• Title/Summary/Keyword: Electrical propulsion

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Electric Propulsion Naval Ships with Energy Storage Modules through AFE Converters

  • Kim, So-Yeon;Choe, Sehwa;Ko, Sanggi;Kim, Sungmin;Sul, Seung-Ki
    • Journal of Power Electronics
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    • v.14 no.2
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    • pp.402-412
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    • 2014
  • This paper proposes a novel electric propulsion system for naval ships, which consists of Active Front End (AFE) converters directly connected to battery Energy Storage Modules (ESMs). Employing the proposed AFE converters with ESMs in the power systems of naval ships can enhance the reliability and quality of the electric power. Furthermore, the fuel-efficiency of the generator can be improved by a higher loading factor of the generator and its prime movers. The proposed AFE configuration does not require an additional dedicated DC/AC converter for the ESMs. Instead of that, the AFE converter itself can control the DC link voltage and the discharging and/or charging of the ESMs. A control scheme to achieve these control objectives is also presented in this paper. The overall power system, including the generators and electrical loads of a naval ship, is implemented by a small scaled Power Hardware-In-the-Loop (PHIL) simulator. Through this experimental setup, the proposed system configuration and the power control strategies are verified. It is shown that the fuel-efficiency and transient dynamics can be improved in the normal and contingency operation modes.

Application of DC distribution IPS to a 10t Class Fishing Boat (10톤급 어선에의 DC 배전 전기 추진 선박 적용)

  • Son, Young-Kwang;Choe, Sehwa;Lee, Seung-Yong;Kim, So-Yeon;Sul, Seung-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.4
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    • pp.353-359
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    • 2017
  • To take advantage of electric propulsion, several large vessel kinds, namely, cruise vessels, icebreakers, drill ships, and warships, have been generally designed with Integrated Power System (IPS). Although most of these vessels have adopted AC distribution IPS, DC distribution IPS ships have recently emerged as a new promising technology thanks to the availability of the products related to the DC distribution system, in which the system's major advantages over AC distribution are reduced weight and fuel consumption. This paper presents the comparison results of a 10-t class fishing boat for the AC distribution and DC distribution cases. By replacing AC distribution system with DC distribution, 31-41% reduction in the weight of the electrical equipment weight and 20-25% reduction in the fuel consumption are expected.

Characteristic Analysis of Integrated Power System and Propulsion Motor Comparison for Electric Vessels According to the Driving Condition (전기추진선박의 운전조건별 전력특성 및 추진전동기 특성 비교 해석)

  • Lee, Sang-Gon;Jeong, Yu-Seok;Jung, Sang-Yong;Lee, Cheol-Gyun
    • Journal of IKEEE
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    • v.15 no.1
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    • pp.96-103
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    • 2011
  • This paper deals with the characteristic analysis of the integrated power system applied for the electric propulsion ships. This includes the electric power system modeling which is accomplished with the electric power network mainly composed of generators, switchboards, variable frequency devices, electric motors, and etc. In addition, performance comparison between the permanent magnet synchronous motor (PMSM) and the induction motor (IM) for 3.7MW ship propulsion has been done. In order to investigated the main performance of propulsion motor, a coupled model taking into account torque density, copper loss, iron loss, efficiency, power factor, and torque ripple using finite element analysis (FEA) has been employed.

Infrastructure of Propulsion Test Facility of Liquid Rocket (액체로켓 추진기관 시험설비 기반시설 고찰)

  • Cho, Namkyung;Kim, Sunghyuk;Han, Yeoungmin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.2
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    • pp.87-94
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    • 2019
  • Liquid rocket propulsion test facility should provide for the interface condition installed on the upper level system for the test article. In addition, safety provision should be provided to be ready for accident such as explosion which can be occurred during development stage. For this purpose infra-structures of test facilities must be constructed so that stable combustion test can be performed and be guard against accidents. In this article, various aspects for infrastructures of propulsion test facilities are investigated including architecture and civil engineering aspects, test stand, room arrangements, interfaces among facilities, fire-fighting facilities, electrical power facilities.

Two-dimensional Numerical Simulation of a Pulsed Heat Source High Temperature Inert Gas Plasma MHD Electrical Power Generator

  • Matsumoto, Masaharu;Murakami, Tomoyuki;Okuno, Yoshihiro
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.03a
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    • pp.589-596
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    • 2008
  • Performance of a pulsed heat source high temperature inert gas plasma MHD electrical power generator, which can be one of the candidates of space-based laser-to-electrical power converter, is examined by a time dependent two dimensional numerical simulation. In the present MHD generator, the inert gas is assumed to be ideally heated to about $10^4K$ pulsed-likely within short time(${\sim}1{\mu}s$) in a stagnant energy input volume, and the energy of high temperature inert gas is converted to the electricity with the medium of pure inert gas plasma without seeding. The numerical simulation results show that an enthalpy extraction ratio(=electrical output energy/pulsed heat energy) of several tens of % can be achieved, which is the same level as the conventional seeded non-equilibrium plasma MHD generator. Although there still exist many phenomena to be clarified and many problems to be overcome in order to realize the system, the pulsed heat source high temperature inert gas MHD generator is surely worth examining in more detail.

