Title :
Development of New Fast Control Power Supply for EAST
Author :
Huang, Heng ; Cheng, William ; Wang, Huifang ; Gao, G. ; Wu, Yaowu
Author_Institution :
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China
Abstract :
Experimental Advanced Superconducting Tokamak (EAST), a National Mage project of Science Research of China, is a very important fusion experiment facility. The ability of magnetic confinement to plasma can be improved by elongating plasma cross section in EAST. However, elongated plasma has vertical displacement instability; without control, plasma will dash against a wall of vacuum vessel and disrupt, which will cause failure of plasma discharge. Therefore, a feedback control system is needed to restrain plasma vertical displacement. Fast control power supply excites active feedback coils, which produces magnetic field to control plasma´s displacement. With the development of EAST, the power supply needs to keep on enhancing the ability of fast response and output current. The structure and control method of the new power supply are introduced in this paper. The technique of carrier-wave phase-shift pulsewidth modulation is applied to raise equal switch frequency of converter and improve performance of output wave. The analysis of harmonic and the simulation are carried out, the validity of the proposed scheme and control strategy are confirmed by experiments, and the power supply system can supply large current and has the ability of fast response.
Keywords :
Harmonic analysis; Magnetic fields; Plasmas; Power supplies; Pulse width modulation; Tokamaks; Toroidal magnetic fields; Active feedback; Experimental Advanced Superconducting Tokamak (EAST); H-bridges cascaded and paralleled; fast control power supply; phase-shift pulsewidth modulation (PWM); plasma; vertical unstable displacement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2271985