• Title/Summary/Keyword: Electric ship propulsion system

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The Study on Reduction Method of CO2 Emission from Ships (선박에서의 CO2 배출량 저감 방안 연구)

  • Maeda, Kazuyuki;Kim, Young-Un
    • Journal of Fisheries and Marine Sciences Education
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    • v.25 no.3
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    • pp.705-715
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    • 2013
  • This Paper presented the reduction methods of $CO_2$ emission from ships during voyage. In order to decrease $CO_2$ emission during voyage the equation was established and conducted the study about the relationship between ship speed, the propulsive efficiency and its $CO_2$ production. The results obtained from the examinations are as follows : 1. $CO_2$ emission from sailing ships can be decreased by reducing specific fuel oil consumption of main diesel engine, coefficient of total resistance and ship speed and also by increasing propeller efficiency. 2. Diesel-electric propulsion system is more effective than diesel-mechanical system to decrease the level of $CO_2$ emission during long voyage. 3. Good condition of ship's hull surface, rudder and propeller's surface can decrease the quantity of fuel oil and $CO_2$ emission by reducing the resistance of ship that can rise the propeller efficiency 4. $CO_2$ emitted from ships can be decreased in a global scale by giving attention to the synthetic transport efficiency.

Harmonic Reduction of Electric Propulsion Ship using New Rectification Scheme (새로운 정류방식을 이용한 전기추진선박의 고조파 저감)

  • Kim, Jong-Su;Choi, Jae-Hyuk;Yoon, Kyoung-Kuk;Seo, Dong-Hoan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.10
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    • pp.2230-2236
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    • 2012
  • Currently, the AC-to-DC power conversion system using diode rectifiers is mainly used in large vessels. Also, to reduce the total harmonic distortion(THD) of current and voltage, this system requires an additional phase-shifting transformer which can be powered multi-pulses. In this case, due to the installation of the transformer, the spatial or economic loss occurs. This paper presents a novel active rectification scheme using silicon controlled rectifier(SCR) or insulated gate bipolar transistor(IGBT) devices on behalf of the diode rectifiers which are currently operating in large vessels such as LNG Carrier(LNGC). The proposed system can use the low voltage source and reduce current and voltage harmonics generated by nonlinear loads connected to the power distribution bus and save economic costs by removing the phase-shifting transformers which are used in conventional system. Computer simulations are performed under the electric propulsion system which is operating in current large vessel. The results are shown in support of the improvement of THD included in the current and voltage wave forms of propulsion motor.

A study of the hybrid electric drive generating mode in naval ships (함정용 하이브리드 전기추진 시스템 발전기 모드 적용에 대한 연구)

  • Ryu, Seung-hyun;Jung, Sung-young;Oh, Jin-seok
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.9
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    • pp.967-972
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    • 2015
  • Because of recent interests in energy conservation and prevention of environmental pollution, research related to these topics is increasing. The U.S. Navy has started to study the HED (hybrid electric drive) system in order to improve the COGAG propulsion system's fuel efficiency in AEGIS destroyers. (This ship's fuel consumption is 40% of the total fuel consumption of the U.S. Navy.) In addition, the Korean Navy is considering applications of the HED system in AEGIS destroyers. The purpose of this study is to analyze the U.S.A.'s HED system and to simulate its generating mode energy saving rate using LabVIEW. The results confirmed that the fuel savings are about 700 kg/h.

The Fundamental Study for Torsional Vibration of Diesel Generator Set connected Electric Power Grids (전력망에 연결된 디젤 발전기 세트의 비틀림 진동에 대한 기초 연구)

  • Kim, Hyujung;Yun, Hyunwoo;Barro, Ronald D.;Lee, Donchool
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.294-297
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    • 2014
  • A Shipboard power system consists of three or four diesel generator sets connected to a grid. In case of dual fuel diesel generator sets employed LNG ship as a prime mover, large amounts of electricity are required for electric propulsion, auxiliary machinery and accommodation facilities. The electrical connection between generators through a network, torsional vibration can lead power swings. In this paper, the influence on the network by the torsional vibration of diesel generator sets in grid operation were studied. The torsional vibration characteristics were investigated and analyzed through theoretical analysis and the vibration measurement and the results were presented.

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A study on characteristics of each operation mode for hybrid electric propulsion ship by operation circumstances (선박 운전 환경에 따른 하이브리드 전기추진선박의 운전모드별 출력 특성에 관한 연구)

  • Kim, Jong-Su;Jeon, Hyeon-Min;Kim, Deok-Ki
    • Journal of Advanced Marine Engineering and Technology
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    • v.41 no.3
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    • pp.245-250
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    • 2017
  • Worldwide environmental regulations have been enhanced for emission reduction of greenhouse gases and air pollutants; accordingly, some measures were prepared. Furthermore, the need for effective and reasonable energy-saving methods is growing in accordance with that for environmental pollution minimization. In the case of marine engineering, techniques for the development of eco-friendly vessels have been actively studied, including reduction of exhaust gas emissions, development of alternative fuel, and development of a new propulsion system. In this study, we presented the basic concepts and analyzed the speed, current, voltage, and output power characteristics of each operating mode, i.e., operating mode of battery, generator, and full power.

