Juan Carlos Travieso Torres | University Santiago of Chile (original) (raw)

Uploads

Papers by Juan Carlos Travieso Torres

Research paper thumbnail of Pitch Angle Control of an Airplane Using Fractional Order Direct Model Reference Adaptive Controllers

Fractal and Fractional

This paper deals with the longitudinal movement control of an airplane (pitch angle) using fracti... more This paper deals with the longitudinal movement control of an airplane (pitch angle) using fractional order adaptive controllers (FOACs). It shows the improvements achieved in the plane’s behavior, in terms of the minimization of a given performance index. At the same time, less control effort is needed to accomplish the control objectives compared with the classic integer order adaptive controllers (IOACs). In this study, fractional order direct model reference adaptive control (FO-DMRAC) is implemented at the simulation level, and exhibits a better performance compared with the classic integer order (IO) version of the DMRAC (IO-DMRAC). It is also shown that the proposed control strategy for FO-DMRAC reduces the resultant system control structure down to a relative degree 2 system, for which the control implementation is simpler and avoids oscillations during the transient period. Moreover, it is interesting to note that this is the first time that an FOAC with fractional adaptive...

Research paper thumbnail of Tracking control of cascade systems based on passivity: The nonadaptive and adaptive cases

A new cascade passivity-based control scheme for tracking purposes is proposed in this paper. The... more A new cascade passivity-based control scheme for tracking purposes is proposed in this paper. The proposed scheme is valid for a certain class of nonlinear systems even with unstable zero dynamic, and it is also useful for regulation and stabilization purposes. The cases where all system parameters are assumed to be known ͑nonadaptive case͒ and also the case when they are unknown ͑adaptive case͒ are considered. Some simulation examples are studied to analyze the behavior of the proposed scheme.

Research paper thumbnail of Experimental comparison of PBC for the level regulation of a conical tank

The techniques of adaptive passivity-based controller (APBC) and non-adaptive passivity-based con... more The techniques of adaptive passivity-based controller (APBC) and non-adaptive passivity-based controller (PBC), together with a PI controller, are applied to the level regulation of a conical tank. A comparative study considering the controller designs and experimental results is presented. A single APBC and PBC are designed for the whole operational range of the plant; whereas a PI controller with three different settings is used for level regulation at low, medium, and high operating points. The APBC design is simpler than the designs of PBC and the PI techniques, since no knowledge of the plant parameters is needed. Also, APBC is the only one showing robustness under variations of a plant parameter.

Research paper thumbnail of A novel induction motor control scheme using IDA-PBC

A new control scheme for induction motors is proposed in the present paper, applying the intercon... more A new control scheme for induction motors is proposed in the present paper, applying the interconnection and damping assignment-passivity based control (IDA-PBC) method. The scheme is based exclusively on passivity based control, without restricting the input frequency as it is done in field oriented control (FOC). A port-controlled Hamiltonian (PCH) model of the induction motor is deduced to make the interconnection and damping of energy explicit on the scheme. The proposed controller is validated under computational simulations and experimental tests using an inverter prototype.

Research paper thumbnail of New Adaptive High Starting Torque Scalar Control Scheme for Induction Motors Based on Passivity

A novel adaptive high starting torque (HST) scalar control scheme (SCS) for induction motors (IM)... more A novel adaptive high starting torque (HST) scalar control scheme (SCS) for induction motors (IM) is proposed in this paper. It uses a new adaptive-passivity-based controller (APBC) proposed herein for a class of nonlinear systems, with linear explicit parametric dependence and linear stable internal dynamics, which encompasses the IM dynamical model. The main advantage of the HST-SCS includes the ability to move loads with starting-torque over the nominal torque with a simple and cost-effective implementation without needing a rotor speed sensor, variable observers, or parameter estimators. The proposed APBC is based on a direct control scheme using a normalized fixed gain (FG) to fine-tune the adaptive controller parameters. The basic SCS for induction motors (IM) and the HST-SCS were applied to an IM of 200 HP and tested using a real-time simulator controller OPAL-RT showing the achievement of the proposal goal.

