Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421183
Ricardo Meneses Gonzalez, R. L. Miranda, Laura Montes
Radio Frequency Identification (RFID) Systems are a wireless communication. Recently they are being applied to vehicular identification in road and freeways. This motivates the analysis of the propagation environment for outdoor in such systems. The RFID Systems that are used for the vehicular identification consists of the reader, the tag and the radio channel which is made up on the ground (asphalt), the free space and surrounded by irregular walls (buses, vans, sport cars, etc., located at adjacent lanes). In this work, the radio channel considering a tunnel environment and modeling as a waveguide is analyzed, in order to obtain the electromagnetic performance of the radio channel. The results show that the proposed model is suitable.
{"title":"Modeling the RFID radio channel applied to vehicular identification as a waveguide environment","authors":"Ricardo Meneses Gonzalez, R. L. Miranda, Laura Montes","doi":"10.1109/ICEEE.2012.6421183","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421183","url":null,"abstract":"Radio Frequency Identification (RFID) Systems are a wireless communication. Recently they are being applied to vehicular identification in road and freeways. This motivates the analysis of the propagation environment for outdoor in such systems. The RFID Systems that are used for the vehicular identification consists of the reader, the tag and the radio channel which is made up on the ground (asphalt), the free space and surrounded by irregular walls (buses, vans, sport cars, etc., located at adjacent lanes). In this work, the radio channel considering a tunnel environment and modeling as a waveguide is analyzed, in order to obtain the electromagnetic performance of the radio channel. The results show that the proposed model is suitable.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130557512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421196
Jovan O. Merida, J. Dávila, L. Aguilar
In this paper, a quasi-continuous sliding-mode strategy is done which solves the problem of power generation for variable speed wind turbine systems. The control objective is to maximize the extracted energy from the wind while mechanical loads are reduced. The properties of the proposed controller are robustness to parametric uncertainties of the turbine, robustness with respect to external disturbances, robustness to unmodeled dynamics and accuracy, with an accuracy of higher order and finite reaching time. The high-order sliding-mode controller is applied to reduce the effects of chattering in the generated torque that could lead to increased mechanical stress because of strong torque variations. We use a realistic model which takes into account the nonlinear dynamic aspect of the wind turbine and the turbulent nature of the wind. We assume that only the rotor speed and electric power are available from measurements on the wind turbine. In order to validate the mathematical model and evaluate the performance of proposed controller, we used the National Renewable Energy Laboratory aeroelastic wind turbine simulator FAST. Simulation and validation results show that the proposed control strategy has improvements in comparison with the existing controllers.
{"title":"Robust quasi-continuous sliding-mode control of a variable-speed wind turbine","authors":"Jovan O. Merida, J. Dávila, L. Aguilar","doi":"10.1109/ICEEE.2012.6421196","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421196","url":null,"abstract":"In this paper, a quasi-continuous sliding-mode strategy is done which solves the problem of power generation for variable speed wind turbine systems. The control objective is to maximize the extracted energy from the wind while mechanical loads are reduced. The properties of the proposed controller are robustness to parametric uncertainties of the turbine, robustness with respect to external disturbances, robustness to unmodeled dynamics and accuracy, with an accuracy of higher order and finite reaching time. The high-order sliding-mode controller is applied to reduce the effects of chattering in the generated torque that could lead to increased mechanical stress because of strong torque variations. We use a realistic model which takes into account the nonlinear dynamic aspect of the wind turbine and the turbulent nature of the wind. We assume that only the rotor speed and electric power are available from measurements on the wind turbine. In order to validate the mathematical model and evaluate the performance of proposed controller, we used the National Renewable Energy Laboratory aeroelastic wind turbine simulator FAST. Simulation and validation results show that the proposed control strategy has improvements in comparison with the existing controllers.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121158774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421142
A. Gárate-García, Susana Vázquez Vallín, Luis Alejandro Marquez Martinez
A methodology to solve the trajectory tracking problem for systems with a noisy position signal is proposed in this paper. Such signal is obtained from a direct measurement, and must be filtered to reduce unwanted noise, and to estimate its time-derivative. It is shown that the use of delay-differential error equations is instrumental to achieve the stability despite a constant delay, which is inherent to the filtering process.
