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Stability analysis and model-based control in EXTRAP-T2R with time-delay compensation
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
CNRS/Supelec Laboratoire des Signaux et Systemes, Gif-sur-Yvette, France.
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2008 (English)In: Proceedings of the 47th IEEE Conference on Decision and Control, Cancun, Mexico, Dec. 9-11, 2008, IEEE conference proceedings, 2008, 2044-2049 p.Conference paper (Refereed)
Abstract [en]

In this paper, we investigate the stability problems and control issues that occur in a reversed-field pinch (RFP) device, EXTRAP-T2R (T2R), used for research in fusion plasma physics and general plasma (ionized gas) dynamics. The plant exhibits, among other things, magnetohydrodynamic instabilities known as resistive-wall modes (RWMs), growing on a time-scale set by a surrounding non-perfectly conducting shell.We propose a novel model that takes into account experimental constraints, such as the actuators dynamics and control latencies, which lead to a multivariable time-delay model of the system. The open-loop field-error characteristics are estimated and a stability analysis of the resulting closed-loop delay differential equation (DDE) emphasizes the importance of the delay effects. We then design a structurally constrained optimal PID controller by direct eigenvalue optimization (DEO) of this DDE. The presented results are substantially based on and compared with experimental data.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2008. 2044-2049 p.
Keyword [en]
Constrained optimization; Delay control systems; Fluid dynamics; Ionization of gases; Magnetohydrodynamics; Plasmas; Proportional control systems; System stability; Time delay
National Category
Control Engineering Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-72652DOI: 10.1109/CDC.2008.4738882ISI: 000307311602028ScopusID: 2-s2.0-62949201233ISBN: 978-1-4244-3123-6OAI: diva2:487905
47th IEEE Conference on Decision and Control, CDC 2008, Cancun, Mexico, 9-11 December, 2008

QC 20120202

Available from: 2012-02-01 Created: 2012-02-01 Last updated: 2014-09-24Bibliographically approved

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Olofsson, K Erik JWitrant, EmmanuelBriat, CorentinBrunsell, Per
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