• 한국정보통신학회논문지
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• 제26권6호
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• pp.914-921
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• 2022

국제해사기구는 친환경규제로 2008년 대비 2050년까지 선박의 이산화탄소 배출량을 70%, 온실가스 배출량을 50% 줄이겠다는 목표를 세웠다. 선주 및 조선소에서는 이를 만족하기 위한 방법으로 LNG추진, 암모니아추진, 전기추진, CO₂포집, 샤프트 제너레이터 등 다양한 연구개발을 추진하고 있다. 이중 샤프트 제너레이터는 개조공사를 통해 기존선에 바로 적용가능한 장점이 있다. 본 논문에서는 기존선에 샤프트 제너레이터를 적용함으로 얻을 수 있는 총 연료 감소율을 시뮬레이션을 통해 검증하였다. 이를 위해, 중형선의 크기를 정의하고, 조속기, 디젤엔진, 프로펠러, 토크 스위치, 샤프트 제너레이터용 발전기와 추진전동기, 선박모델 등에 대해 모델링하고 시뮬레이션하였다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.216-219
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• 2021

친환경선박법에서 샤프트제너레이터(shaft generator)는 친환경선박 해당 기자재로 정부와 선주의 높은 관심을 보이고 있다. 하지만, 선박에서 신기술을 적용하기 위해서는 높은 신뢰성을 요구하고 있으며, 이를 위한 검증 방법으로 HILS(hardware in loop system)테스트를 사용한다. 이에, 본 논문에서는 샤프트제너레이터를 적용한 터그보트의 HILS 테스트를 위해, 샤프트제너레이터를 모델링하고 시뮬레이션 하였다. 시뮬레이션을 통해, 시나리오에 따라 샤프트제너레이터의 충방전이 동작하는 것을 검증하였다.

• Journal of Power Electronics
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• 제16권1호
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• pp.259-267
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• 2016

This paper presents a stand-alone variable speed constant frequency (VSCF) ship shaft generator system based on a brushless doubly-fed machine (BDFM). In this system, the output voltage amplitude and frequency of the BDFM are kept constant under a variable rotor speed and load by utilizing a well-designed current vector controller to regulate the control winding (CW) current. The control scheme is proposed, and the hardware design for the control system is developed. The proposed generator system is tested on a 325 TEU container vessel, and the test results show the good dynamic performance of the CW current vector controller and the whole control system. A harmonic analysis of the output voltage and a fuel consumption analysis of the generator system are also implemented. Finally, the total efficiency of the generator system is presented under different rotor speeds and load conditions.

• Journal of Electrical Engineering and Technology
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• 제1권2호
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• pp.177-184
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• 2006

In this paper a new dc-link type wind turbine generator system using a shaft generator system, which is widely used for power sources in a ship, is proposed. The basic configuration of the proposed wind turbine generating system is first explained. And the equations expressing the system are derived. Then the steady-state characteristics of the generating system are discussed. We use an experimental system that can simulate the characteristics of a wind turbine in this study, because it is hard to operate an actual wind turbine in a laboratory. In addition, the transient responses of this system are investigated when the velocity of the wind is changed. It is shown that experimental results were very close to the simulated ones, supporting the usefulness of the theory.

• Journal of Advanced Marine Engineering and Technology
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• 제31권8호
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• pp.998-1004
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• 2007

Connecting a synchronous generator to a power system is a dynamic process, requiring the coordinated operation of many components and systems. The goal is to connect the oncoming generator to the system smoothly i.e without causing any significant bumps, surges, or power swings, by closing the ACB when the oncoming generator matches the power system in voltage magnitude, phase angle, and frequency. If oncoming generator voltage is not matched to the power system voltage, reactive power will flow either into or out of the system at the instant of ACB closure. If this voltage difference is too great, the reactive power flow may result in high transient stresses that could damage the windings of the generator. Also, if oncoming generator frequency is not matched to the power system frequency, transient power will flow between generator and power system. If the frequency difference is too great, the transient power flow is reflected into the prime mover shaft, and this may result in excessive shaft or coupling stress. This paper tries to prove the necessity of correct synchronization for ship generators through a transient phenomenon analysis.

