ABSTRACT This paper presents a trajectory-based online control reconfiguration mechanism against ... more ABSTRACT This paper presents a trajectory-based online control reconfiguration mechanism against unknown fault occurring in an electric circuit. First, we demonstrate the modeling of an electric circuit by taking the time-trajectory viewpoint, where no a priori input–output partition has been made. The uniqueness of this viewpoint lies in the fact that it deals only with variables that describe the system without any dedicated (external or internal -type) representation. Subsequently, we illustrate a novel real-time fault-tolerant control (FTC) strategy based on this trajectory standpoint, which does not require an explicit model-based fault diagnosis unit. Instead, the controller is reconfigured directly based on the trajectories generated by the system in real-time, and the given control specifications. In this way, we efficiently excrete the shortcomings that are often seen in model-based fault-tolerant systems. The proposed FTC method is effectively demonstrated on an RLC circuit.
Abstract—In this note, we discuss a performance-based su-pervisor for the fault tolerant control ... more Abstract—In this note, we discuss a performance-based su-pervisor for the fault tolerant control (FTC). We conduct the notion of stability, which is often misinterpreted in our approach with the classical arbitrary switching control. Moreover, we only deal with the trajectories generated by the system in real time and we do not have any access to plant parameters, states of the system etc. Thus, we clearly distinguished this notion employed in both the approaches. A novel switching logic is also proposed that root out the problems ...
ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine... more ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine system such that it can generate the rated power at anytime. This mechanism lies under the taxonomy of Active Fault-Tolerant Control (AFTC) system, namely projection-based approach. In the proposed approach, we do not use any a priori information about the model of the plant in real-time. In fact, we use the online measurements generated by the plant. Based on the given control objectives, and the observed measurements, the controller is re-configured such that the turbine can generate the rated power even under faulty conditions. Secondly, no use of an explicit fault-diagnosis module is seen in this approach. The benchmark model for the Wind Turbine is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's (NREL) National Wind Turbine Center.
2013 Conference on Control and Fault-Tolerant Systems (SysTol), 2013
ABSTRACT The aims of this paper are two folds. First, we aim to gain some insights at the time Tr... more ABSTRACT The aims of this paper are two folds. First, we aim to gain some insights at the time Trajectory-based Active Fault-Tolerant Control (TAFTC) using the frequency spectrum analysis. Secondly, we introduce the concept of finite-time stability (FTS) in the context of AFTC systems. Generally, in TAFTC strategy, the desired specifications are defined in terms of time-domain characteristics under the mathematical framework of behavioral system theory. In this novel fault-tolerant mechanism, we do not work in the traditional input/output setting, i.e. the frequency-domain, at the outset. Instead, we use the system time-trajectories. As an extension, we report some results within this TAFTC strategy showing what frequency-domain properties are actually satisfied by the closed loop. The TAFTC scheme is based on the trajectories generated by the system, where no a priori information regarding the plant is known at a run-time. We use time-limited measurements of the system instead of acquiring a mathematical model of the plant and we deal. Consequently, the theory of FTS renders a more practical insight to study the stability of the TAFTC scheme than is provided by the classical stability theory.
2013 IEEE International Conference on Control Applications (CCA), 2013
ABSTRACT In this paper, we present a real-time mechanism to accommodate faults occurring in a Win... more ABSTRACT In this paper, we present a real-time mechanism to accommodate faults occurring in a Wind Turbine (WT) system. The demonstrated mechanism lies under the taxonomy of Active Fault-tolerant Control (FTC) systems, namely the online redesign based approach. In the proposed approach, we do not use any a priori information about the model of the turbine in real-time. In fact, we use online measurements generated by the WT. Based on the given control specifications, and the observed measurement an occurred fault is accommodated by redesigning the controller online such that the WT generates rated power even under faulty conditions. Secondly, no explicit fault diagnosis (FD) module is used in this approach. As a result, issues of model uncertainty, false alarms, etc. associated with an integrated FD and controller reconfiguration approach to FTC systems are not experienced here.
Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and... more Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and the given desired behavior. Further, the synthesized controller makes an interconnection with the plant such that the interconnected system satisfies the desired behavior. However, at the time of interconnection it might not be possible. Here, first we design an on-line controller using the real-time measurements generated by the plant, and the given desired behavior. Secondly, we show a way to implement this on-line designed ...
In this note, we discuss about the performance evaluator tool that plays a significant role in th... more In this note, we discuss about the performance evaluator tool that plays a significant role in the data-driven fault tolerant control (FTC) system. In our notion of data-driven approach, we do not have any access to the a priori plant model in real-time. Moreover, we do not equip any estimation algorithm to determine the model of the plant. Here, we use the trajectories generated by the system in real time. These trajectories, in fact, capture the behavior of the system and we directly evaluate the control performance of the closed-loop based on ...
In this note, we present a model-free approach to solve an active fault-tolerant control problem ... more In this note, we present a model-free approach to solve an active fault-tolerant control problem in the behavioral framework. In our control structure, we do not require an explicit fault diagnosis module that identifies the complete fault information. Instead, a new controller is designed based only on the measurements generated by the system in real-time. The interconnection between two dynamical systems plays a significant role within this approach. In our setting, we consider any occurring fault is the cause of undesired ...
ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine... more ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine (WT) system. This system is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's (NREL's) National Wind Turbine Center. The demonstrated mechanism lies under the taxonomy of active fault-tolerant control (AFTC) systems, namely the projection-based approach. In the proposed approach, we do not use any a priori information about the model of the turbine in real-time. In fact, we use the online measurements generated by WT. Based on the given control objectives, and the observed measurements, an occurring fault is accommodated by reconfiguring the controller such that the turbine generates the rated power even under faulty conditions. Second, no use of an explicit fault-diagnosis module is seen in this approach. Therefore, the fault accommodation delay in the proposed AFTC structure is smaller than the delay as experienced in the traditional structure of AFTC systems.
In this note, we present a model-free approach to solve an active fault-tolerant control problem ... more In this note, we present a model-free approach to solve an active fault-tolerant control problem in the behavioral framework. In our control structure, we do not require an explicit fault diagnosis module that identifies the complete fault information. Instead, a new controller is designed based only on the measurements generated by the system in real-time. The interconnection between two dynamical systems plays a significant role within this approach. In our setting, we consider any occurring fault is the cause of undesired ...
In this note, we discuss about the performance evaluator tool that plays a significant role in th... more In this note, we discuss about the performance evaluator tool that plays a significant role in the data-driven fault tolerant control (FTC) system. In our notion of data-driven approach, we do not have any access to the a priori plant model in real-time. Moreover, we do not equip any estimation algorithm to determine the model of the plant. Here, we use the trajectories generated by the system in real time. These trajectories, in fact, capture the behavior of the system and we directly evaluate the control performance of the closed-loop based on ...
Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and... more Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and the given desired behavior. Further, the synthesized controller makes an interconnection with the plant such that the interconnected system satisfies the desired behavior. However, at the time of interconnection it might not be possible. Here, first we design an on-line controller using the real-time measurements generated by the plant, and the given desired behavior. Secondly, we show a way to implement this on-line designed ...
2012 12th International Conference on Control Automation Robotics & Vision (ICARCV), 2012
HAL - hal.archives-ouvertes.fr, CCSd - Centre pour la Communication Scientifique Direct. Accueil;... more HAL - hal.archives-ouvertes.fr, CCSd - Centre pour la Communication Scientifique Direct. Accueil; Dépôt: S'authentifier; S'inscrire. Consultation: Par domaine; Les 30 derniers dépôts; Par année de publication, rédaction, dépôt; Par type de publication; Par collection; Les portails de l'archive ouverte HAL; Par établissement (extraction automatique); ArXiv; Les Thèses (TEL). Recherche: Recherche simple; Recherche avancée; Accès par identifiant; Les Thèses ...
