TY - GEN
T1 - First-principles-driven model-based optimal control of the current profile in NSTX-U
AU - Ilhan, Zeki Okan
AU - Wehner, William
AU - Barton, Justin
AU - Schuster, Eugenio
AU - Gates, David
AU - Gerhardt, Stefan
AU - Menard, Jonathan
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/11/4
Y1 - 2015/11/4
N2 - Regulation in time of the toroidal current profile is one of the main challenges toward the realization of the next-step operational goals for the National Spherical Tokamak eXperiment - Upgrade (NSTX-U). In this work, a nonlinear, control-oriented, physics-based model describing the temporal evolution of the current profile is first obtained by combining the magnetic diffusion equation with empirical correlations obtained for the electron density, electron temperature, and non-inductive current drives in NSTX-U. The proposed model is then embedded into the control design process to synthesize a time-variant, linear-quadratic-integral, optimal controller capable of regulating the safety factor profile around a desired target profile while rejecting disturbances. Neutral beam injectors, electron density, and the total plasma current are used as actuators to shape the current profile. The effectiveness of the proposed controller in regulating the safety factor profile in NSTX-U is demonstrated in closed-loop nonlinear simulations.
AB - Regulation in time of the toroidal current profile is one of the main challenges toward the realization of the next-step operational goals for the National Spherical Tokamak eXperiment - Upgrade (NSTX-U). In this work, a nonlinear, control-oriented, physics-based model describing the temporal evolution of the current profile is first obtained by combining the magnetic diffusion equation with empirical correlations obtained for the electron density, electron temperature, and non-inductive current drives in NSTX-U. The proposed model is then embedded into the control design process to synthesize a time-variant, linear-quadratic-integral, optimal controller capable of regulating the safety factor profile around a desired target profile while rejecting disturbances. Neutral beam injectors, electron density, and the total plasma current are used as actuators to shape the current profile. The effectiveness of the proposed controller in regulating the safety factor profile in NSTX-U is demonstrated in closed-loop nonlinear simulations.
UR - https://www.scopus.com/pages/publications/84964344558
UR - https://www.scopus.com/pages/publications/84964344558#tab=citedBy
U2 - 10.1109/CCA.2015.7320792
DO - 10.1109/CCA.2015.7320792
M3 - Conference contribution
AN - SCOPUS:84964344558
T3 - 2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings
SP - 1303
EP - 1308
BT - 2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE Conference on Control and Applications, CCA 2015
Y2 - 21 September 2015 through 23 September 2015
ER -