한국해양대학교

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양수발전과 압축공기 에너지저장 기술을 이용한 Hybrid 에너지 저장장치의 설계에 관한 연구

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dc.contributor.advisor 이영호 -
dc.contributor.author 박지훈 -
dc.date.accessioned 2019-12-16T02:46:31Z -
dc.date.available 2019-12-16T02:46:31Z -
dc.date.issued 2017 -
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/11524 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002383224 -
dc.description.abstract Storing energy is important since electricity should be available whenever needed and must be used or stored immediately after being generated. Many renewable energy technologies such as solar and wind energy, provide intermittent power generation and sometimes produce surplus electricity when demand is low. Current growth of renewable energy systems are subjected to the issues of higher costs and power instability which makes energy storage systems essential. This research work focuses on a mechanical hybrid energy storage system which uses the concepts of combined pumped hydro storage (PHS) and compressed air energy storage (CAES). The system consists of one open tank to the air and one closed tank which stores water and compressed air. The multistage pump and hydro turbine are used for the charging and discharging process respectively, similar to pumped hydro storage operation in hydropower plants. When the grid power is at surplus, the unused power can be utilized to operate the multistage pump and store water and compressed air in the pressure vessel. The energy of compressed air can be released to drive water which passes through the hydro turbine, resulting in the generation of electricity when the grid power is insufficient. A major disadvantage of the conventional PHS and CAES is that the site where the systems can be installed is rare and have environmental side effects. As an alternative, this energy storage system is capable of overcoming the difficulties posed by PHS and CAES. This system can be used regardless of site conditions, since it uses a pressure vessel instead of two reservoirs of pumped hydro storage. This study was carried out to verify the operating principle and analyze the characteristics of energy charging and discharging of the mechanical hybrid energy storage system. Firstly, the characteristics of energy charging and discharging of lab-scale model was analyzed and additionally CFD analysis and experimental test were performed on the charging and discharging process. It was found that the pressure in the vessel depends only on stored volume and air compression ratio of water at isothermal state without the loss to outside. Therefore, it is more effective to control the discharging flow rate from the pressure vessel in the operation. Secondly, the characteristics study of the charging process by multistage pump depends on variable speed which was carried out. In addition, a numerical model of the multistage pump was made and analysed using CFD and the performance and characteristics of the pump were determined and plotted. By using the plotted data and related formulas, a more efficient charging process by pump operation was found. In this thesis, the submerged floating-type mechanical hybrid energy storage system that can minimize the pressure differences between inside and outside of pressure vessel, by installing it in the sea was suggested. The submerged floating-type mechanical hybrid energy storage system has advantages such as the size reduction of pressure vessel and ensuring stability of the pressure vessel. Regardless, it should be further investigated for stability of mooring line considering effect of ocean current. -
dc.description.tableofcontents 1. 서 론 1 1.1 연구배경 1 1.2 연구목적 3 1.3 에너지 저장 기술의 개요와 설치 사례 4 1.3.1 양수발전 3 1.3.2 압축공기에너지저장 6 1.3.3 플라이휠 에너지 저장장치 8 1.3.4 납축전지 10 1.3.5 Nas전지 12 1.3.6 리튬전지 14 1.3.7 흐름전지 18 1.3.8 ESS의 기술별 특성과 적용분야 21 2. 기계적 Hybrid 에너지 저장 장치 24 2.1 장치의 구조 및 개념 24 2.2 에너지 저장 용량에 따른 압력용기의 크기 결정 27 2.3 펌프의 선정 29 2.4 수차의 선정 32 3. 기계적 Hybrid ESS의 Lab-scale 모델 수치해석 34 3.1 수치해석 기법 34 3.1.1 지배방정식 35 3.1.2 이산화방법 36 3.1.3 난류모델링 39 3.2 에너지 저장에 따른 압력용기의 내부 유동장 분석 41 3.2.1 3D형상 및 격자 41 3.2.2 경계조건 41 3.2.3 내부 유동장 분석결과 44 3.3 에너지 방출에 따른 압력용기의 내부 유동장 분석 51 3.3.1 3D형상 및 격자 51 3.3.2 경계조건 51 3.3.3 내부 유동장 분석결과 53 3.4 에너지 저장용 펌프의 성능해석 66 3.4.1 3D형상 및 격자 66 3.4.2 경계조건 66 3.4.3 성능해석결과 69 3.4.4 에너지 저장 과정에서의 에너지 소모량 비교 72 4. 기계적 Hybrid ESS의 Lab-scale 모델실험 76 4.1 실험장치 76 4.2 계측시스템 76 4.3 실험결과 79 5. 수중부유식 기계적 Hybrid ESS 83 5.1 장치의 구조와 개념 83 5.2 위치하는 수심 변화에 따른 압력용기의 크기 추산 86 6. 결론 90 참고문헌 92 -
dc.format.extent ix, 94 p. -
dc.language kor -
dc.publisher 한국해양대학교 대학원 -
dc.rights 한국해양대학교 논문은 저작권에 의해 보호받습니다. -
dc.title 양수발전과 압축공기 에너지저장 기술을 이용한 Hybrid 에너지 저장장치의 설계에 관한 연구 -
dc.type Dissertation -
dc.date.awarded 2017-08 -
dc.contributor.alternativeName Park, Ji Hoon -
dc.contributor.department 대학원 기계공학과 -
dc.contributor.affiliation 한국해양대학교 대학원 -
dc.description.degree Doctor -
dc.subject.keyword Energy storage system, Pumped hydro storage, Compressed air energy storage, CFD, Model experimentation -
dc.title.translated A Study on the Design of Hybrid Energy Storage System combined by Pumped Hydro Storage and Compressed Air Energy Storage Technology -
dc.identifier.holdings 000000001979▲000000007040▲000002383224▲ -
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양수발전과 압축공기 에너지저장 기술을 이용한 Hybrid 에너지 저장장치의 설계에 관한 연구.pdf Download

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