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電氣學會論文誌. IEEJ transactions on Power and Energy. B ... 6건

  1. [해외논문]   Emerging Energy Systems from the End User's Perspective  

    Tsuji, K.
    電氣學會論文誌. IEEJ transactions on Power and Energy. B : 電力·エネルギー v.124 no.1 ,pp. 1 - 2 , 2004 , 0385-4213 ,

    초록

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  2. [해외논문]   Nonlinear Excitation Control of Two Sets of Adjustable Speed Generators/Motors at Rotary Type Frequency Converter Station for Performance Improvement of Power System Dynamics  

    Sae-Kok, Worawut (Department of Electrical Engineering, the University of Tokyo ) , Yokoyama, Akihiko (Department of Electrical Engineering, the University of Tokyo ) , Verma, Suresh Chand (Chubu Electric Power Co. Inc. ) , Ogawa, Shigeaki (Chubu Electric Power Co. Inc.)
    電氣學會論文誌. IEEJ transactions on Power and Energy. B : 電力·エネルギー v.124 no.1 ,pp. 84 - 94 , 2004 , 0385-4213 ,

    초록

    There are 50Hz and 60Hz power systems in Japan, which are interconnected by power electronics based static type frequency converter station. Frequency converter can be realized by using A djustable S peed G enerators/ M otors (ASGMs), which are excited by AC voltage, and so-called rotary type frequency converter. The rotary type frequency converter can also function as a power system stabilizer by effectively utilizing rotational energy stored in rotors. Nonlinear excitation control for the rotary type frequency converter is proposed to enhance performance of the rotational energy utilization and to improve stability of power system. The control performance is examined for a power system model by digital dynamic simulation. It is made clear that the proposed nonlinear excitation control is effective even though local information of the rotary type frequency converter is just used and that it has robustness against various load flow conditions.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  3. [해외논문]   LMI-Based Robust H2 Controller Design for Damping Oscillations in Power Systems  

    Hardiansyah (Department of Electrical Engineering, Nagaoka University of Technology ) , Furuya, Seizo (Department of Electrical Engineering, Nagaoka University of Technology ) , Irisawa, Juichi (Department of Electrical Engineering, Nagaoka University of Technology)
    電氣學會論文誌. IEEJ transactions on Power and Energy. B : 電力·エネルギー v.124 no.1 ,pp. 113 - 120 , 2004 , 0385-4213 ,

    초록

    Recent results have shown that several H 2 and H 2 -related problems can be formulated as a convex optimization problem involving linear matrix inequalities (LMIs) with a finite number of variables. This paper presents an LMI-based robust H 2 controller design for damping oscillations in power systems. The proposed controller uses full state feedback. The feedback gain matrix is obtained as the solution of a linear matrix inequality. The technique is illustrated with applications to the design of stabilizer for a typical single-machine infinite-bus (SMIB) and a multimachine power system. The LMI based control ensures adequate damping for widely varying system operating conditions and is compared with conventional power system stabilizer (CPSS).

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  4. [해외논문]   A New Environmentally Friendly Design Program, TLCALC 2001 for High Voltage AC Transmission Lines  

    Yang, Kwang-Ho (Korea Electrotechnology Research Institute (KERI) ) , Ju, Mun-No (Korea Electrotechnology Research Institute (KERI) ) , Myung, Sung-Ho (Korea Electrotechnology Research Institute (KERI) ) , Shin, Koo-Yong (Korea Electric Power Research Institute (KEPRI) ) , Lee, Dong-Il (Korea Electric Power Research Institute (KEPRI))
    電氣學會論文誌. IEEJ transactions on Power and Energy. B : 電力·エネルギー v.124 no.1 ,pp. 137 - 142 , 2004 , 0385-4213 ,

    초록

    Various noises produced by corona discharges from high voltage transmission lines are the important considerations in line design. HVAC transmission lines must be designed to satisfy national environmental regulations too. Therefore, it is necessary for line designers to pre-evaluate environmental problems using prediction tools. In this paper, an environmental design software, TLCALC 2001 for AC transmission lines as a comprehensive window program is introduced. It has 6 modules including audible noise, radio noise, television noise, magnetic field, electric field and conductor surface gradient module. TLCALC 2001 has solved some of the problems of the existing foreign tools and has several advantages over those. 1) It is a common tool that has solved calculating limitations of foreign formulas. 2) It has a wide application range and enhanced prediction accuracy. 3) It can be applied to almost all transmission line configurations in Korea. 4) Experienced designers can get calculation results within about 15 minutes. As the use of TLCALC 2001 is easy and practical, it will be applied to the environmentally friendly design and construction of transmission lines. It is expected that public complaints and social environmental costs will be considerably reduced by the use of TLCALC 2001 in the future.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  5. [해외논문]   Anode-fall Voltages of Air Arcs Between Electrodes of Copper,Silver and Tungsten at Currents up to 1500A  

    Hemmi, Rei (Department of Electrical Engineering, Nagoya University ) , Yokomizu, Yasunobu (Department of Electrical Engineering, Nagoya University ) , Matsumura, Toshiro (Department of Electrical Engineering, Nagoya University)
    電氣學會論文誌. IEEJ transactions on Power and Energy. B : 電力·エネルギー v.124 no.1 ,pp. 143 - 149 , 2004 , 0385-4213 ,

    초록

    A method for estimating an anode-fall voltage of an arc discharge was developed. By using this method, the anode-fall voltages were evaluated for air arcs in atmosphere burning between the electrodes of copper, silver and tungsten. The anode-fall voltages V a of air arcs proved to be about 1.2, 4.5 and 1.2V for the copper, silver and tungsten electrodes respectively and were found to be almost independent of the ac half-wave current from 350 up to 1500A peak . From the above results, the difference in the anode material seems to lead to the variation in the anode-fall voltage.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  6. [해외논문]   Effect of Lightning Protective Devices Attached to Pole Transformers on Reduction of Overvoltage on Distribution Lines  

    Asaoka, Yoshinobu (Central Reserch Institute of Electric Power Industry ) , Asakawa, Akira (Central Reserch Institute of Electric Power Industry ) , Yokoyama, Shigeru (Kyushu University ) , Nakada, Kazuo (Hokuriku Electric Power Company ) , Sugimoto, Hitoshi (Hokuriku Electric Power Company)
    電氣學會論文誌. IEEJ transactions on Power and Energy. B : 電力·エネルギー v.124 no.1 ,pp. 150 - 155 , 2004 , 0385-4213 ,

    초록

    Abstract: Class-10A solid-core insulators (BIL 90kV) have been used instead of class-6A pin insulators (BIL 60kV) in order to improve the insulation level of distribution lines. However, lightning protective devices attached to pole transformers may have the effect of reducing the overvoltages on phase conductors. We have investigated the lightning protection effect of devices attached to pole transformers by experiment and analysis using the EMTP (Electro-Magnetic Transients Program). The sparkover rate changes from 2.0˜3.3% to 5.5˜9.9% and increases 2.4˜2.8 times when the line insulator of the phase conductors is changed from class-10A to class-6A. It is thought that the insulation level of the line insulator can be reduced depending upon the local particularities, such as number of installed transformers, frequency of direct lightning stroke to the distribution line, and so on although the overall fault rate may increase to some extent.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지

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