Design of magnet power supply system for Quasi-Axisymmetric test of Chinese First Quasi-Axisymmetric Stellarator
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摘要: CFQS 装置是中国西南交通大学（SWJTU）和日本国家核融合科学研究所（NIFS）联合设计制造的中国首台准环对称仿星器，为满足装置0.1 T稳态运行的实验要求，需要为其磁体线圈设计相应的电源系统。本设计方案考虑工程实际估算线路阻抗，考虑工程裕度、电源以负载参数的1.2倍进行计算，并建立电源系统的Simulink仿真模型，分析负载电流纹波大小及网侧谐波含量。根据仿真结果优化设计方案，通过在直流侧增加无源滤波器，减小输出电流纹波，分析直流侧电压代数形式，计算滤波器参数，并仿真调节得到更加符合实际需求的滤波器参数，满足装置准环对称位形的分布磁场精度对磁体线圈电流纹波的要求。Abstract: Chinese First Quasi-Axisymmetric Stellarator (CFQS) is being constructed as an international joint project between the National Institute for Fusion Science in Japan and Southwest Jiaotong University in China. To meet the requirements of 0.1 T steady-state quasi-axisymmetric magnetic field configuration experiment, it is necessary to design and manufacture the corresponding power supply system for its magnet coil. Since the power grid capacity of the laboratory can’t achieve the power consumption required for 0.1 T operation of CFQS, the magnet coil power supply system uses 500 kVA energy storage power station, and the main circuit of the magnet coil power supply system adopts bridge thyristor rectification. In this design scheme, the line impedance is estimated according to the actual engineering situation. Considering the engineering margin, we calculate the power supply at 1.2 times of the actual load parameters, and build the Simulink simulation model of the power supply system to analyze the load current ripple and the harmonic content of the grid side. According to the simulation results, we optimize the design and reduce the output current ripple by adding a passive filter at the DC side. By this way, the output current ripple can meet the requirements of the quasi-axisymmetric magnetic field configuration.
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图 3 等效12脉波电源系统输出电流纹波
Figure 3. Output current ripple of equivalent 12 pulse power supply system
图 9 电源系统网侧电流FFT分析
Figure 9. FFT analysis of network side current of power supply system
表 1 磁体线圈参数
Table 1. Parameters of coils
No. ${R_{\rm{d}}}$/mΩ ${L_{\rm{d}}}$/mH ${I_{\rm{d}}}$/A MC1 435.67 82.52 450 MC2 429.50 81.12 450 MC3 415.62 78.74 450 MC4 401.23 75.97 450 TFC10 228.13 3 220 TFC32 210.00 2.7 220 TFC70 173.57 2.16 220 OV 230.59 18.85 450 IV 73 5 450 
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