Research paper thumbnail of New Adaptive Starting Scalar Control Scheme for Induction Motor Variable Speed Drives

This article proposes a new scalar control scheme for variable speed drives of induction motors w... more This article proposes a new scalar control scheme for variable speed drives of induction motors with an adaptive starting control. Besides centrifugal pumps, blowers, and fans, it expands the scalar control application field to move, for instance, a class of conveyor belts with nominal torque loading. An adaptive passivity-based controller designed for a class of nonlinear systems encompassing the dynamical machine model keeps a constant stator starting current. The proposed methodology uses information from the motor nameplate. Hence, it keeps a simple control scheme, not needing parameter estimates, neither adjusting controllers nor variable observers depending on them. Experimental results with a 10 HP downscaled laboratory prototype validate the proposed control strategy effectiveness. It shows rated-starting torque capabilities and fast speed response. Moreover, it shows lower stator current consumption than previous scalar control schemes.

Research paper thumbnail of Review of Modular Multilevel Converters Applied to High Voltage AC and DC Transmission Systems

2022 IEEE International Conference on Automation/XXV Congress of the Chilean Association of Automatic Control (ICA-ACCA)

Research paper thumbnail of Experimental Assessment of a Modular Multilevel Converter using OPAL-RT Control and Power Stages for Low-Frequency AC transmission systems

2022 IEEE International Conference on Automation/XXV Congress of the Chilean Association of Automatic Control (ICA-ACCA)

Research paper thumbnail of EDRL-MDL: Metaheurística para el enrutamiento y asignación de longitud de onda en tráfico dinámico

espanolLas heuristicas utilizadas para la solucion del problema de enrutamiento y asignacion de l... more espanolLas heuristicas utilizadas para la solucion del problema de enrutamiento y asignacion de longitud de onda en redes opticas en escenarios dinamicos han tenido resultados parcialmente buenos y sobre todo no responden bien cuando son sometidas a estres. El presente articulo se propone una nueva estrategia llamada Snake-Two que utiliza el algoritmo Snake-One junto al monitoreo de los enlaces de la red, procurando concentrar el trafico en los sectores mas utilizados dejando mas disponibilidad en el resto de la red, esto permite que disminuya la probabilidad de bloqueo instantanea de las solicitudes entrantes a la red. Los resultados obtenidos mejoran la probabilidad de bloqueo media hasta en 37,7% de los resultados mas altos obtenidos; sin embargo, la utilizacion de la red continua su aumento. Estos resultados permiten garantizar que la atencion de solicitudes mejora para escenarios inferiores a los 140 Erlangs. EnglishThe heuristics used to solve the problem of routing and wavele...

Research paper thumbnail of Design and Implementation of a Low-Cost Real-Time Control Platform for Power Electronics Applications

Energies

In recent years, different off-the-shelf solutions for the rapid control prototyping of power ele... more In recent years, different off-the-shelf solutions for the rapid control prototyping of power electronics converters have been commercialised. The main benefits of those systems are based on a fast and easy-to-use environment due to high-level programming. However, most of those systems are very expensive and are closed software and hardware solutions. In this context, this paper presents the design and implementation of a control platform targeting at the segment in between expensive off-the-shelf control platforms and low-cost controllers. The control platform is based on the Launchpad TMS320F28379D from Texas Instruments, and it is equipped with an expansion board that provide analogue-to-digital measurements, switching signals and hardware protections. The performance of the control platform is experimentally tested on a 20 kVA power converter.

Research paper thumbnail of Control of induction motors: an adaptive passivity MIMO perspective

International Journal of Adaptive Control and Signal Processing, 2003

The design of two multiple-input multiple-output (MIMO) controllers for induction motors, based o... more The design of two multiple-input multiple-output (MIMO) controllers for induction motors, based on adaptive passivity, is presented in this paper. The controller design method is based on concepts of equivalence passivity via adaptive feedback, previously developed by the authors. Robustness under variations of the motor-load parameters is guaranteed and the knowledge of such a parameters is not needed in the design. Simple proportional controllers for the torque, rotor flux and stator current control loops are used, due to the control simplification introduced by the use of feedback passive equivalence. A principle called 'Torque-Flux Control Principle' is used in this article introducing a considerable simplification in the resultant controller. Because of the employment of this principle, the control efforts are diminished and rotor flux estimation (or measurement) is avoided.

