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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.
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.