Structural Properties of Networked Control Systems With Bandwidth Limitations and Delays

Pasand, Mohammad Mahdi Share; Montazeri, Mohsen

doi:10.1002/asjc.1447

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…Consider a discrete-time uncertain networked distributed wide-area system described as (8). The optimal control problem is then to find inputs u(0),⋯,u(N − 1) by minimizing the following quadratic performance index:…”

Section: The First Levelmentioning

confidence: 99%

“…The decomposition of the networked distributed wide-area system (8) into m subsystems is represented as follows:…”

Section: The First Levelmentioning

confidence: 99%

“…Recently, the advancements of WAMS in parallel with networked communication technologies have made the prospect of damping oscillation and enhancing the performance of geographically distributed power systems through remote signals a realistic one [6,7]. However, employing remote signals through the communication channels brings unavoidably serious difficulties, such as inevitable time-varying delays and data packet loss, into the design of networked control systems which will inevitably deteriorate the control performance or may even cause entire system instability [8,9].…”

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confidence: 99%

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A networked hierarchical control scheme for wide‐area systems: A power system application

Khayyer

Farsangi

Bijami

2019

Asian Journal of Control

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This paper presents a new networked hierarchical predictive sliding mode controller for the design of stabilizing signals to damp low frequency oscillations observed in geographically distributed networked power systems subject to communication network constraints. Firstly, through the generic framework of networked systems, a networked model is used for a distributed networked system in which network delays and data packet loss are considered in a wide area measurement system (WAMS). Then a hierarchical predictive sliding mode controller with robust reaching law is proposed to compensate the influence of WAMS communication latency and damp the inter-area oscillations. For this, firstly, the overall system is decomposed into small subsystems with non-sparse matrices and lower order; then a new suitable predictive sliding mode controller is designed to provide optimal performance. Furthermore, in order to coordinate the entire system, the gradient of interaction errors is used. The effectiveness of the proposed control framework is illustrated through numerical simulations on a 5-area, 16-machine power system with several interconnected areas. Simulation results show the capability of the proposed approach to enhance the networked power systems' damping in comparison with a conventional networked control method. KEYWORDS hierarchical control, networked control, power system stability, predictive sliding mode, wide area system 1 | INTRODUCTION Distributed wide-area systems commonly appear in the real world, in the form of, for example, power grids, chemical plants, water distribution networks, traffic systems, etc. Systems are wide-area systems if they can be decoupled or decomposed into a number of interconnected/interacting subsystems or if their dimensions are so large that using the usual analysis, optimization, and control methods cannot achieve an acceptable answer during reasonable computational time and efforts [1]. Such typical motivating problems arise in the control of widely distributed multi-area power systems with severe interactions. These problems are mainly due to large dimensions, modeling errors, disturbances, and uncertainties in such systems. The stability of modern power grids is one of the most important issues in the operation of these systems. The increasing size of wide-area electric power grids and the interconnection of these systems via weak tie

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Section: The First Levelmentioning

confidence: 99%

“…The decomposition of the networked distributed wide-area system (8) into m subsystems is represented as follows:…”

Section: The First Levelmentioning

confidence: 99%

mentioning

confidence: 99%

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A networked hierarchical control scheme for wide‐area systems: A power system application

Khayyer

Farsangi

Bijami

2019

Asian Journal of Control

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“…NCSs are spatially distributed systems in which the communication among sensors, actuators, and controllers occurs through a shared band-limited digital communication network [1,2]. Due to the opening-up property of shared networks, especially for the wireless networks, the measurement signals or control commands may be corrupted by adversaries [3,4], time delay [5][6][7], packet losses [8][9][10], and so on. Those undesired behaviors may destroy the stability of systems.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of uncertain networked control systems with actuator saturation and probabilistic cyberattacks

Huang

Xing

et al. 2022

Asian Journal of Control

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This paper investigates the stabilization of uncertain networked control systems (NCSs) with actuator saturation and cyberattacks. The cyberattacks are governed by a set of independent random variables satisfying Bernoulli distribution. To relieve the network bandwidth load effectively, an event‐triggered communication strategy is proposed. By employing Lyapunov stability theory and stochastic analysis techniques, a stability criterion is obtained for the system with actuator saturation and cyberattacks. Moreover, the desired controller gain is derived by solving some matrix inequalities. Finally, the validity and applicability of the criteria are verified through numerical examples.

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“…It is well known that in the network and wireless network transmission, many problems affect the quality of the remote control and inevitably increase the complexity of the control system. [2][3][4] The main communication problems are delays introduced by the network into the control-loop system and possible packet abandonment in the feedback and transmission channels. [5][6][7] In this context, various efforts have been focused on networked predictive control (NPC) coping with the networked control system (NCS) to solve these problems.…”

Section: Introductionmentioning

confidence: 99%

Embedded predictive control strategy based on Internet of Things technology: Application to a thermal process under imperfect wireless network

Kouki

Salhi

Bouani

2019

Proceedings of the Institution of Mechanical Engineers, Part I:

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This article is concerned with the design of wireless-networked control framework based on Internet of Things technology and predictive control strategy to remote control a thermal benchmark system. In order to improve the control performance of systems, an autonomous real-time solution is proposed for handling network problems. The adopted control strategy is divided into two cooperative parts under a master–slave architecture, in which two STM32 microcontrollers are investigated. The slave board is connected closely to the process and the master one is a distant controller. The microcontrollers communicate wirelessly through the Transmission Control Protocol/Internet Protocol. In the master board, a model predictive output-estimator-based controller is designed to control wirelessly the benchmark system, even though the incoming outputs from the slave board are lost. However, a buffered structure is implemented on the slave board to compensate the input losses of the arrived control sequences. The performance of the proposed wireless-networked predictive control compensation strategy for packet loss and perturbation handling in the wireless-networked control system in this work is verified through different experimentation conditions. Also, a comparative study with a wireless-networked proportional integral controller is performed to demonstrate the effectiveness of wireless-networked predictive control strategy for practical Internet of Things applications.

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Structural Properties of Networked Control Systems With Bandwidth Limitations and Delays

Cited by 12 publications

References 25 publications

A networked hierarchical control scheme for wide‐area systems: A power system application

A networked hierarchical control scheme for wide‐area systems: A power system application

Stabilization of uncertain networked control systems with actuator saturation and probabilistic cyberattacks

Embedded predictive control strategy based on Internet of Things technology: Application to a thermal process under imperfect wireless network

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