Browsing by Author "Grasso, Gianni"
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Item Design and Testing of Real-Scale MgB2 Coils for SUPRAPOWER 10-MW Wind Generators(2016-04) Sarmiento, G.; Sanz, Santiago; Pujana, A; Merino, Jose Maria; Marino, Iker; Tropeano, Matteo; Nardelli, Davide; Grasso, Gianni; Tecnalia Research & Innovation; DIGITAL ENERGYSuperconducting 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.Item Experimental Study and Simulation of Quench in MgB2 Coils for Wind Generators(2016-01-18) Sanz, Santiago; Sarmiento, G.; Pujana, Ainhoa; Merino, Jose Maria; Tropeano, Matteo; Nardelli, Davide; Grasso, Gianni; Sun, Jiuce; Toral, Fernando; Marino, Iker; Tecnalia Research & Innovation; DIGITAL ENERGYIn the frame of the European Union (EU) founded SUPRAPOWER Project, MgB2 conduction-cooled coils are foreseen to be used in the rotor of synchronous wind turbine generators. As a result, a conceptual design of a 10 MW superconducting (SC) generator will be made and a Rotating Magnetic Validator (RMV) will be constructed and tested, with two rotating SC coils. The main dimensions and working conditions will be kept in the RMV and in the 10 MW generator. The RMV has been conceived is such a way that it can be transformed in a generator. Numerical quench simulations have to be performed in order to design a suitable quench protection system. Due to the uncertainty of some material properties and its importance for the machine operation, an experimental validation must be performed in order to resolve discrepancies. Under this premises, a full size MgB2 double pancake coil have been manufactured and instrumented to trigger a controlled quench.