The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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A Study on the Adoption of Power Take Off Operation Mode and Fuel-Saving Effect in the Hybrid Electric Propulsion System for a Warship

전투함 하이브리드 전기추진 시스템의 PTO 운전모드 적용 및 연료절감 효과 연구

  • Kim, So-Yeon (Dept. of Electrical & Electronic Eng., Rep. of Korea Naval Academy)
  • Received : 2018.11.06
  • Accepted : 2018.12.10
  • Published : 2019.02.20
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Abstract

Hybrid electric propulsion systems (H-EPSs) are an intermediate step for integrated full electric propulsion warships. H-EPSs are a dynamic combination of mechanical and electrical propulsion systems to achieve the required mission performances. The system modes could adapt to meet the requirement of the various operation conditions of a warship. This paper presents a configuration and operating modes of H-EPSs considering the operation conditions of a destroyer class warship. The system has three propulsion modes, namely, motoring mode, generating mode [power take off (PTO) mode], and mechanical mode. The PTO mode requires a careful fuel efficiency analysis because the fuel consumption rate of propulsion engines may be low compared with the generator's engines depending on the loading power. Therefore, the calculation of fuel consumption according to the operating modes is performed in this study. Although the economics of the PTO mode depends on system cases, it has an advantage in that it ensures the reliability of electric power in case of blackout or minimum generator operation.

Keywords

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Fig. 1. Korea's newest frigate with Hybrid-EPS[2].

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Fig. 2. Example of destroyer class warship’s load profile for 17-days sailing.

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Fig. 3. Assumed propulsion power(DHP) for a warship.

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Fig. 4. Layout of hybrid electric propulsion system.

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Fig. 5. Power flow in propulsion mode.

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Fig. 6. Power flow in PTO mode.

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Fig. 7. Combinator curve of CPPs.

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Fig. 9. Transmission process for electrical power loadings.

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Fig. 8. Transmission process for propulsion power loadings.

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TABLE Ⅴ SYSTEM EFFICIENCIES(ASSUMPTION)

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Fig. 11. SFC characteristics of gas-turbine for propulsion and generation.

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Fig. 13. Total fuel consumption at 15knots transit mode.

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Fig. 10. Assumed total transmission efficiencies.

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Fig. 12. Fuel rate at each ship speed.

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Fig. 14. Total fuel consumption at 27knots transit mode.

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Fig. 15. Assumed ship-speed operating profile of a warship.

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Fig. 16. Total fuel consumption at each ship speed.

TABLE II TYPES OF EXISTING HYBRID CONFIGURATIONS

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TABLE I ELECTRIC POWER LOADS ANALYSIS AND CONFIGURATIONS OF GENERATOR-SETS

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TABLE Ⅲ GENERAL OPERATION MODES OF HYBRID EPS

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TABLE Ⅳ OPERATION MODES OF HYBRID EPS WITH PTO

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