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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.
Voltage Sag 보상을 위한 승압형 단상 인버터 시스템에 관한 연구
서영민(Young-Min Seo),이승용(Seung-Yong Lee),홍순찬(Soon-Chan Hong) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.11
This paper proposes a boost type single-phase inverter system to compensate the voltage sag appeared on source side. The proposed system is composed of a boost converter, a PWM inverter, and a bypass diode. If the voltage sag has appeared in input voltage, the boost converter would be operated to compensate it in the proposed system. The boost converter would not be operated when the magnitude of input voltage is more than 0.9 pu. The output voltage is kept constant by a direct-quadrature frame controller in the inverter. A 300 W class boost type inverter system was simulated, and the validity of the proposed system was verified by carrying out experiments.
입력전압의 순시전압강하 보상을 위한 승압형 인버터 시스템
이승용(Seung-Yong Lee),서영민(Young-Min Seo),구도연(Do-Youn Koo),김동욱(Dong-Wook Kim),홍순찬(Soon-Chan Hong) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
In this paper, we propose a boost type inverter system for the compensation of instantaneous voltage sag. The system compensate instantaneous voltage sag which magnitude is higher than 10[%] of normal input voltage. When input voltage is higher than 90[%] of normal value, the switch in boost converter is not operated and output voltage is controlled by modulation amplitude in PWM inverter.
Voltage Sag 보상을 위한 종속 승압형 인버터 시스템
이승용(Seung-Yong Lee),서영민(Young-Min Seo),김명수(Myeong-Soo Kim),홍순찬(Soon-Chan Hong) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
This paper proposes a cascaded boost type inverter system to compensate the voltage sag. If the voltage sag has appeared in input voltage, a cascaded boost converter would be operated to compensate voltage sag. The output voltage is kept constant by a direct-quadrature frame controller in the single-phase PWM inverter. The validity of proposed system is verified by simulation on the 300W cascaded boost type inverter system.
채수용(Soo-Yong Chae),서영민(Young-Min Seo),정대택(Dae-Taek Chung),윤덕용(Duck-Yong Yoon),홍순찬(Soon-Chan Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper proposes a DC-DC converter which is able to charge and discharge secondary batteries. The converter operates as a double-ended forward converter in charging process and as electrical isolated boost converter in discharging process. The converter is designed for continuous current operation. The switching frequency is selected as 100㎑ to reduce the size of both the inductor and the capacitor.
SVPWM을 이용한 직류전력 회생시스템의 역률개선에 관한 연구
고영민(Young-Min Ko),채수용(Soo-Yong Chae),서영민(Young-Min Seo),정대택(Dae-Taek Jeong),배영욱(Young-Wook Bae),홍순찬(Soon-Chan Hong) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In the substations for traction systems and the large-scale discharging system of secondary batteries, the voltage of DC bus line goes up by the regenerated energy and the energy is usually wasted in resistor for system stability. This paper proposes the DC power regenerating system using a three phase PWM inverter. The proposed system can regenerate the excessive DC power from DC bus line to AC supply and control the power factor of AC supply to unity. To implement unity power factor, the magnitude of the inverter output voltage should be higher than that of AC supply and therefore SVPWM technique is adopted. Computer simulations are carried out to verify the validity of the proposed system.