• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.126-131
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• 2001

This paper deals with implementation of inverter systems for DC power regeneration, which can regenerate the excessive DC power from DC bus line to AC supply in substations for traction systems. From the viewpoint of both power capacity and switching losses, a three-phase square-wave inverter system is adopted. To control the regenerated power, the magnitude and phase of fundamental output voltages should be appropriately controlled in spite of the variation of input DC voltage. Inverters are operated with modified a-conduction mode to fix the potential of each arm. The overall system consists of the line-to-line voltage and line current sensors, an actual power calculator using d-q transformation method, a complex power controller with PI control scheme, a gating signal generator for modified $\alpha-conduction\;mode\;with\;\delta\;and\;\alpha$, a DPLL for frequency followup, and power circuit.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 Techno-Fair 및 합동춘계학술대회 논문집 전기물성,응용부문
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• pp.173-174
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• 2008

Time Domain Reflectometry(TDR) 기법을 응용하여 극초단파 대역을 포함하는 광대역 주파수범위에서 절연유의 유전율을 쉽게 측정할 수 있는 기법을 제안하였다. 수 GHz 이상의 대역에서의 절연유 유전율은 전자파를 이용한 전력용 변압기 부분방전 발생위치 추정에 필수적인 정보이나 기존의 방법으로 간단히 측정할 수 없었다. 본 기법은 동축구조에서 전자파 진행속도가 절연매질 유전율의 함수로 인가된 펄스파의 매질에 대한 동축선로에서 진행시간을 계산함으로써 유전율을 구하는 간단한 방법이다. 제안한 새로운 방법을 이용해 절연유중 1종4호 신유의 경우 광대역에서의 유전율은 2.1임을 알 수 있었다.

• 대한전기학회논문지:전력기술부문A
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• 제50권12호
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• pp.568-574
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• 2001

The variations of real time electric power price in competitive electricity markets have influence on electric power demands of the consumers. The effects of the consumers for electric power price can be expressed the price elasticity coefficient of the power demand as a measurement. Residential, commercial, and industrial consumers with different characteristics cause the different price elasticity of the power demand due to changing the pattern of consumption. It is necessary that the effects of electric power demands as a function of elasticity coefficient for each loads should be analyzed in Korea which is processing deregulated electric market. Therefore, this paper calculate the elasticity coefficient of each loads and analysis the effects of electric power demands as a function of elasticity coefficient of inflexible and flexible consumers in competitive electricity market.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 C
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• pp.1768-1769
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• 2003

가스절연개폐장치(Gas-insulated Switchgear, GIS)의 예방진단 기술의 한 방법으로, 극 초단파(Ultrahigh frequency) 부분방전(Partial discharge) 센서를 사용하여 결함의 유무를 판별할 수 있다. 그러나 UHF PD 센서에는 부분방전신호 이외에 외부 잡음의 유입 가능성이 크다. 따라서 본 논문에서는 PD 센서 주변 잡음을 측정하기 위하여 $0{\sim}2$ GHz 의주파수영역에서 산지, 도심 지역의 변전소의 위치에 따른 외부 잡음을 측정하였다. 주파수 대역별로 FM 방송, TV 방송, 이동전화, 등의 신호를 판별하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 전력전자학술대회 논문집
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• pp.638-641
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• 2001

Connectorless power transmission and supply are the power transfer device revealed by resonant inverter or transformer using inductant device. Recently, on power supply have been going on frequently, so several power supply circuit forms are announced. But Compared with the circuit of previous paper, instead of the circuit composed of a simple sylinder Ferrit, I was manufacture in a sylinder that It was a double overlab to a sylinder and I was followed a double flux in inner flux path. Above all, for practicalization, supply circuit operation character analysis and development of controller should be preceded. According to this paper, power transmission and supply analyze characters and design control circuit like the analysis of general resonant inverter for power transmission. They compose the circuit to get sinusoid wave output voltage using pulse width modulation control mode. For Supply, output wave form through power track and power pick-up of magnetic inductance includes ripper component. So I intend to design the controller including filter and regulator, compare analyze theoretical result with real measurement value and then show you their practicality

• Nuclear Engineering and Technology
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• 제53권3호
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• pp.842-850
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• 2021

Real Time Simulation (RTS) has long been used in the nuclear power industry for operator training and engineering purposes. And, Online Simulation (OLS) is based on RTS and with connection to the plant information system to acquire the measurement data in real time for calibrating the simulation models and following plant operation, for the purposes of analyzing plant events and providing indicative signs of malfunctioning. An OLS system has been developed to support PWR operations for CPR1000 plants. The OLS system provides graphical user interface (GUI) for operators to monitor critical plant operations for preventing faulty operation or analyzing plant events. Functionalities of the OLS system are depicted through the maneuvering of the GUI for various OLS functional modules in the system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1986년도 하계학술대회논문집
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• pp.300-304
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• 1986

• 전기저널
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• 통권397호
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• pp.51-51
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• 2010

• 전기저널
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• 5호통권161호
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• pp.14-21
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• 1990

• 드라이브 ㆍ 컨트롤
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• 제4권3호
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• pp.17-27
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• 2007