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3次元 空間 電流座標에 의한 電力分析과 能動電力필터의 性能評價用 시뮬레이터 開發
나석환,최찬학,정영국,정화균 여수대학교 1993 論文集 Vol.7 No.-
The definition of traditional 2-DS power factor current and co-ordinate did not represent clearly relation to power facter in circuit with nonlinear thyristor loads. A new simulator for performance evaluation of Active Power Filter (APF) by 3-D space current co-ordinate applicale to general power system have not been developed, because reserchers were merely interested in improvement of source current waveforms by using APF or its simulator. Moreover, There was not APF simulator with power analysis capability which was developed for the better. Current was decomposed by active, reactive, distortion, by digital correlation signal proccessing techique based on Nowomiejski theory. Therefore, A new 3-D space current co-ordinate composited by 3 current components was defined in this paper. A new 3-D space current co-ordinate was shown state and location of current vector by trajectories with 3-D co-ordinate rotation. It evidently has excellent performance not only performsance evaluation method of APF but alse evaluation method of general power system, not conventional domain but other domain. By proposed 3-D soace co-ordinate, space power factor is derived, the true state of physical meaning is proved, new distortion factor was proposed, this study was proved true state of appropriation throughout development of simulator for APF performance evaluation with power analysis capability.
무손실 저항개념을 이용한 저전력 전원설비용 능동 역률보정기의 설계
임영철,정영국,최찬학,나석환,이건식,장영학 한국조명전기설비학회 1993 조명.전기설비 Vol.7 No.1
본 연구는 정류기의 입력전류에 포함되어 있는 고조파성분을 제거하고 입력역률을 개선하기 위해 무손실 저항(Loss Free Resistor) 개념에 기본을 둔, PC, 가전기기 및 형광등용 전자안정기등과 같은 저전력 전원설비에 적합한 불연속 도통모드(DCM) 플라이백 방식의 능동역률 보정기의 등가회로모델 및 설계법을 제시하였다. 이 개념에 의하여 능동역률 보정기의 등가입력저항, 출력전력원 특성을 정확하게 나타낼 수 있었으며 또 설계방정식을 유도하여 능동역률 보정기를 설계 시험한 결과, 적은 부품으로 정류기의 입력교류 전류에 포함되어 있는 고주파를 제거하였고 따라서 0.98의 고입력역률의 정류를 할 수 있었다. A simple discontinuous conduction mode(DCM) flyback type active power factor corrector for low power supply resents an effective resistive load to its power input. It is therefore well suited as an inexpensive high power factor rectifier for office equipment. An equivalent circuit model for the Active Power Factor Corrector based on the "Loss Free Resistor" concept is presented. This simple model correctly describes the basic power processing properties of the Active Power Factor Corrector, including input port resistor emulation, output port power some characteristics.teristics.
임영철,김광헌,최찬학,나석환,정영국,장영학,장학충 한국조명전기설비학회 1995 조명.전기설비 Vol.9 No.5
Single-phase induction motors are widely used in many light duty applications, especially in home and office. many applications which use these motors require adjustable speed control continuously. In general, the speed control of single-phase induction motor is accomplished at a few discrete speeds by using tapped-windings, pole switching or gear. These techniques are inefficient and complicated. In this paper, Torque controller which adjusts a generating torque using phase difference between main winding voltage and auxiliary winding voltage is proposed. The analysis includes the determination of the relationship between the auxiliary winding voltage is proposed. The analysis includes the determination of the relationship between the auxiliary winding voltage phase angle and torque. Simulation results of the torque-speed characteristics using the controlled auxiliary winding supply are shown and discussed. and the drive is tested experimentally to verify the results of the theory by using a dynamometer.
벡터제어를 이용한 표면형 영구자석 동기전동기의 최대효율제어
이진,김의선,홍형표,최찬학 木浦大學校 工業技術硏究所 1992 工業技術硏究誌 Vol.2 No.-
In general, surface type permenent magent synchronous motor is controlled by the i_d=0 control method for producing maximum torque per ampere below the rated speed. And it is controlled by the field-weakening control method in order to expand the operating speed limits. However, these control methods do not consider the efficiency. So it is required to minimize the loss. This paper proposes a maximum efficiency control algorithm for surface type permanent magnet synchronous motors. The proposed maximum efficiency algorithm is derived from minimizing the core loss and copper loss. In this method the optimum d-axis current is supplied by the vector controller which solves the maximum efficiency control algorithm. From the computer simulation and experimental results. the improvement of the efficiency with the proposed control system was confirmed.