• Title/Summary/Keyword: 하이브리드 시스템

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ASADAL/OBJ Hybrid: An Object-Oriented Framework for Modeling and Validating Hybrid Systems (ASADAL/OBJ Hybrid: 고신뢰성 하이브리드 시스템 모델링을 위한 객체지향 프레임워크)

  • Shin Seungyeob;Kim Moonzoo;Kang Kyo C.
    • Proceedings of the Korean Information Science Society Conference
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    • 2005.07b
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    • pp.337-339
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    • 2005
  • 하이브리드 시스템이란 연속적인 변화와 이산적인 변화가 함께 존재하는 시스템으로 많은 임베디드 시스템이 하이브리드 시스템으로 모델링 된다. 이러한 하이브리드 시스템을 모델링하고 타당성을 검사(validation) 할 수 있는 도구의 제안은 시스템 개발자들에게 하이브리드 시스템의 복잡한 변화로 인한 시스템의 복잡성을 간소화 시킬 수 있는 방법을 제공하고, 고품질의 제어 소프트웨어를 개발할 수 있도록 해준다. 본 논문에서 소개하는 ASADAL/OBJ Hybrid는 고신뢰성 하이브리드 시스템 모델링을 위한 도구로써 객체지향 모델링에 따라 여러 하이브리드 시스템을 객체로 모델링하며, 이들 간의 통신은 이벤트와 데이터 전송으로 이루어지도록 한다. 환경 객체의 경우 3D 형태 정보를 가지고 있어서 3D 시뮬레이션을 통해 시스템의 변화 양상을 개발자에게 직관적으로 제공하도록 하고 있다.

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Review of Dual Active Bridge Converter Applied to PV-ESS Hybrid System (태양광-ESS 하이브리드 시스템에 적용되는 DAB 컨버터 리뷰)

  • Lee, HanWoo;Lee, KyungSoo
    • Proceedings of the KIPE Conference
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    • 2020.08a
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    • pp.385-386
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    • 2020
  • 최근, 에너지저장장치를 활용하여 태양광-ESS 하이브리드 시스템이 도입되고 있다. 태양광-ESS 하이브리드 시스템은 구성방식에 따라 다양한 전력변환장치를 활용한다. 그중 DAB 컨버터는 절연형이며, 양방향 전력전달이 가능하므로 스위칭 기법, 토폴로지 개발 등 연구가 활발히 진행되고 있다. 본 논문에서는 태양광-ESS 하이브리드 시스템에 적용되는 대표적인 벅-부스트 컨버터와 DAB 컨버터에 대해 리뷰한다.

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An ETRI CPS Modeling Language for Specifying Hybrid Systems (하이브리드 시스템을 명세하기 위한 ETRI CPS 모델링 언어)

  • Yoon, Sanghyun;Chun, In-geol;Kim, Won-Tae;Jo, Jaeyeon;Yoo, Junbeom
    • Journal of KIISE
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    • v.42 no.7
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    • pp.823-833
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    • 2015
  • Hybrid system is a dynamic system that is composed of both a continuous and discrete system, suitable for automobile, avionic and defense systems. Various modeling languages and their supporting tools have been proposed and used in the hybrid system. The languages and tools have specific characteristics for their purpose. Electronics and Telecommunications Research Institute (ETRI) proposed a hybrid system modeling language, ECML (ETRI CPS Modeling Language). ECML extends DEV&DESS (Differential Event and Differential Equation Specified System) formalism with consideration of CPS (Cyber-Physical System), which supports modeling and simulation. In this paper, we introduce ECML and suggest a formal definition. The case study specifies a simple vehicle model using the suggested formal definition.

Control of Hybrid System using Open Winding Machine (오픈 와인딩 머신을 이용한 하이브리드 시스템의 제어)

  • Kwak Mu-Shin;Sul Seung-Ki
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.336-338
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    • 2006
  • 오픈 와인딩 머신을 이용한 새로운 하이브리드 시스템을 제안한다. 본 시스템은 기존 하이브리드 시스템의 DC/DC 전력 변환기와 이에 필요한 인덕터를 필요로 하지 않으며, 주어진 DC 링크 전압과 배터리 전압으로 보다 높은 속도 운전영역까지 최대 토크 운전이 가능하다. 또한 전동기의 기계 출력, 배터리의 입출력 전력, DC링크단의 입출력 전력을 모두 양방향으로 제어할 수 있는 제어 알고리즘을 제안한다.

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Performance Analysis of Hybrid SOFC/Uncooled GT System for Marine Power Applications (선박동력용 SOFC/GT(무냉각) 하이브리드시스템의 성능 평가)

  • Kim, Myoung-Hwan;Kil, Byung-Lea
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.8
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    • pp.1050-1060
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    • 2012
  • As an approach to high-efficiency of SOFC system, SOFC/GT Hybrid system is effective. However, if the output size of the system belongs to the marine class of dozens MWs, the introduction of the cooling system of GT system, which is used as sub-system, makes its related devices complicated and also makes its control difficult. Accordingly, for the marine use, SOFC/GT (non-cooling)Hybrid system looks more suitable than SOFC/GT(cooling)Hybrid system. This study established the SOFC/GT (non-cooling)Hybrid system, and examined the operating temperature & current density of the stack for the system, pressure ratio of the gas turbine, the influence of TIT(Turbine Inlet Temperature) on system performance, etc. through the simulation process. Through this research process, this study was able to confirm that electrical efficiency rises in spite of the increase in the required power for the air compressor, and there exists a limited range of temperatures for operation in TIT.

