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단상 인버터의 동작에 의한 이중접속 3상 전압원 인버터의 출력파형 개선
양승욱(Seunguk Yang),최세완(Sewan Choi),김기용(Kiyong Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper proposes a new double-connected 3-phase voltage source inverter with Improved output voltage waveform An auxiliary single-phase inverter injects a ripple voltage into the double- connected inverter to convert 12-step operation to 36-step operation. The KVA rating of the output phase-shifting transformer is reduced by employing a harmonic canceling reactor The whole rectifier-inverter system including the proposed technique is introduced, and the experimental results are provided.
양승욱(Seunguk Yang),최세완(Sewan Choi) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A new capacitor-input type voltage source rectifier is proposed in this paper. The proposed rectifier is based upon 6-pulse diode rectifier with the addition of an auxiliary circuit. By proper operation of the switches of the auxiliary circuit, the input voltage waveform has I8-pulse characteristics and the input current becomes almost sinusoidal due to input ac reactors, The operating principle along with current analysis and input voltage waveform synthesis is described The experimental results from a laboratory prototype verify the proposed concept
중ㆍ소용량 모터드라이브 적용을 위한 새로운 이중접속방식의 멀티스텝 인버터
양승욱(Seunguk Yang),목형수(Hyungsoo Mok),최규하(Gyuha Choe),최세완(Sewan Choi) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 전압원 인버터의 출력전압 파형을 개선하여 중?대용량급 모터드라이버 및 UPS, STATCOM, SVC등에 적용하기 위한 새로운 3상 전압원 인버터를 제안한다. 보조회로로서 사용한 컨버터로 리플전압을 발생시키고 이를 기존의 12-스텝 인버터에 주입하는데 한대의 링크를 사용하면 12-스텝 동작이 24-스텝으로 전환되며 보조 변압기의 1차 권선을 2N(N=1,2,3...)으로 늘리면 24N-스텝으로 전환된다. 본 방식의 타당성을 실험 및 시뮬레이션을 통하여 입증하였다.
최세완(Sewan Choi),양승욱(Seunguk Yang),김기용(Kiyong Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A new multl-step voltage source inverter is proposed in this paper. The proposed scheme is composed of the double-connected 12-step inverter with an auxiliary circuit. The auxiliary Circuit inc1udes two voltage dividing capacitors. two switching devices and a low KV A autotransformer. The resultant system is shown to be a 24-step inverter suitable for large scale SVC applications in which the PWM method can not be employed.<br/> The design parameters are derived from the analysis of voltages and currents by means of switching functions. The simulation results verify the proposed concept.
Digital Current Mode PFC LED Driver with High Flicker Immunity against Line Distortion
Youngjong Kim(김영종),HyunChul Eom(엄현철),Seunguk Yang(양승욱),Dongjin Park(박동진) 전력전자학회 2013 전력전자학술대회 논문집 Vol.2013 No.7
In the conventional single-stage PFC LED driver with slow feedback response, LED current is easily unstable with visible flicker by randomly distorted line voltage. The proposed single-stage LED driver implements robust LED current regulation against the mains input voltage distortion. Internally generated sine reference by digital mapping significantly stabilizes LED current in the buck-boost topology. Power compensation at load voltage drop is also discussed. The high flicker immunity at the line distortion has been experimentally verified in 7.8 W PFC LED lighting system.
차압 모델을 이용한 실차 Clean CPF 차압 예측에 대한 연구
김진수(Jinsoo Kim),박종선(Jongsun Park),배기송(Kisong Bae),김상래(Sangrae Kim),양승욱(Seunguk Yang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To reduce the carbon particle emission from diesel exhaust, CPF is commonly used for light duty application. The accumulated soot mass could be estimated by analyzing the pressure drop through the CPE Therefore, the pressure drop of clean CPF is the principal information which needs to calculate the pressure drop by soot accumulation. In this study, the pressure drop model based on Darcy's law was simplified to calculate the clean CPF pressure drop as 2<SUP>nd</SUP> order equation by exhaust volume flow rate. The model coefficients for each order term were tuned by steady operating condition analysis as al=661 [10³/L], a2=133[10¹²/L]. The reliability of model was tested with vehicle driving conditions to analyze the behavior of model calculation. The mild and rapid acceleration mode, 0 to 120kph, were used to compare the result of pressure drop model with measured pressure drop through CPE The model showed the accurate result compared with measured pressure drop in steady and mild acceleration mode. The uncertainty of exhaust volume flow rate and temperature was reflected in the deterioration of accuracy at rapid acceleration mode.
엄상철(Sangcheol Eom),강병수(Byeongsu Kang),김현섭(Hyunsop Kim),박인용(Inyong Park),김연용(Yeonyong Kim),황규훈(Kyuhun Hwang),최웅(Woong Choi),양승욱(Seunguk Yang),이현우(Hyunwoo Lee) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.5
본 논문에서는 저궤도 지구관측위성에 적용을 목적으로 개발된 X-band용 2축 안테나지향 기구장치(Dual-axis X-band antenna pointing mechanism)의 설계부터 해석 및 검증시험 까지 개발 과정을 논하고 그 검증 결과를 기술하고 있다. 유사시스템의 개발 및 운용경험을 바탕으로 본 시스템 설계의 주안점과 요구사항을 정의하였고, 제작된 시험인증모델의 발사 및 궤도운용 환경에 대한 검증시험을 통해 시스템의 특성을 확인하였다. 본 과정 중 획득한 시스템의 특성 및 검증기법을 통해 이후 인증모델의 개선점을 도출하였다. This paper describes the design, analysis, and verification tests of the Dual-axis X-band antenna pointing mechanism(XAPM) that has been developed for the Earth observation mission at low Earth orbits. Based on the experience of development and operation of the similar system, we defined the main points and requirements of the system design and confirmed the characteristics of the system through the verification test of the launch and orbit environment test of the engineering qualification model. Through the characteristics and verification techniques of the system acquired during this process, improvement points of the later qualification model are derived.