| With the development of magnetic confining fusion research,the operating parameters of the Tokamak device are continuously improved,and the magnetic field environment around the device is also increasingly bad,which will seriously affect the reliable operation of the electric and electronic equipment around the Tokamak device,and even threaten the safety of the device.In addition,the magnetic field environment around the magnet power supply is also bad,with strong power frequency stray magnetic field.The interference caused by strong stray magnetic field has become a potential threat to the stable operation of tokamak devices.The study of the strong stray magnetic field interference problem is of great significance to ensure the reliable operation of the large tokamak device in the future.The magnetic field immunity test and research platform is a necessary prerequisite for the study of strong stray magnetic field,which mainly composed of test coil and power supply.Due to the high stray magnetic field intensity of Tokamak device and magnet power supply,and the test platform needs to take into account both the steady-state magnetic field and the power frequency magnetic field test,the design of coil and power supply is a great challenge.In this paper,the 0.3m/200 m T magnetic field immunity test platform is taken as the research object,and the design and research of the test coil and power supply are carried out.The specific contents are as follows:Aiming at the design of large size and high uniformity magnetic field coil,the design scheme of coaxial double coil is determined by comparing and analyzing the design scheme of high uniformity magnetic field coil.Considering the distribution of current across the cross section of the coil,the quantitative relationship between the structural parameters of the coil and the characteristics of the generated test magnetic field is studied,and the optimal design parameters of the coil are obtained.Based on the design parameters,the coil structure design was carried out,and the uniformity of the tested magnetic field under the real coil structure was analyzed based on the finite element method to verify the coil structure design.Then,the water-cooling design of the coil was carried out,and the simulation verification was carried out based on the fluid analysis software.Finally,the development of the test coil is completed.Aiming at the design of wide-output,high-precision,AC/DC hybrid high-power test power supply,a new power supply topology is proposed,and the control scheme is designed and verified by simulation.The working principle and operation efficiency of different power topologies are compared and analyzed.Based on the principle of low output ripple,good adjustable and low full load loss,a suitable power topology is determined.Based on this topology,the key device parameters of the power supply are designed.The power supply control strategy is designed,including rectifier control and current sharing control of parallel output modules.And a Simulink simulation model of the power supply is built to verify the circuit topology and control strategy.The simulation results show that the proposed design scheme is reasonable.Finally,based on RT Box and DSP28335,a hardware-in-the-loop simulation platform was built,and the DSP control program was debugged to make it run normally,which laid a foundation for the debugging and operation of the power supply in the later stage.The test coil and power supply are the two core components of the magnetic field immunity test platform.This paper has carried out design research on the test coil and power supply,which provided a feasible solution for the 0.3m/200 m T magnetic field immunity test platform.And also provides a reference for the design of similar test coil and power supply. |
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