ABSTRACT This paper presents a trajectory-based online control reconfiguration mechanism against ... more ABSTRACT This paper presents a trajectory-based online control reconfiguration mechanism against unknown fault occurring in an electric circuit. First, we demonstrate the modeling of an electric circuit by taking the time-trajectory viewpoint, where no a priori input–output partition has been made. The uniqueness of this viewpoint lies in the fact that it deals only with variables that describe the system without any dedicated (external or internal -type) representation. Subsequently, we illustrate a novel real-time fault-tolerant control (FTC) strategy based on this trajectory standpoint, which does not require an explicit model-based fault diagnosis unit. Instead, the controller is reconfigured directly based on the trajectories generated by the system in real-time, and the given control specifications. In this way, we efficiently excrete the shortcomings that are often seen in model-based fault-tolerant systems. The proposed FTC method is effectively demonstrated on an RLC circuit.
Abstract—In this note, we discuss a performance-based su-pervisor for the fault tolerant control ... more Abstract—In this note, we discuss a performance-based su-pervisor for the fault tolerant control (FTC). We conduct the notion of stability, which is often misinterpreted in our approach with the classical arbitrary switching control. Moreover, we only deal with the trajectories generated by the system in real time and we do not have any access to plant parameters, states of the system etc. Thus, we clearly distinguished this notion employed in both the approaches. A novel switching logic is also proposed that root out the problems ...
ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine... more ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine system such that it can generate the rated power at anytime. This mechanism lies under the taxonomy of Active Fault-Tolerant Control (AFTC) system, namely projection-based approach. In the proposed approach, we do not use any a priori information about the model of the plant in real-time. In fact, we use the online measurements generated by the plant. Based on the given control objectives, and the observed measurements, the controller is re-configured such that the turbine can generate the rated power even under faulty conditions. Secondly, no use of an explicit fault-diagnosis module is seen in this approach. The benchmark model for the Wind Turbine is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's (NREL) National Wind Turbine Center.
2013 Conference on Control and Fault-Tolerant Systems (SysTol), 2013
ABSTRACT The aims of this paper are two folds. First, we aim to gain some insights at the time Tr... more ABSTRACT The aims of this paper are two folds. First, we aim to gain some insights at the time Trajectory-based Active Fault-Tolerant Control (TAFTC) using the frequency spectrum analysis. Secondly, we introduce the concept of finite-time stability (FTS) in the context of AFTC systems. Generally, in TAFTC strategy, the desired specifications are defined in terms of time-domain characteristics under the mathematical framework of behavioral system theory. In this novel fault-tolerant mechanism, we do not work in the traditional input/output setting, i.e. the frequency-domain, at the outset. Instead, we use the system time-trajectories. As an extension, we report some results within this TAFTC strategy showing what frequency-domain properties are actually satisfied by the closed loop. The TAFTC scheme is based on the trajectories generated by the system, where no a priori information regarding the plant is known at a run-time. We use time-limited measurements of the system instead of acquiring a mathematical model of the plant and we deal. Consequently, the theory of FTS renders a more practical insight to study the stability of the TAFTC scheme than is provided by the classical stability theory.
2013 IEEE International Conference on Control Applications (CCA), 2013
ABSTRACT In this paper, we present a real-time mechanism to accommodate faults occurring in a Win... more ABSTRACT In this paper, we present a real-time mechanism to accommodate faults occurring in a Wind Turbine (WT) system. The demonstrated mechanism lies under the taxonomy of Active Fault-tolerant Control (FTC) systems, namely the online redesign based approach. In the proposed approach, we do not use any a priori information about the model of the turbine in real-time. In fact, we use online measurements generated by the WT. Based on the given control specifications, and the observed measurement an occurred fault is accommodated by redesigning the controller online such that the WT generates rated power even under faulty conditions. Secondly, no explicit fault diagnosis (FD) module is used in this approach. As a result, issues of model uncertainty, false alarms, etc. associated with an integrated FD and controller reconfiguration approach to FTC systems are not experienced here.
Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and... more Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and the given desired behavior. Further, the synthesized controller makes an interconnection with the plant such that the interconnected system satisfies the desired behavior. However, at the time of interconnection it might not be possible. Here, first we design an on-line controller using the real-time measurements generated by the plant, and the given desired behavior. Secondly, we show a way to implement this on-line designed ...
In this note, we discuss about the performance evaluator tool that plays a significant role in th... more In this note, we discuss about the performance evaluator tool that plays a significant role in the data-driven fault tolerant control (FTC) system. In our notion of data-driven approach, we do not have any access to the a priori plant model in real-time. Moreover, we do not equip any estimation algorithm to determine the model of the plant. Here, we use the trajectories generated by the system in real time. These trajectories, in fact, capture the behavior of the system and we directly evaluate the control performance of the closed-loop based on ...
In this note, we present a model-free approach to solve an active fault-tolerant control problem ... more In this note, we present a model-free approach to solve an active fault-tolerant control problem in the behavioral framework. In our control structure, we do not require an explicit fault diagnosis module that identifies the complete fault information. Instead, a new controller is designed based only on the measurements generated by the system in real-time. The interconnection between two dynamical systems plays a significant role within this approach. In our setting, we consider any occurring fault is the cause of undesired ...
ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine... more ABSTRACT This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine (WT) system. This system is a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's (NREL's) National Wind Turbine Center. The demonstrated mechanism lies under the taxonomy of active fault-tolerant control (AFTC) systems, namely the projection-based approach. In the proposed approach, we do not use any a priori information about the model of the turbine in real-time. In fact, we use the online measurements generated by WT. Based on the given control objectives, and the observed measurements, an occurring fault is accommodated by reconfiguring the controller such that the turbine generates the rated power even under faulty conditions. Second, no use of an explicit fault-diagnosis module is seen in this approach. Therefore, the fault accommodation delay in the proposed AFTC structure is smaller than the delay as experienced in the traditional structure of AFTC systems.
In this note, we present a model-free approach to solve an active fault-tolerant control problem ... more In this note, we present a model-free approach to solve an active fault-tolerant control problem in the behavioral framework. In our control structure, we do not require an explicit fault diagnosis module that identifies the complete fault information. Instead, a new controller is designed based only on the measurements generated by the system in real-time. The interconnection between two dynamical systems plays a significant role within this approach. In our setting, we consider any occurring fault is the cause of undesired ...
In this note, we discuss about the performance evaluator tool that plays a significant role in th... more In this note, we discuss about the performance evaluator tool that plays a significant role in the data-driven fault tolerant control (FTC) system. In our notion of data-driven approach, we do not have any access to the a priori plant model in real-time. Moreover, we do not equip any estimation algorithm to determine the model of the plant. Here, we use the trajectories generated by the system in real time. These trajectories, in fact, capture the behavior of the system and we directly evaluate the control performance of the closed-loop based on ...
Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and... more Abstract In the behavioral setting, a controller is designed using the behavior of the plant, and the given desired behavior. Further, the synthesized controller makes an interconnection with the plant such that the interconnected system satisfies the desired behavior. However, at the time of interconnection it might not be possible. Here, first we design an on-line controller using the real-time measurements generated by the plant, and the given desired behavior. Secondly, we show a way to implement this on-line designed ...
2012 12th International Conference on Control Automation Robotics & Vision (ICARCV), 2012
HAL - hal.archives-ouvertes.fr, CCSd - Centre pour la Communication Scientifique Direct. Accueil;... more HAL - hal.archives-ouvertes.fr, CCSd - Centre pour la Communication Scientifique Direct. Accueil; Dépôt: S'authentifier; S'inscrire. Consultation: Par domaine; Les 30 derniers dépôts; Par année de publication, rédaction, dépôt; Par type de publication; Par collection; Les portails de l'archive ouverte HAL; Par établissement (extraction automatique); ArXiv; Les Thèses (TEL). Recherche: Recherche simple; Recherche avancée; Accès par identifiant; Les Thèses ...
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