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전자기 과도현상 해석과 고조파 평가를 위한 S영역 주파수 의존 등가시스템 개발
왕용필(Y. P. Wang),정형환(H. H. Chong),이준탁(J. T. Lee),한형주(H. H. Han),김해재(H. J. Kim),정동일(D. I. Chong),곽노홍(N. H. Kwak) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The recent power systems are very complex and to model them completely is impractical for analysis of electromagnetic transient. Therefore areas outside the immediate area of interest must be represented by some form of Frequency Dependent Network Equivalent (FDNE). In this paper a method for developing Frequency Dependent Network Equivalent (FDNE) using S-domain rational Function Fitting is presented and demonstrated. The FDNE is generated by Linearized Least Squares Fitting(LSF) of the frequency response of a S-domain formulation. This Three-port FDNE have been applied to the test AC power system. The electromagnetic transient package PSCAD/EMTDC is used to assess the transient response of the Three-port FDNE developed under different condition. The study results have indicated the robustness and accuracy of Three-port FDNE for analisys of electromagnetic transient and harmonic assessment.
왕용필(Y. P. Wang),정형환(H. H. Chong),한형주(H. H. Han),곽노홍(N. H. Kwak),전영수(Y. S. Jeon),박상호(S. H. Park),김경철(K. C. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Recently, due to increasing the application of power electronic equipment, harmonics generated from the non-liner load are fairly produced. Harmonics can cause a variety of problems such as the overheating of distribution transformer, the breakdown of device and communication interference. Interest about power quality decline of power system is very increased. In this paper, we are measured the harmonic voltage and current of power system to analyze harmonic characteristics, and it is analyzed Total Harmonic Distortion(THD). Also, we are modeled power system using PSCAD/EMTDC. And it is analyzed harmonic voltage and current in steady-state. The study results have been indicated the utility about harmonics analysis and modelling for power system.
왕용필(Y. P. Wang),정형환(H. H. Chong),정종원(J. W. Chong),한형주(H. H. Han),곽노홍(N. H. Kwak),전영수(Y. S. Jeon),박상호(S. H. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The design of a measurement system to perform Harmonic State Estimation (HSE) is a very complex problem. In particular, the number of harmonic instruments available is always limited. Therefore, a systematic procedure is needed to design the optimal placement of measurement points. This paper presents a new HSE algorithm which is based on an optimal placement of measurement points using Intelligent Algorithms (IAs). This HSE has been applied to the Simulation Test Power System for the validation of the new HSE algorithm. The study results have indicated an economical and effective method for optimal placement of measurement points using Intelligent Algorithms (IAs) in the Harmonic State Estimation (HSE).
다이오드레이저를 이용한 디스플레이 모듈 내 이방성 전도 필름(ACF) 접합 기술에 관한 연구
류광현(K. H. Ryu),서명희(M. H. Seo),남기중(G. J. Nam),곽노홍(N. H. Kwak) 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.3
A bonding process between tape-carrier package and a glass panel with anisotropic conductive film (ACF) has been investigated by making use of high power diode laser as a heat source for cure. The results from modeling of process and from optical properties of layers showed that heat absorbed from polyimide film surface and ACF layer is dominant source of curing during laser illumination. Laser ACF bonding has better bonding quality than conventional bonding in view of peel strength, flatness, pressure unbalance and processing time. New ACF bonding processes by making use of high power diode laser are proposed.
A Study on the Application of the DVR System using EMTDC Simulation
최영도(Y. D. Choy),곽노홍(N. H. Kwak),전영수(Y. S. Jeon),전동훈(D. H. Jeon) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Recently, the interest on power quality has been hot issue because the equipments cause voltage disturbance and become more sensitive to the voltage disturbance. The DVR(Dynamic Voltage Restorer) is one of the Custom Power Device that can compensate the voltage. DVR operates as a series connected compensator whose output voltage can be controlled system voltage. And the magnitude of compensation voltage is limited by the characteristics of system and load. Compensation capability of DVR was simulated by EMTDC under several condition. This paper analyzed effect of DVR's compensation at power quality test center which has SSFG(Sag, swell, and Flicker Generator, CPDs(SSTS, DVR, DSTATCOM), and loads.