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12th IFAC symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS)

作者： Gia Quoc Bao Tran Pham, Thanh-Phong Sename, Olivier Mines Paris PSL Ctr Automat & Syst Paris France Univ Danang Univ Technol & Educ Fac Elect & Elect Engn Danang Vietnam Univ Grenoble Alpes CNRS Grenoble INP GIPSA Lab F-38000 Grenoble France Univ Grenoble Alpes Inst Engn Grenoble France

This paper proposes a descriptor nonlinear Parameter Varying (NLPV) observer for damper fault estimation in vehicle semi-active suspension systems, here considering the highly practical case of a varying sprung mass, which is an open problem. This mass and the control input are treated as known scheduling parameters for the design and implementation of the observers, thus making the structure adaptive. This novel modeling leads to parameter-dependent dynamics and output matrices in the nonlinear parameter-varying formulation. To solve this problem, we extend an existing reduced-order observer design method (following descriptor system modeling) to this new case. Both polytopic and grid-based methods are then considered to compute and implement the problem solutions. The designs are then assessed using frequency-domain analysis and realistic time-domain simulations. Copyright (c) 2024 The Authors.

关键词： nonlinear Parameter Varying descriptor fault estimation semi-active suspension

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Improved Fractional-Order Sliding Mode controller for Frequency Regulation of a Hybrid Power System With nonlinear Disturbance observer

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2023年第4期59卷 4964-4979页

作者： Guha, Dipayan Roy, Provas Kumar Banerjee, Subrata Motilal Nehru Natl Inst Technol Allahabad Elect Engn Prayagraj 211004 Uttar Pradesh India Kalyani Govt Engn Coll Dept Elect Engn Kalyani 741235 W Bengal India Natl Inst Technol Durgapur Elect Engn Durgapur 713209 W Bengal India

With extensive integration of renewable resources and ever-rising consumer demand, the existing power systems inevitably experience the somber frequency instability problem. This work attempts to design and apply a nonlinear disturbances observer (NDO)-aided improved resilient controller to minimize the frequency deviation of a hybrid power system (hy-PS) following unknown/uncertain system disturbances. The NDO is developed to estimate time-varying uncertain bounded plant disturbance, including parametric uncertainties, load fluctuation, unsteady wind velocity, and unmodelled system dynamics. Subsequently, an active disturbance rejection control is implemented using an improved fractional-order sliding mode controller (iFOSMC) having NDO integrated to cope with system disturbances and offer finite-time asymptotic state convergence to the equilibrium point with least oscillations in control effort. Finite-time convergence of estimation error and asymptotic stability of the developed closed-loop system is also provided by applying the Lyapunov argument to guarantee the reliability of the proposed control algorithm. Besides, the mastery of the proposed NDO-aided iFOSMC compared to other well-known controllers has been demonstrated through comparative study under different perturbed conditions. The obtained system outputs show the high-effective performance of the proposed NDO-aided iFOSMC in terms of faster disturbance compensation, least chattering in control effort, and improved system outputs. The efficacy of the proposed frequency controller has also been tested against false data injection (FDI) attacks in a cyber-physical environment.

关键词： Cyber-physical system fractional-order controller frequency regulation hybrid power system nonlinear disturbance observer resiliency

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Noise Sensitivity Reduction in Low-power Multi High Gain observers Using Low-pass Filters 12

Noise Sensitivity Reduction in Low-power Multi High Gain Obs...

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12th IFAC symposium on nonlinear control Systems (NOLCOS)

作者： Mousavi, S. Guay, M. Queens Univ 99 Univ Ave Kingston ON K7L 3N6 Canada

ISBN: (纸本)9781713872344

Low-power multi high gain observers (LP MHGO) are proven to be effective in reducing the peaking of state estimation of nonlinear systems to an arbitrarily small magnitude. Moreover, they reduce the sensitivity of estimates to measurement noise. They also relax the numerical implementation problem of high gain observers by using gains powered up to the order of 2 instead of n. In this paper, we aim to further reduce the noise sensitivity of these observers by employing low-pass filters in the observer dynamics. The main results establish the convergence of the estimation error to zero with an arbitrarily small decay rate in the absence of noise, as well as an input to state stability feature when the noise is present. We also demonstrate in the linear case that the proposed observer improves the upper bound on the estimates. Simulation results compare the performance of the proposed observer with similar works and show the effectiveness of the proposed method. Copyright (c) 2023 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-ne-nd/4.0/)

关键词： observers for nonlinear systems nonlinear output feedback nonlinear systems

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Adaptive nonlinear control of the Single-Phase Grid-Connected Photovoltaic System 12

Adaptive nonlinear control of the Single-Phase Grid-Connecte...

