Papers by Joseph-Julien Yamé
Annual Reviews in Control, 2007
Networked Control Systems (NCSs) deal with feedback control systems with loops closed via data co... more Networked Control Systems (NCSs) deal with feedback control systems with loops closed via data communication networks. Control over a network has many advantages compared with traditionally controlled systems, such as a lower implementation cost, reduced wiring, simpler installation and maintenance and higher reliability. Nevertheless, the networkinduced delay, packet dropout, asynchronous behavior and other specificities of networks will degrade the performance of closed-loop systems. In this context, it is necessary to develop a new theory for systems that operate in a distributed and asynchronous environment. Research on Fault Detection and Isolation (FDI) for NCSs has received increasing attention in recent years. This paper reviews the state of the art in this topic.
2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601), 2004
This paper presents a new approach to fault-tolerant control (FTC) based on control performance m... more This paper presents a new approach to fault-tolerant control (FTC) based on control performance monitoring and real-time plant data without explicit fault detection and isolation algorithms. The approach sets forth the theory of unfalsified control to achieve a real-time reconfiguration of control laws which are consistent with the performance objectives for a class of system faults. The obtained FTC scheme
2010 11th International Conference on Control Automation Robotics & Vision, 2010
This paper presents a self-conditioned implementation of any two-degree-of-freedom (TDOF) control... more This paper presents a self-conditioned implementation of any two-degree-of-freedom (TDOF) controller which allows a conditioned transfer when switching between a controller acting in closed-loop and another controller in a bank of idle controllers waiting to take over the control loop. Here, the notion of conditioned transfer is used to mean that after switching, good tracking performance is ensured albeit a
Le Centre pour la Communication Scientifique Directe - HAL - memSIC, May 21, 2013
2019 IEEE 58th Conference on Decision and Control (CDC)
In this paper, we propose a novel bilinear observer-based fault diagnosis algorithm, which detect... more In this paper, we propose a novel bilinear observer-based fault diagnosis algorithm, which detects, isolates, and extracts precise information about the damper stuck fault in VAV based HVAC systems in order to improve occupants comfort, and reduce the operation, maintenance, and utility costs, thus reducing the environmental impact. The effectiveness of the proposed method is successfully demonstrated on a case study of a one-storey building comprising of three zones, constructed using SIMBAD (SIMulator of Building And Devices).
2019 4th Conference on Control and Fault Tolerant Systems (SysTol)
This paper presents a novel integrated decentralized fault-diagnosis and fault-tolerant approach ... more This paper presents a novel integrated decentralized fault-diagnosis and fault-tolerant approach based on the decentralized economic model predictive control strategy for an HVAC system in a multi-zone building. The Interconnected zones of the building are coupled primarily due to the walls they share, whose direct temperature measurement is either difficult to obtain or is not available. To overcome this problem and estimate the wall temperatures of zones, a full order nonlinear state-observer is designed. Further, using these estimates, we decompose the system into control-oriented thermal models of individual zones. Subsequently, an integrated decentralized fault-diagnosis and fault-tolerant approach based on the decentralized economic model-predictive control is designed which can be easily scaled to buildings with a large number of zones, thereby, making it suitable for real-time implementation. A one-storey building with three zones is used for demonstrating the efficacy of control and monitoring approach.
2018 IEEE Conference on Decision and Control (CDC), 2018
In this paper, we present a novel active fault-adaptive control (FAC) methodology for wind turbin... more In this paper, we present a novel active fault-adaptive control (FAC) methodology for wind turbines, which minimizes the economic cost of turbines by achieving two broad objectives: power maximization and fatigue reduction possibly under the effect of bias faults in converters. The proposed FAC system is composed of two modules: a fault diagnosis subsystem and controller redesign subsystem. The latter module is synthesized using a model-predictive control (MPC) scheme in which the constraints set of the decision variables is not naturally convex. A major contribution of the paper is the reformulation of the non-convex optimization problem into a convex problem through some new decision variables. The fault diagnosis algorithm is built upon an unknown-input-residual generator and a specifically designed filter which extracts the complete information of the fault. This fault information is subsequently used to update in real-time the constraints of the MPC thereby ensuring automatic adaptation of the control law to the new operating mode. The effectiveness of the developed scheme is demonstrated on a $2MW$ wind turbine system.
The aims of this paper are two folds. First, we aim to gain some insights at the time Trajectory-... more 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. Since 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, the theory of FTS renders a more practical insight than is pro...
2019 Sixth Indian Control Conference (ICC), 2019
This paper presents a novel integrated pseudo-decentralized fault-diagnosis and fault-tolerant ap... more This paper presents a novel integrated pseudo-decentralized fault-diagnosis and fault-tolerant approach based on the pseudo-decentralized economic model predictive control (pDeMPC) strategy for an HVAC system in a multi-zone building. Feedback linearization is employed to cancel out the bilinear and Hammerstein terms, thereby, resulting in an easily handleable linear system. A full order state-observer is designed to estimate the unmeasured wall temperatures of the zone because shared walls are the primary source of coupling between the interconnected zones. With this complete state information, the system is decomposed into control-oriented thermal models of individual zones. Subsequently, an integrated pseudo-decentralized fault-diagnosis and fault-tolerant approach based on pDeMPC scheme which utilizes the interaction among the zones is designed which can be easily scaled to buildings with a large number of zones, thereby, making it suitable for real-time implementation. SIMulati...
