Data-driven Model-based Combined Magnetic and Kinetic Control on DIII-D
W. Shi, W. Wehner, J. Barton, M.D. Boyer, 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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In order to take into account the coupling between the different
magnetic and kinetic parameters, a multi-input-multi-output (MIMO)
model-based controller is introduced to regulate the rotational
transform profile and βN in DIII-D. This approach is based on a linear
two-time-scale model derived from experimental data. A singular value
decomposition of the plasma model is carried out to decouple the
system and identify the most relevant control channels. Then, a
robust-control technique is used to determine a controller that
minimizes the ref- erence tracking error and rejects external
disturbances with minimal control energy. Finally, the feedback
controller is augmented with an anti-windup compensator, which keeps
the given controller well behaved in the presence of actuator
saturation. Experimental results illustrate the performance of the
proposed controller, which is one of the first plasma profile
controllers integrating magnetic and kinetic variables implemented in
DIII-D.