• 제목/요약/키워드: Electric power

검색결과 11,854건 처리시간 0.036초

Superconductor Flywheel Energy Storage System

  • Sung, T.H.;Han, Y.H.;Han, S.C.;Choi, S.K.;Jeong, N.H.;Yun, H.J.;Park, B.S.;Kim, K.J.;Oh, J.M.
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 2003년도 High Temperature Superconductivity Vol.XIII
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    • pp.18-18
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    • 2003
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국내 전력수급 방안 (Electric Power Supply & Demand measures in korea)

  • 이기선
    • 기술사
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    • 제44권2호
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    • pp.29-33
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    • 2011
  • In recent years, maximum electric power demand has been increasing steadily. But, Electric Power Supply & Demand problem is occurring due to lack of electric power reserve ratio caused by electric power peak. For this reason, I investigated the current status of the Electric Power Supply & Demand and established Electric Power Supply & Demand and established Electric Power Supply & Demand measures. I will expect that this paper will be contributed balanced and stable Electric Power Supply & Demand management.

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HVDC 해저케이블 고장점 탐지를 위한 EMTP 모델링 (EMTP Modeling for Fault Location in HVDC Sea Submarine Cable)

  • 양병모;박진우;박준우;최경규;강지원;윤형희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
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    • pp.79-80
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    • 2008
  • 제주-해남간 운영중인 HVDC 해저케이블에서 발생한 절연파괴사고('06.4)와 관련하여 써징코일을 이용한 고장점 탐색을 실시하고 고장지점 추정 및 향후 대책마련에 활용하코자, 제주-해남 HVDC 해저케이블 고장점 모의용 EMPT 모델링을 개발하였으며 유인잠수정을 이용한 실측 데이터 값과 EMTP를 활용한 시뮬레이션값을 비교하였다. 향후, 다양한 HVDC 해저케이블 고장유형에 따른 과도해석용 시뮬레이션을 위하며 본 논문에서 개발한 EMTP 모델링 활용이 가능할 것으로 생각된다.

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전기자동차 충·방전제어 통합 환경을 고려한 전기차 1차 주파수 회복예비력의 계통연계형 모델링 (Gird Connected Modeling of Primary Frequency Recovery Reserve Provided by Electric Vehicle Considering Characteristics of Electric Vehicle Charge/Discharge Control Integrated Environment)

  • 국경수;이지훈;문종희;최우영;박기준;장동식
    • KEPCO Journal on Electric Power and Energy
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    • 제7권2호
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    • pp.249-254
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    • 2021
  • As the spreading speed of electric vehicles increases rapidly, those are expected to be able to use them as flexible resources in the power system beyond the concern for the supply of its charging power. Especially when the Renewable Energy sources (RES) which have no intrinsic control capability have replaced the synchronous generators more and more, the power system needs to secure the additional frequency control resources to ensure its stability. However, the feasibility of using electric vehicles as the frequency control resources should be analyzed from the perspective of the power system operation and it requires the existing simulation frameworks for the power system. Therefore, this paper proposes the grid connected modeling of the primary frequency control provided by electric vehicles which can be integrated into the existing power system model. In addition, the proposed model is implemented considering technical performances constrained by the characteristics of the Vehicle-Grid Integration (VGI) system so that the simulation results can be accepted by the power utilities operating the power system conservatively.

Analysis of a Photonic Crystal Fiber Sensor with Reuleaux Triangle

  • Bing, Pibin;Huang, Shichao;Guo, Xinyue;Zhang, Hongtao;Tan, Lian;Li, Zhongyang;Yao, Jianquan
    • Current Optics and Photonics
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    • 제3권3호
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    • pp.199-203
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    • 2019
  • The characteristics of a photonic crystal fiber sensor with reuleaux triangle are studied by using the finite element method. The wavelength sensitivity of the designed optical fiber sensor is related to the arc radius of the reuleaux triangle. Whether the core area is solid or liquid as well as the refractive index of the liquid core contributes to wavelength sensitivity. The simulation results show that larger arc radius leads to higher sensitivity. The sensitivity can be improved by introducing a liquid core, and higher wavelength sensitivity can be achieved with a lower refractive index liquid core. In addition, the specific channel plated with gold film is polished and then analyte is deposited on the film surface, in which case the position of the resonance peak is the same as that of the complete photonic crystal fiber with three analyte channels being filled with analyte. This means that filling process becomes convenient with equivalent performance of designed sensor. The maximum wavelength sensitivity of the sensor is 10200 nm/RIU and the resolution is $9.8{\times}10^{-6}RIU$.

Fabrication of 6 cm Class YBaCuO Single Crystal

  • Park, B.S.;Han, S.C.;Han, Y.H.;Jeong, N.H.;Yun, H.J.;Kim, K.J.;Oh, J.M.;Sung, T.H.
    • 한국초전도학회:학술대회논문집
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    • 한국초전도학회 2003년도 High Temperature Superconductivity Vol.XIII
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    • pp.33-33
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    • 2003
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