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12th IFAC symposium on control of Power and Energy Systems (CPES)

作者： Elouafi, M. Mchaouar, Y. Abouelmahjoub, Y. Kandoussi, K. Giri, F. El Beid, S. El Karch, H. Univ Chouaib Doukkali LabSIPE Natl Sch Appl Sci El Jadida 24002 Morocco Univ Caen Basse Normandie LAC LAB EA 7478 Caen France Cadi Ayyad Univ CISIEV Team Marrakech 40160 Morocco

This paper addresses the problem of controlling the single-phase grid connected to the photovoltaic (PV) system through a three-level boost converter (TLBC) and half-bridge inverter (HBI) with LCL-filter. This study aims to achieve four main objectives: (i) ensure that the output voltage of PV panel track a reference given by the MPPT block based on the perturb and observe (P&O) algorithm;(ii) regulate DC bus voltage to ensure injection of photovoltaic power into the grid;(iii) guarantee power factor correction (PFC);(iv) ensure a balance between TLBC output voltages. The problem is dealt with using a nonlinear controller based on the backstepping and lyapunov approaches, a filtered -PI regulator to ensure the power balance between the grid and the PV panel. An adaptive observer is designed in order to estimate the voltage and the impedance parameters of power grid, by measuring only the grid current. The proposed controller and observer performances are confirmed by simulation in MATLAB\Simulink Copyright (c) 2024 The Authors.

关键词： PV system Three-level boost powerfactor correction backstepping control lyapunov technique adaptive observer

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Linear Unknown Input observers for Sensor Fault Estimation in nonlinear Systems 12

Linear Unknown Input Observers for Sensor Fault Estimation i...

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12th IFAC symposium on nonlinear control Systems (NOLCOS)

作者： Venkateswaran, Sunjeev Kravaris, Costas Texas A&M Univ Artie McFerrin Dept Chem Engn College Stn TX 77843 USA

ISBN: (纸本)9781713872344

A systematic methodology for designing of linear unknown input observers (UI0) for fault estimation in nonlinear systems is presented. Necessary and sufficient conditions for the existence of linear UI0s for nonlinear systems are derived and as long as these conditions are satisfied, we obtain explicit design formulas for the observer. The method is applied to a non-isothermal chemical reactor (CSTR) subject to a concentration sensor fault. Copyright (c) 2023 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-ne-nd/4.0/)

关键词： Fault estimation observers fault diagnosis sensor faults chemical reactors.

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Event-Triggered Fault Reconstruction Using Sliding Mode observer 12

Event-Triggered Fault Reconstruction Using Sliding Mode Obse...

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12th IFAC symposium on nonlinear control Systems (NOLCOS)

作者： Mondal, Saikat Behera, Abhisek K. Indian Inst Technol Roorkee Dept Elect Engn Roorkee 247667 Uttar Pradesh India

ISBN: (纸本)9781713872344

In this paper, we study event-triggered fault reconstruction using sliding mode observer (SMO) for a linear time-invariant system. Here, the SMO is designed with an event condition in which output measurements are transmitted over the network. The observer provides the state estimates using the sampled output values in the presence of fault signals. It is shown that with a suitable (switching) gain and the triggering parameter, the observer states converge to the true states (in the practical sense), and thus, the fault signals can be reconstructed with an accuracy dependent on the steady-state error bound. Finally, simulation results are shown to illustrate fault detection employing the proposed approach. Copyright (c) 2023 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-ne-nd/4.0/)

关键词： Event-based feedback fault reconstruction sliding mode observer.

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KKL set-valued observers for non-observable systems 12

KKL set-valued observers for non-observable systems

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12th IFAC symposium on nonlinear control Systems (NOLCOS)

作者： Alleaume, Valentin Bernard, Pauline Univ PSL Ctr Automat & Syst Mines Paris 60 Bd St Michel F-75272 Paris France

ISBN: (纸本)9781713872344

KKL observer design consists in transforming the system dynamics into a filter of the output, which admits a trivial observer, and left-inverting the transformation to recover an estimate of the state in the system coordinates. This left-inversion is typically guaranteed under a backward-distinguishability condition. In this paper, instead, we demonstrate how this KKL approach may also be applied without any such observability assumption. We show that there exist appropriate choices of the filter such that any filter solution asymptotically contains the full information about the state indistinguishable class, namely the set of points generating the same output. Then, we investigate the existence of a set-valued left-inverse allowing to estimate asymptotically this indistinguishable class, in the Hausdorff sense. We prove that the estimate tends to be included asymptotically in the indistinguishable classes of the limit points of the system solution. Finally, we provide a numerical example illustrating this convergence. Copyright (c) 2023 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-ne-nd/4.0/)

关键词： KKL observer design indistinguishability

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Integrated design of Guidance and control for Hypersonic Vehicles Based on Disturbance Compensation 3

Integrated Design of Guidance and Control for Hypersonic Veh...

