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Morales-Espana, G. (author), Hernández-Serna, Ricardo (author), Tejada-Arango, Diego A. (author), Weeda, Marcel (author)In this paper, we aim to analyse the impact of hydrogen production decarbonisation and electrification scenarios on the infrastructure development, generation mix, CO<sub>2</sub> emissions, and system costs of the European power system, considering the retrofit of the natural gas infrastructure. We define a reference scenario for the European...journal article 2024
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Serna Suarez, I.D. (author), Morales-Espana, G. (author), de Weerdt, M.M. (author), Carrillo-Caicedo, G. (author), Ordóñez-Plata, G. (author), Quiroga, O. A. (author)The integration of Distributed Energy Resources (DERs) in distribution networks comes with challenges, like power quality concerns, but also opens up new opportunities, e.g., DERs can offer competitive energy prices for final users by leveraging time arbitrage. A suitable method to fully exploit such opportunities is to compute the optimal...journal article 2023
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Philipsen, R.M. (author), Morales-Espana, G. (author), de Weerdt, M.M. (author), De Vries, Laurens (author)Day-ahead electricity markets are inefficient due to their coarse discretisation of time and their representation of electricity production and consumption in energy per time interval. This leads to excessive costs and infeasible schedules in the market clearing results. Some real-world systems have increased the resolution to improve accuracy,...journal article 2019
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Serna Suarez, I.D. (author), Carrillo-Caicedo, Gilberto (author), Morales-Espana, G. (author), de Weerdt, M.M. (author), Ordóñez-Plata, Gabriel (author)The increase of solar photovoltaic penetration poses several challenges for distribution network operation, mainly because such high penetration might cause reliability problems like protection malfunctioning, accelerated decay of voltage regulators and voltage violations. Existing solutions based on mathematical programming solve a 3-phase...journal article 2019
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Morales-Espana, G. (author), Lorca, Álvaro (author), de Weerdt, M.M. (author)The increasing penetration of uncertain generation such as wind and solar in power systems imposes new challenges to the unit commitment (UC) problem, one of the most critical tasks in power systems operations. The two most common approaches to address these challenges — stochastic and robust optimization — have drawbacks that restrict their...journal article 2018
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Mackay, L.J. (author), Guarnotta, Robin (author), Dimou, Anastasios (author), Morales-Espana, G. (author), Ramirez Elizondo, L.M. (author), Bauer, P. (author)The emergence of distributed energy resources can lead to congestion in distribution grids. DC distribution grids are becoming more relevant as more sources and loads connected to the low voltage grid use dc. Bipolar dc distribution grids with asymmetric loading can experience partial congestion resulting in a nodal price difference between...journal article 2018
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van der Linden, J.G.M. (author), de Weerdt, M.M. (author), Morales-Espana, G. (author)In power systems, demand and supply always have to be balanced. This is becoming more challenging due to the sustained penetration of renewable energy sources. Because of the increasing amount of electrical vehicles (EVs), and the high capacity and flexibility of their charging process, EVs are a good candidate for providing balancing services...conference paper 2018
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Van Der Meer, Dennis (author), Chandra Mouli, G.R. (author), Morales-Espana, G. (author), Ramirez Elizondo, L.M. (author), Bauer, P. (author)In [1], the name of one co-author, Germán Morales-Espana, was rendered incorrectly as Germán Morales-Espana Mouli. The correct byline is shown above. We sincerely regret the error.journal article 2018
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van der Meer, Dennis (author), Chandra Mouli, G.R. (author), Morales-Espana, G. (author), Ramirez Elizondo, L.M. (author), Bauer, P. (author)This paper presents the design of an energy management system (EMS) capable of forecasting photovoltaic (PV) power production and optimizing power flows between PV system, grid, and battery electric vehicles (BEVs) at the workplace. The aim is to minimize charging cost while reducing energy demand from the grid by increasing PV self...journal article 2018
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Morales-Espana, G. (author), Hobbs, Benjamin F. (author)Approximations made in day-ahead markets can result in suboptimal or even infeasible schedules for generating units and inaccurate predictions of actual costs and wind curtailment. Here we compare different optimal models of day-ahead markets based on unit commitment (UC) formulations, especially energy- vs. power-based UC; excluding or...other 2017
