Persona: Pérez Molina, Clara María
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Pérez Molina
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Clara María
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Publicación Optimized design method for storage systems in photovoltaic plants with delivery limitation(Elsevier, 2019-03-01) Colmenar Santos, Antonio; Mario Monteagudo Mencucci; Enrique Rosales-Asensio; Miguel de Simón Martín; Pérez Molina, Clara MaríaIt results widely common for distribution network operators to impose restrictions on delivered solar photovoltaic generated power when the power plant rated power is greater than the maximum allowed due to the distribution network capacity. Thus, a feasible solution to maximize the performance of the solar power plant is the integration of battery energy storage systems. Although this configuration has been extensively studied in the existing literature, an optimal design method to determine the proper size and operation of the energy storage system needs to be developed. In this paper, a novel method to help power plants designers to determine the optimal battery energy storage capacity to integrate into any solar photovoltaic power plant is provided. The proposed algorithm minimizes the potential power curtailment and optimizes the utilization rate of the batteries storage system. The algorithm can be applied to any grid connected solar photovoltaic power plant under delivery power restrictions, regardless of power capacity and location. The algorithm has been implemented to a simulated power plant with delivery limitations based in a real case, and results with the optimal battery capacity show that the system would be able to recover up to the 83% of the curtailed energy and a yearly average capacity utilization of 56%. Moreover, the BESS operation has been validated with a scaled model run in Simulink and laboratory measurements, achieving 98% of curtailed energy recovery rate and a 57% of average capacity utilization.Publicación Teaching Using Collaborative Research Projects: Experiences with Adult Learners in Distance Education(MDPI, 2021-09-18) Enrique Rosales Asensio; Sierra García, José Carlos; Pérez Molina, Clara María; Jesús Romero Mayoral; Colmenar Santos, AntonioThis research studies the acquisition and improvement of specific cognitive, functional, and social competencies of the students enrolled in a university module in which we applied Collaborative Research Project (CRP) strategy. The module was Research Methodology for a master’s degree in research in electrical engineering, electronics and industrial control given at the National Distance Education University (UNED) in Spain. This practice was applied to a research project in which the private sector was interested in. We have been aiming at increasing academia–industry interaction while promoting active learning; both are principles advocated by the European Higher Education Area (EHEA). Having applied this strategy, the module learning outcomes were evaluated following the guideline standards set by the National Agency for Quality Assessment of Universities (ANECA) of the Spanish Government. The results from this evaluation indicated that CRP, even when carried out by using distance learning, has encouraged the students’ interest in both research and the module. It has also fostered collaboration between students and lecturers while increasing their degree of satisfaction. We highlight the difficulties in merging all the outcomes from the students’ research as the main drawback.Publicación Techno-economic analysis of a heat and power combination system based on hybrid photovoltaic-fuel cell systems using hydrogen as an energy vector(Elsevier, 2021-06-01) Peláez Peláez, Sofía; Colmenar Santos, Antonio; Pérez Molina, Clara María; Ana-Esther RosalesA techno-economic assessment is conducted for a hybrid combined generation system based on renewable storage technologies such as those offered by fuel cells and using hydrogen as a fuel, which is considered to be a sustainable energy vector. The proposed system consists of three subsystems: a photovoltaic system, which generates electrical energy through solar energy; the system for the generation, consumption and storage of hydrogen, where an electrolyzer is available to obtain hydrogen from water; the fuel cell, which will generate electrical and heat energy and a hydrogen tank to store the hydrogen; and a thermal system, consisting of a Heat Recovery Steam System and an absorption chiller where the thermal energy from the heat cell will be used for the thermal load. The electrical energy generated by the fuel cell serves as a support for the solar energy when, for whatever reason, it cannot meet the demand. The economic assessment, performed using the Hybrid Optimization of Multiple Energy Resources (HOMER) software, shows that the net present cost of the optimized system is $1,006,293 and the cost of energy $0.8399/kWh. The research here presented proved that, although this system is not economically viable at present, it is technically possible.Publicación Analysis on the electric vehicle with a hybrid storage system and the use of Superconducting magnetic energy storage (SMES)(Elsevier, 2021-11) Molina Ibáñeza, Enrique Luis; Rosales Asensio, Enrique; Pérez Molina, Clara María; Colmenar Santos, Antonio; Mur Pérez, FranciscoGiven the current load and power density limitations in electric vehicle (EV) storage systems, it is necessary to study hybrid and control systems in order to optimize their performance and present themselves as a real alternative to internal combustion engine (ICE) vehicles. This implies the development of legislation and specific regulations that enable the research and development of these storage and management systems for hybrid systems. The research presented here aims to analyze the implementation of the SMES (Superconducting Magnetic Energy Storage) energy storage system for the future of electric vehicles. To do this, the need for a hybrid storage system has been taken into account, with several regulatory options, such as the reduction of rates or the promotion of private investments, which allow the technological development of EVs. What is sought is to achieve the market share proposed by the different countries to reduce Greenhouse Gases (GHG), according to their objectives. This approach must be taken from the legislative and regulatory perspective, specific to EVs and charging points, of several countries or regions with different cultures, management models and implementation potential, such as the United States of America (USA), Europe and China. This analysis is associated with the economic study of costs that this storage system may involve in the implementation of EVs to replace ICE vehicles, resulting in possible economic benefits as well as the environmental benefits of the use of EVs. In this analysis, the current high cost of using a hybrid system of these characteristics can be observed with the comparison of three EVs, as well as current data on GHG emissions produced by transport. All this leads to a series of advantages and disadvantages that must be taken into account in order to achieve the objectives that countries have in the coming decades of EV diffusion.Publicación Study on the economics of wind energy through cryptocurrency(Elsevier, 2022-11-02) Vega Marcosa, Raúl; Mur Pérez, Francisco; Pérez Molina, Clara María; Rosales Asensio, Enrique; Colmenar Santos, AntonioThe Green Pact signed by the European Union establishes a trend towards renewable energies to combat the greenhouse gas emissions. Among the technologies used to produce this type of energy, wind power generation technology stands out, which, in countries such as Spain, already has significant installed power. The main problems posed by this technology plans are the uncertainty intervals of wind power and its inclusion in the electricity market, due to the complex price system that does not always favor the producers. The main purpose of this research is to promote the installation of more wind power plants. For this, the installation of cryptocurrency mining equipment is proposed, which will be powered by the generation produced by these wind power plants. The article analyzes the production of cryptocurrencies is a growing business. In the research process, the latest cryptocurrency mining equipment is evaluated. It is analyzed which equipment is the most suitable for its installation in the wind power plant and an economic study is made for the construction project of a large wind power plant. Finally, it will be seen that in this way the amortization time of the facilities decreases and also the project is more attractive for the investor since they can decide between injecting energy into the electrical network or mining cryptocurrencies. If a wind power plant invests in cryptocurrency mining in parallel to the production of electrical energy for the grid, it can decide when to enter the electricity market pool or engage in mining. In this way, the idea of building many more wind power plants becomes more attractive. This would lead to a market where this renewable energy would be much more abundant and the price curve would shift to a lower price, as well as a significant reduction in greenhouse emissions.