This paper presents results of one-year monitoring of AC side electrical parameters and the characterization of local solar radiation at the biggest rooftop PV Power Plant, with an installed capacity of 1.42 MWp, mounted at Mineirão Football Stadium in Brazil. This stadium is one of the sport facilities that hosted 2014 FIFA World Cup and Rio 2016 Summer Olympics Games in the country. Results showed how it is important to study and characterize the solar resource in the region of interest, based on historic data, to provide the understanding of solar radiation and thus project PV power plants with better performance. Furthermore, AC electrical data show the behavior of active, reactive and apparent powers and the influence of the PV system on the power factor at the local grid utility connection point. Finally, PV power plant performance data (as annual final yield, performance ratio and capacity factor) are also presented and compared with data from PVsyst software simulations. The results over the monitoring period were good considering the specificities of the stadium.
This research shows the methodology results for outdoor characterization by the I-V curves of the PV power generators at the biggest Brazilian rooftop PV power plant mounted at the Mineirão Football Stadium. The experimental results of the methodology were obtained by a measurement campaign using two capacitive loads. This work identified a significant difference when these measurements were extrapolated to standard test conditions (STC) and compared to the rated power data shown on the PV modules' label at strings: between 24.12% to 26.19% lower. Results showed a contribution of soiling in a power reduction of about 6.7% on average. Additionally, it was considered an uncertain method, and AC electrical parameters were monitored. The reference PV module's calibration was carried out with great attention-the measurements were made with the PV device under test (DUT), guaranteeing the same real operating conditions for the reference PV module and the PV string as DUT. This measurement method has allowed a better characterization of the uncertainty associated with the measurement process. Finally, this study demonstrates the importance of investigating the actual power of the installed PV generators and how these measurements are essential to guaranteeing energy production following the owner's expectations.INDEX TERMS PV power plants, on-site I-V curve measurements, uncertainty method, translation to STC, commissioning/quality assurance, dust and soiling degradation taxes on PV modules.
This paper proposes an economic dispatch strategy to accommodate photovoltaic (PV) generation, using the solar radiation historical data. The stochastic scenario based economic dispatch approach is formulated in the context of a power system with photovoltaic generators. The stochastic nature of PV power is represented through scenarios. The strategy proposed addresses the improvement of system ability to maintain the power balance while minimizing the management costs of power system. The benefits of this approach are illustrated using a modified version of the IEEE 30-bus test system. The results obtained show that the proposed model is appropriated to accommodate the estimation error of PV generation, while providing economic benefits.
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