Modeling and Control for the ITER Gas Injection System

This thesis presents the modelling and control of the ITER Gas Injection System. The non-linear models for both the valve and the pipe are formulated using the port-Hamiltonian approach. The primary focus of this study is the valve model, which incorporates both the mechanical and electrical domains, as well as the nonlinear coupling between them. An observer is designed for the valve to reconstruct the system states from the gas flow measurement at the valve output. A passivity-based controller is then developed to regulate gas flow into the tokamak vacuum vessel. The valve model is implemented in the ITER simulation platform PCSSP and validated with experimental data. The control algorithm is implemented and tested in simulation.