Se desarrollo un prototipo de emulador de celdas de combustible (FC). El trabajo esta enmarcado e... more Se desarrollo un prototipo de emulador de celdas de combustible (FC). El trabajo esta enmarcado en la construccion de un sistema de generacion hibrido (SGH). El profundo estudio de los sistemas de FCs en el marco de los SGH permitio la modelizacion, simulacion y puesta en practica del diseno propuesto. Se utilizo un convertidor reductor como soporte fisico del emulador, cuyos algoritmos de control se aplicaron mediante un controlador digital de senales. Se implementaron dos modelos diferentes de caracteristica corriente-tension. El primer caso, de parametros fijos y que solo contempla la variacion de tension en funcion de la corriente entregada; el segundo caso, con ajuste variable de algunos de estos parametros. Se presentan pruebas experimentales que permitieron validar el adecuado funcionamiento del emulador en forma independiente y como parte del SGH. El dispositivo resultante pretende asistir en el desarrollo de sistemas de generacion alternativos y limpios al ofrecer un dispo...
Microgrids are versatile systems for integration of renewable energy sources and non-conventional... more Microgrids are versatile systems for integration of renewable energy sources and non-conventional storage devices. Sliding Mode techniques grant excellent features of robustness controlling power conditioning systems, making them highly suitable for microgrid applications. However, problems may arise when a converter is set to behave as a Constant Power Load (CPL). These issues manifest in the stability of internal dynamics (or Zero Dynamics), which is determined by the input filter of the power module. In this paper, a special Lyapunov analysis is conducted to address the nonlinear internal dynamics of SM controlled power modules with CPL. It takes advantage of a Liérnad-type description, establishing stability conditions and providing a secure operation region. These conditions are translated into conductance and invariant region diagrams, turning them into tools for the design of power module filters.
This paper presents an energy-based model of a series hybrid electric vehicle. The proposed propu... more This paper presents an energy-based model of a series hybrid electric vehicle. The proposed propulsion system has a new configuration using a wound-rotor synchronous generator (WRSM) and a doubly-fed induction machine (DFIM). From the classic dq dynamical equations of the WRSM and DFIM the port-controlled Hamiltonian models of each machine is described. One of the abilities of the port-based models is that the complete model is easy to obtain by means of interconnection rules. Following this, the Hamiltonian model of the whole system is obtained. Similarly, the bond graph approach allows to build a complex model by interconnecting several subsystems. This paper also contains bond graph models of the machines and the propulsion system. Numerical simulations are also presented in order to validate the proposed models.
2018 15th International Workshop on Variable Structure Systems (VSS), 2018
This paper proposes a new control scheme for a non-standard wind turbines system, that comprises ... more This paper proposes a new control scheme for a non-standard wind turbines system, that comprises two identical wind turbines and has no yaw actuator to ensure the alignment face to the wind. Furthermore, the controller based on super-twisting algorithm is a sensorless one, in the sense that it does not require wind speed measurement. Such feature is attained thanks to the use of a very recent differentiation approach. The performance of the proposed controller is assessed by simulation.
Ocean waves are an important renewable energy resource and several fields of R & D are concur... more Ocean waves are an important renewable energy resource and several fields of R & D are concurrently working to improve technologies for harnessing their power. In that context, this study presents a control to optimise the performance of oscillating water column systems. As a first contribution, a novel criterion to attain maximum wave energy extraction is developed, resulting in an enhancement of the global power efficiency of the system. Then, taking advantage of the proposed criterion, a second-order sliding mode control set-up is designed, with power extraction maximisation the primary objective and reactive power regulation a secondary one. Simulation results confirm the highly satisfactory performance of the proposed controller and its robustness in the presence of the inherent uncertainties and disturbances in the non-linear system.
