Design and analysis of a high power supply for the research system of superconducting magnets

摘要

To test superconductors with high performance such as Nb3Sn Cable-in-Conduit Conductor (CICC) and superconducting magnets from small scale to large scale, the background magnetic field with high homogeneity is necessary. As a major national science and technology infrastructure project in china, the peak magnetic field of the Research System of Superconducting Magnets (RSSMs) can be up to 15 T and the maximum change rate of magnetic field is 1.5 T/s. To supply electrical power for the RSSMs including the background field superconducting magnet and the tested objects in the meanwhile, a direct current (DC) high power supply rated at 360 MW was designed, the rated current, ripple current and rated voltage are 240 kA, 1 kA and 1.5 kV respectively. Additionally, the maximum output pulse current, the ramp up speed and the pulse width in pulse mode of the DC high power supply are 1000 kA, 5000 kA/s and 100 ms respectively. As a result, the alternating current (AC) power supply system was estimated from the view point of available power. To reduce the ripple of the DC high power supply, the topology of eight power blocks' parallel connection with the interleaved control method is put forward. The simulating results of circulating current and pulse operation indicate the design proposal is an alternative option.