Actuator-sharing Algorithm for Simultaneous Regulation of Multiple Plasma Properties with Coupled Dynamics
S.T. Paruchuri, E. Schuster
29th IAEA Fusion Energy Conference
London, UK, October 16-21, 2023
Abstract
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The plasma control system (PCS) of next-generation tokamaks like ITER and the Fusion Pilot Plant (FPP) must
simultaneously regulate multiple plasma properties. Control solutions to drive individual plasma properties to their targets have
been and are being developed over the years. The input commands of each control algorithm must be translated into physical
actuator requests such as the auxiliary drive powers and deposition locations before implementation. Any such conversion
must account for the complex coupling between the different plasma properties. The possibility of having an individual
physical input affecting multiple plasma properties makes the input conversion even more challenging. This work proposes
a tokamak and scenario-agnostic actuator-sharing algorithm that can convert individual controller commands into physical
actuator requests while accounting for the constraints introduced by coupled plasma properties. The proposed algorithm
does not rely on real-time optimization, the most commonly used method for actuator sharing and allocation, which can be
computationally expensive. Furthermore, the algorithm is designed to handle real-time changes in controller objectives and
actuator availability. The effectiveness of the proposed algorithm has been demonstrated using nonlinear DIII-D tokamak
simulations in the Control Oriented Transport SIMulator (COTSIM).