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김경화(Kyung-Wha Kim),석원엽(Won-Yeop Seok) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.2
This paper describes the influence of conducting particle in the coaxial cylindrical electrodes under alternating voltage condition investigated using breakdown electric field and electro magnetics simulation method. Simulated particle-location in GIS chamber were the particle on electrode, the particle on enclosure and free moving particle. As results, it was founded that in case of breakdown electric field of the GIS chamber, breakdown electric field of particle on electrode was the lowest, that of free moving particle was middle and that of particle on enclosure was the highest. And in case of the electric field analysis with particle locations, electric field of particle on electrode was the highest, that of lifted particle was middle and that of particle on enclosure was the lowest. This results can offer a practical reference on the insulation design of domestic GIS.
마이닝 시스템을 위한 전원 공급 장치의 새로운 역률 제어 기법
이동윤(Dong-Yun Lee),석원엽(Won-Yeop Seok),최민환(Min-Whan Choi),박상호(Sang-Ho Park),황진호(Jin-Ho Hwang),정인학(In-Hak Jeong) 산업기술교육훈련학회 2020 산업기술연구논문지 (JITR) Vol.25 No.1
In this paper, we propose a novel power-factor control technique that regulates the input power factor and output voltage in accordance with the number of GPUs (Graphics Processing Unit) for digital currency mining. This technique is applied in order to control the power factor of the input side of the power supply system and supply power to the mining system. The proposed new power-factor control technique has the advantage of reducing the switching loss of the rectifier side of the power supply for the mining system by controlling the conduction angle through which the current at the input side of the rectifier is conducted. The control principle of the proposed new power-factor control technique is described in detail by applying the technique to a power supply of a mining system consisting of a plurality of GPUs, and its validity is verified through numerous simulations.