Research paper thumbnail of Passivity-based control for stabilization, regulation and tracking purposes of a class of nonlinear systems

International Journal of Adaptive Control and Signal Processing, 2007

ABSTRACT In this paper, a new passivity-based control (PBC) scheme based on state feedback is pro... more ABSTRACT In this paper, a new passivity-based control (PBC) scheme based on state feedback is proposed in order to solve tracking, regulation and stabilization problems for a class of multi-input multi-output (MIMO) nonlinear systems expressed in the normal form, with time-invariant parameters and locally bounded reference weakly minimum phase. For the proposed control scheme two new different state feedbacks, one non-adaptive for the case when the system parameters are assumed to be known and the other adaptive for the case of unknown parameters, are developed. For the adaptive case it is assumed that the unknown parameters appear linearly in the equations. Analysis of the transient behaviour of the proposed control schemes is presented through the simulation of two examples. Copyright © 2006 John Wiley & Sons, Ltd.

Research paper thumbnail of Simplified robust adaptive control of a class of time-varying chaotic systems

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2008

Purpose-To develop a simplified robust control scheme for a class of nonlinear time-varying uncer... more Purpose-To develop a simplified robust control scheme for a class of nonlinear time-varying uncertain chaotic systems. Design/methodology/approach-By means of input-to-state stability theory, a new robust adaptive control scheme is designed, which is simpler than the one proposed by Li et al. and applicable to a larger class of nonlinear systems. Only one parameter is adjusted in the controller and the scheme assures that all the signals remain bounded. The behavior of the proposed control scheme is also analyzed through simulations on the Rössler system. Findings-By adjusting only one parameter in the controller and imposing only one mild assumption on the time-varying parameters, the proposed control algorithm assures that all the signal remain bounded and that the state of the original system will follow a desired trajectory defined either by the trajectory and its first time derivative, or given by a reference model. Research limitations/implications-The results are limited to a particular class of nonlinear systems where the dimension of the input vector is equal to the order of the system (dimension of the state vector). Practical implications-The main advantage of the proposed method is that the modification introduced leads to a substantially simpler adaptive robust controller whose practical implementation will be easier. Originality/value-The contribution of the proposed method is in the simplification of the control algorithm applied to a class of nonlinear time-varying uncertain chaotic systems. This will be useful for control engineers to control complex industrial plants.

Research paper thumbnail of Pitch Angle Control of an Airplane Using Fractional Order Direct Model Reference Adaptive Controllers

Fractal and Fractional

This paper deals with the longitudinal movement control of an airplane (pitch angle) using fracti... more This paper deals with the longitudinal movement control of an airplane (pitch angle) using fractional order adaptive controllers (FOACs). It shows the improvements achieved in the plane’s behavior, in terms of the minimization of a given performance index. At the same time, less control effort is needed to accomplish the control objectives compared with the classic integer order adaptive controllers (IOACs). In this study, fractional order direct model reference adaptive control (FO-DMRAC) is implemented at the simulation level, and exhibits a better performance compared with the classic integer order (IO) version of the DMRAC (IO-DMRAC). It is also shown that the proposed control strategy for FO-DMRAC reduces the resultant system control structure down to a relative degree 2 system, for which the control implementation is simpler and avoids oscillations during the transient period. Moreover, it is interesting to note that this is the first time that an FOAC with fractional adaptive...

Research paper thumbnail of Tracking control of cascade systems based on passivity: The nonadaptive and adaptive cases

A new cascade passivity-based control scheme for tracking purposes is proposed in this paper. The... more A new cascade passivity-based control scheme for tracking purposes is proposed in this paper. The proposed scheme is valid for a certain class of nonlinear systems even with unstable zero dynamic, and it is also useful for regulation and stabilization purposes. The cases where all system parameters are assumed to be known ͑nonadaptive case͒ and also the case when they are unknown ͑adaptive case͒ are considered. Some simulation examples are studied to analyze the behavior of the proposed scheme.

Research paper thumbnail of Experimental comparison of PBC for the level regulation of a conical tank

The techniques of adaptive passivity-based controller (APBC) and non-adaptive passivity-based con... more The techniques of adaptive passivity-based controller (APBC) and non-adaptive passivity-based controller (PBC), together with a PI controller, are applied to the level regulation of a conical tank. A comparative study considering the controller designs and experimental results is presented. A single APBC and PBC are designed for the whole operational range of the plant; whereas a PI controller with three different settings is used for level regulation at low, medium, and high operating points. The APBC design is simpler than the designs of PBC and the PI techniques, since no knowledge of the plant parameters is needed. Also, APBC is the only one showing robustness under variations of a plant parameter.