Microgrids are versatile systems for integration of renewable energy sources and non-conventional... more Microgrids are versatile systems for integration of renewable energy sources and non-conventional storage devices. Sliding Mode techniques grant excellent features of robustness controlling power conditioning systems, making them highly suitable for microgrid applications. However, problems may arise when a converter is set to behave as a Constant Power Load (CPL). These issues manifest in the stability of internal dynamics (or Zero Dynamics), which is determined by the input filter of the power module. In this paper, a special Lyapunov analysis is conducted to address the nonlinear internal dynamics of SM controlled power modules with CPL. It takes advantage of a Liérnad-type description, establishing stability conditions and providing a secure operation region. These conditions are translated into conductance and invariant region diagrams, turning them into tools for the design of power module filters.
2014 13th International Workshop on Variable Structure Systems (VSS), 2014
ABSTRACT This work presents a controller based on a Super-Twisting (ST) algorithm with variable g... more ABSTRACT This work presents a controller based on a Super-Twisting (ST) algorithm with variable gains, designed to maximize the efficiency of a fuel cell (FC). The strategy consists on regulating the oxygen excess ratio, maintaining it at an optimum value in spite of external disturbances and model uncertainties. The tested algorithm has the well-known advantages of the original ST with fixed gains, such as simplicity, robustness against uncertainty and disturbances, reduced chattering and finite time convergence. In addition, the variability of its gains allows expanding the range of operation, without a significant increase in the complexity of the control law. The adjustment of the gains is based on certain variable bounding functions, which have to be determined analysing the system and its characteristics. This process is laborious for a non-linear system like the FC, but is performed off-line during the design stage. Promising results have been obtained through exhausting simulation tests, considering model uncertainties and highly variable load regimes.
2012 12th International Workshop on Variable Structure Systems, 2012
This paper presents a robust controller for an internal combustion (IC) engine, as a first stage ... more This paper presents a robust controller for an internal combustion (IC) engine, as a first stage of a project aiming at developing a hybrid light urban vehicle, running with ethanol in lean burn. This work particularly focuses on the design of a sliding mode control for the IC engine of a series hybrid power-train. The controller must allow for speed
Se desarrollo un prototipo de emulador de celdas de combustible (FC). El trabajo esta enmarcado e... more Se desarrollo un prototipo de emulador de celdas de combustible (FC). El trabajo esta enmarcado en la construccion de un sistema de generacion hibrido (SGH). El profundo estudio de los sistemas de FCs en el marco de los SGH permitio la modelizacion, simulacion y puesta en practica del diseno propuesto. Se utilizo un convertidor reductor como soporte fisico del emulador, cuyos algoritmos de control se aplicaron mediante un controlador digital de senales. Se implementaron dos modelos diferentes de caracteristica corriente-tension. El primer caso, de parametros fijos y que solo contempla la variacion de tension en funcion de la corriente entregada; el segundo caso, con ajuste variable de algunos de estos parametros. Se presentan pruebas experimentales que permitieron validar el adecuado funcionamiento del emulador en forma independiente y como parte del SGH. El dispositivo resultante pretende asistir en el desarrollo de sistemas de generacion alternativos y limpios al ofrecer un dispo...
Microgrids are versatile systems for integration of renewable energy sources and non-conventional... more Microgrids are versatile systems for integration of renewable energy sources and non-conventional storage devices. Sliding Mode techniques grant excellent features of robustness controlling power conditioning systems, making them highly suitable for microgrid applications. However, problems may arise when a converter is set to behave as a Constant Power Load (CPL). These issues manifest in the stability of internal dynamics (or Zero Dynamics), which is determined by the input filter of the power module. In this paper, a special Lyapunov analysis is conducted to address the nonlinear internal dynamics of SM controlled power modules with CPL. It takes advantage of a Liérnad-type description, establishing stability conditions and providing a secure operation region. These conditions are translated into conductance and invariant region diagrams, turning them into tools for the design of power module filters.