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3rd International symposium on Aerospace Engineering and Systems, ISAES 2024

作者： Gu, Xiaotong Jiang, Jiahe School of Automation Science and Electrical Engineering Beihang University Beijing China

ISBN: (纸本)9798350350418

This paper focuses on the challenge of designing an effective guidance and control system for the dive phase of hypersonic vehicles. To address this, an integrated approach is proposed, grounded in the principle of disturbance compensation. Firstly, a comprehensive guidance and control model is developed for hypersonic vehicles, which is founded on the motion model of the vehicle itself and the relative motion model describing the interaction between the vehicle and its target. Secondly, to compensate for the uncertainties in the model, a nonlinear disturbance observer is employed. The backstepping dynamic surface method is then utilized to complete the design of the integrated guidance and control system for hypersonic vehicles. Additionally, an appropriate Lyapunov function is selected to conduct a stability analysis of the system. In conclusion, simulations are carried out to validate the efficacy and resilience of the integrated guidance and control method proposed. © 2024 IEEE.

关键词： Hypersonic vehicles

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Observation and Backstepping control of Single-Phase Shunt Active Power Filter Connected to photovoltaic System 12

Observation and Backstepping Control of Single-Phase Shunt A...

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12th IFAC symposium on control of Power and Energy Systems (CPES)

作者： Khentaoui, O. Mchaouar, Y. Abouelmahjoub, Y. Abouobaida, H. Giri, F. Chakiri, S. Univ Chouaib Doukkali Natl Sch Appl Sci LabSIPE El Jadida 24002 Morocco Univ Caen Basse Normandie LAC LAB EA 7478 Caen France

The present paper concentrates on the improvement of power quality using a single-phase active power filter (APF) connected to the photovoltaic (PV) array operating in the presence of a non-linear load. A novel controller design, based on the energy stored in the half-bridge shunt APF is proposed to ensure two main objectives at the same time: (i) the transfer of active power to the electrical network by extracting the maximum of active power from the PV panels and regulating the PV voltage to a reference value provided by the MPPT;(ii) the improvement of power factor correction (PFC) by compensating for the harmonic current and reactive power produced by the non-linear load using the backstepping technique and Lyapunov tools. The nonlinear controller is developed in two loops. An inner loop is constituted of a PFC regulator based on the energy stored in the APF to minimize the total harmonic distortion (THD). An outer loop uses a linear PI regulator to regulate PV array voltage. The controller also comprised an observer to estimate the voltage network, which is not accessible to measurements. The performance of the proposed controller is validated by simulation using MATLAB/Simulink Copyright (c) 2024 The Authors.

关键词： Shunt active powerfilter PV arrays powerfactor correction Network observer nonlinear control Backstepping technique Lyapunov tools

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Runtime Monitoring and Fault Detection for Neural Network-controlled Systems 12

Runtime Monitoring and Fault Detection for Neural Network-Co...

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12th IFAC symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS)

作者： Lan, Jianglin Zhan, Siyuan Patton, Ron Zhao, Xianxian Univ Glasgow James Watt Sch Engn Glasgow G12 8QQ Lanark Scotland Trinity Coll Dublin Dept Mech Mfg & Biomed Engn Dublin 2 Ireland Univ Hull Sch Engn Kingston Upon Hull HU6 7RX N Humberside England Univ Coll Dublin Sch Elect & Elect Engn Dublin DO4 V1W8 Ireland

There is an emerging trend in applying deep learning methods to control complex nonlinear systems. This paper considers enhancing the runtime safety of nonlinear systems controlled by neural networks in the presence of disturbance and measurement noise. A robustly stable interval observer is designed to generate sound and precise lower and upper bounds for the neural network, nonlinear function, and system state. The obtained interval is utilised to monitor the real-time system safety and detect faults in the system's outputs or actuators. An adaptive cruise control vehicular system is simulated to demonstrate effectiveness of the proposed design. Copyright (c) 2024 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/)

关键词： Safety neural network observer fault detection intelligent autonomous vehicles

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