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ESS가 포함된 태양광 발전의 생애주기 비용추정 사례 연구
유홍국(Hong-Kuk Yoo),구욱현(Ook-Hyeon Gu),노광철(Gwang-Cheol Roh),김재문(Jae-Moon Kim) 대한전기학회 2024 전기학회논문지 Vol.73 No.5
Unlike fossil fuels, renewable energy sources must be critical to preserving our eco system, and ensuring a sustainable future for mankind. In Korea, renewable energy sources are continuously expanded and distributed, and according to The statistics of Korea Electric Power Corporation in 2022, renewable energy accounts for 18.35% of all power generation facilities, of which solar power accounts for 80.34%. In this paper, a case analysis focused on PV accounts for 86.1% of the RPA power purchase amount in Korea. When PV generation facilities with ESS were operated, the annual net profit was very high up to 15 years when ESS REC sales revenue was generated, and in 16 to 20 years after the ESS service life period was over, the net profit was the same as when only PV was operated. Therefore, if solar power generation facilities with ESS were operated, the accumulated net profit was converted to surplus in the 14th year, and if only PV was operated, it was converted to surplus in the 23rd year due to additional investment costs.
홍영선(Young-Seon Hong),유홍국(Hong-Kuk Yoo),심규석(Kyu-Seok Shim),김재문(Jae-Moon Kim) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.5
선로보수 장비에 사용중인 유압작동유(이하 작동유)의 교환은 검수 시행 절차서에 의해 사용시간 기준으로 이루어지고 있으며, 최근에는 성상분석과 오염분석을 위한 유분석 시험을 통해 작동유의 상태를 판단하여 교환하는 기준의 적용을 추진하고 있다. 유분석 시험은 작동유의 열화 정도를 정량적으로 표현할 수 있어 교환기준의 판단은 될 수 있으나, 이후 사용 가능한 수명의 평가는 될 수 없다. 따라서 선로보수 장비에 사용된 작동유 교환의 적정성을 판단하기 위해 유분석 시험과 잔존수명 시험을 통해 비교분석한 결과, 유분석 시험에서 양호한 상태를 보인 작동유라 하더라도 잔존수명 시험에서 산화방지제의 소실 상태가 크게 나타나 교환이 요구되는 사례가 발생되었고, 잔존수명이 충분히 남아있음에도 오염도가 불량한 사례도 발생되었다. 본 연구를 통해 작동유의 상태평가에 의한 사용유 교환의 필요여부를 결정하기 위해서는 기존의 유분석 시험만으로는 다음 점검주기까지 사용 가능 여부의 판단은 무리가 있으므로, 유분석 시험과 함께 잔존수명 평가를 추가적으로 시행하여 산화방지제 고갈로 인한 장비의 치명적인 고장을 미연에 방지할 수 있을 것으로 기대한다. The replacement of hydraulic oil that is used for a track repair machine is conducted according to the service time and the inspection procedure of the machine. Recently, the application of criteria for determining and changing hydraulic oil conditions has been promoted through oil analysis tests for the properties and the pollution of oil. An oil analysis test can show the degree of deterioration of hydraulic oil in quantitative terms, so it can be used as an exchange standard, but it cannot be used for evaluation of the remaining useful life. Therefore, a comparative analysis of a hydraulic oil analysis test and the remaining useful life test has been performed to determine the appropriateness of the hydraulic oil replacement used in the machine. Even though the condition was good in the oil analysis test, there were some cases in the life test that required replacement due to significant antioxidant loss. In some cases, the pollution level was high even though the remaining useful life was sufficient. In order to determine the used oil-exchange conditions through this study, fatal failure of the machine due to the depletion of antioxidants can be prevented through not only oil analysis tests, but also remaining useful life tests.