• Title/Summary/Keyword: power system restoration

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Analysis Of The Primary Restorative Transmission System To Prevent Self-excitation (자기여자(Self-Excitation) 방지를 고려한 시송전 선로에 관한 연구)

  • Lee, Hung-Jae;Kim, Sang-Seop;Park, Sung-Min;Hwang, Bong-Hwan;Lee, Nam-Ho
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.44-46
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    • 2002
  • Service restoration following a complete or partial collapse starts with reenergize a transmission line from black-start generators. Voltage problems can arise by Ferranti effect as unloaded transmission line is reenergized. This paper presents analytical results on the primary restorative transmission system focused on the voltage problem during the early restoration process. Methodologies to handle load pick-up compensating Ferranti effect. and terminal voltage and reactive capability limitation of black-start generators about self-excitation are presented. An algorithm for static analysis about these methodologies is developed, and EMTDC simulation for verifying the efficiency of the algorithm is performed.

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Fault Location Algorithm in a Two-ended Sources Transmission Line (양전원 송전선로의 고장점 표정 알고리즘)

  • Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.1
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    • pp.18-24
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    • 2016
  • In order to service restoration and enhance power system reliability, a number of impedance based fault location algorithms have been developed for fault locating in a transmission line. This paper presents an advanced impedance-based fault location algorithms in a two-ended sources transmission line to reduce the DC offset error effects. This fault location algorithm uses of the GPS time synchronized voltage and current signals from the local and remote terminal. The algorithm uses an advanced DC offset removal filter. A series of test results using ATPdraw simulation data show the performance effectiveness of the proposed algorithm. The proposed algorithm is valid for a two-end sources transmission network.

A Development of Simulator for Restoration in Power System (전력계통 사고복구 훈련용 시뮬레이터 개발)

  • Ok, Chi-Yun;Baek, Young-Sik;Oh, Seung-Ryle;Kim, Jung-Nyun;Han, Mu-Ho
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.186-188
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    • 2002
  • Recently, power system has a trend of sustaining increase of power demand and large-sized system. Also, consumers has required a high reliability for the power quality in deregulated power industry. For power system operator, the accurate decision for situations of power systems and the ability of the management for the faults are required. Therefore, in this paper we presents the development of simulator which can train the process of the recovery and the decision of contingency in the case of the occurrence of faults for generation, transmission, and distribution facilities.

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A Study on Monitoring the Progressive Tax-based Power Charges Reduction Effects by Applying Fiber-based Artificial Vegetation System to Obsolete Houses (섬유기반 녹화시스템 적용에 따른 노후주택의 누진세기반 전력요금 저감효과에 대한 모니터링 연구)

  • Kim, Tae-Han;Lee, So-Dam
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.20 no.6
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    • pp.67-77
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    • 2017
  • Demands for housing has diversified recently due to low birth rate and the growth of aging population. Also, a share of idle houses and obsolete houses over 20 years old is gradually rising. Therefore, there is a need for a sustainable, environment-friendly improvement policy that is in line with a new housing paradigm and avoids full-scale new construction, such as a customized housing renovation plan considering local economic circumstances. Therefore, afforestation system applicable to buildings are assessed positively, but lack objective performance evaluation. Through one-year, long-term monitoring of replicated obsolete buildings that have poor insulation performance, this study calculated monthly average power consumption and analyzed power charges by applying pricing plans before and after the revision of progressive tax in order to examine economic effects expected by applying the afforestation system. In the obsolete buildings, the study showed that monthly average power consumption was reduced by 16.6kWh with 5.2% average reduction rate. Highest reduction was made in July at 11.3%. Aggregate monthly power consumption charges were relatively high in winter before and after the revision of progressive tax. Power charges reduction effect was highest in March when monthly power consumption was reduced to 300kWh level by applying the afforestation system.

