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김선자(S.J.Kim),전윤석(Y.S.Jeon),이승학(S.H.Lee),최규하(G.H.Choe) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
Shorted-turns can have significant effects on a generator and Its performance. Shorted-turn sensor for synchronous generator's field winding have been developed One of effective method detecting inter-turn short circuits on round rotor winding is a method using sensor detecting But the method needs duplicate design of sensor for characteristic change according to types and forms of generator Thus sensing skill without sensor depend on change of electric property in generator For the reason, this paper presents shorted-turns phenomenon and the characteristic analysis of shorted-turns 10 synchronous generator by using 2-D finite element method(FEM)
이석(S. Lee),전윤석(Y.S. Jeon),김흥민(H.M. Kim),목형수(H.S. Mok),김덕근(D.G. Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Recently, the demand of motor for industrial, household machinery is increasing. As switching devices and control technology are progressing, so the use of BLDC Motor is increasing But 3- Phase BLDC Motor generally used has pulsating torque and speed variation in commutation, so the range of it's application is limited high speed application is Especially, to solve these problems, it is necessary to increase phase of Motor, so study of Poly-Phase BLDC Motor is progressing. In this paper, we designd 7-Phase BLDC Motor drive system and MSTC(Minimum Switching Time Controller)
조건부 적분기를 가지는 LQ 제어기를 이용한 3상 PWM 컨버터의 전류제어
김홍성(H.S Kim),전윤석(Y S. Jeon),조영준(Y.J Joe),목형수(H S. Mok),최규하(G.H Choe),김한성(H.S.Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
In this paper, controller for PWM converter considering unsymetrical input voltage is designed and current controller using LQ controller with conditional integrator is proposed. And the proposed current controller is compared with other current controller predictive controller, decoupling PI controller. As simulation results, LQ controller with Conditional Integrator shows the improved performance for DC link voltage regulation through transient test of load variation. And when unsymeritrical input voltage is applied to converter with conventional current controller considering only symetrical input voltage, input current is distorted but it is showed that current controller considering unsymetrical input has robust control characteristics under phase voltage unbalance.
PDFF 제어기법을 이용한 단상 UPS 인버터 전압,전류제어에 관한 연구
오방원(B.W. Oh),이상용(S.Y. Lee),이용균(Y.K. Lee),전윤석(Y.S. Jeon),최규하(G.H. Choe) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
There are many methods in controlling inverter's voltage and currents. most of all, PI control method is a general method. PI control has some merits. But, PI control has zero effect. So, steady-state response errors always exist by the zero effect. For removing the steady-state error, This paper presents the modeling, design and analysis of the double loop feedback control scheme. and computing the value of parameters and applying to the single-phase full bridge inverter for comparison and analysis between the PI control and PDFF control. The system model is employed to examine the dynamics of power circuit and select appropriate feedback variables for stable operation of the closed-loop UPS inverter system. It analyzes and proves the output characteristic of inverter system with the PDFF control.
7상 BLDC 전동기 구동시스템을 위한 새로운 전류제어기에 관한 연구
이석(S.Lee),권형남(H.N.Kwon),전윤석(Y.S.Jeon),목형수(H.S.Mok),김덕근(D.G.Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Recently the needs for Motors are rapidly increasing, and especially, the BLDC Motor has advantage, because it is easy to control, in terms of similar torque and speed with DC Motors and easy to manage. However, 3-Phase BLDC Motor, winch is generally used, has limited usage in high speed, due to pulsation torque occurring commutation and variable speed. To solve this problem, it is necessary to increase invariable, pole number, or the number of slots. However, in terms of low winding inductance, back EMF of 7-Phase BLDC Motor is low in the range of low speed. Therefore, when hysteresis current controller is use, switching frequency is highly increasing.<br/> In this paper, To hold increase of switching frequency at low speed, MSTC(Minimum Switching Time Controller), which keeps minimum on-off time by using DSP F240 and EPLD EPF10K, is analyzed and designed. After all, simulation and experimentation had been done to verify the rationale.
Buck converter 방식을 이용한 Universal Motor 구동시의 전원측 고조파 및 EMI 특성
김흥성(H. S. Kim),전윤석(Y. S. Jeon),조영준(Y. J. Jo),최규하(G. H. Choe) 전력전자학회 1996 전력전자학술대회 논문집 Vol.1996 No.-
In this paper input characteristics of Buck converter to drive small capacity universal motor is analyzed about current harmonics and EMI Which is due to a switching effect. And as a strategy for EMI reduction. filter is designed. As a results it is approved that buck converter is adequate method to reduce low order harmonics.
MOSFET와 IGBT를 이용한 DC/DC 컨버터의 효율 증대
권형남(H.N. Kwon),전윤석(Y.S. Jeon),반한식(H.S. Ban),최규하(G.H Choe),배영찬(J.H. Bae) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Recently, the demand of large capacity SMPS for industrial area is increasing. Full-bridge dc-dc converter with IGBT is most widely used for large capacity SMPS because IGBT has a low-conduction loss and large current capacity.<br/> But most large capacity Full-bridge dc-dc converter using IGBT has low operating frequency because of switching loss at IGBT especially at turn-off by current tail and it's cause of relatively big converter size.<br/> MOSFET has low switching losses has been widely used for high frequency SMPS but it has a problem to apply to large capacity SMPS because it has large conduction resistance causing large on-time losses.<br/> In this paper, for reduction losses at switching device, MOSFET is applied at parallel with IGBT in full-bridge dc/dc converter.