• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.2
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• pp.100-106
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• 2005

This paper addressed the issue of the three-phase load flow program for electric power distribution systems that include distributed generations. The equipment models were selected in order to consider imbalances among phases for the load flow analysis of distribution systems. Also, power equations and measurement functions are newly derived. The load flow analysis program developed in this paper was tested for the propriety of algorithm and convergence characteristics by case studies on test systems in various scales and types.

• Environmental and Resource Economics Review
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• v.15 no.2
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• pp.269-296
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• 2006

With the concern of the potential problems which can be observed in terms of the power supply of renewable energies, we need to analyze the impact of additional power generation capacities of renewable energy sources on peak load. Each renewable energy sources are dependent upon wind speed, solar radiation, head differences caused by lunar calendar. Considering that these exogenous renewable energy sources follow their own stochastic distributions, we analyze the probability distribution of the impact of each renewable energy power supply on peak load. As a conclusion, we note that traditional tools used for the analysis of power supply such as capacity factors are no longer appropriate for the analysis of renewable energy sources in that perspective.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.560-562
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• 2005

90년대에 들어서면서부터 미래원천기술 개발에 필요한 양성자원 및 중성자원의 중요성이 부각됨으로써, 이에 적합한 고에너지(수백 MeV-수 GeV) 및 대전류(수십 mA)의 대형 양성자 가속기가 개발되어 반도체 생산, 의료장비 둥 여러 분야에 널리 적용되고 있는 추세이다. 본 논문에서는 이러한 양성자 가속기 연구센터에 전력을 공급하기 위한 전력설비를 구축하였다. 구축한 전력설비의 유용성을 입증하기 위하여 현재 건설중인 미국의 SNS project 및 유럽의 양성자 가속기 연구센터 전원설비와 비교 검토함으로써 본 논문에서 설계한 전력설비의 유용성을 입증할 수 있었다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.4
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• pp.130-138
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• 2008

The tendency of lightning surge to propagate is a eared variously depend on the power system and subject equipment of protection. However, looking into the subject equipment with the lightning surge, the invasion route of lightning surge can be divided in between the two lines of power, between the power line and the ground, the power line and the PE conductor, between the neutral line and the ground and the like. In addition, in the event of the communication equipment, there exists the route of lightning surge incoming from between the communication lines, the communication line and the ground in addition to the power lines. In this study, the tendency of propagation of lightning surge penetrated on to the subject equipment is analyzed through the empirical experiment in accordance with the ground method by using the independent ground, common ground and bypass arrester ground for safety improvement in power lines.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.8
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• pp.64-70
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• 2007

The electrical accident results from an insulation blackdown by over-voltage, an overheating by the excess of allowable current, a deterioration performance by the passage of time, and so on. This paper discusses how to improve the power control system of PCB in water purifier. The protecting device of present power supply control system in water purifier is composed of the varistor device which acts only for impulse-type surges. So the present system can not be protected others except the surge of impulse-type. The newly-suggested power control system in this paper is designed to protect the system by disconnecting power supply through SSR(Solid State Relay) if the value of input voltage is exceeded the setting value.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.3
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• pp.10-16
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• 2005

This paper suggested the sulfur lamp power supply using Fuzzy Gain Scheduling(FGS), which was designed and confirmed the performance through manufacturing. it was based on Series Resonant Half Bridge Inverter(SRHBI), so that was applied Pulse Frequency Modulation(PFM), Zero Voltage Switching(ZVS), soft switching and soft start for input power variation and output power compensation. In order to get the lengthened life time of magnetron and stabilized output or power, power ratter and efficiency were improved by fuzzy gain algorism. It also made it possible to get not the existing foxed output power but continuous variable output power$(900\~1250[W])$. The manufactured power supply showed good results in input power $220[V]{\pm}15[\%]$ with stabilized output of power, luminous efficiency 97[1m/W] and power factor $96[\%]$.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.77-78
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• 2013

진단용 X선 투시촬영장치는 고전압발생장치를 필요로 하며, 이에 대용량 전원설비를 갖춘 X선 고전압 발생장치의 개발이 요구되고 있다. X선 투시촬영장치는 단시간 고출력의 촬영과 장시간 저출력의 투시가 가능해야 하므로 고용량의 상용 AC 전원을 사용해야 한다. 이에 본 논문에서는 EDLC를 에너지 저장장치로 사용하여 저용량의 AC전원만으로 투시 및 촬영이 가능한 X선 투시촬영장치용 고전압발생장치를 제안한다. 에너지 저장장치를 기반으로 한 32[kW]급의 X선 투시촬영장치용 고전압발생장치를 구성하고 시뮬레이션 통하여 제안한 고전압발생장치의 효용성을 입증한다.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.1 no.1
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• pp.75-82
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• 1987

Application of conventional phase controlled power electronic circuits causes reduced power factor and increased harmonic component in the electric sources. Therefore, an Optimal PWM strategy has been investigated here in order to reduce to a large extent these effects mentioned. Optimal PWM converter has been to minimize the rms harmonic current in the sources and has been found to have a duality with Optimal PWM inverter. The voltage patterns of Optimal PWM Inverters are governed by the same switching patterns and control laws as the current patterns for Optimal PWM converter. The improvement requires switching devices having a high speed capability. While this formerly did require thyristors with force commutation circuits, today this feature is easily implemented by using power Transistor or GTOs. The control laws for minimizing the rms harmonics current in the source, the circuits and the results are shown in the paper.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.3
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• pp.132-141
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• 2007

Recently, there has been growing interest in distributed resources with high-energy efficiency due to the increasing energy consumption and environmental pollution problems. But an insertion of new distributed generation to existing power distribution systems can cause several problems such as voltage variations, harmonics, protective coordination, increasing fault current etc. In this paper, a new method of the fault location identification at the distribution system with distributed resources, which can be determined by the magnitude and direction of the fault current, is proposed. In addition, a new online protective coordination scheme of recloser-sectionalizer is proposed based on the proposed fault location identification method for distribution system with distributed resources.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.4
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• pp.8-23
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• 2004

정보화 시대로 접어들면서 빌딩은 전자화 가전기기나 전기설비들이 많이 설치되고 있다. 통신 시스템의 발달 및 보안, 방재 시스템의 발달로 빌딩들은 통신이나 신호 케이블들이 설치되어 있다. 이들 건축물과 외부의 통신회사들과도 동축케이블 등으로 연결되어 있다. 낙뢰나 과도서지가 전원 및 통신케이블을 타고 빌딩 내부로 유입되어 전자기기나 통신기기들을 파괴시키거나 오동작하는 사례가 많다. 독일의 경우 도심 빌딩에 낙뢰가 떨어진 경우 반경 3〔km〕 떨어진 건물에서 피해가 발생된 것으로 보고되고 있다. (중략)