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Dithering기법에 의한 직접 토크 제어 방식의 토크리플 개선에 관한 연구
이홍희(H.H.Lee),김정현(J.H.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper focuses on a simple technique to reduced torque ripple in the direct torque control inverter for PMSM drive. It is actually Impossible to raise the inverter switcing frequency in the conventional system, although the hysterisis bandwidths for the stator flux and torque control are sufficiently diminished, becauses of the sampling interval and the delay in estimating the flux and the torque In order<br/> to overcome the problem, the proposed method<br/> introduces a dithering technique into the conventional system by superposing triangular waves with high frequency and minute amplitude on the torque error. And the programable 3- stage lowpass filter is added instead of pure integrator. simulation results prove the feasibility of proposed strategy compared with conventional method
이홍희(H.H. Lee),이현영(H.Y. Lee) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
The predictive maintenance can help to avoid the serious plant breakdowns and catastrophies. This paper deals with the fault diagnosis of the rotor of the induction motor which is widely used in the plants. In order to detect the broken bar, the Extended Kalman Filter is adopted to estimate the rotor resistance on the base of model- based method. The proposed estimation method is simulated with the aid of Matlab
프로피버스 기반 복수유도전동기의 멀티레이트 추정 및 제어
이홍희(H.H. Lee),김관수(G.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a method for increasing controller performance through multirate state estimation for ac machines at a low velocity. The multirate controller outputs control desired speed at each measurement instant The simulation results show that the performance of multirate velocity estimation and control at low velocity is Improved than single rate one.<br/>
복수전동기 구동 시스템의 성능 향상을 위한 반복학습제어기 설계
이홍희(H.H.Lee),김정희(J.H. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Iterative learning control is an approach to improve the transient response of systems that operate repetitively over a fixed time interval. It is useful for the system where the system output follows the different type input, in case of design or modeling uncertainty. In this paper, we introduce the concept of iterative learning control and then apply the learning control algorithm for multi-motor system for performance improvement<br/>