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제주계통의 STATCOM 상정사고를 고려한 전력품질 해석
고지한(Ko Ji-Han),김동완(Kim Dong-Wan),김승현(Kim Seong Hyun),김호민(Homin Kim),김일환(Kim Eel-Hwan) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
This paper presents the modeling and contingency analysis of Jeju power system. For the analysis of contingency with simulation, thermal power plants, current source type HVDC systems, wind farms, STATCOMs and Jeju power load are modeled by PSCAD/EMTDC program. And three kinds of simulation are carried out. Firstly, two STATCOMSs are in normal operation. Secondly, one STATCOM is in fault. Lastly, all of STATCOMs are in fault. These comparative studies will be useful for evaluating the effectiveness of STATCOM to stabilize for the Jeju power system.
고지수(Ko, Ji-Soo),정한욱(Jeong, Han-Wook),공대영(Gong, Dae-Yeong),이원백(Lee, Won-Baek),김광열(Kim, Kwang-Ryul),신성욱(Shin, Sung-Wook),박홍진(Park, Hong-Jin),최병덕(Choi, Byoung-Deog) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
One of the most important issues of crystalline silicon solar cell is minimizing reflectance at the surface. Laser texturing is an isotropic process that will sculpt the surface of a silicon wafer, regardless of its crystallographic orientation. We investigated surface texturing process using Nd-YAG laser (lambda=1064 nm) on multi-crystalline silicon wafer. Removal of slag formed after the laser process was performed using acid solution (HF : HNO₃ : CH₃COOH : DI water). The reflectance and carrier lifetime of the samples were measured and analyzed using UV-Vis spectrophotometer and carrier lifetime tester. It was found that the minimum reflectance of the samples was 16.39% and maximum carrier life time was 21.8;{mu}s.
김동완(Kim Dong-Wan),고지한(Ko Ji-Han),김승현(Kim Seong Hyun),김호민(Homin Kim),김일환(Kim Eel-Hwan) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
This paper presents a renewable energy configuration plan of Micro grid in Gapa Island. To analyze the characteristics of Micro grid, BESS (Battery Energy Storage System), PMSG (Permanent Magnet Synchronous Generator) and SCIG (Squirrel Cage Induction Generator) are first modelled. The PMSG and SCIG will operate with basis on the real power curve. when the total power demand is larger than the total power generation, the BESS will be operated and the SOC (State Of Charge) is reduced. If the value of SOC could drop down to limited value, the system may be broken because of the voltage drop of BESS. To solve this problem, a DG (Diesel Generator) is used to charge the BESS and keep the voltage value of BESS with in a allowance limit. This paperre presents simulation result when PMSG, SCIG connected to the Micro grid installed in Gapa Island. The simulation is carry out by using PSCAD/EMTDC program with actual line constant and transformer parameter in Gapa Island.