Data-Driven Modeling and Control of the Poloidal Flux Profile for Advanced Tokamak Scenarios in DIII-D
W. Wehner, W. Shi, E. Schuster, D. Moreau, M. L. Walker and J.R. Ferron
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Providence, Rhode Island, USA, October 29 - November 2, 2012
Abstract
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Theory-based mathematical models derived from flux averaged transport
equations may result in complex expressions not suitable for real-time
control implementation. At the expense of less model accuracy and
controller capability, data-driven linear models constructed from
system identification techniques offer a potentially practical and
relatively simple alternative suitable for control design when the
goal is regulation around an equilibrium point. This work considers
the evolution of the poloidal flux profile in response the inductive
electric field as well as to heating and current drive (H&CD) systems.
Based on the identified linear models, an optimal state feedback
controller with integral action is designed to regulate the poloidal
flux profile around a desired target in the pres- ence of perturbations.
Closed-loop experiments on DIII-D and simulations based on predictive
codes illustrate the effectiveness of the controller.