A Study on the Damping Loads Prediction to prevent Harmonic Resonance during the Power System Restoration (전력계통의 정전복구시 고조파 공진억제를 위한 완충부하투입량 예측에 관한 연구)

  • Lee, Heung-Jae;Yu, Won-Kun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.7
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    • pp.913-917
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    • 2013
  • During the restoration process of primary restorative transmission system, some over voltages may happen due to nonlinear interaction between unloaded transformers and transmission systems. These over voltages caused by harmonic resonance can be suppressed by inserting damping loads before energizing transformers. But it is very difficult to predict the occurrence possibility of harmonic resonance and complex simulation must be repeated to estimate the sufficient damping loads. This paper presents a damping loads prediction system to prevent harmonic resonance. Detailed analysis of the relationship between harmonic resonance and the amount of damping loads is discussed. The prediction system is developed using a curve fitting and a neural network based on this relationship. A curve fitting used a Gaussian function based on non-linear least square method and multi-layer back-propagation neural network is applied. The system is applied to primary restorative transmission lines in korean power system and the result showed satisfactory performance.

The Development of Application Programs for Optimal Feeder Operation Through Distribution Automatic System

  • Ha, Bok-Nam;Seol, Ieel-Ho;Jeong, Mi-Ae
    • KIEE International Transactions on Power Engineering
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    • v.4A no.1
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    • pp.42-47
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    • 2004
  • This paper presents the various application programs for the Distribution Automation System (DAS) of the Korea Electric Power Corporation (KEPCO)'s distribution system. These programs are developed to allow for optimal operation in the areas of feeder automation, relay coordination, loss minimization and so on. They are single line diagram auto creation programs for the feeder, service restoration program, protection coordination program, data error detection program, and optimal network reconfiguration program. The details of these programs are presented for validity and effectiveness.

A Protection Method with single-bonding system in EHV Underground Transmission Line (초고압 지중 케이블 시스템에 대한 편단접지시의 보호대책)

  • Kim, J.W.;Kang, D.H.;Park, K.R.;Kim, Y.B.
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1620-1622
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    • 1998
  • The failure occurs in the system of the underground transmission line, the time of restoration is very long, the damage from stopping power supply is very serious and the cost of restoration is very great. because of these problems, the system and equipment must be protected from every electrical failure by installing protection unit. This study is summarized and compared the effects of configuration method of cable protection device with respect to surges in EHV (Extra High Voltage) underground transmission system.

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A Stable Black-Start Strategy for a Stand-Alone DC Micro-Grid

  • Cha, Jae-Hun;Han, Yoon-Tak;Park, Kyung-Won;Oh, Jin-Hong;Choi, Tae-Seong;Ko, Jae-Hun;MAHIRANE, Philemon;An, Jae-Yun;Kim, Jae-Eon
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.30-37
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    • 2018
  • Unlike an AC system, a DC system does not cause problems with synchronization, stability, reactive power, system losses, and cost. However, more research is still required for the application of DC Systems. This paper proposes a stable black-start strategy for a stand-alone DC micro-grid, which consists of an energy storage system, photovoltaic generator, wind-turbine generator, diesel generator, and DC loads. The proposed method is very important for avoiding inrush current and transient overvoltage in the power system equipment during restoration after a blackout. PSCAD/EMTDC software was used to simulate, analyze, and verify the method, which was found to be stable and applicable for a stand-alone DC micro-grid.

SERVICE RESTORATION OF POWER DRSTRIBUTION SYSTEM IN CONSIDERATION OF PROTECTIVE DEVICES (보호기기를 고려한 배전계통 복구방안)

  • Lee, Seung-Jae;Kim, Tae-Hyung;Yoon, Jin-Young;Kim, Kuk-Hun;Kim, Hak-Moo
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.48-50
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    • 1993
  • One of the most important functions in the distribution automation is the service restoration. This paper proposes the new method which considers not only constraints of voltage, line current and bank capacity but also the operating characteristics of protective devices such as OCR and reclosers.

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COMPUTERIZED CALL RESPONSE SYSTEM DEVELOPMENT AND OPERATION FOR DISTRIBUTION SERVICES (전기고장접수 처리 자동화장치 개발운용)

  • Lee, Yong-Hae
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.265-269
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    • 1989
  • Computerized to techniques have been applied to outage call processing system for rapid restoration of power to customers. This paper presents computer aided outage call processing system called '123' system, which has been in operation since 1987. And, also describes its origins, design conception to be considered and its operation effects. From a positive point of view, it shows the functions needs to be added and some problems to be improved. Additionally, it describes the integrated system which has functions of detecting distribution failure, locating failure position by logical computer processing, and although ADS (Automatic Distribution System) has yet to be built up, the primary purpose of the system is to improve service to the customer by means of rapid restoration of electricity outage.

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