• Proceedings of the KIEE Conference
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• 2001.04a
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• pp.202-204
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• 2001

본 연구에서는 정상상태에서 고조파 전류와 순시전압강하의 보상특성이 우수한 3상 능동형 순시 전압강하 보상기를 제안하고 있다. 제안된 시스템의 보상 알고리즘으로는 구현하기 쉽고 간단한 직접 필터법가 사용되었으며 하이브리드 직렬형 능동전력필터에 적용하였다. 제안된 알고리즘은 전원전압이 순간적으로 왜형과 sag가 발생되더라도 비선형 부하에 인가되는 전압은 일정한 정현파로 제어 가능하며 동시에 전원전류의 고조파와 기본파 무효전류도 보상 가능하다. 정상상태와 과도 상태에서 전력전자전용 시뮬레이터인 PSIM에 의해 제안된 이론의 타당성을 입증하였다.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.366-368
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• 2007

하이브리드 차량은 기존의 화석연료를 사용하는 엔진과 배터리, 초고용량 커패시터로부터 전원을 공급받는 전동기를 직 병렬 구조로 연결하여 연비를 개선하기 위해 개발되었다. 이를 위하여 가속 시 배터리와 초고용량 커패시터의 방전으로부터 전원을 공급받고, 감속 시 회생제동을 통해 다시 충전을 반복한다. 최근 배터리와 초고용량 커패시터의 용량 및 출력의 장단점을 상호 보완하고자 이중 보조 동력원에 대한 연구가 활발히 진행되고 있다. 본 논문에서는 배터리와 초고용량 커패시터의 내부 저항을 고려하여 병렬 사용하는 이중 보조 동력원 시스템에 대하여 각각의 충전용량(SOC)에 따른 운전전략을 개발하고자 한다.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.288-289
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• 2017

This study deals with output characteristics of a hybrid power generation system for a vehicle such as a crane, a fire engine, and a wingbody. The proposed method obtains the commercial AC voltage of single phase 220V/60Hz by connecting a variable speed three-phase PMSG(Permanent magnetic synchronous generator) and an AC/DC/AC power converter to PTO (Power take off) or hydraulic motor. The proposed system is fabricated and tested to demonstrate the usefulness of the proposed system.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.1-3
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• 2008

본 논문에서는 하이브리드 자동차 및 연료전지 시스템등 고승압 응용에 적합한 새로운 ZVZCS CCM 부스트 컨버터를 제안한다. 제안하는 컨버터는 CCM에서도 ZVS 턴온이 가능하며 다이오드도 ZCS 턴오프 동작으로 역방향 회복에 의한 서지가 없다. 또한 모든 소자의 전압정격과 수동소자의 부피는 기존 ZVT 컨버터에 비해 매우 작다. 메인 스위치는 듀티 제한이 없고 승압비는 기존 부스트 컨버터의 약 2배이다. 제안하는 컨버터의 동작원리를 설명하였고 이론적 해석과 시뮬레이션 및 실험파형을 통해 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.476-477
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• 2014

본 논문에서는 넓은 충전전압 범위를 갖는 전기자동차용 급속충전기를 개발하였다. 고효율을 달성하기 위해 AC/DC 컨버터 및 DC/DC 컨버터 모두 3레벨 방식을 적용하였으며 DC/DC 컨버터에 하이브리드 스위칭 기법을 적용하여 넓은 출력전압범위에서 높은 효율을 유지한다. 50kW 시작품을 통해 타당성을 검증하였으며, AC/DC 컨버터 및 DC/DC 컨버터의 정격부하 효율은 각각 98.2%, 97.1%이며 최고효율은 98.6%, 97.1%를 달성하였고, 전체시스템의 정격부하 효율은 95.3%를 달성하였다.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.21-22
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• 2015

The maximum power point of a photovoltaic array alters with changing atmospheric conditions, temperature conditions, shadow conditions, so it is required to track maximum power point. As much as MPPT(Maximum Power Point Tracking) is important in photovoltaic systems, many MPPT techniques have been developed. In this paper, several major existing MPPT methods are comparatively analyzed and novel hybrid MPPT algorithm is proposed. The proposed hybrid MPPT algorithm is developed in combination with traditional MPPT methods to complement each other for improving performance and mitigating partial shading effects. The proposed algorithm is validated by using PISIM simulation tool and experiment in 3kW system.

• Journal of Advanced Marine Engineering and Technology
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• v.41 no.3
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• pp.245-250
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• 2017

Worldwide environmental regulations have been enhanced for emission reduction of greenhouse gases and air pollutants; accordingly, some measures were prepared. Furthermore, the need for effective and reasonable energy-saving methods is growing in accordance with that for environmental pollution minimization. In the case of marine engineering, techniques for the development of eco-friendly vessels have been actively studied, including reduction of exhaust gas emissions, development of alternative fuel, and development of a new propulsion system. In this study, we presented the basic concepts and analyzed the speed, current, voltage, and output power characteristics of each operating mode, i.e., operating mode of battery, generator, and full power.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.6
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• pp.897-902
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• 2011

This study incorporates a welder and a generator as needed while using the generator to be used as a welder is to configure the system. As such, in order to offer an integrated system to prevent the rapid charging process to manage the power state information, system configuration is the most important. Ideally, the random controls the flow of charge is ideal for that. When charging is good as long as possible, less current. However, In this study, the most ideal fusion welder and generator as required by the generator or welder can be used as a system is proposed. Specifically, the damage can be caused by carelessness, so short-circuit protection, overload protection, reverse polarity protection, automatic charging system is all about, including the ability to adjust.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.1
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• pp.29-35
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• 2011

In this paper, an integrated simulation model for designing multi-agent system based DEMS (distributed energy management system) in stand-alone micro-grid system is proposed. In the design of the EMS(energy management system), the multi-agent based DEMS are more effective than conventional centralized EMS, but it is difficult to design the DEMS by general design tools for power system because of various states of a microgrid system during operation of stand-alone mode. Also, since performance test of the DEMS using a real system is inefficient, an integrated simulation model is required for designing an effective multi-agent system based DEMS. The proposed model consists of Matlab/SimPowerSystems based simulation model of the microgrid system and the Multi-agnet based DEMS designed by Matlab/StateFlow tool. In order to show the effect of the proposed model, the model outputs are analyzed for specified operation conditions.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.3
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• pp.459-464
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• 2023

The mobile house of this article is provided with stand-alone power system that uses photovoltaic energy and enables sensing and environmental monitoring. Excess power generated is stored in lithium batteries, which enable smooth operation of the mobile house even in environment in which solar energy cannot be used. The house has been designed that its systems can be operated continuously by diesel power generation even when photovoltaic energy cannot be generated due to long rainy season or heavy snow. BMS (batter management system) has been constructed for photovoltaic and power management, and monitors the charge/discharge and usage amount of photovoltaic energy. Various sensing data are recorded and transmitted automatically, and the design allows for wireless monitoring by means of computer and smartphone app. The container house proposed in this study enables efficient energy management by performing optimal energy operation in remote areas, parks, event venues, and construction sites where there is no system power source.