资源;（2）对所考虑的光伏系统中所有物理和技术损失的准确建模。一个评估产量证书质量的一种明显方法是将预测的产量值与测得的产量值进行比较在光伏系统的商业运营中。我们主要根据性能比值对南部15个光伏系统进行了比较德国，我们的小组均提供了产量证明和监测数据。通常，产量证明书计算是基于从太阳总辐射表测量中得出的太阳辐射数据，同时进行监测系统配备了硅参考电池。因此，需要预测或观察到的性能比值关于传感器响应差异的更正。这样做，预测值与观察值之间的平均偏差性能比率值接近1％。从技术角度而言，对于所有正常运行的光伏系统因此，可以预测性能比在±2％的范围内。事实证明，组件和系统模型不是产量证书不确定性的主要来源。辐照转换模型和入射辐射的直接/扩散比的不确定性影响更大，而最具挑战性的问题是长期太阳辐射总和的不确定性。

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《European photovoltaic solar energy conference》|2007年|p.2947-2951|共5页
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Bj?rn Müller; Christian Reise; Wolfgang Heydenreich; Klaus Kiefer;
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中图分类太阳能技术;太阳能电池;
关键词
simulation; monitoring; performance;

机译：模拟;监控;性能;

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ARE YIELD CERTIFICATES RELIABLE? A COMPARISON TO MONITORED REAL WORLD RESULTS

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