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A New Design on the Parallel Load Type IGBT Brake Chopper System for KTX-1 High Speed Train (KTX-1 고속전철의 병렬부하형 IGBT 제동초퍼장치 설계에 관한 연구)

  • Youn, Cha-Joong;Noh, Myoung-Gyu;Lee, Eul-Jae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.3
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    • pp.424-430
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    • 2013
  • This paper presents a new design works for the braking chopper system which is included in the propulsion system of KTX high speed train. Due to the current fed type synchronous motors used in the propulsion system, some different behaviors are shown comparing to the voltage type other chopper systems. Specially this chopper system acts either braking controlling or regenerative power controlling system with a parallel resistive load in the propulsion system. In this paper, an improved simple high power IGBT brake chopper system has proposed which is able to be replaced with an existing complicated GTO chopper system. The analytical approaches to the parallel load type current chopper system and the propper snubber circuits calculation were explained in this paper to control new chopper system. In addition, the thermal resistance of the cooling system for power dissipation of IGBT modules was calculated also. Finally several PC simulations have been done to clarify its availability.

A Study on Powering Characteristic on Speed Variation of Propulsion System of Prototype 8200 Electric Locomotive (축소형 8200호대 전기기관차 추진시스템의 속도변화에 따른 역행특성 연구)

  • Jung, No-Geon;Chang, Chin-Young;Yun, Cha-Jung;Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.10
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    • pp.1467-1472
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    • 2014
  • This paper study on powering characteristic on speed variation of propulsion system of prototype 8200 electric locomotive propulsion system through simulation modeling. For this purpose, it being applied in the field of railway IGBT (Insulated Gate Bipolar Transistor) elements are used. Converter was performed PLL (Phase-Locked Loop) control method that is used to control the phase and output voltage, and the inverter was carried an indirect vector control method to control the speed of traction motor. The results of simulation by modeling and experimental unit, we was confirmed that converter is controlled a unity power factor and output voltage by reference voltage. Also traction motor was controlled by indirect vector control and SVPWM inverter switching method very well.

The development of a propulsion system for MAGLEV vehicle (자기부상열차용 추진시스템의 개발)

  • Cho, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.637-641
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    • 1992
  • This paper presents a fundanental method to analyze and design a Single-sided Linear Induction Motor(SLIM) as a propulsion system for magnetic levitation vehicles of DAEJEON EXPO'93 in Korea. The performance characteristics of the designed SLIM are examinated by the thrust force, the normal force, the efficiency and the power factor according to the change of input frequency. The dimension of the SLIM is 1792mm long ${\times}$ 200mm width ${\times}$ 58mm high and the rated thrust is 1300 Newtons at the operating speed of 40 Km/h.

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On the Thrust force Calculation and Normal Force Reduction of SLIM for Propulsion of Vehicles (차랑 추진용 SLIM의 추력산정 및 수직력 경감에 대하여)

  • Im, Dal-Ho;Cho, Yun-Hyun;Koo, Dae-Hyun
    • Proceedings of the KIEE Conference
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    • 1990.07a
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    • pp.23-27
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    • 1990
  • This paper proposes the calculation method of the needed thrust force and the input current which are considered the end effect and the normal force effect of SLIM for the propulsion vehicles. To estaninate theperformance of SLIM, the thrust force, the normal force, the efficiency and the power factor are comput ed according to the variation of frequency and pole pitch.

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The Analysis of a TFLIM for Electro-magnetic Levitation and Propulsion (자기부상(부(浮上) 및 추진(推進) 겸용 TFLIM의 해석)

  • Jang, Seok-Myeong
    • Proceedings of the KIEE Conference
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    • 1987.11a
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    • pp.37-40
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    • 1987
  • In transverse flux linear induction motors(TFLIM), The loops of the working flux lie in planes transverse to the direction of motion. With a poly-phase primary winding, The TFLIMs has both electro-magnetic propulsion and levitation force. Thus, TFLIM a will be useful in high speed ground transportation systems. In this paper, The characteristics of a single aide TFLIM are analysed by using electromagnetic field theory.

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