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 inconsistencies 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 characteristic 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 proposed. 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/ Simulink simulation verified the feasibility and validity of the waveform control method of MFHMF.