Plasma position control simulations with PSIM/SIMULINK to validate the WEST divertor coils power supplies topology

The WEST (tungsten (W) Environment Steady-state Tokamak) project consists in the installation of 2 in-vessel coils into Tore Supra. To supply these new coils, a conceptual design of the new divertor coils power supplies was achieved in 2013. To validate power supplies topology (12 pulses thyristor bridges rectification) regarding their impact on the plasma control, detailed simulations have been performed based on a coupled Matlab Simulink / PowerSim (PSIM) software workflow. In Simulink, a linear model of the plasma position/shape evolution computed from the CEDRES++ equilibrium code and a feedback controller of the plasma position have been implemented. In PSIM, the divertor coils power supplies and circuits have been modelled. Based on this coupled model, this paper presents the study of the power supplies effects on the plasma vertical position, proposes the addition of filters to handle the power supplies ripple and finally validate the chosen topology.