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Journal of electrical engineering & technology 21건

  1. [국내논문]   Damping Analysis using IEEEST PSS and PSS2A PSS   피인용횟수: 1

    Lee Sang-Seung (RERI and the PSRD of KESRI, Seoul National University ) , Kang Sang-Hee (Electrical Engineering of Myongji University ) , Jang Gwang-Soo (School of Electrical Engineering, Seoul National University ) , Li Shan-Ying (School of Electrical Engineering, Seoul National University ) , Park Jong-Keun (School of Electrical Engineering, Seoul National University ) , Moon Seung-Il (School of Electrical Engineering, Seoul National University ) , Yoon Yong-Tae (School of Electrical Engineering, Seoul National University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 271 - 278 , 2006 , 1975-0102 ,

    초록

    This paper scrutinized the damping effects of installing the prototype PSSs by a transient analysis for eight buses of faults in the South Korean power system. The PSSs used have the co-PSS blocks for IEEEST model with a single input and the co+power PSS blocks for PSS2A model with dual inputs. The simulation tool was a TSAT(Transient Security Assessment Tool) developed by Powertech Labs Inc. The voltages of the transmission line for simulations were 765kV and 345kV, and the faults for eight cases were sequenced by considering the open state and the close state of the lines. In the simulations, the three-phase line to ground (L-G) fault generated different points for each region. The simulations were compared to the cases of no PSS, partial IEEEST and PSS2A, absolute IEEEST, and absolute PSS2A to show that the power system oscillation can be effectively damped by PSS modules. Simulations were conducted to confirm the effectiveness for the KEPCO (Korea Electric Power Corporation) power system.

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  2. [국내논문]   A Method for Estimating an Instantaneous Phasor Based on a Modified Notch Filter  

    Nam Soon-Ryul (Next-Generation Power Technology Center(NPTC) and the Depart-ment of Electrical Engineering, Myonjgji University ) , Sohn Jin-Man (School of Electrical Engineering, Seoul National University ) , Kang Sang-Hee (Next-Generation Power Technology Center(NPTC) and the Depart-ment of Electrical Engineering, Myonjgji University ) , Park Jong-Keun (School of Electrical Engineering, Seoul National University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 279 - 286 , 2006 , 1975-0102 ,

    초록

    A method for estimating the instantaneous phasor of a fault current signal is proposed for high-speed distance protection that is immune to a DC-offset. The method uses a modified notch filter in order to eliminate the power frequency component from the fault current signal. Since the output of the modified notch filter is the delayed DC-offset, delay compensation results in the same waveform as the original DC-offset. Subtracting the obtained DC-offset from the fault current signal yields a sinusoidal waveform, which becomes the real part of the instantaneous phasor. The imaginary part of the instantaneous phasor is based on the first difference of the fault current signal. Since a DC-offset also appears in the first difference, the DC-offset is removed trom the first difference using the results of the delay compensation. The performance of the proposed method was evaluated for a-phase to ground faults on a 345kV 100km overhead transmission line. The Electromagnetic Transient Program was utilized to generate fault current signals for different fault locations and fault inception angles. The performance evaluation showed that the proposed method can estimate the instantaneous phasor of a fault current signal with high speed and high accuracy.

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    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.

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  3. [국내논문]   Realization of Information Visualization of Electric Power Monitoring System for MV/LV Distribution Customers  

    Kim Jae-Chul (Dept. of Electrical Engineering, Soongsil University ) , Chu Cheol-Min (Dept. of Electrical Engineering, Soongsil University ) , Knag Bong-Seok (New & Renewable Energy Center, KEMCO ) , Kim Yeong-Il (Dept. of Electrical Engineering, Daelim College ) , Choi Duck-Su (KD POWER Cooperation ) , Kim Kwang-Soon (KD POWER Cooperation ) , Ryu Seung-Ki (Korea Institute of Construction Technology)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 287 - 294 , 2006 , 1975-0102 ,

    초록

    Recently, switchboards for MV/LV distribution customers have been united and digitalized rapidly. This paper proposes the effective information visualization method for the data measured from cubicle switchboards for MV/LV distribution customers. We developed the algorithm that analyzes abundant data measured by switchboards and displays them to overall users, such as fire information index, power condition index, switchboard safety index, and power diminution index. Using a touch screen made users to operate it easily. User interface was also improved by taking graphic visualization. We guess the information visualization method suggested in this paper shows the new direction that heavy electrical equipments including switchboards are going to develop in the future.

