http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
배터리 기반 2단 충전 9 kJ/s 고전압 충전기 설계
조찬기,가재예,류홍제 전력전자학회 2019 전력전자학회 논문지 Vol.24 No.4
A lithium polymer battery-based 9 kJ/s high-voltage capacitor charger, which comprises two stages, is proposed. A modified LCC resonant converter and resonant circuit are introduced at the first and second stages, respectively. In the first stage, the methods for handling low-voltage and high-current batteries are considered. Delta-wye three-phase transformers are used to generate a high output voltage through the difference between the phase and line-to-line voltages. Another method is placing the series resonant capacitor of the LCC resonant components on the transformer secondary side, which conducts considerably low current compared with the transformer primary side. On the basis of the stable operation of the first charging stage, the secondary charging stage generates final output voltage by using the resonance. This additional stage protects the rectifying diodes from the negative voltage when the output capacitor is discharged for a short time. The inductance and capacitance of the resonance components are selected by considering the resonance charging time. The design procedure for each stage with the aforementioned features is suggested, and its performance is verified by not only simulation but also experimental results.
Rogowski Coil과 Current Transformer의 직렬 아크 사고 측정 신호 비교
조찬기(Chan-Gi Cho),안재범(Jae-Beom Ahn),이진한(Jin-Han Lee),김용주(Yong-Joo Kim),류홍제(Hong-Je Ryoo) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.4
The protection method for an arc of the photovoltaic generation system affected by the wire aging and poor contact of electrodes has been required. About a household photovoltaic systems, the series arc fault detection circuit and algorithm has been implemented, and the current transformer (CT) is used to detect the arc current. Although the CT is a useful current sensing device under the low current condition of the household photovoltaic systems, it is difficult to adopt for the medium-size photovoltaic generation system because of the saturation of transformer, wire thickness, and limited winding area. In this paper, the possibility of the sensing method using rogowski coil to detect the series arc fault of the medium-size photovoltaic power plant.