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Design of a back-to-back converter to simulate transient state of renewable sources
김남원(Namwon Kim),김상용(Sang-Yong Kim),이효근(Hyo-Guen Lee),황철상(Chulsang Hwang),김경훈(Gyeong-Hun Kim),서효룡(Hyo-Ryong Seo),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper describes a design of grid-simulator for experiment of transient stability of grid-connected renewable energy system. A transient analysis of renewable energy system has been researched by a simulation, because direct connection of renewable energy system and real utility is dangerous and it is hard to produce the transient grid condition. If a grid-simulator is used in the transient stability experiment, the transient grid condition might be generated easily with reference data and there is no impact on the grid. The grid-simulator composed of a back-to-back converter was designed and simulated with PSCAD/EMTDC to verify its operational characteristics.
하도준,김병수,김인근,송호인,이영재,Ha, Do-Jun,Kim, Byoung-Soo,Kim, In-Keun,Song, Ho-In,Lee, Young-Jae 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3
This paper presents a study on characteristics of precession motion of a smart munition. It's a kind of the Sensor Fuzed Weapon. The particular thing for the smart munition is that it has precession motion in the air while the sensor is searching the ground to detect ground vehicles such as tanks. The smart munition has a cylindrical shape and has a sensor attached on its side. Due to its non-uniform mass distribution, its center of gravity(CG) is located away from the center of volume(CV). In order for the smart munition to detect the target effectively, the ground searching pattern of sensor should have an uniform circular form, and for this, the precession motion of smart munition should be in its steady-state. Finally, it is necessary to choose the right initial conditions at the moment of firing, for the steady-state precession motion during flight.
김상용(Sang-Yong Kim),김남원(Namwon Kim),황철상(Chulsang Hwang),이효근(Hyo-Guen Lee),김경훈(Gyeong-Hun Kim),서효룡(Hyo-Ryong Seo),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Converter per photovoltaic module (CPM) system has been researched to increase the efficiency of photovoltaic (PV) power generation system. The stability and efficiency of PV system might be different according to the connection structure of CPMs. Differences between series and parallel connection of CPMs for PV power generation system were analyzed in this paper. Boost type CPM was used to control maximum power of each PV module. CPMs were connected in series, and parallel to compare the PV output power according to the converter connection. More effective connection of CPMs is proposed by the simulation considering abnormal operation of converter of the PV system.