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Open AccessArticle

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
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Author to whom correspondence should be addressed.
Academic Editor: Trung Dung Ngo
Electronics 2015, 4(4), 857-878; https://doi.org/10.3390/electronics4040857
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)
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
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Short, M.; Abugchem, F.; Abrar, U. Dependable Control for Wireless Distributed Control Systems. Electronics 2015, 4, 857-878.

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