• Title/Summary/Keyword: Wide Area Blackout

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Building and Actual Proving K-WAMS in Korea Power Grid (광역 전력계통 감시시스템 구축 및 실증)

  • Kim, Sang-Tae;Kim, Ji-Young;Song, Wan-Seok;Jang, Su-Hyung;Moon, Young-Hwan;Kim, Tae-Hyun
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.175_176
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    • 2009
  • K-WAMS based on i-PIU as a synchro-phasor data acquisition device using GPS can treat a monitoring and evaluation of wide area power system to detect a various symptoms of wide area disturbances and prevent large blackout. This paper introduced the development of K-WAMS such as WAMS(Wide Area Monitoring System).

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Preventive Control Algorithm Using Sensitivity Analysis in Voltage Stability Assessment. (감도 해석을 통한 전압안정도 예방제어 알고리듬 개발)

  • Han, Sang-Wook;Seo, Sang-Soo;Lee, Byong-Jun;Jang, Kyung-Chul;Kim, Tae-Kyun
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.483-485
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    • 2005
  • In 2003, there was a wide-area blackout in the United States and Canada. More than fifty million people underwent power failure and the estimated financial loss was about four billion dollars. By such wide-area blackouts, the interest in voltage stability has increased gradually. In order to maintain the voltage stability, the preventive control is essential for a contingency. In this paper, a proper preventive control is determined for defined severe contingencies. Among the preventive control methods (generation rescheduling, load curtailment, tap adjusting, injecting the shunt capacitor, and so on.), this paper presents the injection of shunt capacitors by the sensitivity analysis of the voltage stability assessment for preventive controls. The 2006-2010 KEPCO summer peak system is used in case studies.

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Development of High Speed Circuit Breaker using Electromagnetic Repulsion Actuator (전자기 반발 구동장치를 사용한 고속 차단기 개발)

  • Hwang, Kwang-Soo;Kim, Young-Il;Moon, Chae-Joo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.3
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    • pp.441-448
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    • 2022
  • In the distribution system, there are multiple power protection systems such as circuit breakers at substations, and reclosers, minimum circuit ampacities, fault interrupters on distribution lines. They are widely used to prevent partial outages, cascading power failure or blackout so that other healthy systems could maintain the integrity in case of the instant fault or permanent failure on the power lines. However, when a fault happens, it could cause a major black out due to the lack of the protection cooperation between the protection relay of the circuit breaker at a substation and a protection system on the distribution lines. To achieve the power system integrity better, it is required to develop the circuit breaker which can be operational within 1 cycle(16ms). In this study, the high speed circuit breaker which is filled up with eco-friendly gas is developed. This equipment achieved an excellent test results based on IEC 62271-111 standard. It is respected that this equipment would contribute to prevent the wide area blackout by isolating a fault area quicker and faster.

RTDS Simulation for the System Blackstart of the Honan Area (RTDS를 이용한 전계통 정전시 호남지역 시송전선로 검토)

  • Bong, O.Y.;Kim, K.D.;Lee, M.R.;Lee, N.H.
    • Proceedings of the KIEE Conference
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    • 2001.11b
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    • pp.223-225
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    • 2001
  • When a wide area blackout occurres, reenergizing transmission lines should be done at first. The KEPCO(Korea Electric Power Corporation) divides whole power system grid Into seven subsystem. This paper describes the investigation of facts, such as voltage rising and system stability, which occur in case that the blackstart plant of the Honam area will be displaced from Juam H/P to Seojingang H/P.