ZeSH-II에 적용된 태양열+지열하이브리드시스템 사례

  • Kim, Yong-Gyeong;Im, Hyeong-Chan;Hong, Seong-Geun;Baek, Nam-Chun
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.40 no.5
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    • pp.50-55
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    • 2011
  • 에너지의 85% 이상이 자립형 주택인 제로에너지솔라하우스에 적용된 신재생에너지 기술 중 태양열+지열 하이브리드 시스템을 소개한다.

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Performance Prediction and Economic Assessment of Atmospheric Pressure MCFC/Gas Turbine Hybrid System with Indirect Turbine Firing (터빈 간접가열식 상압형 MCFC/가스터빈 복합시스템의 성능예측과 경제성 평가)

  • Choi, Joo Hwan;Kim, Tong Seop;Kwak, Bu Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.1
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    • pp.31-39
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    • 2014
  • The performance of fuel cell/gas turbine hybrid systems is highly affected by system configuration. In this study, the performance of a hybrid system combining a molten carbonate fuel cell (MCFC) and an indirectly fired gas turbine was predicted. Firstly, general performance trends of the hybrid system depending on major design parameters were examined. Then, the most feasible design options with the least impact on the MCFC stack design conditions were drawn. The economic advantage of the hybrid system over the basic MCFC only system was evaluated.

Performance Analysis of GT/ST Hybrid System for Marine Power Applications(under Conditions of Air-Cooled Gas Turbine) (가스터빈의 냉각공기를 고려한 선박동력용 GT/ST 하이브리드시스템의 성능 평가)

  • Kim, Sun-Hee;Jung, Byung-Gun;Kim, Myoung-Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.5
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    • pp.586-594
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    • 2012
  • A future type ship power system requires both economic and eco-friendliness. That is, this should be reduced the discharge quantity of air pollutants and green-house gases as well as have high energy efficiency. Recently, gas turbines have been realized a lot of technical development in terms of efficiency and safety, and are widening the example of their adoption to a GT/ST hybrid system in a power plant as well as an aviation use. This paper reviewed the performance characteristics of a GT/ST hybrid system of several ten MW class, not large capacity, with a simulation in order to evaluate the possibility of a GT/ST hybrid system for ships. The reviewed GT/ST hybrid system has maximum 49 % efficiency, has the highest efficiency point for TIT, and has a 70~75 % and 25~30 % load ratio for a gas turbine and a steam turbine respectively.

Off-design Performance Characteristics of SOFC-GT Hybrid System Operating with Syngas Fuel (합성가스를 연료로 사용하는 고체산화물연료전지-가스터빈 하이브리드 시스템의 탈설계점 성능 특성)

  • Choi, Jung-Il;Sohn, Jeong-Lak;Song, Seung-Jin;Kim, Tong-Seop
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.3
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    • pp.269-274
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    • 2010
  • As a preliminary study on a SOFC-GT hybrid system integrated a with coal-gasification system, the influence of the concentrations of $H_2$ and CO in syngas on the performance characteristics of the hybrid system is investigated. It is expected that the differences in the heating values of fuels with different compositions trigger the off-design operation of the gas turbine and result in different performance characteristics of the overall hybrid system. Syngas compositions are found to affect the SOFC performance. Performance of hybrid system with carbon monoxide is poorer than the case with hydrogen. In the case of part-load performance with syngas, performance degradation at part-load operating conditions with hydrogen is more dominant than the case with carbon monoxide.

Integrated Hybrid Modeling Methodology and Simulation Engine Design Based on HDEVS Formalism (HDEVS 형식론에 기반한 통합 하이브리드 모델링 방법론 및 시뮬레이션 엔진 설계)

  • Kwon, Se Jung;Sung, Changho;Song, Hae-Sang;Kim, Tag Gon
    • Journal of the Korea Society for Simulation
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    • v.22 no.1
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    • pp.21-30
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    • 2013
  • A hybrid system is a combination of sub systems which have different types of state and time: a typical example is a combination of discrete event and continuous systems. A HDEVS(Hybrid DEVS) formalism was proposed for modeling and analyzing a hybrid system. The HDEVS formalism allows modelers to construct a hierarchical and modular model based on the mathematical set theory. Because the HDEVS formalism was applied to the distributed and interoperated simulators, modelers should make several heterogenous models dividing a target system. Hence, this paper proposes an extended hybrid coupled model of HDEVS formalism and an integrated hybrid modeling methodology in contrast to the existing simulation framework on interoperable simulators. By applying the proposed modeling method, a target system can be translated to a hybrid model in a similar form as the target system. This paper also contains a simulation engine design for the proposed modeling methodlogy and a case study which simulates water tank control systems.