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3상 양방향 인버터의 계통전압 불평형 및 왜곡에 의한 계통전류 보상
양승대,김승민,최주엽,최익,송승호,이상철,이동하,Yang, Seung-Dae,Kim, Seung-Min,Choi, Ju-Yeop,Choy, Ick,Song, Seung-Ho,Lee, Sang-Cheol,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
This paper presents the algorithm of the compensation of the grid current distortion caused by the grid voltage unbalance and distortion in 3-phase bi-directional DC to AC inverter. Usually 3-phase grid system has unbalance and distortion because of connecting 1-phase and non-linear load with 3-phase load using same input node. Controlling 3-phase inverter by general method under the unbalanced and distorted grid voltage, the grid current has distortion. This distortion of the grid current cause the grid voltage distortion again. So, it need to control the grid current balanced and non-distorted, even the grid voltage gets unbalanced and distorted. There are some complex method to compensate the gird current distortion. it sugest simple method to solve the problem. PSIM simulation is used to validate the proposed algorithm.
양승대,Mayank Kinger,Yong Dae Park,Jeong Hoon Park,허민구,정형재,Su-Jin Park,이우송,김상욱 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.4
A series of 1,3-diarylprop-2-en-1-one derivatives 3a-v have been synthesized and evaluated for their ability to inhibit neuraminidase (NA). Among the prepared compounds, the less lipophilic derivative 3k showed the most potent in vitro inhibitory activity against NA with an IC50 value of 1.5 μM.
< 51Cr > Cr ( III )-EDTA 착물 합성 및 < 51Cr > Cr ( III )-EDTA 주사후 두경부 방사능 계측에 의한 사구체 여과율 측정
양승대,임상무,전권수,서용섭,윤용기,박현,우광선,정위섭,오옥두,이종두 ( Seung Dae Yang,Sang Moo Lim,Kwon Soo Chun,Yong Sup Suh,Yong Ki Yoon,Hyun Park,Kwang Sun Woo,Wi Sup Chung,Jong Doo Lee,Ok Doo Oh ) 대한핵의학회 1994 핵의학 분자영상 Vol.28 No.3
The purpose of this study is to evaluate the clinical application of the no carrier added[Cr] Cr(UI) EDTA complexes, produced at Korea Cancer Center Hospital. The [Cr]Cr(lll) EDTA complexes, useful for measurement of GFR were prepared at room temperature in the presence of bicarbonate catalysts. The radiochemical purity of[Cr]Cr (Iil) EDTA was over 99% by paper electrophoresis. The time activity curves were obtained by counting the blood samples from 5 volunteers and counting the head and neck regions with whole body counter after inject#ion of the Cr EBTA, respectively, After the nonlinear regression, the area under curve was obtained. The plasma clearance of the Cr-EDTA was calculated with injected dose/AUC. The clearance rate calculated with the head and neck countmg data was in good agreement with t,he result from the plasma sample radioactivity at, 1-3 hrs after injection. From this result, the counting of head and neck region and the nonlinear regression by 2-compartment model could be applied for the measurement of the clearance rate. Using MIRD system, the absorbed radiation dose was calculated by residence time x S. The absorbed whole body radiation dose was negligibly small.
3상 양방향 인버터의 계통전압 불평형 및 왜곡에 의한 계통전류 보상
양승대,김승민,최주엽,최익,송승호,이상철,이동하 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
This paper presents the algorithm of the compensation of the grid current distortion caused by the grid voltage unbalance and distortion in 3-phase bi-directional DC to AC inverter. Usually 3-phase grid system has unbalance and distortion because of connecting 1-phase and non-linear load with 3-phase load using same input node. Controlling 3-phase inverter by general method under the unbalanced and distorted grid voltage, the grid current has distortion. This distortion of the grid current cause the grid voltage distortion again. So, it need to control the grid current balanced and non-distorted, even the grid voltage gets unbalanced and distorted. There are some complex method to compensate the gird current distortion. it sugest simple method to solve the problem. PSIM simulation is used to validate the proposed algorithm.
양승대(Yang, Seung-Dae),정승환(Jung, Seung-Hwan),최주엽(Choi, Ju-Yeop),최익(Choy, Ick),이상철(Lee, Sang-Chul),이동하(Lee, Dong-Ha) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
This paperis aboutthe study ofa stand-alone photovoltaic powerconditioning system with an energy storage system with battery.The paper proposes the appropriate circuit modelof stand-alone PV PCS considering the maintenance of the battery system. It also proposes the buck converter modeling by a state-spaceaveraging method considering characteristics of solar cell. Lastly, it shows the way to choose the suitable battery and to design the model of bi-directional converter for charging and discharging battery. PSIM simulation is used to validate the proposed algothim of the system.
양승대(Yang Seung-Dae),심재휘(Shim Jae-Hwe),최주엽(Choi Ju-Yeop),송승호(Song Seung-Ho),최익(Choy Ick),안진웅(An Jin-Ung),이동하(Lee Dong-Ha) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Now, inductor is the common device using widely in the photovoltaic system and power electronics. Therefore, each inductor has different core loss and iron loss depending on the size and kind of core materials, it is important to analyze loss characteristic for better inductor efficiency. This paper offers an efficiency calculation for PCS inductor loss, and different kinds of core materials are analyzed for optimized PCS inductor design.
자립형 태양광 발전 시스템을 위한 3상 양방향 DC-AC 인버터 연구
양승대(Yang Seung-Dae),정승환(Jung Seung-Hwan),최주엽(Choi Ju-Yeop),최익(Choy Ick),이영권(Lee Young-Kwon) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
This paper presents the study of 3-Phase bi-directional DC to AC inverter with unity power factor. 3-Phase bi-directional DC to AC inverter is important for the bi-modal PV PCS with an energy storage system. Both Inverting and converting are needed to connect between the grid side and boost converting side to charge and discharge the energy storage system. The paper proposes the appropriate circuit topology and proper control system for the bi-directional inverter. It also proposes the method of selecting the optimum control method considering system stability. PSIM simulation is used to validate the proposed algorithm.