Grey-Box Modelling of the UPV/EHU Stellarator Coil System

As it is well-known, one of the main problems when dealing with fusion reactors is the plasma instability. The UPV/EHU Stellarator has been constructed to serve as a plasma control testbed so that the plasma behavior within the vacuum chamber may be studied for different real-time control laws. While in most of the large facilities the system control is performed by traditional control laws, the process could be highly improved by the use of advance controllers. For this purpose, a reliable state-space model of the system is needed. In this context, this paper deals with the grey-box modelling of the magnetic confinement coil system of the UPV/EHU Stellarator. The state-space model obtained has been successfully validated by comparing the results of the model with those of the real system. Besides, a Model Predictive Control law has been experimentally implemented over the real-time control system using the proposed state-space model showing an excellent reference trajectory tracking behavior.