Design and Testing of Real-Scale MgB2 Coils for SUPRAPOWER 10-MW Wind Generators

Superconducting MgB2 coils have a promising application niche in large wind generators. The potential implementation as field coils results in machines with smaller size and reduced weight, which is a real benefit compared to conventional nonsuperconducting alternatives. This is a key factor where the wind market demands higher power rate and more compact turbines in order to optimize capital and operational costs. Under the SUPRAPOWER project, a 10-MW direct-drive wind generator concept will be probed through an experimental validator, with superconducting rotating dc coils. For the required temperature, current density, and magnetic field, the available commercial MgB2 wire has been selected, as it is cost effective and well suited compared to other solutions. The aim of the present work is to analyze the operational conditions of MgB2 dc field coils, which are cryogen-free cooled and developed in accordance with SUPRAPOWER generator requirements. This paper deals with the design, manufacturing, and experimental results of full-scale superconducting coils.