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Morales-Espana, G. (author), Ramirez Elizondo, L.M. (author), Hobbs, Benjamin F. (author)Approximations made in traditional day-ahead unit commitment model formulations can result in suboptimal or even infeasible schedules for slow-start units and inaccurate predictions of actual costs and wind curtailment. With increasing wind penetration, these errors will become economically more significant. Here, we consider inaccuracies from...journal article 2017
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- Philipsen, R.M. (author), Morales-Espana, G. (author), de Weerdt, M.M. (author), De Vries, Laurens (author) conference paper 2017
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Correa-Posada, Carlos M. (author), Morales-Espana, G. (author), Dueñas, Pablo (author), Sánchez-Martín, Pedro (author)The growing increase of renewable generation worldwide is posing new challenges for a secure, reliable and economic operation of power systems. In order to face the uncertain and intermittent production of renewable sources, operating reserves must be allocated efficiently and accurately. Nowadays, these reserves are mainly assigned to thermal...journal article 2017
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Ramos, Andres (author), Rivier, Michel (author), Garcia-Gonzalez, Javier (author), Latorre, J. M. (author), Morales-Espana, G. (author)In this paper, we propose a method to analyze the amount of operation reserves procured in a system based on two stages. The first stage is a detailed hourly unit commitment and the second stage is a simulation model with a shorter time period. The method is applied to the Spanish hydrothermal system and several cases are analyzed to determine...conference paper 2016
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Philipsen, R.M. (author), Morales-Espana, G. (author), de Weerdt, M.M. (author), De Vries, Laurens (author)In order to cope with fluctuations and uncertainty, power systems rely on contracted reserves. The day-ahead Unit Commitment (UC) is the short-term planning process which is commonly used to schedule these resources at minimum cost, while operating the system and units within secure technical limits. This paper shows through the evaluation of...conference paper 2016
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Morales-Espana, G. (author), Baldick, Ross (author), García-González, Javier (author), Ramos, Andres (author)This paper proposes a power-based network-constrained unit commitment (UC) model as an alternative to the traditional deterministic UCs to deal with wind generation uncertainty. The formulation draws a clear distinction between power-capacity and ramp-capability reserves to deal with wind production uncertainty. These power and ramp requirements...journal article 2015
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Morales-Espana, G.A. (author), Gentile, C. (author), Ramos, A. (author)This paper provides the convex hull description for the basic operation of slow- and quick-start units in power-based unit commitment (UC) problems. The basic operating constraints that are modeled for both types of units are (1) generation limits and (2) minimum up and down times. Apart from this, the startup and shutdown processes are also...journal article 2015
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Morales-Espana, G. (author)In recent years, high penetration of variable generating sources, such as wind power, has challenged independent system operators (ISO) in keeping a cheap and reliable power system operation. Any deviation between expected and real wind production must be absorbed by the power system resources (reserves), which must be available and ready to be...doctoral thesis 2014
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Morales-Espana, G. (author), García-González, Javier (author), Ramos, Andrés (author)Reserves are playing each time a more important role due to the massive penetration of renewable energy sources nowadays. Operating reserves must be used for unforeseen events. All predictable events must be directly considered in the scheduling stage otherwise there will be an inefficient and unnecessary use of reserves that increases system...conference paper 2012
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Morales-Espana, G. (author), Mora-Floréz, J. (author), Vargas-Torres, H. (author)This paper presents a conceptual approach for eliminating the multiple estimation problem of impedance-based fault location methods applied to power distribution systems, using the available measurements of current and voltage fundamentals at the power substation. Three test systems are used to identify the faulted lateral obtaining high...journal article 2009