• 한국소음진동공학회논문집
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• 제27권1호
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• pp.14-19
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• 2017

Fuel oil consumption cost varies depending on every ship operation and this roughly amounts to 70 % of shipping companies' total revenue. As such, efforts towards improved fuel economy are being pursued. An annual 1 % reduction in fuel consumption is perceived to result in saving tens million US dollars on the global fleet operation. One approach is the application of power take-off configurations which are seen to increase fuel oil economy and are suitable for power generation. In this study, the dynamic properties of a shaft generator coupled on a 10S90ME main engine of an 18 600 TEU container vessel is presented. The vibratory torque and angular velocity variation was examined through theoretical analysis and actual vibration measurement. The result of the study suggests a review on existing classification rules for generator design and the lowering of vibratory torque and angular velocity variation guideline.

• 한국항해항만학회지
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• 제35권9호
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• pp.749-753
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• 2011

A leisure ship has a stand-alone type power system, and a generator is in use on this condition. But the generator cannot be operated in condition of leisure activity, ocean measurement and etc, because of environment and noise. Recently, renewable energy system is connected with power system of the leisure-ship for saving energy. The renewable energy system can not supply the stable power to leisure-ship because power generation changes according to weather condition. And most of the leisure ship is operated without methodical power management system. This study's purpose is to develop SPMS(Smart Power Management System) algorithm using the renewable energy (photovoltaic, wind power and etc.). The proposed algorithm is able to supply stable the power according to operation mode. Furthermore, the SPMS manages electric load (sailing and communication equipment, TV, fan, etc.) and reduces operating times of the generator. In this paper, the proposed algorithm is realized and executed by using LabVIEW. As a result, the hour for operating the generator is minimized.

• 융합신호처리학회논문지
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• 제22권1호
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• pp.7-13
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• 2021

최근 해운산업에서는 환경규제에 대한 중요성이 높아지고 있으며, 이를 위한 산업의 요구가 급격히 높아지고 있다. 이에 샤프트제너레이터는 선박에 가장 빠르게 적용이 가능한 환경규제 대응기술로 선주의 요구가 증가하고 있다. 샤프트제너레이터는 메인추진엔진에 전동기를 설치하여, 부하환경에 따라 가변적으로 사용함으로 메인추진엔진의 연료소모율을 줄일 수 있는 장치이다. 저속에서는 모터의 힘으로 동작하고, 급격한 부하가 필요할 때에는 메인추진엔진과 모터가 함께 동작함으로 효율적인 운전이 가능하다. 본 논문에서는 MATLAB Simulink를 이용하여 터그보트의 디젤엔진과 샤프트제너레이터를 모델링하고, 시뮬레이션을 통해서 연료소모율을 검증하였다.

• 소음진동
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• 제9권5호
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• pp.936-942
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• 1999

Unstable torsional vibration on the marine ship's propulsion shafting system with diesel engine occurred due to a slippage of multi-friction clutch which was installed between increasing gear and shaft generator. In this paper, the mechanism of this vibration was verified via torsional, whirling, axial and structural vibration measurements of shafting system and noise measurement of gear box. And it was also identified by the theoretical analysis method.

• 대한조선학회논문집
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• 제41권1호
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• pp.15-22
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• 2004

Twin-skeg type stern shapes are recently adopted for very large commercial ships. However it is difficult to apply a CFD system to a hull form having twin-skeg, since grid topology around a twin-skeg type stern is more complicated than that of a conventional single-screw ship, or of an open-shaft type twin-screw ship with center-skeg. In the present study a surface mesh generator and a multi-block field grid generation program have been developed for twin-skeg type stern. Furthermore, multi-block flow solvers are utilized for potential and viscous flow analysis around a twin-skeg type stern The present computational system is applied to a 15,000TEU container ship with twin-skeg to prove the applicability. Wave profiles and wake distribution are calculated using the developed flow analysis tools and the results are compared with towing tank measurements.