Antonio J. Gallego Len

Antonio J. Gallego Len
Universidad de Sevilla | US · Systems Engineering and Automatics

Doctor of Engineering

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54
Publications
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486
Citations
Citations since 2016
39 Research Items
430 Citations
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2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080

Publications

Publications (54)
Chapter
Full-text available
Hoy en día, a la hora de estudiar el rendimiento de una planta, es típico contar con un modelo fiable que permita realizar pruebas sin desperdiciar recursos en ensayos innecesarios en la planta real. Uno de los programas empleados en la industria es Matlab®, el cual posee la herramienta llamada Simulink®, con la que se puede describir un sistema me...
Conference Paper
Solar plants are exposed to numerous agents that degrade and damage their components. Due to their large size and constant operation, it is not easy to access them constantly to analyze possible failures on-site. It is, therefore, necessary to use techniques that automatically detect faults. In addition, it is crucial to detect the fault and know i...
Article
The size of existing commercial solar trough plants poses new challenges in applying advanced control strategies to optimize operation. One of these challenges is to obtain a better thermal balance of the loops’ temperature. Since plants are made up of many loops, the efficiency of the loops can vary substantially if a group has been cleaned or aff...
Article
Full-text available
This paper proposes the first application of a split-range control technique on a concentrating solar collector to improve an absorption plant production. Solar absorption plants have solar power availability in phase with cooling demand under design conditions. Thus, it is a powerful cooling technology in the context of renewable energy and energy...
Article
Full-text available
Uno de los principales métodos para mejorar la eficiencia en el uso y aprovechamiento de la energía solar es la aplicación de técnicas avanzadas de control. En este trabajo se presenta un estado del arte de las aplicaciones de control predictivo en plantassolares de pequeña y gran escala. Se presentan además dos aplicaciones reales: una que se dise...
Article
Full-text available
The size of the current commercial solar trough plants poses new challenges in the applications of advanced control strategies. Ensuring safe operation while maintaining the temperature around an adequate set-point can lead to substantial gains in power production. Furthermore, the controller has to take into account the steam generator constraints...
Article
Full-text available
Solar plants are exposed to the appearance of faults in some of their components, as they are vulnerable to the action of external agents (wind, rain, dust, birds …) and internal defects. However, it is necessary to ensure a satisfactory operation when these factors affect the plant. Fault detection and diagnosis methods are essential to detecting...
Article
This paper presents a mobile sensor system to detect and estimate low direct normal irradiance (DNI) areas caused by clouds shadows. This work proposes using a team of unmanned aerial vehicles (UAVs) to localise and characterise the shadow of mobile clouds. This information can be used by the plant control system to minimise its effects over a sola...
Article
With the advancement of new technologies, power systems are increasingly equipped with more sensors and actuators, heightening the risk of failure. This fact, together with the vulnerability of solar plants \x96not only to internal faults but also to the action of the sun, rain, wind, and animals, among others\x96 gives rise to the need for detecti...
Article
Solar absorption plants are renewable energy systems with a special advantage: the cooling demand follows the solar energy source. The problem is that this plant presents solar intermittency, phenomenological complexity, and nonlinearities. That results in a challenge for control and energy management. In this context, this paper develops a Digital...
Article
Full-text available
One of the main control objectives in parabolic trough solar thermal plants is to maintain the outlet temperature around an operating point. For this, a synthetic oil flow is used as the main control variable. However, another crucial system of the plant is the defocusing safety system of the collectors to prevent the oil temperature from exceeding...
Article
Full-text available
p>La estimación de estados no observables de un proceso es importante cuando se aplican técnicas de control automático basadas en el espacio de estados. El diseño y uso de estos controladores conlleva suponer que los valores de los estados se podrán obtener de una u otra forma. Cuando todos los estados son medibles, no existe la necesidad de aplica...
Article
In solar thermal plants, as in any industrial process, it is important to maintain good control of the system and, more importantly, to have a good security system to avoid exceeding the safety limits of the components and avoid their degradation. In the case of solar thermal plants, one of the main components is the Heat Transfer Fluid (HTF), whic...
Chapter
The majority of solar thermal plants which produce electricity and deliver it to the grid use parabolic trough technology. As examples of large scale solar trough plants we can mention the SOLANA power station (280 MW of electricity power with 6 hour of thermal storage) or the 280 MW Mojave solar complex. As stated by the National American Academy...
Article
