Searched for: author%3A%22Kosmatopoulos%2C+Elias%22
(1 - 15 of 15)
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Grande, Davide (author), Peruffo, A. (author), Salavasidis, Georgios (author), Anderlini, Enrico (author), Fenucci, Davide (author), Phillips, Alexander B. (author), Kosmatopoulos, Elias B. (author), Thomas, Giles (author)
Closed-loop stability of control systems can be undermined by actuator faults. Redundant actuator sets and Fault-Tolerant Control (FTC) strategies can be exploited to enhance system resiliency to loss of actuator efficiency, complete failures or jamming. Passive FTC methods entail designing a fixed-gain control law that can preserve the...
journal article 2024
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Baldi, S. (author), Kosmatopoulos, Elias (author), Roy, Spandan (author), Yuan, Shuai (author), Roy, Sayan Basu (author), Li, Le (author)
contribution to periodical 2022
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Michailidis, Panagiotis (author), Pelitaris, Paschalis (author), Korkas, Christos (author), Michailidis, Iakovos (author), Baldi, S. (author), Kosmatopoulos, Elias (author)
The existing literature on energy saving focuses on large-scale buildings, wherein the energy-saving potential is substantially larger than smaller-scale buildings. However, the research intensity is significantly less for small-scale deployments and their capacities to regulate energy use individually, directly and without depreciating users’...
journal article 2021
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Roy, S. (author), Kosmatopoulos, Elias B. (author), Baldi, S. (author)
In the presence of unmodelled dynamics and uncertainties with no a priori constant bounds, conventional robust adaptation strategies for switched systems cannot allow the control gains of inactive subsystems to remain constant during inactive intervals: vanishing gains are typically required in order to prove bounded stability. As a...
journal article 2020
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Baldi, S. (author), Michailidis, Iakovos (author), Ntampasi, Vasiliki (author), Kosmatopoulos, Elias (author), Papamichail, Ioannis (author), Papageorgiou, Markos (author)
Traffic congestion in urban networks may lead to strong degradation in the utilization of the network infrastructure, which can be mitigated via suitable control strategies. This paper studies and analyzes the performance of an adaptive traffic-responsive strategy that controls the traffic light parameters in an urban network to reduce...
journal article 2019
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Baldi, S. (author), Tao, T. (author), Kosmatopoulos, Elias B. (author)
In this study, the authors study adaptive synchronisation in networks with Kuramoto units whose parameters are unknown and where measurements are quantised over the communication network (therefore information is limited). They show that, for an undirected connected graph, synchronisation is enabled via appropriate adaptive protocols that...
journal article 2019
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Baldi, S. (author), Papachristodoulou, Antonis (author), Kosmatopoulos, Elias B. (author)
In this work we propose a novel adaptive switching strategy for the design of pulse width modulation signals in power converters. Instead of an uncertain averaged model of the power converter, an uncertain switched model is considered, which can better represent the actual power converter dynamics. Uncertainties in the power converters...
journal article 2018
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Azzollini, Ilario A. (author), Baldi, S. (author), Kosmatopoulos, Elias B. (author)
We analyze adaptive synchronization capabilities in networks with Kuramoto-like units whose dynamical features are unknown and thus synchronization protocols must exhibit co-evolution capabilities. In the presence of heterogeneous and uncertain units, synchronization should be enabled by appropriate adaptive protocols that counteract the...
conference paper 2018
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Baldi, S. (author), Azzollini, Ilario A. (author), Kosmatopoulos, Elias B. (author)
In networks with heterogeneous and uncertain agents, fixed-gain control can lead to synchronization only if the uncertainties are relatively small. If the uncertainties are larger, we need to develop adaptive-gain approaches to achieve synchronization. In this work we propose an adaptive synchronization protocol, in case of full-state...
conference paper 2018
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Baldi, S. (author), Korkas, Christos D. (author), Lv, Maolong (author), Kosmatopoulos, Elias B. (author)
Load management actions in large buildings are pre-programmed by field engineers/users in the form of if-then-else rules for the set point of the thermostat. This fixed set of actions prevents smart zoning, i.e. to dynamically regulate the set points in every room at different levels according to geometry, orientation and interaction among...
journal article 2018
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Baldi, S. (author), Rosa, Muhammad Ridho (author), Frasca, Paolo (author), Kosmatopoulos, Elias B. (author)
Recently, adaptive platooning strategies to cope with uncertain vehicle parameters have been proposed. However, in line with most platooning literature, only acyclic graphs have been considered. This work addresses the merging maneuver in the presence uncertain vehicle parameters: during this maneuver, a cyclic communication graph is...
journal article 2018
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Michailidis, Lakovos (author), Baldi, S. (author), Kosmatopoulos, Elias B. (author), Ioannou, Petros A. (author)
In this paper, we present an adaptive optimal control approach applicable to a wide class of large-scale nonlinear systems. The proposed approach avoids the so-called loss-of-stabilizability problem and the problem of poor transient performance that are typically associated with adaptive control designs. Moreover, it does not require the system...
journal article 2017
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Korkas, Christos D. (author), Baldi, S. (author), Michailidis, Iakovos (author), Boutalis, Yiannis (author), Kosmatopoulos, Elias B. (author)
Microgrids equipped with small-scale renewable-energy generation systems and energy storage units offer challenging opportunity from a control point of view. In fact, in order to improve resilience and enable islanded mode, micro-grid energy management systems must dynamically manage controllable loads by considering not only matching energy...
conference paper 2016
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Baldi, S. (author), Kosmatopoulos, Elias B. (author), Pitsillides, Andreas (author), Lestas, Marios (author), Ioannou, Petros A. (author), Wan, Y. (author)
An adaptive decentralized strategy for active queue management of TCP flows over communication networks is presented. The proposed strategy solves locally, at each link, an optimal control problem, minimizing a cost composed of residual capacity and buffer queue size. The solution of the optimal control problem exploits an adaptive...
conference paper 2016
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Baldi, S. (author), Valmorbida, Giorgio (author), Papachristodoulou, Antonis (author), Kosmatopoulos, Elias B. (author)
This work proposes an online policy iteration procedure for the synthesis of sub-optimal control laws for uncertain Linear Time Invariant (LTI) Asymptotically Null-Controllable with Bounded Inputs (ANCBI) systems. The proposed policy iteration method relies on: a policy evaluation step with a piecewise quadratic Lyapunov function in both the...
conference paper 2016
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