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Controller Design of Boot-Mode ZVS Phase-Shifted Full-Bridge Converter
Cui Enzhen,Jinmok Lee,Kyoungmin Son,Gawoo Park,Jaeho Choi 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
A small signal analysis of phase-shifted-pulse-width-modulated(PS-PWM) converter is elaborated through the small signal modeling of buck-converter. The design procedure of boost type PS-PWM converter which is meeting the requirement of a fuel-cell system is presented based on the analysis. A controller for this model is designed and the simulation result is provided to prove propriety of designing.
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Numerical study of wind profiles over simplified water waves
Shuyang Cao,Enzhen Zhang,Liming Sun,Jinxin Cao 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.21 No.3
Vertical profiles of mean and fluctuating wind velocities over water waves were studied, by performing Large-Eddy Simulations (LES) on a fully developed turbulent boundary layer over simplified water waves. The water waves were simplified to two-dimensional, periodic and non-evolving. Different wave steepness defined by a /λ ( a : wave amplitude; λ : wavelength) and wave age defined by c/Ub (c: phase velocity of the wave; Ub : bulk velocity of the air) were considered, in order to elaborate the characteristics of mean and fluctuating wind profiles. Results shows that, compared to a static wave, a moving wave plays a lesser aerodynamic role as roughness as it moves downstream slower or a little faster than air, and plays more aerodynamic roles when it moves downstream much faster than air or moves in the opposite direction to air. The changes of gradient height, power law index, roughness length and friction velocity with wave age and wave amplitude are presented, which shed light on the wind characteristics over real sea surfaces for wind engineering applications.
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Numerical study of wind profiles over simplified water waves
Cao, Shuyang,Zhang, Enzhen,Sun, Liming,Cao, Jinxin Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.21 No.3
Vertical profiles of mean and fluctuating wind velocities over water waves were studied, by performing Large-Eddy Simulations (LES) on a fully developed turbulent boundary layer over simplified water waves. The water waves were simplified to two-dimensional, periodic and non-evolving. Different wave steepness defined by $a/{\lambda}$ (a : wave amplitude; ${\lambda}$ : wavelength) and wave age defined by $c/U_b$ (c: phase velocity of the wave; $U_b$ : bulk velocity of the air) were considered, in order to elaborate the characteristics of mean and fluctuating wind profiles. Results shows that, compared to a static wave, a moving wave plays a lesser aerodynamic role as roughness as it moves downstream slower or a little faster than air, and plays more aerodynamic roles when it moves downstream much faster than air or moves in the opposite direction to air. The changes of gradient height, power law index, roughness length and friction velocity with wave age and wave amplitude are presented, which shed light on the wind characteristics over real sea surfaces for wind engineering applications.
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이진목(Jinmok Lee),권경민(Kyoung-Min Kwon),손경민(Kyoungmin Son),최은진(Cui enzhen),임재관(Jaekwan Im),최재호(Jaeho Choi) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문에서는 단독부하형 삼상인버터의 디지털 전압제어기를 설계한다. 단독부하운전은 선형부하의 변동이나 비선형 부하에서도 안정적인 전압을 공급하는 것이 목적이다. 삼상 인버터를 선형 제어기로 제어하기 위해서 이상동기회전자표계로 제어하지만 두 개의 간섭항 때문에 MIMO 시스템으로 되어 해석적인 제어기를 설계하기 어려워 대부분의 연구에서는 시행착오법으로 제어기를 설계하였다. 본 논문에서는 삼상 인버터의 축변환시에 발생하는 간섭항의 영향을 상대이득행렬로 분석하여 간섭항의 영향을 분석하고 삼상 인버터 시스템을 SISO 시스템으로 만들어 전압제어기만을 갖는 최소 차수의 제어기를 해석적으로 설계하며 응답속도를 향상시키기위해서 오버슈트와 정정시간을 조절할 수 있는 극배치기법으로 설계한다. 설계한 제어기는 시뮬레이션과 실험을 통해서 강인성을 보인다.
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