This paper presents an energy-based model of a series hybrid electric vehicle. The proposed propu... more This paper presents an energy-based model of a series hybrid electric vehicle. The proposed propulsion system has a new configuration using a wound-rotor synchronous generator (WRSM) and a doubly-fed induction machine (DFIM). From the classic dq dynamical equations of the WRSM and DFIM the port-controlled Hamiltonian models of each machine is described. One of the abilities of the port-based models is that the complete model is easy to obtain by means of interconnection rules. Following this, the Hamiltonian model of the whole system is obtained. Similarly, the bond graph approach allows to build a complex model by interconnecting several subsystems. This paper also contains bond graph models of the machines and the propulsion system. Numerical simulations are also presented in order to validate the proposed models.
2018 15th International Workshop on Variable Structure Systems (VSS), 2018
This paper proposes a new control scheme for a non-standard wind turbines system, that comprises ... more This paper proposes a new control scheme for a non-standard wind turbines system, that comprises two identical wind turbines and has no yaw actuator to ensure the alignment face to the wind. Furthermore, the controller based on super-twisting algorithm is a sensorless one, in the sense that it does not require wind speed measurement. Such feature is attained thanks to the use of a very recent differentiation approach. The performance of the proposed controller is assessed by simulation.
Ocean waves are an important renewable energy resource and several fields of R & D are concur... more Ocean waves are an important renewable energy resource and several fields of R & D are concurrently working to improve technologies for harnessing their power. In that context, this study presents a control to optimise the performance of oscillating water column systems. As a first contribution, a novel criterion to attain maximum wave energy extraction is developed, resulting in an enhancement of the global power efficiency of the system. Then, taking advantage of the proposed criterion, a second-order sliding mode control set-up is designed, with power extraction maximisation the primary objective and reactive power regulation a secondary one. Simulation results confirm the highly satisfactory performance of the proposed controller and its robustness in the presence of the inherent uncertainties and disturbances in the non-linear system.
Microgrids are versatile systems for integration of renewable energy sources and non-conventional... more Microgrids are versatile systems for integration of renewable energy sources and non-conventional storage devices. Sliding Mode techniques grant excellent features of robustness controlling power conditioning systems, making them highly suitable for microgrid applications. However, problems may arise when a converter is set to behave as a Constant Power Load (CPL). These issues manifest in the stability of internal dynamics (or Zero Dynamics), which is determined by the input filter of the power module. In this paper, a special Lyapunov analysis is conducted to address the nonlinear internal dynamics of SM controlled power modules with CPL. It takes advantage of a Liérnad-type description, establishing stability conditions and providing a secure operation region. These conditions are translated into conductance and invariant region diagrams, turning them into tools for the design of power module filters.
2014 13th International Workshop on Variable Structure Systems (VSS), 2014
ABSTRACT This work presents a controller based on a Super-Twisting (ST) algorithm with variable g... more ABSTRACT This work presents a controller based on a Super-Twisting (ST) algorithm with variable gains, designed to maximize the efficiency of a fuel cell (FC). The strategy consists on regulating the oxygen excess ratio, maintaining it at an optimum value in spite of external disturbances and model uncertainties. The tested algorithm has the well-known advantages of the original ST with fixed gains, such as simplicity, robustness against uncertainty and disturbances, reduced chattering and finite time convergence. In addition, the variability of its gains allows expanding the range of operation, without a significant increase in the complexity of the control law. The adjustment of the gains is based on certain variable bounding functions, which have to be determined analysing the system and its characteristics. This process is laborious for a non-linear system like the FC, but is performed off-line during the design stage. Promising results have been obtained through exhausting simulation tests, considering model uncertainties and highly variable load regimes.
2012 12th International Workshop on Variable Structure Systems, 2012
This paper presents a robust controller for an internal combustion (IC) engine, as a first stage ... more This paper presents a robust controller for an internal combustion (IC) engine, as a first stage of a project aiming at developing a hybrid light urban vehicle, running with ethanol in lean burn. This work particularly focuses on the design of a sliding mode control for the IC engine of a series hybrid power-train. The controller must allow for speed
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