Preliminary design of high power magnet converter for CRAFT

Abstract

In order to test the superconducting magnet performance for the Comprehensive Research Facility for Fusion Technology (CRAFT) project of China, a power supply converter needs to be designed. In this paper, short circuits upstream and downstream of the direct current (DC) reactor are analyzed, and the thyristor style and the parallel number are determined by the limit analysis of junction temperature and fault current I 2 t. On this basis, the over current and voltage verification of fast fuse are finished to protect the thyristor at fault cases by considering the short circuit of the bridge arm. Then, the resistor and capacitor parameters of thyristor snubber are committed to decreasing the reverse over voltage. These analysis results will be used as the preliminary design of high power magnet converter for CRAFT.

On a Novel Topology of Matrix Converter Applied to Accelerator DC Power Supply

“…e study is a continuation of our preliminary researches [21,22]. Since the performance of accelerator power supply largely depends on the choice of main circuit topology and control strategy [23,24], the matrix converter and its novel modulation strategy proposed in the article based on practical current-type magnetizing power supply are a prospective solution to the above problems.…”

Analysis and verification of electrodynamic force, thermal stress and current sharing for CRAFT converter structure design

“…The power supply of CRAFT is mainly composed of four sets of converter units, each rated at 0.25 kV/25 kA, which are designated for the performance evaluation of a superconducting magnet [6]. To guarantee that the CRAFT converter meets experimental demands, it is imperative to verify the reliability of the converter structure through meticulous topological design and fault analysis [7,8]. This entails ensuring that the CRAFT converter can endure the maximum fault current without significant structural damage.…”