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제주지역 계통운전조건을 고려한 풍력발전단지용 최소 BESS 용량 산정
진경민(Jin Kyung-Min),김승현(Kim Seong Hyun),김일환(Kim Eel-Hwan) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.4
This paper presents the estimation of minimum BESS capacity for regulating the output of wind farms considering power grid operating condition in Jeju Island. To analyze the characteristics of wind farm outputs with a BESS, the real data of wind farms, Sung-San, Sam-dal and Hang-Won wind farm, located in the eastern part of Jeju island is considered. The wind farms are connected to Sung-san substation to transfer the electric power to Jeju power grid. Consequently, at PCC (Point of Common Coupling), it can see a huge wind farm connected to the substation and thus it can be expected that the smoothing effect is affected by not only the different wind speeds for each area but also the different mechanical inertia of wind turbines. In this paper, two kinds of simulation have been carried out. One is to analyze the real data of wind farm outputs during a winter season, and the other is to connect a virtual BESS to eliminate the unintended generating power changes by the uncontrolled wind farm outputs as shown in the former data. In the conclusion, two kinds of simulation results show that BESS installed in the substation is more efficient than each wind farms with BESS , respectively.
세제 리필스테이션 운영에 따른 전과정 환경적 효과 분석
진경민 ( Kyung Min Jin ),김영운 ( Young Woon Kim ),황용우 ( Yong Woo Hwang ) 한국전과정평가학회 2021 한국전과정평가학회지 Vol.22 No.1
본 연구는 전과정평가(LCA)를 이용하여 세제 기존 판매방식과 리필 스테이션 판매방식에 대한 환경영향을 비교하는 데 목적이 있다. 환경영향범주는 자원발자국, 탄소발자국, 오존층영향, 산성비, 부영양화 및 광화학스모그 등의 6가지 범주로 선정하였다. 기존판매 방식과 리필 스테이션 판매 방식간 환경영향을 비교한 결과는 리필 스테이션 판매방식이 기존 판매 방식에 비해 자원발자국 2.55-03 kg Sb eq., 탄소발자국 1.71E-01 kg CO<sub>2</sub> eq., 오존층영향 1.69E-05 kg CFC11 eq., 산성비 477E-04 SO<sub>2</sub> eq., 부영양화 1.55E-04 kg PO<sub>4</sub><sup>3-</sup> eq., 광화학스모그 1.64-03 C<sub>2</sub>H<sub>2</sub> eq. 정도 환경영향이 저감되는 것으로 나타났다. This study aims at comparing the environmental impact of the previous sales system with the refill station sales system using life cycle assessment. Environmental categories were selected a resource footprint, carbon footprint, an ozone depletion, an acidification, and eutrophication and a photochemical smog. As a result of comparing the previous sales system with the refill station sales system about the environmental impact, the refill station sales system reduced a resource footprint of 2.55E-03 kg Sb eq., a carbon footprint of 1.71E-01 kg CO<sub>2</sub> eq., and an ozone depletion of 1.69E-05 kg CFC11 eq., acidification 4.77E-04 SO<sub>2</sub> eq., eutrophication by 1.55E-04 kg PO<sub>4</sub><sup>3-</sup> eq., and photochemical smog by 1.64E-03 C<sub>2</sub>H<sub>2</sub> eq. compared to the previous sales system.
풍력발전단지 출력보상용 하이브리드 에너지저장장치의 용량산정
김승현(Kim Seong Hyun),진경민(Jin Kyung-Min),오성보(Oh Sung-Bo),김일환(Kim Eel-Hwan) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.4
This paper presents the determination method of the hybrid energy storage capacity for compensating the output of wind power when disconnecting from the grid. In the wind power output compensation, a lot of charging and discharging time with lithium-ion battery will be deteriorated the life time. And also, this fluctuation will cause some problems of the power quality and power system stability. To solve these kind of problems, many researchers in the world have been studied with BESS(Battery Energy Storage System) in the wind farm. But, BESS has the limitation of its output during very short term period, this means that it is difficult to compensat the very short term output of wind farm. Using the EDLC (Electric Double Layer Capacitor), it is possible to solve the problem. Installing the battery system in the wind farm, it will be possible to decrease the total capacity of BESS consisting of HESS (Hybrid Energy Storage System). This paper shows simulation results when not only BESS is connected to wind farm but also to HESS. To verify the proposed system, results of computer simulation using PSCAD/EMTDC program with actual output data of wind farms of Jeju Island will be presented.
