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플라잉 커패시터 멀티-레벨 인버터의 플라잉 커패시터 전압 균형을 위한 캐리어 로테이션 기법
이원교(W.K. Lee),강대욱(D.W. Kang),김태진(T.J. Kim),현동석(D.S. Hyun) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper proposes a Carrier- Rotation PWM technique that is new solution for the voltage unbalancing problem of flying capacitors in the Flying Capacitor Multi-level Inverter (FCMI) The proposed PWM technique equalizes the utilization of phase leg voltage redundancies corresponding to the charging and the discharging state of flying capacitors during one switching period of all the switches. it also has the same switch utilization and the reduced harmonics of output voltage Hence, it is more suitable for the FCMI compared with the conventional solutions. Experimental results on the laboratory prototype flying capacitor 3-level Inverter confirm the validity of the proposed PWM technique
플라잉 커패시터 멀티-레벨 인버터의 커패시터 전압 균형을 이루기 위한 캐리어 비교방식을 이용한 캐리어 대칭 기법
전재현(J.H. Jeon),김태진(T.J. Kim),강대욱(D.W. Kang),현동석(D.S. Hyun) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a simple carrier symmetric method for the voltage balance of flying capacitors in FCMLI(flying capacitor multi-level inverter). To achieve the voltage balance of flying capacitors, the utilization of each carrier must be balanced during a half-cycle of the switching period such as PSPWM(Phase-Shifted PWM) However, the CRPWM(Carrier Redistribution PWM) method causes the fluctuation of flying capacitor voltages because the balanced utilization of carriers is not achieved. Moreover, it does not consider that the load current change has an influence on flying capacitor voltages by assuming that the current flows into the load. To overcome the drawbacks of CRPWM, It is modified by the technique that carriers of each band are disposed symmetrically at every fundamental period. Firstly, the CRPWM method is reviewed and the theory on voltage balance of flying capacitors is analyzed. The proposed method is introduced and is verified through the experiment result.<br/>
스텝 펄스파를 사용하는 캐스케이드 인버터에서 스위치의 간단한 도통각 계산법
김형창(H.C. Kim),김태진(T.J. Kim),강대욱(D.W. Kang),현동석(D.S. Hyun) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
In recent years, the multilevel inverter synthesizing the output voltage with step pulse has been widely used as a solution for high power and high voltage applications, Tills paper proposes a simple method to obtain the conducting angle It is calculated by using voltage-second areas of the divided reference voltage according to the output voltage levels and these areas have influence on output step pulse waves It is possible to reduce an amount of calculation because it is not required to solve the simultaneous equations by an Iterative method Also, the proposed method can get the conducting angle by means of on line,<br/>
OWC 파력발전용 250㎾ 권선형유도발전기 제어용 전력변환장치 개발
박정우(J.W.Park),강대욱(D.W.Kang),김상호(S.H.Kim),신승호(S.H.Shin),홍기용(K.Y.Hong) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.11
본 논문은 250㎾ 권선형유도발전기를 가지는 파력발전시스템을 제어하기 위한 전력변환장치 개발에 대한 것으로, 시제품에 적용된 권선형유도발전기 제어방법과 전력변환장치를 소개하고, 다양한 실험으로부터 얻은 결과를 제시함으로써 파력발전 시스템에 직접 적용하여 실증실험을 수행할 만큼 준비가 되어 있음을 보이고자 한다. The present paper is aimed to introduce the results for the development of electrical power converter applied in the wave power plant with doubly-fed induction generator. Through many experiments the prototype converter has been proven to be a good enough performance to be applied to the field test.
Neutral-Point-Clamped 인버터의 저 변조지수에서 DC 링크 전압 균형을 위한 간단한 컨트롤 기법
마창수(C.S. Ma),김태진(T.J. Kim),강대욱(D.W. Kang),현동석(D.S. Hyun) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper proposes a simple control strategy based on the discontinuous PWM(DPWM) to balance the DC-link voltage of three-level Neutral-Point-Clamped(NPC) inverters at low modulation index New DPWM methods in multi-level inverter are also introduced. The proposed DPWM method changes the path and duration to flow the neutral point current out of or into neutral point of the DC-link and it makes the overall fluctuation of the DC-link voltage zero during a sampling time of reference voltage vector Therefore, the voltage of the DC-link can be balanced fairly well and also the voltage ripple of the DC-link is reduced significantly Moreover, comparing with conventional methods, the proposed strategy is very simple. The validity of the proposed DPWM method is verified by experiment<br/>