[논문]Model predictive control of KSTAR equilibrium parameters enabled by TRANSP

Boyer, M.D.; Yuan, X.; Ahn, J.; Hahn, S-H.; Nazikian, R.; Poli, F. M.; Sabbagh, S.

doi:10.1088/1741-4326/ab9c4a

[해외논문] Model predictive control of KSTAR equilibrium parameters enabled by TRANSP

Nuclear fusion. Fusion nucléaire. &n.Illigat;&n.Arligat;derny&n.ibreve; sintez. Fusión nuclear, v.60 no.9, 2020년, pp.096007 -

Boyer, M.D. (Princeton Plasma Physics Laboratory, Princeton, NJ, United States of America) , Yuan, X. (Princeton Plasma Physics Laboratory, Princeton, NJ, United States of America) , Ahn, J. (Columbia University, New York, NY, United States of America) , Hahn, S-H. (National Fusion Research Institute, Daejeon, Korea, Republic Of) , Nazikian, R. (Princeton Plasma Physics Laboratory, Princeton, NJ, United States of America) , Poli, F. M. (Princeton Plasma Physics Laboratory, Princeton, NJ, United States of America) , Sabbagh, S. (Columbia University, New York, NY, United States of America)

Abstract ▼ AI-Helper

Due to the complex behavior of tokamak plasmas and the importance of optimizing performance while avoiding instabilities and machine limits, plasma control algorithms are becoming increasingly dependent on sophisticated model-based control approaches. It is anticipated that the use of integrated modeling codes in the model-based control design process will reduce the amount of experimental time needed to implement new control algorithms by facilitating development of control-oriented models and enabling higher-fidelity closed-loop simulations. In this work, a reduced model is developed from a series of TRANSP simulations and is used to develop a model predictive control (MPC) algorithm for controlling important equilibrium parameters in KSTAR [1] discharges. The control algorithm uses the KSTAR neutral beam injection system and the target plasma current and plasma boundary as actuators, and optimizes the plasma stored energy, loop voltage, and internal inductance while avoiding constraints that could lead to disruptions. Higher fidelity testing of the control algorithm is performed using a flexible framework for enabling external processes to actively control plasma parameters in TRANSP simulations. Closed-loop simulations demonstrate the ability of the control algorithm to respond to disturbances in density and confinement, handle actuator failures, and move the discharge to high non-inductive fraction conditions.

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