Power supply for generating frequency-variable resonant magnetic perturbations on the J-TEXT tokamak

Guo XU (徐国); Bo RAO (饶波); Yonghua DING (丁永华); Mao LI (李茂); Da LI (李达); Ruo JIA (贾若); Minxiong YAN (严民雄); Xinke JI (吉新科); Nengchao WANG (王能超); Zhuo HUANG (黄卓); Daojing GUO (郭道靖); Lai PENG (彭莱)

doi:10.1088/2058-6272/aabd2f

Plasma Science and Technology > 2018 > 20(8): 85601-085601. > DOI: 10.1088/2058-6272/aabd2f

Guo XU (徐国), Bo RAO (饶波), Yonghua DING (丁永华), Mao LI (李茂), Da LI (李达), Ruo JIA (贾若), Minxiong YAN (严民雄), Xinke JI (吉新科), Nengchao WANG (王能超), Zhuo HUANG (黄卓), Daojing GUO (郭道靖), Lai PENG (彭莱). Power supply for generating frequency-variable resonant magnetic perturbations on the J-TEXT tokamak[J]. Plasma Science and Technology, 2018, 20(8): 85601-085601. DOI: 10.1088/2058-6272/aabd2f

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Power supply for generating frequency-variable resonant magnetic perturbations on the J-TEXT tokamak

¹ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
² School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China

Funds: This work was supported by the National ITER Project Foundation of China (No. 2014GB118000) and National Natural Science Foundation of China (No. 11405068).

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Received Date: March 15, 2018

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Abstract

Abstract

To further research the response of the tearing mode (TM) to dynamic resonant magnetic perturbation (DRMP) on the J-TEXT tokamak, a modified series resonant inverter power supply (MSRIPS) with a function of discrete variable frequency is designed for DRMP coils in this study. The MSRIPS is an AC–DC–AC converter, including a phase-controlled rectifier, an LC filter, an insulated gate bipolar transistor (IGBT) full bridge, a matching transformer, three resonant capacitors with different capacitance values, and three corresponding silicon controlled rectifier (SCR) switches. The function of discrete variable frequency is realized by switching over different resonant capacitors with corresponding SCR switches while matching the corresponding driving frequency of the IGBT full bridge. A detailed switching strategy of the SCR switch is put forward to obtain sinusoidal current waveform and realize current waveform smooth transition during frequency conversion. In addition, a resistor and thyristor bleeder is designed to protect the SCR switch from overvoltage. Manufacturing of the MSRIPS is completed, and the MSRIPS equipment can output current with an amplitude of 1.5 kA when its working frequency jumps among different frequencies. Moreover, the current waveform is sinusoidal and can smoothly transition during frequency conversion. Furthermore, the transition time when the current amplitude rises from zero to a steady state is less than 2 ms during frequency conversion. By using the MSRIPS, the expected discrete variable frequency DRMP is generated, and the phenomenon of the TM being locked to the discrete variable frequency DRMP is observed on the J-TEXT tokamak.
- tearing mode,
- J-TEXT,
- series resonant inverter,
- discrete variable frequency,
- silicon controlled rectifier

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References

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Power supply for generating frequency-variable resonant magnetic perturbations on the J-TEXT tokamak