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한전 실 배전계통 모델을 이용한 1단 장주 중성선 전류 계산
徐熏徹(H. C. Seo),朴乾祐(K. W. Park),金喆煥(C. H. Kim),鄭昌守(C. S. Jung),柳然杓(Y. P. Yoo),林勇勳(Y. H. Lim),?溢鎬(I. H. Seol) 대한전기학회 2007 전기학회논문지 Vol.56 No.1
The one step type and two step type pole are used in distribution line. If the three phases are not balanced, the communication line can be damaged by induced voltage. This paper calculates the neutral current using KEPCO's distribution system model which is only composed by one step type pole. The used system model is modelled by using ATPDraw and the neutral current is calculated by using EMTP/MODELS. Many cases for abstracting the neutral current characteristics in KEPCO's distribution system are simulated and analyzed.
서훈철(H. C. Seo),이상봉(S. B. Rhee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
This paper suggests a decision scheme for optimal insertion resistance in an Superconducting Fault Current Limiter (SFCL) application to reduce the transformer inrush current. This scheme and the SFCL model are implemented using Electromagnetic Transient Program (EMTP). We determine the optimal SFCL resistance by EMTP simulation, and this value is applied to model the SFCL by EMTP. The simulation results show the validity and effectiveness of the suggested scheme and the ability of a SFCL to reduce the inrush current.
Matlab/Simulink를 이용한 계통연계형 태양광발전 모델링
서훈철(H. C. Seo),윤영민(Y. M. Yoon),김선룡(S. R. Kim),이시봉(S. B. Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
This paper introduces the modeling of grid-connected photovoltaic(PV) generation using Matlab/Simulink. The model is based on the equivalent circuit of the PV solar cell including the effects of solar irradiation and temperature changes. The PV arrays are mod리ed to be bulit up with the series/parallel combination of PV solar cell and are connected to the distribution system via an inverter. The simulation results show that the typical characteristics and outputs of the PV arrays are accurate.
서훈철(H. C. Seo),여상민(S. M. Yeo),김철환(C. H. Kim),유영식(Y. S. Lyu),조범섭(B. S. Cho) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
Transformer inrush current can cause the voltage drop by source impedance. The accurate modeling and analysis for inrush current is first step to limit the inrush current and improve the power quality. This paper presents the modeling of transformer inrush current by EMTP-RV using Jeju power system, Korea. The method to model the hysteresis curve of transformer in EMTP-RV is discussed. Simulations demonstrate the verification of modeling of inrush current by comparing the data recorded in field with simulation values and analyzing the harmonics of inrush current.
EMTP를 이용한 Pre-strike 모델링에 관한 연구
여상민(S.M. Yeo),서훈철(H.C. Seo),김철환(C.H. Kim),유영식(Y.S. Lyu),조범섭(B.S. Cho) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
차단기, 단로기와 같은 개폐기는 투입 동작이 이루어질 때, 접점 간의 내전압과 양단간의 전압차사이의 관계에 의하여 pre-strike 현상이 발생한다. 따라서, 개폐기가 투입되는 동안 발생하는 파도현상을 파악하기 위해서는 개폐기의 pre-strike 현상을 모델링하는 것이 중요하다. 본 논문에서는 개폐기의 pre-strike 현상을 EMTP로 모델링하고 이를 모델 계통에 적용하여 구현된 pre-strike 모델이 타당함을 보였다.
한전 배전 계통을 이용한 2단장주의 불평형 부하에 따른 중성선 전류의 영향에 관한 연구
朴乾祐(K. W. Park),徐熏徹(H. C. Seo),金喆煥(C. H. Kim),鄭昌守(C. S. Jung),柳然杓(Y. P. Yoo),林勇勳(Y. H. Lim),李元正(W. J. Lee) 대한전기학회 2007 전기학회논문지 Vol.56 No.3
The one step type pole and two step type pole are used in KEPCO's distribution system. The neutral current increases in three-phase four-wire distribution system due to unbalanced load. Usually, power line and communication line are installed at contiguity by effect of topography in Korea. To this end, the damages such as electrostatic induction, electromagnetic induction and harmonic induction generated by induced voltage and current are occured in power line and communication line. This paper calculates the neutral current in KEPCO's distribution system using EMTP by composing various simulated conditions. Also, these results are verified by vector analysis.