Research paper thumbnail of A novel induction motor control scheme using IDA-PBC

A new control scheme for induction motors is proposed in the present paper, applying the intercon... more A new control scheme for induction motors is proposed in the present paper, applying the interconnection and damping assignment-passivity based control (IDA-PBC) method. The scheme is based exclusively on passivity based control, without restricting the input frequency as it is done in field oriented control (FOC). A port-controlled Hamiltonian (PCH) model of the induction motor is deduced to make the interconnection and damping of energy explicit on the scheme. The proposed controller is validated under computational simulations and experimental tests using an inverter prototype.

Research paper thumbnail of New Adaptive High Starting Torque Scalar Control Scheme for Induction Motors Based on Passivity

A novel adaptive high starting torque (HST) scalar control scheme (SCS) for induction motors (IM)... more A novel adaptive high starting torque (HST) scalar control scheme (SCS) for induction motors (IM) is proposed in this paper. It uses a new adaptive-passivity-based controller (APBC) proposed herein for a class of nonlinear systems, with linear explicit parametric dependence and linear stable internal dynamics, which encompasses the IM dynamical model. The main advantage of the HST-SCS includes the ability to move loads with starting-torque over the nominal torque with a simple and cost-effective implementation without needing a rotor speed sensor, variable observers, or parameter estimators. The proposed APBC is based on a direct control scheme using a normalized fixed gain (FG) to fine-tune the adaptive controller parameters. The basic SCS for induction motors (IM) and the HST-SCS were applied to an IM of 200 HP and tested using a real-time simulator controller OPAL-RT showing the achievement of the proposal goal.

Research paper thumbnail of New Adaptive Starting Scalar Control Scheme for Induction Motor Variable Speed Drives

This article proposes a new scalar control scheme for variable speed drives of induction motors w... more This article proposes a new scalar control scheme for variable speed drives of induction motors with an adaptive starting control. Besides centrifugal pumps, blowers, and fans, it expands the scalar control application field to move, for instance, a class of conveyor belts with nominal torque loading. An adaptive passivity-based controller designed for a class of nonlinear systems encompassing the dynamical machine model keeps a constant stator starting current. The proposed methodology uses information from the motor nameplate. Hence, it keeps a simple control scheme, not needing parameter estimates, neither adjusting controllers nor variable observers depending on them. Experimental results with a 10 HP downscaled laboratory prototype validate the proposed control strategy effectiveness. It shows rated-starting torque capabilities and fast speed response. Moreover, it shows lower stator current consumption than previous scalar control schemes.

Research paper thumbnail of Review of Modular Multilevel Converters Applied to High Voltage AC and DC Transmission Systems

2022 IEEE International Conference on Automation/XXV Congress of the Chilean Association of Automatic Control (ICA-ACCA)

Research paper thumbnail of Experimental Assessment of a Modular Multilevel Converter using OPAL-RT Control and Power Stages for Low-Frequency AC transmission systems

2022 IEEE International Conference on Automation/XXV Congress of the Chilean Association of Automatic Control (ICA-ACCA)

Research paper thumbnail of EDRL-MDL: Metaheurística para el enrutamiento y asignación de longitud de onda en tráfico dinámico

espanolLas heuristicas utilizadas para la solucion del problema de enrutamiento y asignacion de l... more espanolLas heuristicas utilizadas para la solucion del problema de enrutamiento y asignacion de longitud de onda en redes opticas en escenarios dinamicos han tenido resultados parcialmente buenos y sobre todo no responden bien cuando son sometidas a estres. El presente articulo se propone una nueva estrategia llamada Snake-Two que utiliza el algoritmo Snake-One junto al monitoreo de los enlaces de la red, procurando concentrar el trafico en los sectores mas utilizados dejando mas disponibilidad en el resto de la red, esto permite que disminuya la probabilidad de bloqueo instantanea de las solicitudes entrantes a la red. Los resultados obtenidos mejoran la probabilidad de bloqueo media hasta en 37,7% de los resultados mas altos obtenidos; sin embargo, la utilizacion de la red continua su aumento. Estos resultados permiten garantizar que la atencion de solicitudes mejora para escenarios inferiores a los 140 Erlangs. EnglishThe heuristics used to solve the problem of routing and wavele...