A Study on Hybrid Electric Drive System for the AEGIS Destroyer (이지스 구축함용 HED 시스템에 관한 연구)

  • Jung, Sung Young;Oh, Jin Seok
    • Journal of the Korea Institute of Military Science and Technology
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    • v.17 no.6
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    • pp.868-876
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    • 2014
  • Arleigh Burke(DDG-51) and Sejong warship are AEGIS destroyer of US Navy and Korea Navy. These are designed to make more than 30knots by applying a COGAG(COmbined Gas turbine And Gas turbine) system. However, the gas turbine(LM2500) in this system has a low SFC (Specific Fuel Consumption) when the warship operated low speed. So, many kinds of companies are researching the HED(Hybrid Electric Drive) system to improve this problem. The purpose of this paper is to analyze the HED system and simulate by Sejong warship data. Serveral methods were used for that purpose. More specifically, the equipment modeling are employed for regression analysis by LabVIEW. As a result, it was found that the warship installed HED system could cut their fuel bills by as much as about 80,000,000won per year.

Power Management System Simulator Modeling and Characteristics Analysis for Electric Propulsion Ship (LNGC용 Power Management System 시뮬레이터 모델링 및 특성분석)

  • Kim, Youngmin;Jeon, Kyung-Won;Jung, Sang-Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.6
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    • pp.878-884
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    • 2015
  • In this paper, Power Management System(PMS) simulator for Liquid Nature Gas Carrier(LNGC) is developed. Major components of power system for LNGC, such as generator, diesel engine and governor, transformer, circuit breaker, and 3 phase loads models are built based on MATLAB/SIMULINK. With these designed major parts, PMS simulator modeling is carried out. Based on MATLAB/Graphical User Interface, PMS simulator control for LNGC, and Human Machine Interface for monitoring is designed. PMS simulator for LNGC carries out simulation according to sequence of characteristics analysis. By comparing results of predicted simulation for each sequence to that of characteristics analysis, the reliability of PMS simulator for LNGC will be verified.

Comparison of characteristics between cam and electric control type of 2 stroke diesel engine for ship propulsion (캠 및 전자제어식 선박추진용 저속 2행정 디젤엔진의 성능 비교)

  • Lee, Sang Deuk;Jung, Suk Ho;Koh, Dae Kwon
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.8
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    • pp.849-854
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    • 2013
  • Many researches on green ship with increasing on economics, efficiency and convenience have been carried out consistently. One of them is development of diesel engines with electronic control. While small duty one for automobiles had been adopted mainly already, disseminating heavy duty one for ships has trouble due to safety and reliability. In order to solve these problem in this study, performance of electronic control and cam type engine installed in parallel on training ship HANBADA of korea maritime university was analyzed and compared. It is certain that specific fuel oil consumption of the electronic control type is lower than cam type and excellent at lower engine load, especially. And the electronic control type shows more effective characteristic at sea trial on specific fuel oil consumption.

A compactly integrated cooling system of a combination dual 1.5-MW HTS motors for electric propulsion

  • Le, T.D.;Kim, J.H.;Hyeon, C.J.;Kim, D.K.;Yoon, Y.S.;Lee, J.;Park, Y.G.;Jeon, H.;Quach, H.L.;Kim, H.M.
    • Progress in Superconductivity and Cryogenics
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    • v.18 no.4
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    • pp.25-29
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    • 2016
  • The high temperature superconducting (HTS) contra-rotating propulsion (CRP) systems comprise two coaxial propellers sited on behind the other and rotate in opposite directions. They have the hydrodynamic advantage of recovering the slipstream rotational energy which would otherwise be lost to a conventional single-screw system. However, the cooling systems used for HTS CRP system need a high cooling power enough to maintain a low temperature of 2G HTS material operating at liquid neon (LNe) temperature (24.5 - 27 K). In this paper, a single thermo-syphon cooling approach using a Gifford-McMahon (G-M) cryo-cooler is presented. First, an optimal thermal design of a 1.5 MW HTS motor was conducted varying to different types of commercial 2G HTS tapes. Then, a mono-cryogenic cooling system for an integration of two 1.5 MW HTS motors will be designed and analyzed. Finally, the 3D finite element analysis (FEA) simulation of thermal characteristics was also performed.

Battery Failure Prediction using BMS Information of ESS Rooms at Offshore Installation Vessel (해양설치선 ESS Room의 BMS정보를 활용한 Battery 고장예측)

  • Kim, Woo-Young;Cheon, Bong-Won;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.10a
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    • pp.59-61
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    • 2021
  • The electric propulsion development is underway to minimize pollutants and greenhous gas emissions during the operation of ships / offshore installation vessels. The importance of the use and efficient management of batteries, which is an ESS system in ships / offshore installation vessels, is increasing. Generally, in ESS where battery is applied, cell balancing and life span are monitored in real time by BMS. Ships / offshore installation vessel are equipped with several ESS rooms, and ESS rooms with ESS systems of the same specification are being constructed due to the recent demand for electric propulsion development. In this paper, we propose an algorithm to additionally predict and diagnose battery pack and cell balancing failures by comparing BMS data for each rooms. The proposed algorithm compares the BMS data of each ESS Room according to the environmental change of the ship / offshore installation vessels, measures accurate status information, and reliably monitors it to prevent accidents in advance.

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