• Title/Summary/Keyword: Variable engine speed drive

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DC Bus Voltage Regulation With Six-Step Operation in Maritime DC Power System (식스 스텝 운전을 이용한 선박용 DC 전력 시스템의 직류단 전압 제어)

  • Yun, Jonghun;Son, Young-Kwang;Sul, Seung-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.4
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    • pp.263-270
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    • 2021
  • Active AC/DC converters with PWM operation are utilized to regulate rectified DC bus voltage of a permanent magnet synchronous generator in the maritime DC power system. A DC bus voltage regulation strategy that exploits the six-step operation is proposed in this study. Compared with that of the PWM operation, switching loss of the converter can be significantly reduced under the six-step operation. Moreover, conduction loss can also be reduced due to the high modulation index and reduced flux-weakening current of the six-step operation. A controller is used for the proposed DC bus voltage regulation strategy to verify its validity with the simulation and experimental setup. The simulation and the experimental test results showed that the converter loss reduces to a maximum of 70% and 19%, respectively.

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.