• Title/Summary/Keyword: diesel generator

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Protection Coordination Study in Smart Grid with Diesel Generator (디젤발전기가 포함된 스마트그리드 보호계전 방안 연구)

  • Lee, Kang-Wan;Hong, Jong-Seok
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.784-785
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    • 2011
  • 보호계전시스템은 전력계통 운영 상태를 감시하여 전기 사고시 고장부분을 분리함으로써 전력공급 신뢰성 제고 및 고장파급 억제 기능을 수행한다. 스마트그리드는 신재생에너지원을 포함한 다양한 분산전원을 구비하고 있어, 전기 고장시 이들 분산전원으로부터 고장전류가 고장점으로 유입된다. 앞으로 보급 확산이 예상되는 소규모 스마트 그리드 구성 및 운전 형태별 고장전류를 해석하고 이를 이용하여 실현 가능한 스마트그리드 보호계전시스템의 구현 및 이의 동작 설정 값을 계산한다. 아울러 스마트그리드에 발생한 고장전류 크기 및 분포에 관련한 보호계전시스템의 적정성을 조사 및 분석한다.

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A Study on the Voltage Compensation Converter to decrease fuel consumption of RTGC (RTGC의 연료절감을 위한 전압 보상 컨버터에 관한 연구)

  • Bayasgalan, Bayasgalan;Ryu, Ji-Su;Han, Dong-Hwa;Lee, Young-Jin;Lee, Sang-Ho;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.280-282
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    • 2011
  • This paper presents a development of voltage compensation dc/dc converter to decrease fuel consumption of RTGC system. We used 3-phase interleaved converter, which has the same structure as the commercially available three-phase inverter, is used. RTGC system is supplied the power from diesel-engine generator. According to power demand, engine speed is varying 20~60Hz, and voltage is varying 210Vac ~ 480Vac. When idle mode or low power operation dc/dc converter operates by constant output voltage control. The perpormance of converter is evaluated through several experiments with a real RTGC. Proposed system can cut down fuel consumption by 36% at idle mode operation.

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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.

Speed Control of a Diesel Engine Generator by a Electric Governor (전기식 조속기를 이용한 디젤 엔진 발전기의 속도 제어)

  • Lee, Seung-Hwan;Lee, Joon-Hwan;Sul, Seung-Ki
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.452-454
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    • 2008
  • 본 논문에서는 실험적으로 구한 엔진 토크 참조 표를 이용하여 엔진의 비선형 모델을 구하고 이를 각각의 운전 점에 대해 선형화한 엔진 모델을 제시하였다. 이러한 선형화된 엔진 모델을 이용하여, 전기식 조속기를 사용한 디젤 엔진의 속도 제어에 있어 발생하는 안정성 문제를 해석하였다. 제시한 디젤 엔진 모델을 이용하여 속도제어기의 비례, 적분 미분 이득을 설정하고 이 값을 바탕으로 모의실험 및 실험을 통하여 제시한 모델의 타당성을 검증 하였다.

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Experimental Investigation of Collision Mechanisms Between Binary Droplet of Fuel Jet (연료 제트의 두 액적간의 충돌기구에 관한 실험적 연구)

  • Lee, Keun-Hee;Kim, Sa-Yop;Lee, Chang-Sik
    • Journal of ILASS-Korea
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    • v.13 no.4
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    • pp.187-192
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    • 2008
  • In this study, the mechanisms of binary droplet collision were studied with diesel, ethanol and purified water. The droplet collisions of liquid droplet have been investigated for the same droplet diameter. In order to obtain the digital images of the droplet collision behavior, the experimental equipment was composed of the droplet generating system and the droplet visualization system. The droplets were produced by the vibrating orifice monodisperse generator. The visualization system consisted of a long distance microscope, a light source, and a high speed camera. The outcomes of binary droplet collision can be divided into four regimes, bouncing, coalescence, reflexive separation and stretching separation. The impact angle and the relative velocity of binary droplet are main parameters of collision phenomena, so the transition mechanism of droplet collision can be divided by the impact parameter.

