Current Density Profile Control via Model Predictive Control in EAST
H. Wang, W. Wehner, E. Schuster
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Milwaukee, WI, USA, October 23-27, 2017
Abstract
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Extensive studies have shown that the current density profile, which
is closely related to poloidal magnetic flux profile, is a key factor
to achieving advanced tokamak operating scenarios that are characterized
by improved confinement and possible steady-state operation. In this
work, a first-principles-driven, control-oriented model of the poloidal
magnetic flux profile evolution is used to design a feedback controller
via model predictive control (MPC) for EAST. The goal of the feedback
controller is to regulate the poloidal magnetic flux profile evolution
around a desired trajectory by minimizing the difference between desired
and actual profiles. Due to external disturbances, non-modeled dynamics,
and perturbation in initial conditions, feedforward-only control solutions
usually fail in achieving the desired trajectory. Simulation results
illustrate the capability of the proposed model predictive controller
in tracking the desired profile by optimizing in real time the actuator
waveforms.