Waveform Control of Multi-pulse Flat-top High Magnetic Field Based on Pulsed Generator System

Multi-pulse flat-top high magnetic field (MFHMF) can promote neutron diffraction, terahertz source and other research fields. Due to the limited heat dissipation capability of pulsed magnet, the magnet resistance gradually increases, which leads to incon-sistencies of the waveforms and limits the qu...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2020-06, Vol.30 (4), p.1-1
Main Authors: Xu, Yun, Li, Peicheng, Lu, Chao, He, Xiaolong, Li, Dake, Fang, Yuchao
Format: Article
Language:English
Subjects:
Computer simulation
generalized model predictive control (GPC)
Generators
high magnetic field
identification of resistance parameters
Magnetic fields
Magnetoresistance
Magnetoresistivity
Mathematical model
Neutron diffraction
Power supplies
Power supply
Predictive control
pulsed generator
Rectifiers
Resistance
Superconducting magnets
waveform control
Waveforms
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Summary:Multi-pulse flat-top high magnetic field (MFHMF) can promote neutron diffraction, terahertz source and other research fields. Due to the limited heat dissipation capability of pulsed magnet, the magnet resistance gradually increases, which leads to incon-sistencies of the waveforms and limits the quantity of flat-top magnetic field waveforms. For the sake of getting the MFHMF with high consistency, a pulsed generator-rectifier system is used as the power supply by analyzing the impedance character-istic of multi-pulse magnet in this paper. Based on the accurate external characteristics modeling of power supply, a control method of generalized model predictive control (GPC) is pro-posed. In this GPC method, a 3-level least square method (LSM) is designed to calculate the real-time magnet resistance, and the influence of disturbance by the magnetic resistance is eliminated by the controller. Finally, the results based on MATLAB/ Sim-ulink simulation verified the feasibility and validity of the wave-form control method of MFHMF.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2020.2977008