Optimal current profile control for enhanced repeatability of L-mode and H-mode discharges in DIII-D
| Autor: | Tim C. Luce, C. T. Holcomb, Justin Barton, Robert D. Johnson, Ben G. Penaflor, William Wehner, David Humphreys, Eugenio Schuster, J.R. Ferron, M Menno Lauret, Michael L. Walker |
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| Rok vydání: | 2017 |
| Předmět: |
Sequence
Automatic control Computer science Mechanical Engineering Feed forward Trajectory optimization Optimal control 01 natural sciences 010305 fluids & plasmas Nuclear Energy and Engineering Control theory 0103 physical sciences Path (graph theory) Initial value problem General Materials Science 010306 general physics Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 123:513-517 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2017.03.022 |
| Popis: | In this work, model-based control techniques are used to obtain target current profiles in low-confinement-mode (L-mode) as well as high-confinement-mode (H-mode) DIII-D discharges. The control problem is formulated as a trajectory optimization problem to search for a feasible path from the expected initial condition to the desired target. The result comprises a sequence of feedforward (open-loop) control requests and a corresponding state evolution from the initial condition to the desired target. On top of this optimal feedforward control sequence a feedback (closed-loop) controller based on a linearized model and optimal control design techniques is added to track the desired state evolution. The effectiveness of the control approach is demonstrated with experiments. |
| Databáze: | OpenAIRE |
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