• 대한조선학회논문집
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• 제61권1호
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• pp.19-28
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• 2024

Environmental regulations are becoming more stringent in response to climate change, especially concerning marine pollution caused by ship emissions. Large ships are adjusting by integrating technologies to reduce pollutant emissions and transitioning to eco-friendly fuels such as low-sulfur oil and LNG. However, small ships face space constraints for installing LNG propulsion systems and the risk of power depletion with pure electric propulsion. Consequently, there's growing interest in researching hybrid propulsion methods that combine electricity and diesel for smaller vessels. Hybrid propulsion systems utilize diverse energy sources, requiring an effective method for evaluating their efficiency. This study proposes employing Bond graph modeling to comprehensively analyze energy dynamics within hybrid propulsion systems, facilitating better understanding and optimization of their efficiency. Modeling of the ship's energy system using Bond graphs will be able to provide a framework for integrating various energy sources and evaluating their effects.

• 한국군사과학기술학회지
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• 제8권3호
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• pp.18-23
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• 2005

Ships have been propelled and maneuvered by electrical drives since trle late seventies. Recently, rare earth PMs allow the design of brushless motors with very high efficiency over a wide speed range. This is the most important factor in ship propulsion technology. Several types PM motors have been developing for ship propulsion system. However these have disadvantage such as cogging torque. It causes an undesired effect that contributes to output ripple, vibration, and noise of machine. Therefore several techniques may be adopted in designing PM motor in order to reduce the cogging torque. This paper describes cogging torque receding methods such as adjusting arigap length, magnet arc, and magnet thickness. That are analysed by using the finite element method(FEM) and the maxwell stress tensor method.

• 전기학회논문지
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• 제64권7호
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• pp.971-977
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• 2015

The electric propulsion system requires more reliability and safety than the conventional propulsion system because any sudden changes of electric system would bring tremendous effects on the ship's safety and propulsion. So it is very important to consider the potential transient effects. This paper discusses one of the worst electric accident. That is, one or two of generators are out of service in normal seagoing condition. And the appropriate measures are simulated in order to prevent the frequency decline that can bring the other generator's tripping. In addition, the relation between the transient effects and the major factors(inertia of generator/motors, governor's drooping characteristic and response speed) are also identified using the ETAP software.

• Journal of Advanced Marine Engineering and Technology
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• 제32권4호
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• pp.596-602
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• 2008

The cooling system is one of the most concerning factor for the reliability of the electric propulsion ship. Generally, a drive system operation in higher temperature decreases the device's reliability and power efficiency. The management of power loss and temperature of switching devices is indispensable for the reliability of the power electric system. In this paper, the switching devices are molded by IGBT, and the propulsion system is consisted of MIIR(Motor with Inverter Internal to Rotor). The system composition interacts with each other to calculate the loss and temperature of device. The calculation result is used for modeling and designing of the control and monitoring system for the electric propulsion system.

• Journal of Advanced Marine Engineering and Technology
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• 제36권7호
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• pp.942-947
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• 2012

As electricity has been used in ship's propulsion, it is necessary to increase the system voltage and current for the electrical distribution system. So it is required to improve the system safety and efficiency, the power stability, the efficiency of the generation through various analysis of ship's electric power system. In this paper, the electrical service reliability of the power distribution system of semi submersible drilling rigs has been analysed and discussed using ETAP.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2005년도 전기학술대회논문집
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• pp.1113-1119
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• 2005

The power electric system is one of the most concerning factor for the reliability of the electric propulsion ship. operation in higher temperature decreases the device's reliability and power efficiency. the management of power loss and temperature of switching devices is indispensable for the reliability fo the power electric system. In this paper, IGBT chip of the switching devices is modeled and MIIR(Motor with Inverter Internal to Rotor)type of the propulsion motors is used. these parts interact with each other to calculate the loss and temperature of device. calculated Results is modeled and designed of the control and monitoring system for the electric propulsion system.

• 한국수소및신에너지학회논문집
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• 제35권2호
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• pp.230-239
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• 2024

Efforts are being made to replace ship diesel engines with electric propulsion motors in response to emission regulations. In particular, in the case of short-range small ships, research is being conducted to replace polymer electrolyte membrane fuel cells (PEMFC) with power sources. However, PEMFC has problems such as slow dynamic response characteristics and reduced durability at high temperatures. To solve this problem, a high-precision ship model was developed with power distribution and thermal management strategies applied, and through this, the required power, heat, and power characteristics of the propulsion system according to the ship's speed profile were analyzed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.632-634
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• 2001

Recently, almost cruise are manufactured with electric propulsion system. The characteristics and types of the electric propulsion motors, which is one of the most important component in electric propulsion system for ships, are examined and compared. And a trend on the recent technical development of electric propulsion motors for ships is introduced.

• 해양환경안전학회지
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• 제23권1호
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• pp.67-72
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• 2017

본 연구는 융복합기술을 사용하여 국내 자동차 산업의 배터리 및 전기시스템과 수상레저기구 중 접근이 용이한 수상오토바이를 결합하여 전기 동력 추진식 수상오토바이 개발과 전기 동력 추진식 수상오토바이 실용화를 위한 등록 및 제작을 위해 전기 동력 추진식 수상오토바이의 안전검사 기준(안)과 형식승인 기준(안)을 개발하였다. 전기 동력 추진식 수상 오토바이 인증기준은 기존 내연기관 동력 수상오토바이의 인증기준과 선박 전기 시스템과 관련된 인증기준을 기본으로 구조 및 시스템 설치 안과 전기시스템 안의 두 분류로 구분을 하였고, 최종적으로 안전검사 기준(안)과 형식승인 기준(안)으로 개발하였다. 안전검사 기준(안)의 내용은 총 7개의 범주로 구분되어 수상오토바이의 안전한 운행을 위한 설비의 확인을 목적으로 작성되었고, 형식승인 기준(안)은 총 7개의 범주로 구분되어 수상오토바이의 안전한 제작을 위한 목적으로 작성되었다. 본 연구를 통해 국내 친환경 수상오토바이 제작의 환경 조성과 전기동력 추진 선박의 인증기준에 대한 정책 수립 기초 자료로 활용이 가능하다.

• 한국정보통신학회논문지
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• 제24권9호
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• pp.1202-1208
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• 2020

현재 4차 산업혁명 시대에 발맞춰서 선박 분야에서는 인공지능 요소를 접목하여 미래를 대비하여야 한다. 그리고 자율운항 선박 등장에 대한 전력관리 분야에서도 이에 대한 대응이 필요하다. 본 연구에서는 머신러닝의 DNN(Deep Neural Network)을 이용한 배터리 연동형 전력관리시스템(BLPMS, Battery Linked Power Management System) 알고리즘을 제안한다. 실험을 위하여 LabView를 통한 선박 데이터를 바탕으로 운항모드별 선박 전력소비량의 패턴을 학습하고 Python을 통해 배터리의 상태를 도출하여 발전기와 배터리의 연동의 유연성을 확인하였다. 실험의 결과 배터리의 충·방전을 통해 발전기의 저부하 운전이 감소되고, LNG의 1%의 연료소모량 감소를 통하여 경제성 및 신뢰성을 확인하였다.