JT-60 power supplies

Shimada, Ryuichi; Tsuneoka, M.; Matsukawa, T.; Aoyagi, T.; Oumori, K.; Mizuno, M.; Matsukawa, M.; Takahashi, S.; Shiina, M.; Miya, N.; Arakawa, K.; Tamura, Shinichi

doi:10.1016/s0920-3796(87)90556-4

Cited by 40 publications

(8 citation statements)

References 4 publications

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“…The ac-1051-8223/$26.00 © 2011 IEEE tual voltage of the JT-60U power supply system [4], [5] was measured to evaluate the maximum voltage. The JT-60U power supply is similar to JT-60SA power supply in the maximum voltage and the total power.…”

Section: A Voltage Fluctuations Of Power Supplymentioning

confidence: 99%

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Resonance Characteristics and Maximum Turn Voltage of JT-60SA EF Coil

Murakami

Kizu

Tsuchiya

et al. 2012

IEEE Trans. Appl. Supercond.

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The withstand voltage of the turn insulation is one of the most essential issues for the superconducting magnet system. There is a possibility that the actual differential voltage between each turns, called turn voltage in this paper, is larger than the maximum turn voltage under the ideal condition because of the voltage fluctuations of the power supply and the inhomogeneous voltage distribution in the magnet induced by the resonance phenomenon. The actual turn voltage was evaluated by the voltage measurements and the circuit simulation. The actual voltage of the large power supply, JT-60U power supply, was measured. The results indicated that the actual maximum voltage increase the 20% from rated voltage of the power supply. The margin of the insulation voltage is generally much larger than 20%. This amplitude of the voltage fluctuations is permissible for the design of the turn insulation. The resonance characteristic test was performed using the copper dummy pancake. The test results suggested that the resonance frequency of the EF4 pancake was about 56 kHz. The resonance characteristics of the real coil was also evaluated by the numerical method based on the lumped parameter circuit model. The resonance frequencies of the EF4 coil were calculated as 180 kHz, 300 kHz and the several higher frequencies. The main frequency component of the power supply is less than 5 kHz. The influence of the resonance phenomenon on the maximum turn voltage is negligible small.

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Section: A Voltage Fluctuations Of Power Supplymentioning

confidence: 99%

“…Those voltages increase the maximum voltage of the power supply. The actual voltage of the large power supply system, JT-60U power supply [4], [5], was measured to estimate the maximum voltage.…”

Section: Introductionmentioning

confidence: 99%

Resonance Characteristics and Maximum Turn Voltage of JT-60SA EF Coil

Murakami

Kizu

Tsuchiya

et al. 2012

IEEE Trans. Appl. Supercond.

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“…For instance, the DC power supply system for the JT-60 is composed of the diode rectifiers and the thyristor converters. Especially, the rated current of the thyristor converter for the poloidal field power supply is over 100 kA [1].…”

Section: Introductionmentioning

confidence: 99%

Power factor correction of large current line commutated converters using variable series capacitors

Matsumoto

Nomura

2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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Diode rectifiers and thyristor converters are very promising as a large current power supply for high field magnets such as fusion magnets, superconducting magnetic energy storage. The objective of this work is to discuss the power factor correction of the line commutated converters using variable series capacitors. The diode rectifier can control the DC voltage with a resulting leading power factor on the AC side by controlling the series capacitance. On the other hand, thyristor converters can control the DC voltage with a lagging power factor on the AC side by controlling the firing angle. Therefore, by combining the two, the hybrid converter system can control the DC voltage of high field magnets with both leading and lagging power factors seen from the AC system. Furthermore, the reactive power compensation need can be reduced to 50 % compared to a full classical thyristor converter system with conventional shunt compensators. From the experimental results using a gate-commuted series capacitor (GCSC), the authors demonstrated the DC voltage control capability of the diode rectifier with a leading power factor, and the active and reactive power control capability of the hybrid converter system.

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“…Thyristor converters are very promising as a large current power conditioning system for high field magnets [3,4]. However, thyristor converters control the DC coil voltage with a lagging power factor on the AC side, and require reactive power compensation.…”

Section: Introductionmentioning

confidence: 99%

Design study on series compensated thyristor converters for large scale SMES

Nomura

Chikaraishi

Shimada

2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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Superconducting magnetic energy storage (SMES) will be one of the feasible options for daily load leveling and power stabilization. Since the stored energy of SMES is proportional to the square of current, the rated current for superconducting coils will be selected to at least over 10 kA. Thyristor converters are very promising as a large current power conditioning system for high field magnets. The authors proposed the feasibility of the series compensation of thyristor converters applied to power conditioning system for superconducting coils. Using variable series capacitors, the thyristor converters can control the DC coil voltage with a resulting leading power factor. Combined with a classical thyristor converter operated with a lagging power factor, the combined converter system enables the power factor correction of the thyristor converters. The authors developed a prototype combined thyristor converter system using a gate-commuted series capacitor (GCSC), and verified the active power control capability of a superconducting coil with unity power factor. Additionally, both leading and lagging reactive power control capabilities of the combined system were also demonstrated. The authors also carried out a conceptual design of the 60-MW combined thyristor converter system applied to 360-MWh SMES for daily load leveling. From the results, the required capacity of the series compensators becomes 52 MVar to provide 60 MW of the rated output power. This capacity corresponds to 50% of the required capacity for the pure classical thyristor converter system with conventional shunt compensators.

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JT-60 power supplies

Cited by 40 publications

References 4 publications

Resonance Characteristics and Maximum Turn Voltage of JT-60SA EF Coil

Resonance Characteristics and Maximum Turn Voltage of JT-60SA EF Coil

Power factor correction of large current line commutated converters using variable series capacitors

Design study on series compensated thyristor converters for large scale SMES

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