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충방전 제어기를 이용한 독립형 태양광 발전시스템의 설계
김홍성(H.S.Kim),유권종(G.J.Yu),송진수(J.S.Song),이병구(B.K.Lee),정영석(Y.S.Jeong),강기환(K.H.Kang),최규하(G.H.Choe) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper deals with stand-alone Photovoltaic system(SPVS) with charge and discharge controller Main power source of SPVS are generally solar cell and battery. Therefore SPVS can be classified into variable types in accordance with connection type between battery and solar cell. Mainly used one of them is direct connection type which has advantages such as simple structure and simple controller However most big drawback of this system is energy loss by voltage disharmony between solar cell and battery. Therefore SPVS with charge and discharge controller which can operate solar cell at maximum power point is designed and ,analyzed by simulation in this paper.<br/> <br/>
3상 직렬형 능동필터의 입력전압변동에 대한 전향보상이득에 관한 연구
권형남(H.N. Kwon),남종하(J.H. Nam),강병희(B.H. Kang),최규하(G.H. Choe),한석우(S.W. Han) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
Recently, as the development of industry, the nonlinear load becomes increased. Because of nonlinear load, the variation of source voltage is generated by the impedance of source side flowed harmonic currents. For blocking harmonic currents by nonlinear load, a series active power filter operates blocking resistance of harmonic currents. The value of blocking resistance shows ideal compensating characteristic out of theoretically infinite value. But the blocking resistance is limited by the problem of the system stability and the capacity of inverter. In tins paper, the value of optimum blocking resistance is found by a simulation in the applied system. In the case of unbalanced source voltages, each relation of the blocking resistance is shown. It is proved that blocking resistance of series active power filter relates to a passive filter.<br/> <br/>
최룡해(H.R. Choi),강병희(B.H. Rang),목형수(H.S. Mok),최규하(G.H. Choe),신우석(W.S. Shin) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
Started upon Its discovery by Wright et al in 1973, studies on the solid polymer electrolyte are being carried out vigorously. So. models of Ll-polymer battery have been developed through R-L-C components combination and P-splce functional block in this paper. The Impedance characteristics of Li-polymer battery with R-L-C components are presented. Simulation results using P-spice functional model are compared with measured charge/discharge characteristics.
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.
최해룡(H.R. Choi),이정민(J.M. Lee),고재석(J.S. Gho),유재현(J.H. Yoo),이승학(S.H. Lee),최규하(G.H. Choe) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper proposes the virtual implementation of solar cell(VISC) for photovoltaic system, It is required to make operation condition of solar cell arrays where is the limit of time and space<br/> The main advantage of the simulator is its ability to simulate different types and sizes of arrays considering V-I characteristics of data sheet. The VISC with buck-boost converter can be used to study the short-term and long-term performances of PV cells, The simulator is a far more cost effective and reliable replacement for field and ,flight testing.
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.
김홍민(H.M.Kim),이정민(J.M.Lee),강병희(B.H.Kang),목형수(H.S.Mok),최규하(G.H.Choe),김태훈(T.H.Kim),김종규(J.G.Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
Recent trends in sonar design have mostly required increasing power output of sonar transducer in the 'acoustics. This paper presents the power amplifier and the band pass filter for sonar system which includes sonar transducers and matching network In order to prove the validity, simulation is carried out using Pspice and Matlab.<br/> Instead of using the linear amplifier method which have several the disadvantages in driving transducer, the phase control method is applied to the power amplifier. The band pass filter is required to reduce the harmonics (ie 3rd, 5th. 7th) for the phase control method.
AFD방식을 이용한 단상 계통연계형 PV시스템의 단독운전시 계통주파수 변동 특성 해석
허혜성(H.S. Heo),김홍성(H.S. Kim),김한구(H.G. Kim),최규하(G.H. Choe),최영호(Y.H. Choi),김재철(J.C. Kim) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
To detect islanding mode when the grid is being tripped is a major safety issue in utility interactive PV(UIPV) system. And one of the widely used techniques to detect islanding mode are Reactive power variation (RPV)method and Active frequency drift (AFD)method. In this paper, analytical design method is suggested for AFD method under IEEE recommended islanding test condition. And in order to show the validity of proposed method, EMPT based simulation was done for UIPV system with AFD method. Results shows proposed method is very useful.
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.