Power Supply Optimization for the Superconducting Coil System of HELIAS Fusion Reactor

A. power supply system for feeding the superconducting coils of the Helias reactor, an upgraded system of the WENDELSTEIN-7X device, has been investigated. This multi- converter supply system has been optimized, in view of low losses in the components and only small negative impact to the power grid. The design of the optimized multi-converter supply system was studied by means of computer simulations, using the SIMPLORER code. The influence of the passive structures on operation of the power supply system was taken into account. The computation of induced eddy currents in the coil structure during transient processes are transformed into electric network analyses using the inductance and resistance data of the nonplanar coils and their coil housings, by means of the finite element network (FEN) method. This approximation allows the investigation of the whole coil system including power supplies and passive structures.