One of the ways to improve the efficiency of solar energy plants is by using advanced control and optimization algorithms. In particular, model predictive control strategies have been applied successfully in their control. The control objective of this kind of plant is to regulate the solar field outlet temperature around a desired set-point. Due...
Article
Full-text available
Competitiveness of solar energy is one of current main research topics. Overall efficiency of solar plants can be improved by using advanced control strategies. To design and tuning properly advanced control strategies, a mathematical model of the plant is needed. The model has to fulfill two important points: (1) It has to reproduce accurately the...
Chapter
One of the great challenges is to make solar energy economical and competitive. This can be achieved by maximizing the generated electricity by using optimal control strategies. A number of research works have been developed concerning control and optimization of solar plants. Most of these works have been developed for the experimental solar trou...
Article
The main control objective in commercial solar parabolic plants is to track the average temperature of all the loops around a reference set by the operator, by manipulating the flow of a synthetic oil. Due to the large number of loops existing in current solar plants and the vast extension that they cover, obtaining a precise knowledge of every loo...
Article
Full-text available
Solar energy for cooling systems has been widely used to fulfill the growing air conditioning demand. The advantage of this approach is based on the fact that the need of air conditioning is usually well correlated to solar radiation. These kinds of plants can work in different operation modes resulting on a hybrid system. The control approaches de...
Article
Commercial solar plants produce energy around a nominal operating point in which the solar field outlet temperature is high and close to the thermal limit of the heat transfer fluid. The main control of the temperature is carried out by means of the fluid flow-rate that circulates through the solar field. Defocusing the collectors is normally used...
Article
Model predictive control strategies have been applied successfully when controlling solar plants. If the control algorithm uses a linear model associated only to an operating point, when the plant is working far from the design conditions, the performance of the controller may deteriorate. In this paper, a gain scheduling model predictive control s...
Article
Full-text available
Model predictive control has been demonstrated to be one of the most efficient control techniques for solar power systems. An incremental offset-free state-space Model Predictive Controller (MPC) is developed for the Fresnel collector field located at the solar cooling plant installed on the roof of the Engineering School of Sevilla. A robust Luenb...
Article
Optimal operation of a solar plant is generally understood as a tracking of the optimal working temperatures which maximize the net electric power. However, a commercial solar plant may receive a limitation from the Transmission System Operator due to saturation of the electrical grid. In these situations the plant moves to an operation mode in whi...
Article
Optimal operation of a solar plant is generally understood as a tracking of the optimal working temperatures which maximize the net electric power. However, a commercial solar plant may receive a limitation from the Transmission System Operator due to saturation of the electrical grid. In these situations the plant moves to an operation mode in whi...
Article
Optimal operation of solar plant is a challenge due to the multiple disturbances affecting the plant. Research in optimal temperature set-point tracking is extensive whereas research concerning optimal power production under disturbances is not. A solar plant has to deal not only with temperature and radiation disturbances but also with dirt accumu...
Article
One of the most important problems in the operation of solar power towers is to achieve a uniform flux density distribution at the receiver in order to avoid hot spots. The problem can be solved by computing the aim points of the heliostats by optimizing a function which measures the uniformity of the flux density over the receiver. Due to the high...
Article
Advanced control strategies can play an important role in improving the efficiency of solar plants. In particular, linear model predictive control strategies have been applied successfully when controlling solar trough plants. However, if the control algorithm uses a linear model associated only to one operating point, when the plant is working far...
Conference Paper
Full-text available
Es bien conocido que las maniobras de aterrizaje y despegue son las m�as complejas del vuelo de las aeronaves. En efecto, un gran porcentaje de los accidentes a�ereos se da en la ejecuci�on de estas operaciones. Si adem�as se tiene en cuenta que la mayor��a de estos accidentes se deben a errores hu- manos, es evidente la necesidad de un control au-...
Conference Paper
Full-text available
Uno de los recursos m�as importantes para mejorar la e�ciencia en los sistemas de energ��a solar, es el control avanzado. En general, con el uso de estrategias de control convencionales no se obtienen buenos desempe~nos en todo el rango de operaci�on debido a la din�amica fuertemente no lineal de este tipo de sistemas, as�� como las m�ultiples fuen...
Chapter
One of the most important challenges for the use of solar energy is to make it economical. This can be achieved by reducing investment and operating costs and increasing the solar plant performance. Advanced control techniques can be very useful in fulfilling these objectives.This chapter describes two examples of how advanced control techniques ca...
