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고조파 발생을 위한 5[KVA]급 AC Power Source 개발
최문규(M. G. Choi),유재근(J. G. Yoo),이상익(S. I. Lee),전정채(J. C. Jeong),최규하(G. H. Choe),목형수(H. S. Mok) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Recently the harmonic generation has declined electricity quality and has bad influence on the electrical installation including OA(Office Automation), FA(Factory Automation), IT(Information Telecommuni -cation) devices and so on. The study of harmonics be greatly interested in diagnosis accident with harmonics was not merely guesswork but clarify the cause by experimental data at these days. Therefore, it is necessary development of AC power source for correct experiment with reliable data. In this paper, we realized the AC power source that can produce and compose harmonics for analysis of accident with harmonics.
공간전압벡터 PWM을 이용한 7상 영구자석형 동기전동기의 구동 시스템
김한구(H.G. Kim),최문규(M.G. Choi),정병환(B.H. Jeong),목형수(H.S. Mok),최규하(G.H. Choe) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
The motor research of pre-existing attaches importance about one and three motor of reduce torque ripple and speed control. 3-Phase PMSM Motor, which is generally used, has limited usage in high speed, due to pulsation torque and variable speed. To solve this problem, it is necessary to increase invariable, pole number or the number of slots. In this paper 7-Phase PMSM Motor of Steady state analysis of Torque and Output Voltage characteristic. 7-Phase modulation method with Space Voltage Vector is studied for ideal operation of controller.
차단기류의 오동작 해석을 위한 전원왜형장치 설계 및 개발의 연구
최문규(M. G. Choi),유재근(J. G. Yoo),이상익(S. I. Lee),최규하(G. H. Choe),목형수(H. S. Mok) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Up to recently the harmonic generation has deteriorated the quality of electricity and affected the performance on the electrical installation including OA, FA, IT devices and so on. Some studies of harmonic affects in diagnosis and the cause of accident has not done by the experimental data of harmonic source but merely by presumption according to qualitative analysis. So, in order to research the harmonic affect on the electrical installation according to quantitative analysis and gather reliable data over and over again, it is necessary to develop an AC power source which is capable of generating some harmonics. In this paper, we described about realization of Distorted Source devices which can produce and compose harmonics for the analysis of accident due to harmonics.
태양전지의 V-I특성 구현을 위한 PWM컨버터의 해석 및 제어
류태규(T.G Ryu),유재현(J.H Yoo),한정만(J.M Han),고재석(J.S Gho),최규하(G.H Choe) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, the virtual implement of solar cell was proposed to solve the problems as reappearance and repetition of some situation in experiment of photovoltaic. To realize the VISC, mathematical model of solar cell for driving converter was studied and the buck converter were compared in viewpoint of tracking error of characteristic curve of solar cell using computer simulation.
최연규(Y.K.Choe),이승요(S.Y.Lee),최규하(G.H.Choe),목형수(H.S.Mok),함형원(H.W.Ham) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
Unbalanced source voltages due to unbalanced loads in the 3-phase power system is decomposed into positive, negative and zero sequence components. Also, assuming there is no neutural path in the system, the zero sequence component is not shown. Therefore, it is possible to compensate unbalanced source voltage by canceling the negative sequence component of the voltages of the source. In this paper, an algorithm compensating unbalanced source voltages by canceling the negative sequence component is presented and analysis of instantaneous voltage compensator using 3-Phase PWM inverter is carried out through computer simulation.
한석우(S.W. Han),최규하(G.H. Choe),장도현(D.H. Jang),신우석(W.S. Shin),김훙근(H.G. Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Voltage harmonics resulting from current harmonies produced by the nonlinear loads have become a serious problem, in many systems. Moreover momentary interruptions and voltage sags are responsible for many of the power quality problems found in typical industrial plants In this paper, proposed power quality compensate system using photovoltaic system is not only for harmonic compensation but also for harmonic isolation between supply and load, and for voltage regulation and unbalance compensation. Through computer simulations, we have verified the effectiveness of the proposed system.
최해용(H.R. Choi),최규하(G.H. Choe) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
In this paper, control & design of AFPM Motor for Electric Vehicle is presented. Axial Flux Permanent Magnet Motors without Core are designed by numerical approach which is based on mechanical concept. This procedure consists of two parts. one is rotor magnet, the other is stator coil. And to evaluate the performance of target motor, various points like as BEMF and output characteristics are considered in this paper. Also simulation results & Experiments are provided to prove the novel motor design.<br/>
계통연계형 인버터의 왜곡된 계통전압에 의해 발생하는 전류고조파 저감방법
목형수(H.S. Mok),최규하(G.H. Choe),이정민(J. M. Lee),김상훈(S. H. Kim),지준근(J.K. Ji) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
Phase angle in grid-connected inverter is important information for current control. When different loads are connected to PCC(Point of Common Coupling) of grid, distorted grid voltage is taken place by load utility generating distorted current. Especially, in case the grid voltage is distorted by low order frequency such as 3<SUP>rd</SUP>, 5<SUP>th</SUP> harmonic, phase angle of PLL output is distorted. This paper analyze problem of current THD(Total Harmonic Distortion) due to distorted phase angle by distorted grid voltage, and propose control method compensating this problem. Also, it’s validity is verified by simulation and experiment.