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Electronics 2015, 4(4), 857-878; doi:10.3390/electronics4040857

Dependable Control for Wireless Distributed Control Systems

1
Electronics & Control Group, Teesside University, Middlesbrough, TS1 3BA, UK
2
Department of Electrical Engineering, University of Faisalabad, NFC-IEFR Faisalabad, Pakistan
*
Author to whom correspondence should be addressed.
Academic Editor: Trung Dung Ngo
Received: 27 June 2015 / Revised: 21 October 2015 / Accepted: 24 October 2015 / Published: 2 November 2015
(This article belongs to the Special Issue Wireless Sensor and Actuator Networks)
View Full-Text   |   Download PDF [702 KB, uploaded 2 November 2015]   |  

Abstract

The use of wireless communications for real-time control applications poses several problems related to the comparatively low reliability of the communication channels. This paper is concerned with adaptive and predictive application-level strategies for ameliorating the effects of packet losses and burst errors in industrial sampled-data Distributed Control Systems (DCSs), which are implemented via one or more wireless and/or wired links, possibly spanning multiple hops. The paper describes an adaptive compensator that reconstructs the best estimates (in a least squares sense) of a sequence of one or more missing sensor node data packets in the controller node. At each sample time, the controller node calculates the current control, and a prediction of future controls to apply over a short time horizon; these controls are forwarded to the actuator node every sample time step. A simple design method for a digital Proportional Integral Derivative (PID)-like adaptive controller is also described for use in the controller node. Together these mechanisms give robustness to packet losses around the control loop; in addition, the majority of the computational overhead resides in the controller node. An implementation of the proposed techniques is applied to a case study using a Hardware in the Loop (HIL) test facility, and favorable results (in terms of both performance and computational overheads) are found when compared to an existing robust control method for a DCS experiencing artificially induced burst errors. View Full-Text
Keywords: real-time sensor actuator networks; distributed wireless control systems real-time sensor actuator networks; distributed wireless control systems
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Short, M.; Abugchem, F.; Abrar, U. Dependable Control for Wireless Distributed Control Systems. Electronics 2015, 4, 857-878.

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