Research paper thumbnail of Design and Implementation of a Low-Cost Real-Time Control Platform for Power Electronics Applications

Energies

In recent years, different off-the-shelf solutions for the rapid control prototyping of power ele... more In recent years, different off-the-shelf solutions for the rapid control prototyping of power electronics converters have been commercialised. The main benefits of those systems are based on a fast and easy-to-use environment due to high-level programming. However, most of those systems are very expensive and are closed software and hardware solutions. In this context, this paper presents the design and implementation of a control platform targeting at the segment in between expensive off-the-shelf control platforms and low-cost controllers. The control platform is based on the Launchpad TMS320F28379D from Texas Instruments, and it is equipped with an expansion board that provide analogue-to-digital measurements, switching signals and hardware protections. The performance of the control platform is experimentally tested on a 20 kVA power converter.

Research paper thumbnail of Control of induction motors: an adaptive passivity MIMO perspective

International Journal of Adaptive Control and Signal Processing, 2003

The design of two multiple-input multiple-output (MIMO) controllers for induction motors, based o... more The design of two multiple-input multiple-output (MIMO) controllers for induction motors, based on adaptive passivity, is presented in this paper. The controller design method is based on concepts of equivalence passivity via adaptive feedback, previously developed by the authors. Robustness under variations of the motor-load parameters is guaranteed and the knowledge of such a parameters is not needed in the design. Simple proportional controllers for the torque, rotor flux and stator current control loops are used, due to the control simplification introduced by the use of feedback passive equivalence. A principle called 'Torque-Flux Control Principle' is used in this article introducing a considerable simplification in the resultant controller. Because of the employment of this principle, the control efforts are diminished and rotor flux estimation (or measurement) is avoided.

Research paper thumbnail of Passivity-based control for stabilization, regulation and tracking purposes of a class of nonlinear systems

International Journal of Adaptive Control and Signal Processing, 2007

ABSTRACT In this paper, a new passivity-based control (PBC) scheme based on state feedback is pro... more ABSTRACT In this paper, a new passivity-based control (PBC) scheme based on state feedback is proposed in order to solve tracking, regulation and stabilization problems for a class of multi-input multi-output (MIMO) nonlinear systems expressed in the normal form, with time-invariant parameters and locally bounded reference weakly minimum phase. For the proposed control scheme two new different state feedbacks, one non-adaptive for the case when the system parameters are assumed to be known and the other adaptive for the case of unknown parameters, are developed. For the adaptive case it is assumed that the unknown parameters appear linearly in the equations. Analysis of the transient behaviour of the proposed control schemes is presented through the simulation of two examples. Copyright © 2006 John Wiley & Sons, Ltd.

Research paper thumbnail of Simplified robust adaptive control of a class of time-varying chaotic systems

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2008

Purpose-To develop a simplified robust control scheme for a class of nonlinear time-varying uncer... more Purpose-To develop a simplified robust control scheme for a class of nonlinear time-varying uncertain chaotic systems. Design/methodology/approach-By means of input-to-state stability theory, a new robust adaptive control scheme is designed, which is simpler than the one proposed by Li et al. and applicable to a larger class of nonlinear systems. Only one parameter is adjusted in the controller and the scheme assures that all the signals remain bounded. The behavior of the proposed control scheme is also analyzed through simulations on the Rössler system. Findings-By adjusting only one parameter in the controller and imposing only one mild assumption on the time-varying parameters, the proposed control algorithm assures that all the signal remain bounded and that the state of the original system will follow a desired trajectory defined either by the trajectory and its first time derivative, or given by a reference model. Research limitations/implications-The results are limited to a particular class of nonlinear systems where the dimension of the input vector is equal to the order of the system (dimension of the state vector). Practical implications-The main advantage of the proposed method is that the modification introduced leads to a substantially simpler adaptive robust controller whose practical implementation will be easier. Originality/value-The contribution of the proposed method is in the simplification of the control algorithm applied to a class of nonlinear time-varying uncertain chaotic systems. This will be useful for control engineers to control complex industrial plants.