Design of a DC Busbar for the ITER PF Converter

Guo, Bin; Song, Zhiquan; Xu, Liuwei; Zhang, Ming; Li, Jinchao; Jiang, Li; Fu, Peng; Wang, Min; Dong, Lin

doi:10.1088/1009-0630/16/4/19

Cited by 7 publications

(4 citation statements)

References 3 publications

(2 reference statements)

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“…Each thyristor has an external series fast fuse for short circuit protection and an external paralleled snubber for overvoltage protection. The thyristor, fast fuse and snubber are the key devices of the converter that parameters and types are needed to be determined [12][13][14]. According to the design requirements, the thyristor junction temperature must be lower than 125 °C and the thyristor thermal accumulation is lower than the allowable value during the downstream short circuit of DC reactor, the fast fuse must be melted during the bridge short circuit and must not be melt during the downstream short circuit of the DC reactor, the snubber consisting of resistor and capacitor is needed to reduce the commutation over-voltage to be lower than half max repetitive peak forward voltage of thyristor.…”

Section: High Power Converter Topologymentioning

confidence: 99%

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Preliminary design of high power magnet converter for CRAFT

Wang

Huang

et al. 2020

Plasma Sci. Technol.

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In order to test the superconducting magnet performance for the Comprehensive Research Facility for Fusion Technology (CRAFT) project of China, a power supply converter needs to be designed. In this paper, short circuits upstream and downstream of the direct current (DC) reactor are analyzed, and the thyristor style and the parallel number are determined by the limit analysis of junction temperature and fault current I 2 t. On this basis, the over current and voltage verification of fast fuse are finished to protect the thyristor at fault cases by considering the short circuit of the bridge arm. Then, the resistor and capacitor parameters of thyristor snubber are committed to decreasing the reverse over voltage. These analysis results will be used as the preliminary design of high power magnet converter for CRAFT.

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Section: High Power Converter Topologymentioning

confidence: 99%

“…Therefore, snubber parameters can comply with the requirements. According to equation (12), the single thyristor snubber resistor R and capacitor C are 20 Ω and 1 μF, respectively.…”

Section: Over Voltage Snubber Analysis and Designmentioning

confidence: 99%

Preliminary design of high power magnet converter for CRAFT

Wang

Huang

et al. 2020

Plasma Sci. Technol.

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“…The analysis result shows that the water-cooling method is the better choice for the dc busbar [4] and the cross section of the water-cooling dc busbar is shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 98%

“…Heat loss due to air is by means of natural convection and to the cooling water is by means of force convection. In [4], to get the quick result for comparing the two different cooling methods, joule heat loss to air around the 0093-3813 © 2016 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Temperature Rise in Water-Cooling DC Busbar Through Coupled Force and Natural Convection Thermal-Fluid Analysis

Guo

Song

et al. 2016

IEEE Trans. Plasma Sci.

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This paper describes the coupled force and natural convection analysis technique to calculate the increase in temperature of the international thermonuclear experimental reactor poloidal field converter water-cooling dc busbar. The increase in temperature of the busbar is due to Joule's losses and heat dissipation by cooling water and air convection. Joule's loss is calculated by the 3-D eddy-current field analysis and used as the input for the thermal fluid analysis. Energy conservation equation is coded and the primary natural convection coefficient on the external surface of the dc busbar is calculated. An interactive procedure is proposed to predict the busbar operation behavior. Two sets of computational fluid dynamics analysis are presented to calculate the temperature distribution of the dc busbar, cooling water, and air. One is to solve the force convection heat transfer problem inside the busbar cooling water channel with the primary equivalent natural convection coefficient calculated in energy conservation equation. The other is to solve the natural convection behavior on the dc busbar external wall with the equivalent force convection coefficient on the busbar internal cooling channel. The final temperature distribution result is determined by the two heat convection coefficient difference between these two simulations. The accuracy of the technique developed is verified by comparing the measured and the simulated temperature in a prototype thermal test, which proves the high efficiency and accuracy of the proposed approach in the design of water-cooling dc busbar.Index Terms-DC busbar, force and natural convection, international thermonuclear experimental reactor (ITER) poloidal field (PF) converter, temperature, thermal-fluid, water cooling. NOMENCLATURET 0 , T in Ambient temperature and water inlet temperature. T b , T w Average temperature of dc busbar and water. a, b, l Busbar width, height, and length. V Cooling water velocity. r Cooling channel radius. h a , h w Natural and force convection coefficient. P g Busbar ohm heat load. P w , P a Busbar heat loss to water and air. ρ r Specific resistance of the aluminum.

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