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Cascade and multibatch subspace system identification for multivariate vacuum-plasma response characterisation
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (System Identification Group)ORCID iD: 0000-0003-0355-2663
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (System Identification Group)ORCID iD: 0000-0002-9368-3079
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-5259-0458
Show others and affiliations
2011 (English)In: Proceedings of the 50th IEEE Conference on Decision and Control and European Control Conference (CDC-ECC11), 2011, 2614-2619 p.Conference paper, Published paper (Refereed)
Abstract [en]

A particular cascade structure system identification problem is formulated for the purpose of characterizing the vacuum-plasma response for a magnetic confinement fusion experiment. A predictor-form closed-loop subspace system identification approach is advocated due to (i) plant instability (ii) sizes of input-output vectors and (iii) inherent multivariate eigenmodes of the physical system. Since experiment data come in relatively short batches, specialised means for data merging for subspace identification are developed. A batchwise deletegroup jackknife procedure is utilised to estimate the standard error of the estimate of the dominant unstable empirical plasma response eigenvalue.

 

Place, publisher, year, edition, pages
2011. 2614-2619 p.
National Category
Control Engineering
Research subject
SRA - ICT
Identifiers
URN: urn:nbn:se:kth:diva-72596ISI: 000303506203036Scopus ID: 2-s2.0-84860650429OAI: oai:DiVA.org:kth-72596DiVA: diva2:488338
Conference
50th IEEE Conference on Decision and Control and European Control Conference
Note

QC 20120508

Available from: 2012-02-01 Created: 2012-01-31 Last updated: 2013-04-29Bibliographically approved
In thesis
1. Nonaxisymmetric experimental modal analysis and control of resistive wall MHD in RFPs: System identification and feedback control for the reversed-field pinch
Open this publication in new window or tab >>Nonaxisymmetric experimental modal analysis and control of resistive wall MHD in RFPs: System identification and feedback control for the reversed-field pinch
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The reversed-field pinch (RFP) is a device for magnetic confinement of fusion plasmas. The main objective of fusion plasma research is to realise cost-effective thermonuclear fusion power plants. The RFP is highly unstable as can be explained by the theory of magnetohydrodynamics (MHD). Feed-back control technology appears to enable a robustly stable RFP operation.  Experimental control and identification of nonaxisymmetric multimode MHD is pursued in this thesis. It is shown that nonparametric multivariate identification methods can be utilised to estimate MHD spectral characteristics from plant-friendly closed-loop operational input-output data. It is also shown that accurate tracking of the radial magnetic field boundary condition is experimentally possible in the RFP. These results appear generically useful as tools in both control and physics research in magnetic confinement fusion.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. ix, 101 p.
Series
Trita-EES, 2012:20
Keyword
Magnetic confinement fusion, Reversed-field pinch, System identification, Magnetohydrodynamics, Modal analysis, Automatic control, Resistive wall modes
National Category
Fusion, Plasma and Space Physics Control Engineering Signal Processing
Identifiers
urn:nbn:se:kth:diva-94096 (URN)978-91-7501-359-6 (ISBN)
Public defence
2012-06-01, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20120508

Available from: 2012-05-08 Created: 2012-05-07 Last updated: 2013-12-04Bibliographically approved

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Rojas, Cristian R.Hjalmarsson, HåkanBrunsell, Per

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Olofsson, K. Erik J.Rojas, Cristian R.Hjalmarsson, HåkanBrunsell, PerDrake, James
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