Development of power supply for EAST fishtail divertor
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摘要: 为了满足复杂多变的电磁环境对正弦电流精度和变频调幅稳定输出的要求，提出了LC串联谐振理论与高频PWM调制技术相结合的设计思想。研制了一种多频点(10～3800 Hz)、电流高达8000 A的正弦波电源。FTD电源采用直流开关电源技术、SPWM调制技术和LC串联谐振理论。输出电流工作点包括10 Hz@8000 A、20 Hz@6000 A、30～110 Hz@5000 A和1.3～3.8 kHz@2400 A。采用电流反馈和频率反馈控制策略，输出电流精度可达5%。测试结果表明，FTD电源能够满足系统要求，实现了对偏滤器偏转磁场的强度和频率的调节，为偏滤器靶板的粒子热沉积效果的对比实验提供了支持。Abstract: Fishtail Divertor (FTD), a new divertor concept, is a significant research object of EAST tokamak divertor system. To meet the requirements of sinusoidal current precision and variable frequency, the combination of Inductance and Capacitance (LC) series resonance theory and high-frequency Pulse Width Modulation (PWM) technology is put forward. A sine wave power supply with multi frequency points (10-3800 Hz) and current up to 8000 A is developed. The FTD power supply adopts DC switching power technology, Sinusoidal Pulse Width Modulation (SPWM) technology and LC series resonance theory. The operating points of output current include 10 Hz at 8000 A, 20 Hz at 6000 A, 30 to 110 Hz at 5000 A and 1300 Hz to 3800 Hz at 2400 A. The output current accuracy can reach 5% by the current feedback and frequency feedback control strategy. The test results demonstrate that the FTD power supply can meet the system requirements, and it can provide reference for the design of other divertor power supply.
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Key words:
- magnet coil power supply /
- fishtail divertor /
- series resonance /
- EAST /
- sine wave power supply
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图 5 H桥逆变器的电路拓扑及其等效原理图
Figure 5. Circuit topology and equivalent schematic of the H-bridge inverter in FTD magnet coil PS
图 6 电源的电流幅值及频率控制过程流程图
Figure 6. Flow chart of control process for amplitude and frequency of coil current
图 7 在10 Hz调制模式时电源输出电流、变压器的一次和二次电压
Figure 7. Output current, primary and secondary voltage of transformer when the power supply is in 10 Hz modulation mode
图 8 在110 Hz谐振模式时电源输出电流、H桥电压和谐振电压
Figure 8. Output current, H-bridge voltage and resonant voltage when the power supply is in 110 Hz resonant mode
图 9 在1.3 kHz谐振模式时电源输出电流、H桥电压和谐振电压
Figure 9. Output current, H-bridge voltage and resonant voltage when the power supply is in 1.3 kHz resonant mode
表 1 FTD电源的主要技术参数.
Table 1. Main requirements of FTD power supply
rated voltage/V current mode current frequency/Hz current amplitude/A current accuracy ±3500 AC sinusoidal 10 8000 ≤5% ±3500 AC sinusoidal 20 6000 ≤5% ±3500 AC sinusoidal 30～110 5000 ≤5% ±3500 AC sinusoidal 1300 2400 ≤5% ±3500 AC sinusoidal 1800 1800 ≤5% ±3500 AC sinusoidal 2500 1500 ≤5% ±3500 AC sinusoidal 3200 1400 ≤5% ±3500 AC sinusoidal 3800 1200 ≤5% 
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