• The Transactions of the Korean Institute of Power Electronics
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• v.19 no.4
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• pp.303-311
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• 2014

This paper shows the test result of 2MVA BESS(Battery Energy Storage System) with wind-turbine in micro-grid of the Gapado. To implement of micro-grid with BESS, characteristics of generator and customer load in grid are considered. Also, to operate of 2-parallel PCU(Power Conversion Unit) in BESS, the droop control is adopted with operating mode of grid independent. Performances of BESS with wind-turbine were verified by analysis of power quality such as voltage harmonics, ratio of voltage and frequency regulation, and by measurement of waveform such as output voltage and current.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.323-324
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• 2012

최근 전력의 공급신뢰도의 하락으로 인하여 기존 송배전 설비의 신규건설 및 유지보수를 위한 투자의 필요성이 더욱 증대되고 있다. 이에 적절한 대안으로서 배터리를 이용한 에너지 저장 시스템(BESS, Battery Energy Storage System)이 대두되고 있다. 본 논문에서는 송배전 설비 투자 지연을 위한 BESS의 필요성에 대해 살펴보고 그 핵심 구성 요소인 PCS의 기능과 최신 동향에 대해 기술한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.587-596
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• 2021

Naval battleships have systems to perform special purposes, such as the Command and Fire Control System (CFCS). Some of the this equipment should be equipped with an Uninterruptible Power System (UPS ) to ensure operational continuity and the backup of important data, even during unexpected power outages caused by problems with the ship's power generator. Heavy combat losses can occur if the equipment cannot satisfy the function. Therefore, it is important to design a stable UPS. The battery and Battery Management System (BMS) are two of the most important factors for designing a stable UPS. A power outage will be encountered if the battery and BMS are not stable. The customer will be exposed to abnormal situations, loss of important tactical data, and inability to operate some of the CFCS. As a result, an enhanced safety system should be designed. Thus, this study implemented and verified the improved system in terms of three methods, such as comparative analysis of the batteries, improvement about leakage current of the circuit, and tests of the aggressive environmental resistance to improve the UPS for CFCS.

• The Transactions of the Korean Institute of Power Electronics
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• v.18 no.5
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• pp.443-447
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• 2013

This paper deals with LLC resonant converter of on-board charger for electric vehicle charging. Generally, the on-board charger must have a very widely charging voltage, higher efficiency, higher power factor, lower volume and lower weight. For reducing the switching losses, voltage and current stress of the device, the on-board charger is apply the half-bridge LLC resonant converter topology. To have a wide voltage range, it is design the hardware parameters and determine the switching frequency range of the LLC resonant converter. The experimental results show a wide charge voltage.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.10a
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• pp.625-626
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• 2012

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5443-5449
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• 2011

Battery post clamp has the role to fix each of terminals at electric condenser by connecting with the cable of power source. In this study, optimum design was achieved by reducing the material cost and the weight of vehicle with one part of battery post clamp. Stress and displacement were obtained by optimizing with design variables. The advanced model by the design through this study were compared with the original model. These optimum values can be applied usefully with the manufacturing field of battery component.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.955-956
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• 2011

본 연구의 목적은 전기 자동차 BDU(Battery Disconnected Unit)의 방열 설계를 위해 전기 및 열 등가회로를 설계하여 온도 특성을 파악하는 것이다. 이 온도 특성을 분석하기 위해서 해석 프로그램으로 매트랩(matlab)의 시뮬링크(simulink) 프로그램을 사용하였으며, 각 소자에서의 발열과 최대 온도 그리고 평균 온도의 해석 값을 통해 실험결과 데이터와 접목 시킨다면, 배터리 팩(battery pack)의 핵심 부품인 BDU의 최적 방열 설계를 이룰 수 있을 것으로 판단된다.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.83-84
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• 2013

최근 국내에서 진행중인 스마트 그리드(Smart Grid) 사업 분야에 속해 있는 스마트 운송(Smart Transportation) 사업의 하나로 전기차 운영이 핵심이 되어 진행이 되고 있다. 그러나 실제적으로 전기차를 원활히 운영하기 위해서는 극복해야 할 여러 문제가 있으며 대표적으로 주행 거리를 좌우하는 배터리 용량 문제와 고객이 어디서든 전기차를 사용하고 충전하는데 불편이 없을 만큼 충분한 충전 인프라 구축 문제가 있다. 충전 인프라는 현재, 완속 충전기와 급속 충전기로 구성되어 있으나 본 논문에서는 완속 충전기에 한정하여 서술하였고 인프라 구축에 있어 표준화 일환으로 미국자동차기술학회에서 제시하는 SAE-J1772 규격에 맞추어 개발한 자사의 완속 충전기에 2012년 독일과 미국의 자동차 업체 주도로 발표된 국제표준(ISO/IEC 15118, Vehicle-to-Grid Communication Interface) 기술 규격이며 향후 충전 인프라에 적용 예상이 되는 PLC 통신 방식을 적용한 완속 충전기 개발에 관하여 소개하도록 하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.17 no.2
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• pp.174-181
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• 2012

Energy storage system connected to the grid has two functions such as the surplus power of a grid is stored in batteries or the energy stored in batteries will supply to the grid when the grid needs. The battery energy storage system consist of power condition system (PCS) for power supply and battery conditioning system (BCS). Lithium-ion batteries are mainly used. In this paper, the battery energy storage system connected to the grid described. The configuration of the 2MVA class power control system using water cooling and battery system are presented. And control method for the system and the output filter design method are proposed. Experimental verification of the proposed system is provided with 2MVA PCS and 500kWh BCS.

• Resources Recycling
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• v.31 no.4
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• pp.3-11
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• 2022

Owing to the increasing demand for electric vehicles (EVs), appropriate management of their waste batteries is required urgently for scrapped vehicles or for addressing battery aging. With respect to technological developments, data-driven diagnosis of waste EV batteries and management technologies have drawn increasing attention. Moreover, robot-based automatic dismantling technologies, which are seemingly interesting, require industrial verifications and linkages with future battery-related database systems. Among these, it is critical to develop and disseminate various advanced battery diagnosis and assessment techniques to improve the efficiency and safety/environment of the recirculation of waste batteries. Incorporation of lithium-related chemical substances in the public pollutant release and transfer register (PRTR) database as well as in-depth risk assessment of gas emissions in waste EV battery combustion and their relevant fire safety are some of the necessary steps. Further research and development thus are needed for optimizing the lifecycle management of waste batteries from various aspects related to data-based diagnosis/classification/disassembly processes as well as reuse/recycling and final disposal. The idea here is that the data should contribute to clean design and manufacturing to reduce the environmental burden and facilitate reuse/recycling in future production of EV batteries. Such optimization should also consider the future technological and market trends.