Examinando por Autor "Nofuentes, Gustavo"
Mostrando 1 - 3 de 3
- Resultados por página
- Opciones de ordenación
Ítem Characterization of bifacial technology PV systems(Sage, 2024-04-28) Moreno-Buesa, Sergio; Muñoz-Cerón, Emilio; Nofuentes, Gustavo; Gulkowski, Slawomir; de la Casa, Juan; Aguilera-Tejero, JorgeBifacial solar technology has experienced exponential growth in recent years and its trend is increasing for the coming years. Considering the advantages that it offers over monofacial technology such as its current price equivalence, the increase in performance thanks to the production of the rear face and the consecutive reduction of the LCOE, it is logical that more and more photovoltaic plants with this technology are been installed. Nowadays, there are some regulatory gaps regarding bifacial technology and, due to this growing trend, it is necessary to study, research and implement the optimal way to evaluate these systems. This article has experimented with a 3.3 kW bifacial photovoltaic system, divided into two strings with different configurations, whose monitoring system has all the instrumentation included in the IEC 61,724 standard, with the addition that it has several rear irradiance sensors arranged in different locations of the system to evaluate the variability of this parameter. After an experimental campaign of 9 months, a power estimation analysis and the calculation of the PR and PR 25°C have been carried out using the different rear irradiance sensors. The variability of this parameter depending on the location of the sensor has affected the results in such a way that the RMSE committed in the power estimation has varied between 10.22% and 2.63%, while the PR and PR 25°C of the system has oscillated between 0.84 for the most unfavorable case and 0.95 in the most favorable case. Assumed the great variability between performance ratios, it is necessary to establish a specific normative standard for the evaluation of Bifacial PV systems.Ítem Evolution of the cost and economic profitability of grid-connected PV investments in Spain: Long-term review according to the different regulatory frameworks approved(Elsevier, 2016-12) López-Talavera, Diego; Muñoz-Cerón, Emilio; Ferrer-Rodríguez, J.P.; Nofuentes, GustavoSpain has shifted from a predominant position in the worldwide market according to the accumulated PV power installed, to an irrelevant level where it is even no longer present at the PV market survey; but not always this has been the situation. The Spanish Government have promoted renewable energy policies which have turned very rapidly from a promising scenario, especially in the 2004–2008 period, into an unstable situation not only for future investors in this technology, but also for current owners that have been witnesses of a decrease in their profitability expectations. Furthermore, although the retroactive measures that have been applied to the owners of these PV plants could be, paraphrasing the Government words, “reasonable profitable”, the problem arises when they may be unable to afford the annual liquid assets of the funding mechanism chosen for their PV investments. Therefore, in a scenario where in the last decade more than 12 laws and Royal Decrees have been promulgated in Spain, it is interesting to review the effects in the profitability and cost parameters that this legislation has had on the PV market, on the owners and also on prospective investors. In this paper a complete economic profitability and cost analysis based on the NPV, IRR and LCOE has been undertaken for the case of Spain since 1998, correlating it to the evolution of the legislative framework applicable to the photovoltaic technology.Ítem Sale of profitable but unaffordable PV plants in Spain: Analysis of a real case(Elsevier, 2018-06) Lomas, J.C.; Muñoz-Cerón, Emilio; Nofuentes, Gustavo; de la Casa, JuanThe Spanish photovoltaic industry was stunningly successful during 2007–2010, fostered by a favourable feed-in tariff system. Nevertheless, the cost overrun of this promotion policy led to government legislation against existing PV plants. Although these investments will be profitable when the subsidy ends, according to the last law enacted in Spain (IRR = 7.4%), either a massive sale to vulture funds or the abandonment of PV plants is being planned. Owners are unable to cover the loans through which they were originally financed. In this scenario, investors find it more profitable to cancel all operational expenditures and allocate this working capital to cover their loans, although this measure implies a 22% energy reduction. This study analyses a representative Spanish PV plant based on real energy and economic data. The analysis shows the turn from an attractive IRR = 10.14% to a situation with limitations where the owner injects money annually to overcome potential bankruptcy of the investment. This paper reflects the influence of promotion policies in the profitability of PV plants. Additionally, the adverse legal framework in Spain identifies a profitable but unaffordable scenario, highlighting the differences between the economic and financial performance of a PV investment.