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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.
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.
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.
마이크로 프로세서를 이용한 축전지의 병렬운전 부하분담률 개선에 관한 연구
반한식(H.S. Ban),이정민(J.M. Lee),목형수(H.S. Mok),최규하(G.H. Choe) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A battery is the device that transforms the chemical energy into the direct-current electrical energy without a mechanical process. Unit cells are connected in series to obtain the required voltage, while being connected in parallel to organize capacity for load current. Because the voltage drop down in one set of battery is faster than in two one, it may result in the low efficiency of power converter with the voltage drop and cause the system shutdown. However, when the system being driven in parallel, a circular-current can be generated. It is shown that, as a result the new batteries are heated by over-charge and over-discharge, and the over charge current increases rust of the positive grid and consequently shortens the lifetime of the new batteries. The difference between the new batteries and old ones is the amount of internal resistance. In this paper, we can detect the unbalance current using the microprocessor and achieve the balance current by adjusting resistance of each set. The internal resistance of each set becomes constant and the current of charge and discharge comes to be balanced by inserting the external resistance into the system and calculating the change of internal resistance.
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.
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/>
양승헌(S.H. Yang),김경현(K.H.Kim),전윤석(Y.S. Jun),목형수(H.S. Mok),최규하(G.H. Choe) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Hydrogen Oxygen gas has obtained from water electrolysis reaction it is mixed gas havingconstant volume ratio 2 1 Hydrogen and Oxygen, and it is used as a source of thermal energy by combustion reaction This gas has betterristics in the field of economy, efficiency of energy, and environmental intimacy than used both of acetylene gas and LPG for gas welding machin So nowdays many studies of Water-Electrolyzed gas are progressed, and commercially used as a source of thermal energy for gas welding ln the industry.<br/> For Water-Electrolyzed Source, it was used diode rectifier or SCR rectifier for get DC source This method which is not looking to improve a source for Impossible current control or voltage and limited control intervals ‘<br/> In mis paper, it was relized and design in source of pulse type for complementing existing DC source type, also by experiment it was acquired producting characteristics of Hydrogen-Oxygen Gas th개ugh feature of source
양승헌(S.H. Yang),김경현(K.H. Kim),강병희(B.H. Kang),목형수(H.S. Mok),최규하(G.H. Choe),이승학(S.H. Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Water-Electrolyzed gas is a mixed gas of the constant volume ratio 2 ' 1 Hydrogen and Oxygen gained from electrolyzed water, and it has better characteristics in the field of economy, efficiency of energy, and environmental intimacy than acetylene gas and LPG used for existing gas welding equipment So studies of Water-Electrolyzed gas are activily in progress nowadays, and commercially used as a source of thermal energy for gas welding in the industry. The object of this paper is V-I feature of Hydrogen -Oxygen Gas Generator using DC source.
반복제어기를 적용한 단상 계통연계형 인버터의 전력품질 개선
김재한(J.H Kim),목형수(H.S Mok),최규하(G.H Choe),이진우(J.W Lee),정교범(G.B Chung),이정민(J.M Lee),조영훈(Y.H Cho) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In recent years, installation of the new and renewable energy system is rapidly increasing. Because the new and renewable energy system is a practical distributed generation system to save energy resources and to keep environments clean. Conventional single-phase utility interactive inverter controls output current by using PI current controller. However, this method is insufficient to suppress harmonic current resulted from nonlinear loads in grid line. In this paper, in order to suppress periodic waveform distortion and improve THD(Total Harmonic Distortion), new type current controller added a parallel repetitive controller is proposed and then performance of the proposed controller was verified with computer simulation.