• Journal of the Korean Institute of Telematics and Electronics
• /
• v.5 no.3
• /
• pp.1-8
• /
• 1968

This thermcelectrie generator devices have been determined for bismuth alloys, Sb2T and AnSb containing small amounts of doping materials. The thermoeleotric matermoelectric power;$\alpha$; resistivity; $\rho$, heatconduction; k, and temperature difference between cold and hot junction was measured. Generator consisting both B T + B S and B T+S T is better efficient than others containing another thermoceuple matarials. Its efficiency is 1.42%.

• 한국신재생에너지학회:학술대회논문집
• /
• 2011.05a
• /
• pp.164.2-164.2
• /
• 2011

지구온난화에 따른 대체에너지 자원확보가 국가적으로 중요한 과제로 대두되고 있고 여러 대체에너지원 중 국내의 해양에너지는 잠재량이 매우 높다. 여러 해양에너지 중에서 빠른 흐름을 이용하는 조류발전은 서해안과 남해안에 적용하기에 적합하며 해양환경을 보존하면서 많은 에너지를 생산할 수 있는 장점이 있다. 조류발전에서 1차적으로 에너지를 변환시키는 로터는 주요한 장치중의 하나로 여러 변수에 의해 그 성능이 결정된다. 로터의 블레이드 수, 형상, 단면적, 허브, 직경 등 여러 요소를 고려하여 설계되어야 한다. 또한 조류발전을 적용하는 해양환경에서 최대 출력을 생산할 수 있는 로터가 적용될 수 있도록 블레이드의 후류 영향을 고려해야한다. 본 논문에서는 날개요소이론을 바탕으로 수평축 조류발전 터빈을 설계하여 실험 및 유동해석을 통해 성능을 평가하고, 후류에 미치는 영향을 분석하였다.

• Proceedings of the KAIS Fall Conference
• /
• 2012.05b
• /
• pp.541-544
• /
• 2012

화석연료 고갈로 인해 전기자동차의 발전이 이루어지면서 현재 무선충전용 급집전 시스템 개발을 통하여 이 시스템의 확산 및 보급에 필요한 기반시설 및 구축의 경제성확보가 중요한 실정이다. 이에 무선전력전달의 운용방식의 발전에 따라 차량의 급전부 및 전기설비 구축이 중요한 요소로 대두되고 있다. 하지만 수변전부에서 급전부까지의 전력공급 및 전기설비에 대한 협조체계가 없어, 이에 본 논문에서는 급전부에 전력전달시 발생되는 전압강하를 분석하고 무선 전력전달방식에서 고압측에서 발생되는 각종 지락사고 및 단락사고를 해석하여 문제점분석을 통해 안정적인 전력전달방식을 구축하고자 한다.

• Proceedings of the KIPE Conference
• /
• 2004.07a
• /
• pp.265-268
• /
• 2004

교류 전동기의 전류 제어 특성은 전동기의 재정 수의 특성, 전류 제어기의 구성 및 제어 주기, PWM기법 및 주파수에 의해 달라지며, 시스템의 동적 특성 및 효율에도 큰 영향을 미친다. 본 논문은 PMSM(Permanent magnet synchronous motor)의 동기좌표계에서 벡터 제어 시 전류 제어 특성을 분석할 수 있는 실제와 동일한 디지털 전류 제어기 및 SVPWM(Space Vector PW)을 포함한 시뮬레이터를 구현하였으며 고속 및 일반 PMSM을 대상으로 시뮬레이션을 수행하여 그 결과 전류 제어 특성의 예측 가능함을 보였다.

• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.1334-1339
• /
• 2004

This paper proposes transformerless power conversion system consisting of a single-phase diode rectifier and a shunt hybrid filter for the electric-railway system. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multi-level inverter. Compared with conventional active filters. Transformers are not used. Also, LC filter works as not only a harmonic filter tuned at the 5th harmonic frequency but also a switching-ripple filter. The rating of the active filter can be decreased by using a NPC type multi-level inverter. The simulation results confirm the validity of the system.

• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.1427-1432
• /
• 2004

This paper proposes transformerless power conversion system consisting of a single-phase diode rectifier and a shunt hybrid filter for the electric-railway system. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multi-level inverter. Compared with conventional active filters. Transformers are not used. Also, LC filter works as not only a harmonic filter tuned at the 5th harmonic frequency but also a switching-ripple filter. The rating of the active filter can be decreased by using a NPC type multi-level inverter. The simulation results confirm the validity of the system

• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.1482-1485
• /
• 2004

Electrostatic Precipitators have been used widely in industry, and play an important role in environmental protection. Electrostatic Precipitators (ESP) can be operated with a high collection efficiency and low pressure drop. Pulse energization is a technique to cope with high resistivity dust, and this results in lower power consumption. In this paper, Pulse energization ESP to use subway station air clean in subway station, design and test a pulse power supply for ESP.

• Proceedings of the KIEE Conference
• /
• 2002.07a
• /
• pp.172-174
• /
• 2002

This paper proposes a new methodology for adequacy evaluation of composite power system considering an ambiguity of overload of transmission lines. Nodal arrival powers under considering an ambiguity of overload of transmission lines can be evaluated using the proposed method. Fuzzy set theory has been used in order to consider the permission level of overload of transmission lines. The problem of adequacy evaluation has been formulated using fuzzy linear programing. The effectiveness of the proposed method considering permissible overload of transmission lines has been demonstrated on the IEEE RTS.

• Proceedings of the KIEE Conference
• /
• 2000.11a
• /
• pp.82-84
• /
• 2000

This paper deals with a evaluation algorithm of interruption cost in distribution systems in the case where Dispersed Storage and Generation (DSG) systems are interconnected with the distribution systems. If DSG systems are operated as the function of the load levelling in distribution systems at the normal conditions and as the uninterruptible power supply in fault areas at the emergency conditions, the reliability improvement of the distribution systems can be expected. In other words, the benefit can be represented by the cost avoiding interruption according to the operation of DSG systems when a fault is occurred. Therefore, this paper presents the evaluation algorithm for interruption cost in order to evaluate the benefit for the uninterruptible power supply of DSG systems in a quantitative manner.

• Proceedings of the KIEE Conference
• /
• 2000.11a
• /
• pp.67-69
• /
• 2000

This paper deals with a method for determining an optimal operation strategy of dispersed generating sources. For effective utilization of dispersed generating sources, it is indispensable to consider their thermal merits in addition to electric power. And then the optimal operation of these sources can be determined easily by the principle of equal incremental fuel cost. This paper presents an priority method to decide the optimal location of those sources in power systems about the whole year. The validity of the proposed algorithms are demonstrated using a model system.