CAT-1偶极场超导磁体的悬浮控制与仿真

Simulation of levitated control system of floating superconducting magnet for CAT-1 dipole device

“天环一号”(China Astro-Torus 1,CAT-1)是一个悬浮偶极场磁约束装置,主要用于偶极场等离子体物理实验研究,要求中心悬浮超导磁体在无冷却和无电源条件下稳定悬浮至少5 h。本文设计了超导托举磁体与中心悬浮磁体环耦合的悬浮控制系统,为确保1200 kg、5 MA中心悬浮磁体环稳定悬浮,完成了控制系统的Simulink模型建立和仿真,基于Routh-Hurwitz稳定判据,研究了PID(Proportion-Integral-Derivative)控制策略对稳定控制影响,确定了稳定控制参数选取的范围:理想条件下PD(Proportion-Derivative)控制系统上升时间为0.1545 s、峰值时间为0.6283 s、调节时间0.0848 s。结果表明:基于PD控制能够在较短的时间内将悬浮超导环恢复在预设平衡位置,采用合适的启动方式可极大地降低电路的负载。本结果为悬浮超导悬浮偶极场装置设计研发提供了关键技术支撑。

[Background]CAT-1(China Astro-Torus 1)is a levitated dipole field magnetic confinement device,which mainly used for dipole plasma physics experiments,requiring a central floating superconducting coil to be stably levitated for at least 5 h without cooling or power supply.[Purpose]This study aims to design a levitation control system of coupling superconducting levitation coil and floating coil for CAT-1 dipole device.[Methods]According to the design parameters of the suspension magnet system of the CAT-1 device,Simulink model of the control system was established and applied to the simulation.Based on Routh-Hurwitz stability criterion,the influence of PID(Proportion-Integral-Derivative)control strategy on stability control was studied.The selection range of stability control parameters was determined to ensure the stable levitation of 1200 kg,5 MA floating magnet.[Results]Simulation results show that under ideal conditions,delay time of the PD(Proportion-Derivative)control system is 0.0463 s,rise time is 0.1545 s,peak time is 0.6283 s,adjustment time is 0.0848 s,and overshotδ=1.6.It means that PD can restore the levitated superconducting ring to the preset balance position in a short time,and the load of the circuit can be greatly reduced by adopting the appropriate starting mode.[Conclusion]The results provide key technical support for the design and development of levitated superconducting dipole field devices.