• Title/Summary/Keyword: Electric power

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Technical Problems and solution based on Connection of Dispersed Power System into Power Distribution System (분산형전원의 배전계통연계에 따른 기술적 과제와 대책)

  • Yoon, G.G.;Yoon, T.S.;Roh, H.N.;Park, C.H.;Kim, J.O.;Kim, J.S.
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.485-487
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    • 2001

  • Electric power has traditionally been supplied to the demander through power generation, its transmission, and final distribution system. It is, however, expected that the various dispersed power system will be located near demanders and act as a power source based on the efficient management of electric power demanders and the optimal utilization of substitute energy. More stable electric power and efficient utilization of various power sources can be guranteed through the connection of the dispersed power system into the existing power system. It is the purpose of this study that, in the case of the connection of dispersed power system into the existing distribution line, effects of the connection on the power quality and plans for protection of power equipments are discussed and solutions of them are proposed.

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Development and Test of a Cooling System for a 154 kV Superconducting Fault Current Limiter

  • Kim, Heesun;Han, Young Hee;Yang, Seong-Eun;Yu, Seung-Duck;Park, Byung Jun;Park, Kijun;Yoo, Jaeun;Kim, Hye-Rim;In, Sehwan;Hong, Yong Joo;Yeom, Hankil
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.141-144
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    • 2015

  • The superconducting fault current limiter (SFCL) is an electric power device that limits the fault current immediately in a power grid. Korea Electric Power Corporation (KEPCO) has been developing a 154 kV, 2 kA SFCL since 2011 to protect power grids from increasing fault current and improve the stability and quality of electric power. This SFCL adopts 2G YBCO wires and operates at 71 K and 5 bars. In this paper, a cooling system for the 154 kV SFCL and its cooling test results are reported. This cooling system uses a Stirling-type cooler to make sub-cooled liquid nitrogen ($LN_2$), which cools the superconductor modules of the SFCL. The $LN_2$ is circulated between the cooler and the cryostat that contains superconductor modules. The $LN_2$ also plays the role of a high voltage insulator between the modules and the cryostat, so the pressure was maintained at 5 bars for high insulation performance. After installation in a test site, the cooling characteristics of the system were tested. In this operation test, some important data were measured such as temperature distribution in $LN_2$, pressure change, performance of the heat exchanger, and cooling capacity of the total system. Consequently, the results indicate that the cooling system operates well as designed.

  • https://doi.org/10.18770/KEPCO.2015.01.01.141 인용 PDF KSCI

Reactive Power Loadability in Korean Power System (한전 계통에서의 무효전력 부하 평가에 관한 연구)

  • Yoon, Jong-Su;Won, Jong-Ryul;Yoon, Yong-Beum;Jang, Byung-Hoon;Lee, Ki-Sun;Choo, Jin-Boo
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1472-1474
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    • 1999

  • This paper proposes the estimation method about how much reactive power can be increased or decreased under prescribed bus voltage limits in non-linear reactive power and power flow equations. The static nonlinear reactive power voltage problem can be formulated using a linear resistive(I-V) network with voltage dependent current sources. Linear programming model is derived for finding bounds on reactive power. This method was applied to future Korean power system and proved its effectiveness.

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A Study on Repowering of Domestic Aged Coal-fired Power Plant

  • Baek, SeHyun;Kim, YoungJoo;Kim, HyunHee;Park, SangBin;Jang, JiHoon
    • KEPCO Journal on Electric Power and Energy
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    • v.3 no.1
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    • pp.35-39
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    • 2017

  • Recently, the public opinion is growing that the main cause of greenhouse gas, fine dust and nitrogen oxide, sulfuric acid emission is coal-fired power plant, and now the decommission or conversion to other clean fuel is being demanded. However, it is a huge national loss to decommission coal-fired power plant with remaining life, and also simple fuel converting to natural gas will lead to drastic rise on power generating cost. Therefore, this study aims to provide the analysis result about the reduction effect of $CO_2$, environment emission, and to influence to power plant performance and facilities when repowering with adding gas turbine is applied to domestic aged coal-fired power plant.

  • https://doi.org/10.18770/KEPCO.2017.03.01.035 인용 PDF KSCI

Numerical Simulation on the Temperature Distribution by Ventilation Type during Heat of the Power line in Electric Power Tunnel (전력구 터널 내 전력선 발열 시 환기방식에 따른 온도분포에 대한 전산해석)

  • Lee, Ho-Hyung;Lee, Seung-Chul;Kwak, Dong-Kurl;Baek, Doo-San
    • Proceedings of the KIPE Conference
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    • 2014.07a
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    • pp.3-4
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    • 2014

  • Power line in electric power tunnel generate heat around during power transmission. Rising temperature inside the electric power tunnel reduces the transmission efficiency of the power line. In this study, trying to understand the change in temperature in the electric power tunnel by forced ventilation and natural ventilation when the temperature rise of the electric power tunnel. The results show that average temperature in electric power tunnel by natural ventilation, forced ventilation is $56.55^{\circ}C$, $23.25^{\circ}C$. Therefore electric power tunnel during power transmission needs cooling or ventilation system.

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