2021 American Control Conference (ACC), 2021
In this paper, we propose a novel robust adaptive fault estimation algorithm for damper faults in... more In this paper, we propose a novel robust adaptive fault estimation algorithm for damper faults in variable-air-volume (VAV) boxes of the Heating Ventilation and Air-conditioning (HVAC) systems. The algorithm is based on bilinear observer to robustly detect and isolate faults followed by obtaining the precise estimate of the lock-in-place faults by robust adaptation of the fault estimates. The proposed adaptive fault estimator is robust in the sense that the fault estimates are not affected by the unmeasured disturbance variable in the presence of measurement noises.
2016 14th International Conference on Control, Automation, Robotics and Vision (ICARCV), 2016
Variable air volume (VAV) air-conditioning system is considered an energy-efficient solution for ... more Variable air volume (VAV) air-conditioning system is considered an energy-efficient solution for multi-zones building, which can meet the stringent cooling and heating demands of occupants within individual zones. The role within this system is to feed zones with varying flow of constant temperature air independently supplied by an air-handling unit. A fault appearing in the VAV damper deteriorates severely the control performance and consequently, would not only affect the energy efficiency of the overall system but also lead to occupant discomfort. To circumvent this issue, we present a novel data-driven fault-tolerant control (FTC) scheme in this paper for a VAV thermal system within a multi-zone building. The novelty of the proposed strategy is that neither the thermal dynamical model is used in real-time, nor online identification of this model is required. The design of the FTC scheme is solely based on the online data generated by the process. The effectiveness of the developed scheme is demonstrated on a case-study of two-zones in a multi-storey building.
2014 13th International Conference on Control Automation Robotics & Vision (ICARCV), 2014
In this paper, we formulate the fault-tolerant control (FTC) problem in the behavioral system the... more In this paper, we formulate the fault-tolerant control (FTC) problem in the behavioral system theoretic framework. To solve this problem, two methodologies are presented, which rest under the broad classification of FTC systems, namely projection-based approach and online redesign approach. The novelty within these approaches lies in the fact that any a priori information about the plant is not available in real-time. In addition, no online identification or estimation of the running plant is carried out. Rather, the real-time fault accommodation is solely based on the online measurements generated by the unknown plant.
2014 13th International Conference on Control Automation Robotics & Vision (ICARCV), 2014
The aims of this paper are two-folds. Firstly, we present a model-free algorithm for synthesizing... more The aims of this paper are two-folds. Firstly, we present a model-free algorithm for synthesizing an online controller. Secondly, this algorithm also addresses the issue of switching this controller in closed-loop with a bumpless mechanism. The novelty of this algorithm lies in the fact that we do not use any a priori knowledge of the model of the plant in realtime. We use the mathematical framework of behavioral system theory to demonstrate the online controller synthesis and its implementation mechanism.
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 the behavioral setting, a controller is designed using the behavior of the plant, and the give... more 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 realtime measurements generated by the plant, and the given desired behavior. Secondly, we show a way to implement this on-line designed controller such that at the time of interconnection, the closed-loop satisfies the desired behavior. The novelty of the demonstrated approach lies in the fact that we do not have any a priori information about the plant in real-time.
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 PES Innovative Smart Grid Technologies Conference (ISGT), 2013
This paper presents a real-time mechanism to tolerate faults occurring in a Wind Turbine (WT) sys... more 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. The demonstrated mechanism lies under the taxonomy of Active Fault-Tolerant Control (AFTC) systems, namely 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 measurements an occurring fault is accommodated by reconfiguring the controller such that the WT generates the rated power even under faulty conditions. Secondly, no use of an explicit fault-diagnosis module is seen in this approach. Therefore, the fault accommodation delay in the proposed AFTC system is smaller than the delay as experienced in the traditional structure of AFTC systems.
2014 UKACC International Conference on Control (CONTROL), 2014
This paper presents a trajectory-based online controller reconfiguration mechanism to tolerate fa... more This paper presents a trajectory-based online controller reconfiguration mechanism to tolerate faults in a wind turbine (WT) system. The system is a benchmark WT model which includes FAST coded simulator designed by the U.S. National Renewable Energy Laboratory's. The novelty of the proposed mechanism is that no a priori information about the model of the turbine is used in real-time. Instead, we use online measurements generated by the WT, which in fact captures the behaviour of the wind turbine. Based on the given control specifications, and the observed measurements an occurring fault is accommodated by reconfiguring the controller such that the WT generates the rated power even under faulty conditions.
18th Mediterranean Conference on Control and Automation, MED'10, 2010
In this paper, a novel concept of model based fault tolerance control (FTC) is presented. The FTC... more In this paper, a novel concept of model based fault tolerance control (FTC) is presented. The FTC is achieved by 2-DOF control strategy: feedback control and feed forward control. Robustness issues are handled by the optimal feedback control and the time varying fault behavior by feed forward path. Firstly, a fault diagnosis scheme is presented for detecting and estimating the fault behavior from the observer based residual generator. The estimated behavior of the fault is used by the feed-forward control algorithm to make appropriate changes in the manipulated variable which keeps the controlled variable near to its set value. The effectiveness of the proposed scheme is analyzed using behavioral theoretic approach.
2012 12th International Conference on Control Automation Robotics & Vision (ICARCV), 2012
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Papers by Joseph-Julien Yamé