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회전자 자속 기준제어를 위한 유도전동기 회전자 자속추정
정삼용,최연옥,조금배 조선대학교 전자정보통신연구소 2000 電子情報通信硏究所論文誌 Vol.3 No.1
In this paper, authors propose a new nonlinear rotor flux observer for rotor field oriented control of an induction motor which is designed based on theory of the extended Luenberger observer(ELO), one of a nonlinear state observer. The proposed rotor flux observer is derived from the 2 phase model of induction motor by the theory of ELO The simulation results taken under the varying condition of rotor resistance and load torque show fast convergence of estimated rotor flux and high performance of IM drive system is acheived 표 experiment.
정삼용,조금배 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
In this paper, author describe the simulation results concerning the period doubling bifurcation route to chaos of DC/DC boost converter under current mode control to show that it is common phenomena on switching regulator when parameters are improperly chosen or continuously varied beyond the ensured region by system designer. The Bifurcation diagrams of periodic orbits of inductor current and capacitor voltage of DC/DC boost converter are plotted with sampled data at moment of each clock pulse causing switching on. DC/DC boost converter studied on this paper is modelled by its state space equations as per switching condition under continuous conduction mode. Current reference signal and capacitance are chosen as the bifurcation parameters and those are varied in step for iterative calculation to find the bifurcation points of periodic orbits of state variables.
확장된 Luenberger 관측기를 이용한 유도전동기 회전자 자속추정
정삼용(Sam-Young Jeong),최연옥(Youn-Ok Choi),조금배(Geum-Bae Cho),백형래(Hyung-Lae Baek),김동휘(Dong-Hui Kim),서진연(Jin-Yeun Seo),신사현(Sa-Yeun Sin) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, authors propose a new nonlinear rotor flux observer for rotor field oriented control of an induction motor which is designed based on theory of the extended Luenberger observer(ELO), one of a nonlinear state observer. The proposed rotor flux observer is derived from the 2 phase model of induction motor by the theory of ELO. The simulation results taken under the varying condition of rotor resistance and load torque show fast convergence of estimated rotor flux and high performance of 1M drive system is acheived 표 experiment
정삼용(S.Y.Jeong),이진섭(J.S.Lee),서진연(J.Y.Seo),김동휘(D.H.Kim),최연옥(Y.O.Choi),조금배(G.B.Cho) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
Indirect vector control for induction motors requires the use of observers for estimation or observation of rotor flux magnitude and position In this paper, authors describe the induction motor vector control and introduce a nonlinear observer, named ELO(extended Luenberger Observer), without simulation results as a preliminary work for trial application Normally, design of nonlinear observer need coordinate transformation and linearzation through solving the partial different equation However, ELO requires minimal solution of nonlinear partial differential equation Simulation was performed by under the evironment of Matlab and Simulink without the proposed observer because we are still working Simulation was performed with conventional flux observer, a dc-ac inverter modulated by SVPWM technique, a vector controller armed with multiple PI controllers.<br/> <br/>
MATLAB/SIMULINK를 이용한 전동기 가변속 구동시스템 모델링 및 시뮬레이션
정삼용(S.Y Jeong),최연옥(Y.O Choi),한엄용(U.Y Han),오금곤(G.K Oh),정수복(S.B Jung),조금배(G.B Cho) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
The variable speed drive system of a elecric motor is popular in industry due to its economical aspect and simplicity of implementation, comaparing with a steam turbine or the other engine driven. For a large pumping load like a feedwater pump rated about or more than 20,000kW, a synchronous motor could be primarily considered .<br/> In this paper, we studied the modelling of a variable speed drive system consisted with a load commutated inverter(LCI) and a brushless sailent pole rotor synchronous motor(SM) using MATLAB/SIMULINK.<br/> Simulation was performed with a small SM motor parameters.
확장된 루엔버거 관측기를 이용한 유도전동기 회전자 자속 추정
조금배,최연옥,정삼용 전력전자학회 2001 전력전자학회 논문지 Vol.6 No.2
본 논문에서는 유도전동기 회전자 자속 기준제어를 위하여 비선형 관측기인 확장된 루엔버거 관측기 원리를 적용한 새로운 회전자 자속관측기를 제안하였다. 확장된 루엔버거 관측기는 확장된 칼만 필터와 유사하게 동특성 오차의 선형화 기법을 따트고 있으나 통계학적 속성의 노이즈 공분산을 고려하지 않는 결정론적 관측기로서 비선형 상태관측기 설계시 요구되는 좌표변환 및 선형화 파정에서 비선형 편미분 방정식의 직접적인 해를 펼요로 하지 않아 구현이 비교적 용이하다. 제안된 회전자 자속관측기는 직교좌표의 고정자 전류, 회전자 자속, 속도 및 부하 토크로 구성된 6차 미분방정식으로부터 유도되었으며 축약된 형태의 이득행렬을 갖는다. 시뮬레이션 및 실험은 파라 미터중 회전자 저항 값이 변동된 상황을 가정하여 수행하였으며, 시뮬레이션 결과 제안된 관측기를 이용한 자속 추정시 극점 재배치를 통하여 동특성 오차의 수렴성을 제어할 수 있으며, 부하 설험결과 제안된 관측기를 적용하는 경우에는 슬립적분형 간접벡터제어에 비해 보다 정확한 벡터제어가 가능함이 확인되었다. In this paper, authors propose a new nonlinear rotor flux observer for rotor field oriented control of an induction motor which is designed based on the extended Luenberger Observer theory. Extended Luenberger Observer requires minimal solution of nonlinear partial differential equation on its coordinate transformation and linearization needed on a nonlinear observer design in general. The proposed rotor flux observer is derived from the 2 phase model of induction motor on the orthogonal coordination and it has the reduce gain matrix. Simulation and experimentation were performed under the conventional indirect vector control and direct vector control with the proposed observer at different rotor resistance. Simulation results show that the convergence of the proposed observer is influenced by the chosen eigenvalues. Experimentation results on load operation show the direct vector control with the proposed observer is better than the indirect vector control to maintain the characteristics of the vector control.
태양광 발전시스템의 최대전력추적을 위한 DC/DC 컨버터 제어
최연옥,서진연,장용해,정삼용,조금배 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
Solar energy converters were used to convert the electrical energy from the solar arrays to a stable and reliable power source. The object of this paper is to analyze and design DC/DC converters of different types in a solar energy system in order to investigate the performance of the converters. A simple method which combines a discrete time control and a PI compensator is used to track the maximum power point of the solar array. The system is kept to operate close to MPPT's thus the maximum possible power transfer from the solar array is achieved. Experimental tests were carried out for buck, boost and buck-boost converters using a simple maximum power point tracking algorithm.