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Publication Efectos de una alta penetración de energías renovables en el sistema eléctrico(2014-03-01) Bueno Lorenzo, MíriamThe increased share of renewable energies has changed both power system functioning and conventional plants operation. With regard to the latter, power plants using fuel have change their operation mode to accommodate to the variability and partial predictability of renewable energy sources. This fact increases the operation costs of the conventional plants. Besides, market prices behaviour will experience changes, such as the decrease of average prices and the increase of their variability. The positive e ects of an increased renewable installed capacity are also assessed. Furthermore, in countries with abundant solar resource, studying the e ects of a higher share of renewable energy sources on the generation mix is necessary, including a high portion of photovoltaic and solar thermal energy in the generation portfolio. Therefore, a model of the concentrated solar power generators has been developed in this work. The results of the thermoelectric model supplies the annual production of this technology, which has been integrated in the generation schedule model. To analyse the impact of the future con guration of the generation mix on the power system, a model of unit commitment has been employed. It includes the characteristics and installed capacity of the generators using fuel and the estimation of the future production series of renewable energies. The results discussion contains an analysis of some relevant characteristics of the future power system behaviour, such as, daily market prices, yearly production by technology, capacity factors of the different technologies, wind spilled energy, ratio of demand coverage coming from renewable sources, hourly variation of the energy supplied by hydro, coal, and natural gas power plants, greenhouse emissions and operation costs.Publication Operación óptima de una planta hidráulica reversible que cubre los desvíos en la predicción de un productor eólico(2009-09-29) Jaramillo Duque, Álvaro; Castronuovo, Edgardo Daniel; Usaola García, Julio; UC3M. Departamento de Ingeniería EléctricaEn algunos mercados de energía eléctrica, el productor eólico debe proporcionar con antelación un programa de producción, usualmente basado en herramientas de predicción de potencia eólica. Adicionalmente, es responsable de asumir los desvíos que pueden darse entre las previsiones y la producción real de la energía. Con el fin de disminuir los sobre costos por desvíos, es propuesta la operación conjunta de una planta hidráulica reversible que adapta su operación para compensar los errores en la predicción de potencia eólica. Con el fin de optimizar la operación de la planta hidráulica reversible, es necesario cuantificar con antelación la incertidumbre de la predicción de potencia eólica. Para esto es desarrollado un método basado en los datos historicismos de la producción de potencia eólica y su predicción, con el cual se logra modelar la producción de potencia eólica y posteriormente, es posible definir intervalos de incertidumbre para la misma. Finalmente, es formulado un problema de optimización, utilizando como entradas la incertidumbre de la predicción y las características de la planta hidráulica reversible, donde el objetivo es encontrar el mejor programa de operación para la planta hidráulica reversible que cubra los posibles desvíos del productor eólica.Un caso realista es utilizado para evaluar el método propuesto.Publication Participation of Wind Power in Electricity Markets(2008-08-22) Usaola García, JulioThis work shows the preliminary conclusions of an study about the possibility of arbitraging in intraday electricity markets, taking into account the uncertainty of short term wind power prediction programs and price prediction tools. The rules of the Spanish market have been loosely followed.Publication Probabilistic load flow in systems with high wind power penetration(2008-08-22) Usaola García, JulioThis paper proposes a method for solving a probabilistic load flows that takes into account the uncertainties of wind generation, but also of load and conventional systems. The method uses a combination of methods including cumulant, point estimate and convolution. Cornish Fisher expansion series are also used to find the CDF. The method is of especial application to estimate active power flows through lines.