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An experimental study on the impingement spray of a common-rail diesel injector (2) -atomization characteristics- (커먼레일식 디젤 인젝터의 충돌 분무에 대한 실험적 연구(2) -미립화 특성-)

  • Lee, C.S.;Park, S.W.;Seo, S.H.
    • Journal of ILASS-Korea
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    • v.8 no.3
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    • pp.19-26
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    • 2003
  • In this study, experimental study on atomization characteristics of the fuel spray impinging on the wall was at different wall distances and angles of wall inclination. The fuel injection system was composed based on the common rail system. and the injection signal was synchronized by the delay generator. The atomization characteristics of the injected spray were analyzed in terms of the SMD and velocities which were measured by using the phase Doppler particle analyzer system. It is revealed that the free spray is atomized actively above 50mm form the injector tip. In the cases of the impinged spray, the 5MD and velocity of the impinged spray are smaller than those of the free spray. The impinged spray has the maximum near the 35mm of the radial distance from the injector axis, and the atomization performance is enhanced with the decrease of the wall distance.

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Structural Design and Analysis of Connecting Part for Vertical Wind Turbine System Blade

  • Park, Hyunbum
    • Journal of Aerospace System Engineering
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    • v.14 no.2
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    • pp.44-49
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    • 2020
  • This work is intended to develop a flapping-type vertical wind turbine system that will be applicable to diesel generators and wind turbine generator hybrid systems. In the aerodynamic design of the wind turbine blade, parametric studies were performed to determine an optimum aerodynamic configuration. After the aerodynamic design, the structural design of the blade was performed. The major structural components of the flapping-type wind turbine are the flapping blade, the connecting part, and the stopper. The primary focus of this work is the design and analysis of the connecting part. Structural tests were performed to evaluate the blade design, and the test results were compared with the results of the analysis.

A Vibration Mode Analysis of Resilient Mounting System and Foundation Structure of Acoustic Enclosure using Finite Element Method (유한요소법을 이용한 음향차폐장치용 탄성마운트 시스템 및 받침대의 진동모드 해석)

  • 정우진;배수룡;함일배
    • Journal of KSNVE
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    • v.9 no.3
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    • pp.493-501
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    • 1999
  • The vibration modes of resilient mounting system and foundation structure which support diesel engine/generator set and acoustic enclosure walls play an important role in the vibration transmission process. So, it is necessary to perform vibration mode analysis of resilient mounting system and foundation structure. For some reasons, if the vibration modal analysis of resilient mounting system and foundation structure of acoustic enclosure could be simultaneously done by finite element method, it would be very efficient approach. In this paper, vibration modal analysis method using finite element method for multi stage mounting system having n d.o.f model was proposed. Vibration analysis of single and double stage resilient mounting system was performed to verify the validity of the proposed method. Also frequency response results were compared in case of rigid foundation model and finite element foundation model which was compared with experimental modal analysis results.

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Simplified Wind Turbine Modeling and Calculation of PCC Voltage Variation according to Grid Connection Conditions (간략화된 풍력발전기 모델링과 계통연계 조건에 따른 PCC 전압 변동량 계산)

  • Im, Jl-Hoon;Song, Seung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2402-2409
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    • 2009
  • This paper proposed a simple and helpful analysis model of voltage variation in order to predict the voltage variation at PCC (Point of Common Coupling), when a wind turbine is connected in an isolated grid. The PCC voltage flucuates when the wind turbine outputs active power to an isolated grid. This voltage variation is proportional to the product of the line impedance from the ideal generator to the PCC and the wind turbine output current. And It is different according as where wind turbine is connected. To solve the problem of voltage variation, this paper proposed the reactive power control. To verify the proposed analysis model, this paper utilized PSCAD/EMTDC Simulation and the field measurement data of the voltage variation during the wind power generation.

Development of Excitation System for Class 1E (Class 1E용 여자시스템 개발)

  • Shin, Man-Su;Lee, Joo-Hyun;Ryu, Ho-Seon;Lim, Ick-Hun;Jeong, Tae-Won
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1953-1954
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    • 2008
  • The excitation system for class 1E has been developed to apply to the nuclear power plant emergency diesel generator by utilizing the existing digital excitation system. The additional mission was to evaluate the excitation system of safety. It is the safety analysis of the excitaton system, the verification test, the aging test, the safety requirement test and so on. The verification test is classified of hardware and software part for detail.

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