• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.12
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• pp.2190-2195
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• 2011

Due to enhanced demands on quality, security and reliability of the electric power energy system, a microgrid has become a subject of special interest. In this paper, output characteristics of energy storage system (ESS) with an electric double layer capacitor (EDLC) and battery energy storage system (BESS) of a renewable energy based microgrid were analyzed under grid-connected and islanded operation modes. The microgrid which consists of photovoltaic and wind power turbine generators, diesel generator, ESS with an EDLC, BESS and loads was modeled using real time digital simulator. The results present the effective control patterns of the microgrid system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2002.11a
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• pp.277-279
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• 2002

This paper is an experimental research of the design of a cell battery charger using switching methods. The developed charger in this paper can do both the equalizing current charge and floating charge. Also, it is easily transferable. Power MOS FET was used for the full bridge converter of the charger, and ZVS was applied for the switching method of the converter. Also, Customized IC was used for the control circuit in order to simplify ZVS mode. The setting current and floating current used for the charger were designed by using OP AMP. Based on the process provided by the current research, a sample converter with the power rating of 5KVA was developed and is field-testing to improve its validity and stability.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.253-254
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• 2012

본 논문은 부스트 컨버터를 이용한 배터리 시험장치의 방전 전력 재사용 방법에 관한 것이다. 제안된 배터리 시험 장치는 테스트 배터리의 성능 시험을 위한 배터리 방전 시 보조 배터리에 전력을 방전하고, 충전 시 보조 배터리의 전력을 재사용 할 수 있도록 설계하였다. MATLAB의 일반적인 배터리 모델링을 이용한 충 방전 테스트 시뮬레이션으로 제안된 방법의 타당성을 확인하였다.

• Journal of international Conference on Electrical Machines and Systems
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• v.1 no.2
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• pp.111-115
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• 2012

In this paper, a solar energy powered bicycle linked to a wireless sensor network (WSN) which monitors the transfer of solar energy to an electrical energy storage unit and an analysis of its effectiveness is proposed. In order to achieve this goal, a solar-powered bicycle with an attached ZigBee and a far-end wireless network supervisory system is setup. Experimental results prove that our prototype, solar energy powered bicycle, can achieve enough solar energy for charging a two lead-acid battery pack. As a result, the user, through use of a wireless network in the parking period can be kept aware of the data on the amount of immediate solar radiation, the degree of illumination, the ambient temperature, and electrical energy storage capacity information of the bicycle through an internet interface.

• Fire Science and Engineering
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• v.14 no.1
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• pp.22-26
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• 2000

Emergency lamp is installation usage on an emergency situation or firing. It's an offer at least of brightness. It's lighting to common source usually. It's transferred to reserve battery on power stoppage. This emergency lamp is lighted from solar cell system. The solar cell should be operated at the maximum power point. This paper proposes the new control method that half-bridge inverter using the solar cell can operate emergency lamp.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.959-965
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• 2009

To meet the demand increasing passengers in railway vehicles, railway transportation service companies are increasing the numbers of cars per train-set. Two solutions, Variable train-set formations and Multiple train-set operation, are common way to increase the transportation capability. These kind of long distance train-set can effect train-set command and control system, and sometimes the digital signals using train line from master cabin can not reach to the systems located the other extremity slave car. This is so called Voltage Drop. This phenomenon is originated from the electrical power consumption and electrical cable resistance, and cause to the equipments or cars located end of the electrical cable way, malfunction or abnormal operations. This voltage drop happens not only in train lines but also Battery Power Lines. The purpose of this investigation is to design high reliability railway vehicles by clarifying the possibility of happening these events case by case, by analyzing the reasons, and finally by finding the best solutions.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.48 no.11
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• pp.663-669
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• 1999

This paper presents new self excited DC-DC converters such as Buck-boost type, Buck type and also non-inverting Buck-boost type. The proposed converters has the following advantages: simple topology, small number of circuit components, easy control method. Therefore, these converters are suitable for the portable appliances with battery source. It is especially suited for low power DC-DC conversion applications where non isolation output power is usually required. The steady state characteristics of proposed self exciting Buck-boost DC-DC converter are analysis and the result shows good agreement with experimental value. Furthermore the experimental results for 50W class self oscillating Buck-boost DC-DC converter have been obtained, which demonstrate the high efficiency and good performance.

• Proceedings of the KIEE Conference
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• 2001.10a
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• pp.337-339
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• 2001

High speed brushless permanent magnet (PM) machines are a key technology for electric drives and motion control systems for many application, since they are conductive to high efficiency, high power density small size and low weight. Proposed slotless PM machine is constructed without stator winding slots. Its stator magnetic material is in the form of a ring and winding have a toroidal configuration and its rotor consists of a 4-pole Halbach array or radially magnetized PM rotor.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.334-335
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• 2020

본 논문에서는 레이저 광원을 적용한 무선전력전송 시스템에 적용되는 PV 모듈의 출력 특성을 분석하고, PV 모듈로부터 최대 전력을 발생시키면서 배터리를 충전시킬 수 있는 컨버터 개발 결과를 제시한다. 먼저, 특정 파장에서 최대전력이 발생되도록 개발된 PV 수신모듈에 레이저 빔을 조사하였고, 레이저에 공급되는 전력 크기에 따른 PV 모듈의 전압-전류의 특성 데이터를 확보하였다. 전압/전류 특성 데이터로부터 PV 수신모듈의 소신호 저항을 분석하였고, 이를 컨버터 회로모델에 적용함으로써 제어기 설계를 위한 시스템의 전달함수를 유도하였다. 이로부터 레이저 일사량에 따른 전류원/전압원 전영역에서 PV 모듈의 입력전압을 안정적으로 제어할 수 있는 제어기를 설계함으로써 레이저 수신용 PV 모듈이 최대 전력을 발생시킬 수 있도록 하였다. 본 논문에서 제안된 방법은 MCU 제어기반 25W급 배터리 충전용 부스트 컨버터의 프로토타입 제품을 통해 실험 검증되었다.

• Journal of Advanced Navigation Technology
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• v.26 no.1
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• pp.35-45
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• 2022

In this paper, we modeled the devices used easily in PV system circuits. In addition, for full operation of the photovoltaic system, a complete operation system for the DC-DC buck-boost converter and the MPPT control system was modeled and simulated to confirm good operation. we were constructed an actual system with the same conditions in the simulation and experimented. The purpose is to confirm the stable power supply through the load leveling by presenting the PCS considering ESS of photovoltaic power generation. we will do study to apply hybrid capacitors that have high energy density to the same size compared to the EDLC to DVR. As a result, we proposed a single-phase 3 kW grid-connected solar power converter.