Kalman filters for real-time magnetic island phase tracking
| Autor: | M Menno Lauret, D.P. Borgers, M.R. de Baar |
|---|---|
| Přispěvatelé: | Control Systems Technology |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Tokamak Mechanical Engineering Phase (waves) Kalman filter Tracking (particle physics) 01 natural sciences 010305 fluids & plasmas law.invention Phase-locked loop Extended Kalman filter Amplitude Nuclear Energy and Engineering ASDEX Upgrade law Control theory 0103 physical sciences General Materials Science 010306 general physics Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design, 88, 2922-2932 Fusion Engineering and Design, 88(11), 2922-2932. Elsevier |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2013.06.014 |
| Popis: | For control of neoclassical tearing modes (NTMs) and the resulting rotating magnetic islands in tokamak plasmas, the frequency and phase of the magnetic islands need to be accurately tracked in real-time. In previous experiments on TEXTOR, this was achieved using a phase-locked loop (PLL). For ASDEX Upgrade however, the desired frequency range in which the islands are to be tracked (100 Hz-10 kHz) is much larger than is possible with a PLL. In this contribution, an extended Kalman filter (EKF) and an unscented Kalman filter (UKF) are proposed for real-time frequency, phase and amplitude tracking of sinusoidal signals, based on noisy measurements. Compared to PLLs, the EKF and UKF are able to track sinusoidal signals in a much larger frequency range. The filters are applied on synthetic data and on experimental data from the TEXTOR and TCV tokamaks, from which we conclude that the UKF can be useful for real-time control of magnetic islands on ASDEX Upgrade. (C) 2013 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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