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경부하에서 높은 효율을 갖는 ESS용 PCS의 운전 알고리즘
나광수(Kwang-Su Na),이정(Jeong Lee),김준모(Jun-Mo Kim),이윤성(Yoon-Seong Lee),이준신(Junsin Yi),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper proposes an algorithm for a power conversion system (PCS) for energy storage system (ESS) with high efficiency at light loads. The algorithm proposed in this paper operates up to the maximum efficiency of the PCS and operates up to the rated capacity through load share. The validity of the proposed algorithm was verified by composing the ESS’s PCS with 3 modules of 37.5kW.
열간가공이 9Cr-1Mo강의 기계적 성질과 미세조직에 미치는 영향
김준환 ( Jun Hwan Kim ),백종혁 ( Jong Hyuk Baek ),한창희 ( Chang Hee Han ),김성호 ( Sung Ho Kim ),이찬복 ( Chan Bock Lee ),나광수 ( Kwang Su Na ),김성주 ( Seong Ju Kim ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.10
Thermomechanical processes were carried out to evaluate their effects on the mechanical and the microstructural property of a ferritic-martensitic steel. Modified 9Cr-1Mo steels were hot-rolled at a temperature of either 780℃ or 850℃ after normalizing at 1050℃ and then were air-cooled. Continuous annealing at 850℃ for 2 hours immediately after the hot rolling was also performed and they were compared to the specimens without thermomechanical process. The result showed that there were little differences between the hot rolled specimens in terms of the precipitation density and size. However, V content inside the MX precipitates increased in the case of the specimen rolled at 850℃. The application of the continuous annealing induced coarsening of the Nb-rich MX precipitation as well as an increase in the amount of V-rich MX precipitation, which is expected to enhance high temperature mechanical properties of the ferritic-martensitic steel.