• Title/Summary/Keyword: 하이브리드 시스템

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A Study on Proposing Practicable Configurations against Propeller Racing for SOFC/GT Hybrid System in Ships (프로펠러 레이싱에 대비한 SOFC/GT 하이브리드시스템의 대책 방안에 관한 기초적 연구)

  • Kim, Myoung-Hwan;Lim, Tae-Woo
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.2
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    • pp.256-261
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    • 2008
  • The purpose of this study is to propose practicable configurations against Rapid Load Down like propeller racing of ships which have been using SOFC/GT hybrid system on board. This paper suggests four kinds of countermeasures against propeller racing. The types A and B keep a fixed load of SOFC and save a surplus electric power to a storage system. In types of C and D, the load of SOFC is changed with the propeller racing. The best desirable countermeasure for Rapid Load Down depends upon the size of the ship, the propulsion power, and the characteristics of the engine system.

Battery Control Technique by Bidirectional DC-DC Converter in Hybrid Energy System (하이브리드 에너지 시스템에서 양방향 DC-DC 컨버터에 의한 축전지 제어 기법)

  • Jung Sangmin;Jo Jinsang;Choi Sewan;Han Soobin
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.359-363
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    • 2004
  • 본 연구에서는 축전지를 포함하는 하이브리드 시스템에서 최소 규모의 축전지를 양방향 컨버터를 이용하여 직류단에 연결함으로써 에너지를 충${\cdot}$방전시킬 수 있는 제어 기법을 제안한다. 사용된 양방향 컨버터는 본 연구에서 고려하는 시스템 사양에서 가장 경제적인 비절연형 single-phase 컨버터의 구조이다. 본 논문에서는 하이브리드 시스템 내에서의 양방향 컨버터의 동작 제어와 축전지를 효과적으로 관리할 수 있는 제어 알고리즘에 대해서 연구하였다.

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Hybrid System Design for Emergency Power Supply of Ground Robots (지상 로봇의 비상 전원 공급을 위한 하이브리드 시스템 설계)

  • Jo, Yeong-Min;Choi, Ju-Yeop;Choy, Ick;Cho, Sang-Yoon;Lee, Dong-Ha
    • Proceedings of the KIPE Conference
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    • 2014.11a
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    • pp.54-55
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    • 2014
  • 일반적으로 지상 로봇의 주 전원으로 사용되는 대용량 배터리가 예상치 못한 시점에 방전되거나 고장으로 인해 전원 공급이 되지 않을 경우 지상 로봇의 위치 확인이 필요하게 된다. 이에 따라 본 논문에서는 이 통신용 비상 전원 공급을 위한 태양광 및 연료전지 전원 공급 장치와 이 장치를 보완하여 사용할 수 있는 배터리 충 방전 하이브리드 시스템을 설계하고, 이를 시뮬레이션과 실험을 통해 타당성을 검증 및 분석하도록 한다.

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Performance Characteristics Analysis of Gas Turbine-Pressurized SOFC Hybrid Systems (가스터빈-가압형 SOFC 하이브리드 시스템의 성능특성 해석)

  • 양원준;김동섭;김재환
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.7
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    • pp.615-622
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    • 2004
  • Recently, the hybrid system combining fuel cell and gas turbine has drawn much attention owing to its high efficiency and ultra low emission. It is now on the verge of world wide development and various system configurations have been proposed. A national project funded by Korean government has also been initiated to develop a pressurized hybrid system. This work aims at presenting design performance analysis for various possible system configurations as an initial step for the system development. Study focuses are given to major design options including the power ratio between gas turbine and fuel cell, reforming method (internal or external), reforming heat source (reforming burner, cathode hot air, fuel cell heat release) and steam supply method for reformer (anode gas recirculation, external steam generator). A wide variation in performance among different configurations has been predicted.

Performance Analysis of Marine Solid Oxide Fuel Cell and Gas Turbine Hybrid Power System (under Conditions of Turbine Cooling and Constant Temperature in Cathode Inlet) (선박동력용 SOFC/GT 하이브리드시스템의 성능 평가 (터빈 냉각 및 공기극 입구온도 일정 조건을 중심으로))

  • Lim, Tae-Woo;Kil, Byung-Lea;Kim, Jong-Su;Oh, Sae-Gin;Park, Sang-Kyun;Kim, Mann-Eung;Kim, Myoung-Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.8
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    • pp.1107-1115
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    • 2009
  • The strengthened regulations for atmospheric emissions from ships like MARPOL Annex VI have caused a necessity of new, alternative power system in ships for the low pollutant emissions and the high energy efficiency. This paper attempts to investigate the configuration of SOFC/GT hybrid power system for marine applications like LNG tanker and to analyze the influence of design parameters on the system performance. The simulation results provide the basic data for the design and efficiency improvement of SOFC/GT hybrid system and indicate the guidelines for the safe system operation.

An Efficient Hybrid Simulation Methodology Using the Game Physics Engine (물리엔진을 이용한 효과적인 하이브리드 시뮬레이션 방법론)

  • Lee, Wan-Bok;Ryu, Seuc-Ho
    • Journal of Digital Convergence
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    • v.10 no.10
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    • pp.539-544
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    • 2012
  • Most of the man-made systems can be modeled as a hybrid system which consists of both the high-level and the low-level component model. High level model is responsible for decision-making and the low-level one takes control of the mechanical component parts. Since the two models requires different interpretation method according to their type, analysis of a hybrid system becomes a difficult job. For the Analysis of the high-level model, methods for discrete event system models such as FSM can be used. On the contrary, numerical analysis techniques are required for the low-level continuous-time system model. Since it becomes a difficult thing for a modeller specifies and develops both the two-level models altogether, we propose an efficient hybrid simulation method which employs a game physics engine that has been widely and successfully used in the area of game industry.

A study on performance improvement of neural network using output probability of HMM (HMM의 출력확률을 이용한 신경회로망의 성능향상에 관한 연구)

  • Pyo Chang Soo;Kim Chang Keun;Hur Kang In
    • Journal of the Institute of Convergence Signal Processing
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    • v.1 no.1
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    • pp.1-6
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    • 2000
  • In this paper, the hybrid system of HMM and neural network is proposed and show better recognition rate of the post-process procedure which minimizes the process error of recognition than that of HMM(Hidden Markov Model) only used. After the HMM training by training data, testing data that are not taken part in the training are sent to HMM. The output probability from HMM output by testing data is used for the training data of the neural network, post processor. After neural network training, the hybrid system is completed. This hybrid system makes the recognition rate improvement of about $4.5\%$ in MLP and about $2\%$ in RBFN and gives the solution to training time of conventional hybrid system and to decrease of the recognition rate due to the lack of training data in real-time speech recognition system.

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