Добірка наукової літератури з теми "Commandes décentralisées ou distribuées"
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Статті в журналах з теми "Commandes décentralisées ou distribuées":
Heyer, Éric. "Comment expliquer l’évolution de l’emploi salarié depuis la crise Covid ?" Revue de l'OFCE N° 180, no. 1 (March 6, 2024): 179–206. http://dx.doi.org/10.3917/reof.180.0179.
Дисертації з теми "Commandes décentralisées ou distribuées":
Veetaseveera, Jomphop. "Decentralized control design for synchronization of multi-agent systems with guaranteed individual costs." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0303.
The work of this thesis focuses on the synthesis and analysis of synchronization algorithms for multi-agent systems, with linear dynamics and fixed topology. By synchronization, we mean that the states of all agents evolve on the same trajectory from a certain time. Taking into account communication constraints, we propose decentralized control architectures, i.e. that use only local information. In a first part, we draw from game theory to propose a control law considering an individual satisfactory cost per agent. In order to facilitate the analysis, the synchronization problem is first reformulated as a stabilization problem. Then, conditions given in the form of Linear Matrix Inegalities allow to check if a gain profile corresponds to a satisfaction equilibrium or not. A set of gains is a satisfaction equilibrium when the individual cost of each agent is bounded by a given threshold. Furthermore, based on the output feedback control, a second result allows us to synthesize the gain of an agent assuming the gains of the other agents are known. The second part, dedicated to networks with clusters, is based on the Singular Perturbed Theory to present a control law more focused on large-scale networks. The objective is to provide a computationally efficient method to design control strategies that guarantee a certain limit on the cost of each cluster. Using a time-scale separation method, the control law design is separated into two parts: an internal and an external control. Their designs are done independently from each other and tend to reduce the computational load. Moreover, we show that the internal control affects the cost of the cluster only during a short period of time
Hervagault, Yoann. "Conception et réalisation d'un système efficace de communication et de coordination au sein d'une flotille de drones aquatiques de surface." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT048.
Les travaux présentés dans cette thèse visent à améliorer les performances du système SPYBOAT, une gamme de drones aquatiques de surface développés par l'entreprise CT2MC et destinés à la réalisation de missions de surveillance environementale en eau douce. Afin de pouvoir mener à bien leurs missions, le maintien de la communication radio avec ces équipements est primordial à la fois pour pouvoir envoyer de nouvelles instructions aux agents, et pour évaluer l'état d'avancement de la mission. Les objectifs de cette thèse sont donc complémentaires:- concevoir une antenne dédiée à un véhicule autonome de surface et contenue dans sa coque,- développer une stratégie de déploiement qui prend en compte la portée radio et les ressources de calcul limitées.Dans un premier temps, les paramètres dynamiques d'un des modèles SPYBOAT ont été identifiés au cours d'une campagne de mesures réalisée sur le Lac du Bourget (73). Le modèle dynamique est ensuite approfondi afin de mettre en évidence sa platitude qui sera utilisée lors de la génération des trajectoires de référence.Ensuite, les conditions particulières d'un point de vue radio-fréquence sont abordées telles que la proximité de l'eau, les faibles hauteurs et le voisinage d'éléments conducteurs. La topologie choisie consiste en un réseau d'antennes constitué de 3 monopoles semi-circulaires. Les performances de cette antenne ont été évaluées par simulation et confirmées par le biais de mesures effectuées sur des prototypes. Les résultats montrent que ces antennes offrent des performances comparables aux dipoles filaires classiquement utilisés dans ce domaine.Enfin, nous proposons un algorithme de génération d'une trajectoire de référence pour une flotte de drones exploitant la platitude des systèmes à contrôler. Les contraintes de portée induites par l'utilisation de l'antenne sont prises en compte afin de garantir le contact radio avec chaque agent. Cette étape d'optimisation est réalisée en amont de la mission afin de minimiser la tâche alouée au contrôleur, qui consiste en une commande LQR (Linear Quadratic Regulator) à gain variable. Cette stratégie de commande a été simulée et testée avec succès sur un système réel
Van, Assche Vincent. "Etude et mise en oeuvre de commandes distribuées." Nantes, 2002. http://www.theses.fr/2002NANT2015.
