• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.314-315
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• 2015

전력수요가 급증하면서 발전량 확보에 대한 요구에 따라 원자력 및 화력과 같은 기존 주요 발전설비로 인한 환경오염 문제에 대한 관심이 높아지고 있다. 일본 3.11 대지진과 후쿠시마 원전사고는 공급 위주의 전력에너지 정책 패러다임에 변화를 주었다. 원자력발전소 건설 규제 및 대책요구에 대한 여론이 높아짐에 따라 전력산업 전반적으로 수용가의 효율적인 에너지 사용을 포함하는 지능형 전력망(Smart Grid)과 수요반응(Demand Response) 기술이 화두가 되고 있다. 배전 시스템내의 어플리케이션 간의 정보 교환은 IEC TC-57 WG-14에 의해 IEC 61968 표준 규격으로 정의되고 Part 4인 "Records and Asset Management"에 기술된 규격에 대한 이해를 요구하고 한다. DMS와 GIS 시스템과 기존 연동하여 이러한 소규모의 마이크로그리드 시스템의 플랫폼으로 활용하도록 데이터교환 및 외부 GIS를 플랫폼으로 활용하는 통신 프로토콜을 소개하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.592-593
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• 2015

Recently, the fault current has increased to exceed the rated breaking capacity of protective device due to the growth of the power demand on the power system where is changed into the loop-, mesh-, network grid. To limit fault current, the superconducting fault current limiter (SFCL) is announced with various methods. In many researches, the current limiting effect with the SFCL has been analyzed considering the rated breaking capacity of the CB with one fault condition. However, the power system has various short circuit and operation conditions. In order to select the capacity of the SFCL with reclosing operation and burden of the fault current on the protective device, the characteristics of the power system were investigated. Through the analysis, the evaluation method of the current rate was improved.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.37-38
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• 2015

화석연료를 이용한 전력생산이 늘어날수록 이산화탄소 배출이 많아져 지구온난화에 영향을 주고 있다. 화석연료의 사용량을 줄이기 위해서는 원자력이나 수력을 이용한 방법이 사용되어 왔으나 환경과 안정성 면에서 풍력이나 태양광과 같은 신재생발전원의 사용을 확대하고 있다. 이와 같은 시도는 기상변동에 민감한 신재생발전원을 대규모로 전력계통과 연계할 경우 계통운영의 불안정성이 커지게 된다. 따라서 본 논문에서는 전력저장장치를 이용해 신재생발전을 증가시키면서 전력계통의 운영서비스를 안정적으로 할 수 있는 방안을 제시하고자 한다.

• 한국항해항만학회지
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• 제34권9호
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• pp.705-709
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• 2010

Buildings nowadays are increasingly expected to need higher and more economic performance requirements. Energy consumption in buildings accounts for over 30% of total energy use. The Building Energy Management System (BEMS) and renewable energy (RE) technologies are considered as a potential measure to improve energy efficiency and reduce use of grid-power. It is, however, a challenge to utilise the intermittent energy supply of RE in building energy systems. This paper presents an experimental study on a RE-embedded BEMS. A control algorithm for the RE-embedded BEMS was designed to maximise the utilisation of RE and eventually to reduce electrical utility bill. The proposed system is tested at a laboratorial chamber with an air conditioner, fan and heater. The contribution of RE in building energy system is discussed to this end.

• 한국통신학회논문지
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• 제14권4호
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• pp.405-411
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• 1989

LCTV를 이차원 공간 광변조기로 사용하기 위하여 성능평가 및 특성개선을 수행하였다. LCTV 스크린의 위상 왜곡은 홀로그램 기판과 굴절을 정합액을 사용해 보정하였고, 실제 사용시 문제시되는 전국 격자패턴의 제거를 위해 BaTiO3 결정에서의 위상공액파를 이용하는 새로운 방법을 제안하고 실험하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 하계학술대회 논문집
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• pp.291-292
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• 2010

The main purpose of this study is to design and develop the grid connected 4kW photovoltatic PCS(Power Conditioning System) targeting for Japanese market. To make this task, the development of DC to DC converter, one phase inverter and EMI filters, and the research on connection between inverter and utility line are made. The developed 4kW PCS has fully carried out performance verifications and evaluation works and acquired the JET(Japan Electrical Safety & Environment Technology Laboratories) certification for safety and performance.

• Journal of Power Electronics
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• 제12권2호
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• pp.276-284
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• 2012

AC/AC power conversion is widely used to feed AC loads with a variable voltage and/or a variable frequency from a constant voltage constant frequency power grid or to connect critical loads to an unreliable power supply while delivering a very balanced and accurate sinusoidal voltage system of constant amplitude and frequency. The load specifications will clearly impose the requirements for the inverter stage of the power converter, while wider ranges of choices are available for the rectifier. This paper investigates the utilization of a buck-type current source rectifier as the active front-end stage of an AC/AC converter for applications that require an adjustable DC-link voltage as well as elimination of the low-frequency common mode voltage. The proposed solution is to utilize a combination of two or more zero current vectors in the Space Vector Modulation (SVM) technique for Current Sources Rectifiers (CSR).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.178-182
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• 2002

For action selection as well as teaming, simple associations between stimulus and response have been employed in most of literatures. But, for successful task accomplishment, it is required that artificial life system can team and express behavioral sequences. In this paper, we propose a novel action-selection-mechanism to deal with behavioral sequences. For this, we define behavioral motivation as a primitive node for action selection, and then hierarchically construct a tree with behavioral motivations. The vertical path of the tree represents behavioral sequences. Here, such a tree for our proposed ASM can be newly generated and/or updated, whenever a new behavioral sequence is learned. To show the validity of our proposed ASM, three 2-D grid world simulations will be illustrated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.309-312
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• 2002

For the purpose of more effective simulation of the utility interactive WPGS(Wind Power Generation System) the SWRW (Simulation method for WPGS using Real Weather condition) is used in this paper, in which those of three topics for the WPGS simulation. user-friendly method, applicability to grid-connection and the utilization of the real weather conditions, are satisfied. The simulation of the WPGS using the real weather condition including components modeling of wind turbine system is achieved by introducing the interface method of a non-linear external parameter and FORTRAN using PSCAD/EMTDC. The simulations of steady-state and transient-state are performed effectively by the introduced simulation method. The generator output and current supplied into utility can be obtained by the steady-state simulation, and THD can be achieved by analyzing the results as well. The transient - state of the WPGS can be analyzed by the simulation results of over cut-out wind speed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.225-227
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• 2002

In this paper, novel concept of a photovoltaic(PV) power generation system adding the function of active filter(AF) is proposed. Even PV power generation system can be treated to a harmonics source for the power distribution system, it is necessary that the function of AF system in grid connected PV power generation system. Active Filters intended for harmonic solutions are expending their functions from harmonic compensation of nonlinear loads into harmonic isolation between utilities and consumer, and harmonic damping throughout power distribution system. So, the PV system combined the function of AF system can be usefully applied in power distribution system. Here, the control strategy of PV-AF system is introduced.