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윤인식(In-Sic Yoon),서영민(Young-Min Seo),홍순찬(Soon-Chan Hong),윤덕용(Duck-Yong Yoon),한성수(Sung-Soo Han) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper deal with the power factor improvement of DC power regenerating systems, which are composed of two inverters, zig-zag connected output transformers, and an AC filter. The output voltages of the inverter system are not sinusoidal. Regenerated complex power is analyzed on the basis of fundamental components and therefore the reactive power produced by harmonics is not considered. Therefore, it is needed a new control scheme capable of controlling the reactive power nearly to zero for nonsinusoidal case. Computer simulations are carried out to verify the validity of the prososed control scheme.
MRAS를 이용한 유도전동기의 파라미터 온라인 추정에 관한 연구
윤인식(In-Sic Yoon),변성훈(Sung-Hoon Byun),김경서(Kyung-Seo Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents a method for on-line estimation of rotor time constant of induction motor The proposed method applies a model reference adaptive system(MRAS) using rotor flux vector. The MRAS consists of two independent observers to estimate the rotor flux vector; one based on voltage equations of rotor flux vector, the other based on current equations of them The MRAS utilizes concept of auxiliary variables to norma1ize observer output and decrease high-frequency components of Its input. Experimental results verify the validity and usefulness of proposed method
김명수(Myeong-Soo Kim),윤인식(In-Sic Yoon),박영진(Young-Jeen Park),윤덕용(Duck-Yong Yoon),홍순찬(Soon-Chan Hong) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
This paper deals with the harmonic reduction technique in square-wave Inverters which can regenerate the dc power from dc bus line to ac bus line in substations for traction systems. To reduce the harmonics, two 6-pulse Inverters are used for 12-pulse operation and zigzag-connected output transformers for eliminating the harmonics of 6(2m-l)±1 orders. And an ac filter is furnished at output side. In spite of the square-wave three-phase Inverters, computer simulations show that the This of the output voltage and current are 2.55% and 0.554%, respectively
α도통모드에 의한 직류전력회생용 인버터 출력전압의 크기 제어
서영민(Young-Min Seo),이주훈(Ju-Hoon Lee),김경원(Kyung-Won Kim),윤인식(In-Sic Yoon),유종걸(Jong-Gul Yoo),윤덕용(Duck-Yong Yoon),홍순찬(Soon-Chan Hong) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper deals with the voltage amplitude control In Inverter systems which can regenerate the excessive DC power from DC bus line to AC supply In substations for traction systems To maintain the magnitude of output fundamental voltage constant in spite of the variation of input DC voltage, inverters are operated in symmetrical α- conduction mode with the range of 120˚< α < 180˚. To match the output voltage of the inverter systems with AC supply voltage, harmonic reduction techniques are also Investigated Computer simulations are carried out to verify the validity of the proposed system.