제주 행원 풍력발전단지의 출력 안정화를 위한 에너지저장시스템 용량산정에 관한 연구
강명석(Kang Myeong-Seok),진경민(Jin Kyung-Min),김일환(Kim Eel-Hwan),오성보(Oh Sung-Bo),이정민(Lee Jeong-Min) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.1
This paper presents the characteristics of power generation output at Haeng-won wind farm and how to determine the optimized ESS capacity for power stabilizing. Depend on the fluctuationrate of wind power output variation, wind farm capacity and site, power stabilization will be impacted. Therefore, we need to determine proper ESS capacity. Using the actual data of Haeng-won wind farm from 2009.3 to 2010.2., capacity of ESS was determined by moving average value. To verify the proposed algorithm, simulations are carried out with PSCAD/EMTDC program. As a result, optimal ESS capacity of Haeng-won wind farm inJ eju is estimated about 1.63 MWh.
PSCAD/EMTDC에 의한 2020년 제주계통 모델링과 해석
강명석(Myeong-seok Kang),변익수(Ik-su Byun),진경민(Kyung-min Jin),김일환(Eel-hwan Kim) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
In this paper, the virtual power grid of Jeju in 2020 is modelled including not only VSC HVDC(Voltage Source Current-High Voltage Direct Current) but also wind power generators as 200㎿ for onshore and 500㎿ for offshore by PSCAD/EMTDC. Each active power and reactive power are able to controlled by the VSC HVDC. In addition, to verify the characteristic of the modeling VSC HVDC, those wind power generators are cut off from the grid. The result show that the modeling power grid of Jeju become stabilized after 0.1second from failure.
유광현(Kwnag Hwon You),김태현(Tae Hyeon Kim),나용호(Yong Ho Nah),장명규(Myoung Kyu Jang),김형언(Hyeong Eon Kim),진경민(Kyung Min) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.3
N/A Background/Aims: Defecography is a useful diagnostic method that demonstrates the physiolo- gical, dynamic and anatomic features involved when rectum evacuates semisolid barium contrast media. In Korea, there has recently been increased interest in the use of defecography for the investigation of problems of defecation and pelvic floor dysfunction. Interpretations of abnormal findings, however, are questionable because of the absence of suitable control subjects to define the state of normality. The present study was carried out to determine the normal range of defecographic findings encountered in healthy Koreans. Methods: Fifty healthy volunteers(men:25, women:25) (mean age: 32.6yrs) underwent defecographic examinations. Results: The mean resting centroid anorectal angle was 1l9, decreasing to 108 during squeeze and increasing to l39 on defecation. The mean perineal floor position in the resting state was 6 cm, descending 3 cm in men and 3.5 cm in women during defecation, taking account of the magnification of the X-ray film. All subjects had a closed anal canal in the resting state and the anal canal was widely opened to 2.5 cm during defecation. Loss of the impression of puborectalis sling on the posterior wall of the distal rectum during straining was observed in the all subjects. Conclusions: The anorectal angle increases by 20 on straining and decreases by lO on squeeze from 120 at rest, The anorectal junction lies less than 6 cm below the pubococcygeal line and the descent of pelvic floor during defecation not more than 3 cm in men and 3.5 cm in women below the resting position, wide opening of anal canal(2.5 cm) on evacuation, and loss of impression of puborectalis sling on the posterior wall of distal rectum during defecation. Rectoceles or rectal intussusception may be present in the asymptomatic healthy individuals. But the rectocele is small (less than 4cm in length) and does not have barium trapping. The intussuscepting rectal folds are not thick(less than 0.7 cm in width) and short(less than 4.5 cm in length). (Korean J Gastroenterol 1995;27:309 - 316)