Electronica y de Control

Madrid, Spain

Electronica y de Control

Madrid, Spain
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Davila-Gomez L.,Technical University of Madrid | Colmenar-Santos A.,Electronica y de Control | Tawfik M.,Electronica y de Control | Castro-Gil M.,Electronica y de Control
Simulation Modelling Practice and Theory | Year: 2014

This paper proposes a new model for characterizing the energetic behavior of grid connected PV inverters. The model has been obtained from a detailed study of main loss processes in small size PV inverters in the market. The main advantage of the used method is to obtain a model that comprises two antagonistic features, since both are simple, easy to compute and apply, and accurate. One of the main features of this model is how it handles the maximum power point tracking (MPPT) and the efficiency: in both parts the model uses the same approach and it is achieved by two resistive elements which simulate the losses inherent to each parameter. This makes this model easy to implement, compact and refined. The model presented here also includes other parameters, such as start threshold, standby consumption and islanding behavior. In order to validate the model, the values of all the parameters listed above have been obtained and adjusted using field measurements for several commercial inverters, and the behavior of the model applied to a particular inverter has been compared with real data under different working conditions, taken from a facility located in Madrid. The results show a good fit between the model values and the real data. As an example, the model has been implemented in PSPICE electronic simulator, and this approach has been used to teach grid-connected PV systems. The use of this model for the maintenance of working PV facilities is also shown. © 2014 Elsevier B.V. All rights reserved.


Colmenar-Santos A.,Electronica y de Control | Vale-Vale J.,Electronica y de Control | Borge-Diez D.,Electronica y de Control | Requena-Perez R.,Electronica y de Control
Energy and Buildings | Year: 2014

Solar thermal has been consolidated as a renewable energy solution for new buildings during recent years. Although this system has been easily integrated in low-rise buildings, a continuous challenge is the integration of solar thermal into the demanding architectural solutions for high-rise buildings. This article presents solutions for solar water installations in high rise buildings. It describes the integration of solar collectors into the building, hot water distribution installation and proposes a solution to minimise the risk of exposure to Legionella. As an example of the requirements of solar thermal in developing countries, the article analyses the development of the solar hot water standards in Brazil, where although there is a draft document for a federal standard, cities like Sao Paulo have already in place solar thermal requirements for any new building in the city. In order to promote the development of renewable integration, initiatives like PROCEL certify buildings energy performance if they meet the improved target, compared to regulatory requirements, of generating a minimum of 60% of hot water using solar thermal. The presented case study for a 5 star hotel clearly justifies the installation of solar thermal systems in buildings with a high demand for hot water. © 2013 Elsevier B.V.

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