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    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.

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  4. [국내논문]   An Improved Technique for Fault Location Estimation Considering Shunt Capacitance on Transmission Line  

    Kim Hyun-Houng (Dept. of Electrical Engineering, Konkuk University ) , Jeong Yun-Won (Dept. of Electrical Engineering, Konkuk University ) , Lee Chan-Joo (Dept. of Electrical Engineering, Konkuk University ) , Park Jong-Bae (Dept. of Electrical Engineering, Konkuk University ) , Shin Joong-Rin (Dept. of Electrical Engineering, Konkuk University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 295 - 301 , 2006 , 1975-0102 ,

    초록

    This paper presents a new two-terminal numerical algorithm for fault location estimation using the synchronized phasor in time-domain. The proposed algorithm is also based on the synchronized voltage and current phasor measured from the PMUs (Phasor Measurement Units) installed at both ends of the transmission lines. In this paper, the algorithm is given without shunt capacitance and with shunt capacitance using II -model and estimated using DFT (Discrete Fourier Transform) and LES (Least Error Squares Method). The algorithm uses a very short data window and classification for real-time transmission line protection. To verify the validity of the proposed algorithm, the Electro-Magnetic Transient Program (EMTP) and MATLAB are used.

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    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.

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  5. [국내논문]   Three-phase Transformer Model and Parameter Estimation for ATP  

    Cho Sung-Don (Plant Engineering Team, Samsung Corporation)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 302 - 307 , 2006 , 1975-0102 ,

    초록

    The purpose of this paper is to develop an improved three-phase transformer model for ATP and parameter estimation methods that can efficiently utilize the limited available information such as factory test reports. In this paper, improved topologically-correct duality-based models are developed for three-phase autotransformers having shell-form cores. The problem in the implementation of detailed models is the lack of complete and reliable data. Therefore, parameter estimation methods are developed to determine the parameters of a given model in cases where available information is incomplete. The transformer nameplate data is required and relative physical dimensions of the core are estimated. The models include a separate representation of each segment of the core, including hysteresis of the core, ${\lambda}-i$ saturation characteristic and core loss.

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    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.

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  6. [국내논문]   Analysis on Current Distribution of Four-Layer HTSC Power Transmission Cable with a Shield Layer  

    Lim Sung-Hun (Department of Electrical Engineering, Soongsil University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 308 - 312 , 2006 , 1975-0102 ,

    초록

    The inductance difference between conducting layers of high-Tc superconducting (HTSC) power transmission cable causes the current sharing of each conducting layer to be unequal, which decreases the current transmission capacity of HTSC power cable. Therefore, the design for even current sharing in HTSC power transmission cable is required. In this paper, we investigated the current distribution of HTSC power cable with a shield layer dependent on the pitch length and the winding direction of each layer. To analyze the effect of the shield layer on the current sharing of the conducting layers of HTSC power cable, the current distribution of HTSC power cable without a shield layer was compared with the case of HTSC power cable with a shield layer. It could be found through the analysis from the computer simulations that the shield layer of HTSC power cable could be contributed to the improvement of current distribution of conducting layers at the specific pitch length and the winding direction of conducting layer. The result and discussion for the current distribution calculated for HTSC power transmission cable with a shield layer were presented and compared with the cable without a shield layer.

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    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.