In this work, we consider linear systems defined over a ring (such systems can be used for the modelisation of time-delay systems). We put ourselves in the context where distributed delays can be used in the control law. Then we take an interest in the feedback realization of precompensators (with dynamic, static, or distributed feedbacks). We provide several original solutions to this problem, when the models are defined over the ring of polynomials in several variables or over the ring [epsilon]
Sghairi, Haouati Manel. "Architectures innovantes de systèmes de commandes de vol." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2010. http://tel.archives-ouvertes.fr/tel-00509156.
Matignon, Laëtitia. "Synthèse d'agents adaptatifs et coopératifs par apprentissage par renforcement.Application à la commande d'un système distribué de micromanipulation." Phd thesis, Université de Franche-Comté, 2008. http://tel.archives-ouvertes.fr/tel-00362529.
Korniienko, Anton. "Réseau de PLLs distribuées pour synthèse automatique d'horloge de MPSOCs synchrones." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00676933.
Xiao, Zijian. "Contrôle modulaire décentralisé - Application aux convertisseurs multi-phasés isolés entrelacés et magnétiquement couplés." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10717/1/xiao.pdf.
Wei, Jin. "Modeling and Coordination of interconnected microgrids using distributed artificial intelligence approaches." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCA021.
As renewable sources penetrate the current electrical system to relief global warming and energy shortage, microgrid (MG) emerges to reduce the impact of intermittent generation on the utility grid. Additionally, it improves the automation and intelligence of the power grid with plug-and-play characteristics. Inserting more MGs into a distribution network promotes the development of the smart grid. Thus MG networks existing in the power system are in prospect. Coordinating them could gain a system with high reliability, low cost, and strong resistance to electrical faults. Achieving these profits relies on developed technologies of communication, control strategy, and corresponding algorithms.Dispatching power in distributed MGs while coordinating elements within the individual MG demands a decentralized control system, in which the multi-agent system possesses advantages. It is applied to the MG network for establishing a physically distributed system. Based on the multi-agent system, this thesis mainly studies the coordination control in the MG network and its modeling. It aims at promoting control performance in terms of efficiency, reliability, economic benefit, and scalability. Two methods are considered to enable the system scalability, including the coordination with neighboring MGs and within the extensive coordinating area. A simulation platform is established to validate the proposed approaches.The control strategies for coordination between MGs and their neighbors are proposed to maintain the complete load supply and global security operation while minimizing the generation cost. Centralized control in the coordination group is applied for economic energy management. It uses a Newton-Raphson method to dispatch power among neighboring MGs by simplifying the relationship between MG generation cost and its output power. An average consensus approach is adopted to calculate the caused network power flow, and the results are compared with the maximal capacity on the line to keep safe operation. To further improve the economic benefits, the approximation of the relationship between MG output power and the caused generation cost is improved by an another strategy based on the market concept. It builds a market for neighboring power trade. This method maintains the operation privacy of individual MG. Power flow calculation is simplified to be proportional to the angle difference between the two terminates of the connecting line. Both strategies are tested on several MG network. Their performance shows that both approaches possess scalability and could economically compensate for the lack of load supply in faulted MG.For the control strategy with higher reliability and profit, a coordination strategy within a selected extensive area of MGs is proposed. Expanding the coordination area based on neighboring MGs provides more energy sources to the demanded MG. It ensures enough power to compensate imbalance and offers more choices for power dispatching. The selection of the coordination area is based on a distributed evolutionary algorithm. Quadratic programming in Gurobi is used to solve the power dispatching problem. Another genetic algorithm is also adopted to solve the problem of optimal power dispatching with a quadratic generation cost for microturbine. The performance of this strategy is tested, and the results show that it has comprehensive advantages on reliability, scalability, and profit compared with centralized methods
Dkhili, Nouha. "A model-based predictive control strategy for low-voltage power distribution grids with prolific distributed generation in Occitania." Thesis, Perpignan, 2020. https://theses-public.univ-perp.fr/2020PERP0037.pdf.
