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3상 PWM Converter를 위한 정지 좌표계법 Analog 제어기 설계 및 시뮬레이션
이영국(Young-kook Lee),노철원(Chul-won Noh),최종률(Song-yul Choe) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
Due to several advantages of pulse width Modulated(PWM) Converter, such as unity power factor with low-harmonics and energy regeneration, PWM convener has been widely used in industrial application<br/> In every application of energy conversion equipment, the design and Implementation must be carried out considering performance and cost High quality with low cost is me best choice for energy conversion equipment<br/> High dc link voltage can reduce Inverter and motor side losses and system dimension compare to low dc link voltage-Analog controller can make PWM converter cheaper without considerable degradation of the performance than digital Controller. This paper shows the simplified analog controller for 600V dc link voltage using stationary reference frame control and the simulation results
개선된 고정자 자속 추정을 통한 유도전동기의 속도센서리스 벡터제어
신명호(Myoung-Ho Shin),현동석(Dong-Seok Hyun),조순봉(Soon-Bong Cho),최종률(Song-Yul Choe) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a programmable low pass filter(LPF) to estimate stator flux for speed sensorless stator flux orientation control of induction motors. The programmable LPF is developed to solve the de drift problem associated with a pure integrator and an analog LPF with fixed pole. The pole of the programmable LPF is located far from the origin in order to decrease the time constant as speed increases. The programmable LPF has the phase and the magnitude compensator to exactly estimate stator flux in a wide speed range. So, the drift problem is much improved and the stator flux is exactly estimated in the wide speed range. The validity of the proposed programmable LPF is verified by speed sensorless vector control of a 2.21[㎾] three-phase induction motor.<br/> <br/>
관측자를 이용한 영구자석형 동기모터의 저속영역 속도리플 개선
김정태(Chung-tae Kim),노철원(Chul-won Noh),최종률(Song-yul Choe) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
Generally, we often use a speed sensor based on a rotary encoder and we can obtain a speed information by counting the increased or decreased number of encoder pulses in a sampling period. However, these speed measurement systems do not inherently produce a true, instanta-neous speed information and then, the speed ripple is generated by speed measurement errors.<br/> In order to overcome this problem, speed observer is used for the accurate speed measurement and Improvement of speed ripple for Permancnt Magnet Synchronous Motor (PMSM) in this paper. Speed observer estimates the instantaneous speed at each sampling instant. Tills estimated speed signal is then used as the speed feedback signal for the speed loop control. The proposed speed observer system is proved by simulation using SABER simulation S/W.