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부하의 자기제어성에 기반한 수전해 저주파수부하차단 기법
김기훈,정윤철,김우현,강경수,정광진,정남조,고희상,최영준 한국에너지기후변화학회 2023 에너지기후변화학회지 Vol.18 No.2
As an increase in the share of renewable energy (RE), the present practice requires a more friendly operation manner from water electrolysis device (WED) in the viewpoint of high-utilization energy carrier. This, in turn, requires a scheme for the WED interconnection, allowing connection to the system with having to take part in the stabilization effort. Thus, in order to maintain the stability due to sudden disconnection as well as increase or decrease of high capacity WED, necessary control actions are needed. This paper presents a under-frequency load-shedding (UFLS) scheme to WED in order to prevent further grid frequency drop. In doing so, the scheme utilizes a concept of grid self-regulation characteristics. The effectiveness of the proposed scheme is verified by simulation studies in the PSCAD/EMTDC environment. The proposed UFLS reduced Nadir by 1.26 Hz due to the sudden change in load and improved the steady-state frequency at 20 seconds by 0.44 Hz. Thus, the simulation shows that the proposed scheme can be feasible and justifiable for the application of different system configurations.
윤태호,이우철 한국전자통신학회 2023 한국전자통신학회 논문지 Vol.18 No.6
As the number of patient with degenerative joint diseases increases rapidly due to the aging society. However, high radio-frequency electro-surgical instrument and high radio-frequency electrode probe using high voltage may cause problems such as deformation of living tissue, verve damage and electric shock due to excessive heat generation. In this study, in order to solve these problems, a high radio-frequency electrode probe for under water treatment was manufactured, and an Open Loop evaluation system was devised to confirm the safety.
최한규,정영덕,백효선 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B
The propose of this study is to survey the revetments installed in Gangwon Province for identifying their characteristics. The survey showed that in eastern Gangwon Province, gabion, retaining wall and concrete blocks took about 63% or more, and in western Gangwon Province, dry wall, gabion and retaining wall, 68% or more. Gabion and dry wall had better vegetation coverage in western Gangwon Province than in eastern Gangwon Province. That is thought to be due to slope of river and under-water frequency.
최한규(Choi, Han-Kuy),정영덕(Jung, Young-Duk),백효선(Baek, Hyo-Seon) 강원대학교 산업기술연구소 2009 産業技術硏究 Vol.28 No.B
The propose of this study is to survey the revetments installed in Gangwon Province for identifying their characteristics. The survey showed that in eastern Gangwon Province, gabion, retaining wall and concrete blocks took about 63% or more, and in western Gangwon Province, dry wall, gabion and retaining wall,68% or more. Gabion and dry wall had better vegetation coverage in western Gangwon Province than in eastern Gangwon Province. That is thought to be due to slope of river and under-water frequency.