{"title":"Delayed-error equations for controller design","authors":"A. Gárate-García, Susana Vázquez Vallín, Luis Alejandro Marquez Martinez","doi":"10.1109/ICEEE.2012.6421142","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421142","url":null,"abstract":"A methodology to solve the trajectory tracking problem for systems with a noisy position signal is proposed in this paper. Such signal is obtained from a direct measurement, and must be filtered to reduce unwanted noise, and to estimate its time-derivative. It is shown that the use of delay-differential error equations is instrumental to achieve the stability despite a constant delay, which is inherent to the filtering process.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114796797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421162
R. Sierra, J. Alcalá, V. Cárdenas, J. Perez-Ramirez, A. Rivera
In this work, a control structure to maintain the power flow transference in renewable energy systems based on wind turbines operating under unbalanced voltage conditions is presented. In the proposed scheme, the Back-to-Back (BTB) converter preserves the electrical cogeneration under the occurrence of voltage sags type B, C and D in three-phase systems. The control modeling is developed in the dq reference frame and two control schemes are proposed to control the BTB converter. A per-phase analysis at the interconnected grid side is considered; on the other hand, for the load side, a three-phase analysis is established. The effectiveness of the BTB converter to compensate voltage sags is shown through simulation and experimental results.
{"title":"Evaluating the performance of the BTB converter under unbalanced voltage sags","authors":"R. Sierra, J. Alcalá, V. Cárdenas, J. Perez-Ramirez, A. Rivera","doi":"10.1109/ICEEE.2012.6421162","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421162","url":null,"abstract":"In this work, a control structure to maintain the power flow transference in renewable energy systems based on wind turbines operating under unbalanced voltage conditions is presented. In the proposed scheme, the Back-to-Back (BTB) converter preserves the electrical cogeneration under the occurrence of voltage sags type B, C and D in three-phase systems. The control modeling is developed in the dq reference frame and two control schemes are proposed to control the BTB converter. A per-phase analysis at the interconnected grid side is considered; on the other hand, for the load side, a three-phase analysis is established. The effectiveness of the BTB converter to compensate voltage sags is shown through simulation and experimental results.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"47 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126002640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421140
René Galindo-Orozco, Cutberto Daniel Conejo-Rosas
Explicit formulas of the Parametrization of All one parameter Stabilizing Controllers (PASC) for square systems, are presented. Multi Input Multi Output (MIMO), strictly proper, lumped and Linear Time Invariant (LTI) systems with stabilizable and detectable realizations are considered. It is assumed that the state dimension is even, the input dimension is half the state dimension, and the plant is strongly stabilizable and detectable. The separation principle is applied to design a dynamic output control in a controller-observer feedback configuration. The results for the observer are gotten by duality. For both controller and observer, right and left coprime factorizations of the transfer function in terms of the state space realization are proposed, right and left Diophantine equations are solved, and the controller and observer belong to the PASC. Conditions to get strong stability are given and the free parameters of the stabilizing controllers are fixed solving a MIxed Sensitivity Problem (MISP). The results are illustrated through a simulation example of a two-cart system.
{"title":"A Parametrization of all one parameter stabilizing controllers and a mixed sensitivity problem, for square systems","authors":"René Galindo-Orozco, Cutberto Daniel Conejo-Rosas","doi":"10.1109/ICEEE.2012.6421140","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421140","url":null,"abstract":"Explicit formulas of the Parametrization of All one parameter Stabilizing Controllers (PASC) for square systems, are presented. Multi Input Multi Output (MIMO), strictly proper, lumped and Linear Time Invariant (LTI) systems with stabilizable and detectable realizations are considered. It is assumed that the state dimension is even, the input dimension is half the state dimension, and the plant is strongly stabilizable and detectable. The separation principle is applied to design a dynamic output control in a controller-observer feedback configuration. The results for the observer are gotten by duality. For both controller and observer, right and left coprime factorizations of the transfer function in terms of the state space realization are proposed, right and left Diophantine equations are solved, and the controller and observer belong to the PASC. Conditions to get strong stability are given and the free parameters of the stabilizing controllers are fixed solving a MIxed Sensitivity Problem (MISP). The results are illustrated through a simulation example of a two-cart system.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132688228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421138
Eduardo Martínez-Zambrano, René Galindo-Orozco
This paper presents an alternative methodology to solve the quadratic stabilization problem via parameter dependent state feedback. Sufficient conditions for Quadratic Stability by parameter dependent state feedback are given, the LPV control law is gotten by a parameter dependent interpolation of LTI controllers (one for each vertex) solving the regulation problem. This technique is proved using an upper bound of the parameter dependent Lyapunov function of the system. The results are illustrated by a simulation example of a two-cart system.