The term ''smart grid'' refers to a modern power grid that successfully integrates prolific distributed generation with end loads and efficiently reroutes power flows to balance supply and demand in real time with respect to stability, quality, and safety constraints. It relies on improved observability and advanced control techniques, and offers the possibility of advanced demand side management.In the context of the Smart Occitania project, which aims to study the feasibility of the smart grid concept for rural and suburban power distribution grids, this work proposes a model-based predictive control strategy based on flexible asset management (herein a biogas plant and a water tower) that aims to balance power supply and demand within the power grid while maintaining voltage levels within prescribed margins. The control scheme incorporates intraday forecasts of various stochastic quantities that impact the system, procured through Gaussian process regression.The main contribution of this thesis is twofold: the predictive controller's optimisation problem is formulated in such a way that the ON/OFF of the water tower is handled without recourse to mixed-integer nonlinear programming or relaxation, and the confidence intervals provided by the forecast module are utilised to minimize voltage overshooting due to forecasting errors.The results illustrate the promise of a predictive controller relying on renewable-energy-based flexible assets to reduce the gap between power supply and demand, while upholding the power grid's voltage constraints
Perez, zuniga Carlos gustavo. "Analyse Structurelle pour le Diagnostic des Systèmes Distribués." Thesis, Toulouse, INSA, 2017. http://www.theses.fr/2017ISAT0024/document.
The recent development of technological systems implies a high complexity of behaviors for today’s systems. An answer to the increased system’s complexity is to look at them as a multitude of heterogeneous subsystems and develop distributed techniques to control and manage them. This raises a number of problems. Firstly, as the size and number of components increase, so does the number of fault occurrences that may drive the system to undergo critical failures. Fault detection and isolation (FDI), maintenance and repair are an increasing part of the operational everyday’s tasks and they impact drastically the total cost of final products.This thesis focuses on fault detection and isolation. Among the different methods to generate diagnosis tests by taking advantage of analytical redundancy, this thesis adopts the so-called parity space approach based on analytical redundancy relations (ARRs). Given a model of the system in the form of a set of differential equations, ARRs are relations that are obtained from the model by eliminating non measured variables. This can be performed in an analytical framework using elimination theory but another way of doing this is to use structural analysis. Structural analysis is based on a structural abstraction of the model that only retains a representation of which variables are involved in which equations. Despite the rusticity of the abstract model, structural analysis provides a set of powerful tools, relying on graph theory, to analyze and infer information about the system. Interestingly, it applies indifferently to linear or nonlinear systems. The goal of this thesis is to develop effective techniques based on structural analysis for diagnosis of distributed continuous systems. In this framework, the system is decomposed into a set of subsystems according to functional, geographical or privacy constraints. The thesis is organized in two parts:• highlighting the redundancies that are built into the global structural model and that can be used to generate diagnosis tests starting from the redundancies existing in the subsystem’s models,• formulating and solving the optimization problem linked to the choice of a subset of diagnosis tests at the subsystems level that can lead to a set of diagnosis tests achieving maximum diagnosability for the global system.The first part takes benefit of the concept of Fault-Driven Minimal Structurally Overdetermined Set (FMSO set) that is introduced in the thesis. An FMSO set determines a subset of equations of the model with minimal redundancy from which an ARR sensitive to a set of faults can be obtained. Two solutions for generating FMSOs for the global system are presented, in a decentralized framework with supervisors at each level of a hierarchy and in a totally distributed framework.These are based on the properties of the FMSO sets for the subsystems in relation to those of the global system derived in the thesis