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  7. [국내논문]   Enhancement of Interface Flow Limit using Static Synchronous Series Compensators   피인용횟수: 1

    Kim Seul-Ki (Power Conversion and System for RES Research Group, Korea Electro-technology Research Institute ) , Song Hwa-Chang (Department of Electrical Engineering, Kunsan University ) , Lee Byoung-Jun (Department of Electrical Engineering, Korea University ) , Kwon Sae-Hyuk (Department of Electrical Engineering, Korea University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 313 - 319 , 2006 , 1975-0102 ,

    초록

    This paper addresses improving the voltage stability limit of interface flow between two different regions in an electric power system using the Static Synchronous Series Compensator (SSSC). The paper presents a power flow analysis model of a SSSC, which is obtained from the injection model of a series voltage source inverter by adding the condition that the SSSC injection voltage is in quadrature with the current of the SSSC-installed transmission line. This model is implemented into the modified continuation power flow (MCPF) to investigate the effect of SSSCs on the interface flow. A methodology for determining the interface flow margin is simply briefed. As a case study, a 771-bus actual system is used to verify that SSSCs enhance the voltage stability limit of interface flow.

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

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  8. [국내논문]   Rotor Design to Improve Starting Performance of the Line-start Synchronous Reluctance Motor  

    Jung Tae-Uk (Gwangju Research Center, Korea Institute of Industrial Technology (KITECH) ) , Nam Hyuk (Research Lab., Digital Appliance Company, LG Electronics Inc.)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 320 - 326 , 2006 , 1975-0102 ,

    초록

    A single-phase line-start synchronous reluctance motor (LSSynRM) has merits of low cost, high efficiency and reliability. LSSynRM has an unbalanced magnetic circuit caused by flux barriers and various shapes of conductor bars when starting. Thus the motor may generate unstable starting torque in accordance with the initial starting position of the rotor. This paper presents the rotor design to improve starting performance of the LSSynRM. Design variables are the number and the shape of the conductor bars. This design result is compared with the initial prototype and single-phase induction motor.

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    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.

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  9. [국내논문]   Analysis of Torque Characteristics for the Single-phase Induction Motor Considering Space Harmonics   피인용횟수: 1

    Kim Byung-Taek (Dept. of Electrical and Electronic Engineering, Kunsan National University ) , Lee Sung-Ho (DA Laboratory, LG Electronics Inc. ) , Kwon Byung-Il (Dept. of Electrical and Electronic Engineering, Hanyang University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 327 - 331 , 2006 , 1975-0102 ,

    초록

    This paper presents the analysis method for the torque characteristic of the 1-phase induction motor considering space harmonics in the air gap. The equivalent circuit method is used, where the circuit constants are obtained by classic theory. In addition, the space harmonic components in air gap magneto motive force are analyzed and added to the equivalent circuit to obtain accurate torque characteristics in low speed regions. Each torque component due to the harmonics is calculated and the total torque characteristic is obtained and compared with the measurement result.

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    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.

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  10. [국내논문]   Electronic Ballast with Constant Power Output Controller for 250W MH Lamp  

    Jung Dong-Youl (Dept. of Electrical Engineering, Kangwon National University ) , Park Jong-Yeon (Dept. of Electrical Engineering, Kangwon National University)
    Journal of electrical engineering & technology v.1 no.3 ,pp. 332 - 337 , 2006 , 1975-0102 ,

    초록

    In this paper, an electronic ballast was developed to control a 250W metal halide lamp. To avoid acoustic resonance phenomenon, we calculated the acoustic resonance band and determined the driving frequency from 70kHz to 100kHz. Due to the switching loss of MOSFET, many problems are caused in the inverter circuit during lamp lighting, so we reduced the loss by connecting the capacitor that minimizes the magnitude of the impulsive voltage. In this paper, the main point of research is to find the methods to operate the lamp on the rated output power. After detecting the current and the voltage of the lamp, we changed the driving frequency by adjusting the DC voltage level of the VCO input.

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

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