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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.
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)
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.
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.
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.
Motor Drive 설계를 위한 Spice 용 Interface Tool 제작
이상용(S.Y Lee),고재석(J.S. Gho),목형수(H.S.Mok),최규하(G.H.Choe),최홍순(H.S.Choi),김덕근(D.G.Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
The parameter through the motor designing program is used to predict motor response and design the motor drive circuits. The application programs such as "Spice'' and "Saber" are often used for these However, making the electrical model of motor for these simulation tool is uncomfortable and impossible for general users. Therefore, in this paper, we develop the "Spice" library generation program with the motor designing program "Motor Expert". This program will assist the user to make the motor library comfortablely and correctly
인버터 아크용접기를 위한 3상 승압/강압형 컨버터의 운전특성비교
최해룡(H.R. Choi),구영모(Y.M. Goo),채영민(Y.M. Chae),최규하(G.H. Choe),목형수(H.S. Mok),김규식(K.S. Kim),원충연(C.Y. Won) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
Three phase Boost/Buck converter which have economical merits and simple control scheme, are analyzed and evaluated through comparative methods and digital simulation for equivalent load Those play a part of voltage boost/buck as well as power factor correction with single switch. Controller operating in constant and variable frequency is used for rapid output response and stable system condition respectively Moreover low THD property of single switched converter is available for inverter arc welding machine known as high power and low power factor. So in this paper a comparison of the characteristics in boost and buck converter is described and then simulation results conforms the merits from the point of view of power factor and voltage regulator.<br/> <br/>
이상용(S.Y. Lee),강병희(B.H. Kang),채영민(Y.M. Chae),목형수(H.S. Mok),초규하(G.H. Choe),김덕근(D.K. Kim),류재성(J.S. Ryu) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A brushless DC motor has the high quality of torque output and silence, has been more widely used in industrial area. As the driver and controller of BLDC motor have been more complicated and precise, simulation method has been much used m motor design. And the output characteristics of BLDC motor is determined by the waveform of BACK-EMF in instinct. But because the conventional model of BLDC motor is obtained by approximation of real nonlinear waveform to ideal trapezoidal waveform, the error is occurred in slmulation result. Thus in this paper, for the correction of this error in simulation, the model of real nonlinear waveform considered is proposed, and the simulation result is obtained in case of three-phase, four-poles Y-connected, surface mounted permanent magnet BLDC motor.
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.
불평형 전원시스템을 고려한 3상 능동전력 필터에 관한 연구
이승요(S.Y.Lee),조준석(J.S.Cho),최규하(G.H.Choe),목형수(H.S.Mok),박영길(Y.K.Park),신우석(W.S.Shin) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
An important assumption for the active power filter design using instantaneous power theory and the d-q transformation method in a 3-phase power system is based on balanced 3-phase system. However, under pratical conditions, the 3-phase power system can not be continuously balanced due to unbalanced loading. In this paper, a method to control the 3-phase active power filer using instantaneous power theory and the d-q transformation under unbalanced power system is presented and the theoretical results are verified by simulated results.