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이지명(G-Myoung Lee),이동춘(Dong-Choon Lee),임대식(Dae-Sik Lim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this abstract, a novel control scheme of voltage-source PWM rectifiers using only dc-side sensors is proposed. The phase currents are reconstructed from switching states of the rectifier and the dc output current. For effective current control, the current and the magnitude of the source voltage are estimated by phase estimator and magnitude estimator, respectively. The validity of the proposed ac sensorless technique is verified by experimental results.
직렬형 능동필터와 수동형 병렬필터를 이용한 전원불평형 및 고조파 전류 보상
이지명(G-Myoung Lee),이동춘(Dong-Choon Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
A novel control scheme compensating for source voltage unbalance and harmonic current for series active power filters is proposed, where the references for voltage unbalance and current harmonic and phase angle is derived from the positive sequence component of the source voltage obtained simply through digital all-pass filters, which makes the whole control algorithm simpler than other methods using p-q theory. In addition, the harmonic component of source current is compensated by harmonic component of load voltage and therefore fundamental component of source current is considered as separated terms for the control issue. The validity of the proposed scheme has been verified by experimental results.
이지명,이기도,이동춘 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1
For electric machine drive systems, the conventional PI controller usually suffers a windup in transients since the actuator is saturated. To eliminate the windup, anti-windup strategies are proposed and analyzed. Anti-Windup of both speed and current controllers for induction motor drives is considered. The validity of the anti-windup strategy applied to induction motor drives is confirmed by various simulation results.