Conference Paper
Full-text available
There are two main drawbacks when operating solar energy systems: a) the resulting energy costs are not yet competitive and b) solar energy is not always available when needed. In order to improve the overall solar plants efficiency, advances control techniques play an important role. In order to develop efficient and robust control techniques, the...
Conference Paper
Direct solar radiation is important in a solar trough plant because it is the perturbation that affects most the operation. Generally, it is measured locally. Production losses or dangerous situations may occur when controlling a plant with wrong measurements. A possible solution is to have several pyrheliometers though two problems arise: cost and...
Article
The importance of the use of renewable energy sources has experienced a great impulse since the beginning of the 80s. In particular, solar energy is the most abundant source of renewable energy. Control strategies can be useful to improving the solar plants efficiency. In this work, a review of the applications of Model Predictive control (MPC) str...
Conference Paper
In this paper we propose an estimator of solar radiation and a heuristic radiation selector to design a solar radiation Fault Tolerant Model Predictive Control strategy for solar trough plants. The complete design of the control system proposed has been simulated using the model of ACUREX solar trough plant at the Plataforma Solar de Almería (PSA)...
Conference Paper
One of the most important problems in the operation of solar power towers is to achieve a uniform flux density distribution at the receiver, in order to avoid hot spots. An algorithm that computes the aim points for the heliostat field to obtain a uniform flux density distribution and optimize the solar irradiation collected by the receiver is pres...
Article
In this paper we propose an observer-based Model Predictive Control strategy for solar trough plants. The controller has been tested at the parabolic-trough field ACUREX at the Plataforma Solar de Almeria (PSA). Results of the tests carried out at the plant are presented. Furthermore, the performance of the proposed control strategy is compared to...
Article
One of the most important challenges in the use of solar energy is to make it economical. This can be done by reducing investment and operating costs and by increasing solar plants performance. This paper presents a three-layer hierarchical control strategy to optimize the operation of solar trough plants. The first layer deals with the operational...
Article
Full-text available
Solar cooling plants can work in multiple operation modes. A numerical model of the whole plant can be used to choose the adequate operation mode and optimizing the energy production by using hierarchical control strategies. Simplified models are required for solving the control problem in a suitable time-window using systems such as Programmable L...
Conference Paper
This paper addresses the design of an explicit model predictive controller for the outlet water temperature control of a solar cooling plant system that uses a field of Fresnel collectors. Solving multi-parametric quadratic programs~(mpQP) to obtain explicit solutions to constrained model predictive control~(MPC) problems enables the off-line desig...
Article
This work deals with the main control problems found in solar power systems and the solutions proposed in literature. The paper first describes the main solar power technologies, some of the control approaches and then describes the main challenges encountered when controlling solar power systems.
Article
Measurement of direct solar radiation has been shown to be very useful to improve control performance and disturbance rejection in solar fields by anticipating the effect of sudden changes in solar radiation due to clouds. Since direct solar radiation is measured locally by pyrheliometers, important errors in the estimation of the overall effective...
Article
Model Predictive control algorithms for trough solar plants make use of solar radiation measurements and the overall efficiency knowledge which are very useful in order to reject disturbances. However, direct solar radiation, mirror reflectivity and metal absorptance which affect overall efficiency, can only be measured locally. In this paper, an a...
Conference Paper
Full-text available
El avance en el diseño y estudio de los sistemas de energía termosolar, ha experimentado un gran auge en los últimos 30 años. Existen varios tipos de tecnología en plantas solares, la más común es la tecnología cilindro-parabólica. En este tipo de plantas, el objetivo es controlar la temperatura de salida de un fluido, generalmente un aceite térmic...
Conference Paper
Full-text available
En este artículo se presenta el modelado matemático, así como algoritmos de control de un captador solar tipo Fresnel que pertenece planta de refrigeración solar situada en la Escuela Superior de Ingenieros de la Universidad de Sevilla. Se va a desarrollar un modelo de parámetros distribuidos, ajustando los parámetros del mismo con datos tomados de...
Conference Paper
Full-text available
En este trabajo se aborda el control de un grupo 3x3 caldera turbina, el cual es multivariable, no lineal y posee fuerte interacción entre sus variables, así como fuertes restricciones en la amplitud y variación de las señales de control. Se propone abordar el problema de una manera distribuida, asociando cada variable de control a una variable fís...

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Projects (2)
Project
New control methods to use mobile sensors mounted on drones and unmanned ground vehicles (UGV) as an integral part of the control systems.
Archived project