{"title":"Quadratic Stability methodology by parameter dependent state feedback for LPV systems","authors":"Eduardo Martínez-Zambrano, René Galindo-Orozco","doi":"10.1109/ICEEE.2012.6421138","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421138","url":null,"abstract":"This paper presents an alternative methodology to solve the quadratic stabilization problem via parameter dependent state feedback. Sufficient conditions for Quadratic Stability by parameter dependent state feedback are given, the LPV control law is gotten by a parameter dependent interpolation of LTI controllers (one for each vertex) solving the regulation problem. This technique is proved using an upper bound of the parameter dependent Lyapunov function of the system. The results are illustrated by a simulation example of a two-cart system.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"370 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115910118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421148
J. González-Sierra, E. Aranda-Bricaire, H. Rodríguez-Cortés
This paper presents three trajectory tracking control strategies for groups unicycle-type robots based on the leader-followers scheme using an observer to estimate the orientation angle of each robot. The leader robot converges asymptotically to a smooth trajectory while the follower robots are formed in an undirected open-chain configuration at the same time. The control laws are based on a dynamical extension of the kinematic model of each robot. The output functions to be controlled are the midpoint of the wheels axis of each robot. This choice leads to an ill defined control law when the robot is at rest. To avoid such singularities, a complementary control law is enabled momentarily when the linear velocity of the unicycles is close to zero. Numerical simulations complete the paper.
{"title":"Attitude observer and trajectory tracking for a group of unicycle-type robots","authors":"J. González-Sierra, E. Aranda-Bricaire, H. Rodríguez-Cortés","doi":"10.1109/ICEEE.2012.6421148","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421148","url":null,"abstract":"This paper presents three trajectory tracking control strategies for groups unicycle-type robots based on the leader-followers scheme using an observer to estimate the orientation angle of each robot. The leader robot converges asymptotically to a smooth trajectory while the follower robots are formed in an undirected open-chain configuration at the same time. The control laws are based on a dynamical extension of the kinematic model of each robot. The output functions to be controlled are the midpoint of the wheels axis of each robot. This choice leads to an ill defined control law when the robot is at rest. To avoid such singularities, a complementary control law is enabled momentarily when the linear velocity of the unicycles is close to zero. Numerical simulations complete the paper.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116920763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421179
E. Aranda-Bricaire, D. E. Mendoza, G. R. Peñaloza-Mendoza
This paper presents an experimental comparison between discrete- and continuous-time formation and marching controllers for Multi-Agent Systems. The analysis is applied to the kinematic model of unicycle-type robots where the output function is a point off the robots' wheels axis. The control strategies are based on Artificial Potential Functions. The discrete-time model is obtained using Euler approximation. The comparison is made by matching the sum of the control signals of all the robots. Since there is an algebraic relation between the control signals and the energy applied to the system, if the overall control is equal for both schemes then the errors of the discrete- and continuous-time schemes can be compared.
{"title":"Experimental comparison between discrete- and continuous-time controllers for multi-agent robots systems","authors":"E. Aranda-Bricaire, D. E. Mendoza, G. R. Peñaloza-Mendoza","doi":"10.1109/ICEEE.2012.6421179","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421179","url":null,"abstract":"This paper presents an experimental comparison between discrete- and continuous-time formation and marching controllers for Multi-Agent Systems. The analysis is applied to the kinematic model of unicycle-type robots where the output function is a point off the robots' wheels axis. The control strategies are based on Artificial Potential Functions. The discrete-time model is obtained using Euler approximation. The comparison is made by matching the sum of the control signals of all the robots. Since there is an algebraic relation between the control signals and the energy applied to the system, if the overall control is equal for both schemes then the errors of the discrete- and continuous-time schemes can be compared.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123540709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/ICEEE.2012.6421169
I. Carmona, J. Torres-Muñoz, A. R. Dominguez-Bocanegra
The optimal microalgae growth problem of the photosynthetic factory (PSF) is studied here. The objective is to maximize the photosynthetic production rate (related proportionally to the specific growth rate of microalgae) by manipulating the irradiance. Since microalgae growth is affected by slow and fast dynamics, an optimal control on the well known reduced model is shown. Since the optimal control obtained does not depend on the states of the system but only in the time, it can be assumed as an open loop control. This is an important result because measure cost can be omitted.
{"title":"Optimal growth by dynamic programming approach for reduced system for the microalgae culture","authors":"I. Carmona, J. Torres-Muñoz, A. R. Dominguez-Bocanegra","doi":"10.1109/ICEEE.2012.6421169","DOIUrl":"https://doi.org/10.1109/ICEEE.2012.6421169","url":null,"abstract":"The optimal microalgae growth problem of the photosynthetic factory (PSF) is studied here. The objective is to maximize the photosynthetic production rate (related proportionally to the specific growth rate of microalgae) by manipulating the irradiance. Since microalgae growth is affected by slow and fast dynamics, an optimal control on the well known reduced model is shown. Since the optimal control obtained does not depend on the states of the system but only in the time, it can be assumed as an open loop control. This is an important result because measure cost can be omitted.","PeriodicalId":162368,"journal":{"name":"2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122144549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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