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Study on the Development of Load Shedding Scheme for Improving Voltage Stability of Seoul Metropolitan Area using Synchro-phasor Data (Synchro-Phasor 데이터를 이용한 수도권 전압 안정화 제어 스킴 개발에 관한 연구)

  • Shin, Jeong-Hoon;Nam, Su-Chul;Baek, Seung-Mook;Lee, Jae-Gul;Moon, Seung-Pil;Kim, Tae-Kyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.9
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    • pp.1530-1539
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    • 2010
  • Recent technology advancement related to computer & communication and measuring devices allows system operators to adopt more intelligent monitoring and control systems to their power systems in order to prevent massive system blackout. Among them, wide-area monitoring and control(WAMAC) system based on synchro-phasor technology has been widely applied to power systems for their own purposes. In this paper, the study on the development of load shedding scheme to improve voltage stability in KEPCO system is introduced. Summary of WAMAC technology being developed and applied in the world through extensive literature survey is proposed. And methodology to develop voltage stability index and multi-step load shedding scheme based on synchro-phasor data is also presented.

Analysis of the Harmonic Resonance during Restoration of Primary Restorative Transmission System (시송전계통 탁구과정에서의 고조파 공진 현상에 대한 고찰)

  • Lee, H.J.;Lee, K.S.;Park, S.M.
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.220-222
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    • 2005
  • Power system restoration following a wide area or complete blackout starts with energizing primary restorative transmission systems. During this primary restoration process, unexpected over-voltage may happen due to nonlinear interaction between the unloaded transformer and the transmission system. This is known as the harmonic resonance phenomenon that may cause burning out of transformer or other devices. Since the harmonic resonance originates from the nonlinear characteristics, it is very difficult to predict the occurrence of this phenomenon. This paper reports the possible existence of the harmonic resonance in Korean power system. Analysis of the harmonic over-voltage is presented based on the various simulations using PSCAD/EMTDC.

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Impact of hidden failure analysis of protective relay in transmission system (송전계통 보호계전기 취약도 평가)

  • Jin, Bo-Gun;Lee, Seung-Jae;Kim, S.-Tae;Lee, Dong-Chul
    • Proceedings of the KIEE Conference
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    • 2006.11a
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    • pp.12-14
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    • 2006
  • This paper presents an vulnerability index for hidden failure of protective relays in transmission system. The bad influence can be quantized by an vulnerability index. When there is mis-operation, no-operation or mis-setting, power flow can be quantized by an index. According to the index, relays can be resetting. So the wide area blackout can be prevented.

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The realization of secondary voltage controller using real-time digital simulator(Hypersim) (실시간 디지털 시뮬레이터(Hypersim)을 이용한 이차적 전압제어 제어기 구현)

  • Kim, Bong-Sik;Seo, Sang-Soo;Lee, Byong-Jin;Song, In-Jun;Shin, Jeong-Hoon;Kim, Tae-Kyun
    • Proceedings of the KIEE Conference
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    • 2006.11a
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    • pp.269-271
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    • 2006
  • In power system, the reactive power is closely associated with voltage. In addition Reactive power has localized characteristic. Recently wide area blackout caused by reactive power imbalance. Therefore it is important to control reactive power considering its characteristic. Until now maintenance of system voltage has been controlled by shunt compensation rather than generators. However because of a large time-constant, shunt compensators are difficult to manage disturbances immediately. In addition shunt compensation has discrete characteristic, which make disturbances in system. In this paper we studied the voltage maintenance method of local buses by controlling the reactive power output of a generator which is closely related a load bus in addition the proposed method was verified by test system.

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A Study on Decentralized under Voltage Load Shedding Scheme for Preventing Wide-area Black Out (광역정전 예방을 위한 분산형 부하 제어 방안에 대한 연구)

  • Lee, Yun-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.1
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    • pp.1-6
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    • 2014
  • An electric power system sometimes fails because of disturbances that occur unexpectedly, such as the uncontrolled loss of load that developed from cascading blackout. Which make stability through a little of under voltage load shedding should work. The development of phasor measurement unit(PMU) makes network supervision possible. The information obtained from PMU is synchronized by global positioning system(GPS). There are many real-time algorithms which are monitoring the voltage stability. This paper presents the study on the VILS(Voltage Instability Load Shedding) using PMU data. This algorithm computes Voltage Stability Margin Index(VSMI) continuously to track the voltage stability margin at local bus level. The VSMI is expressed as active and reactive power. The VSMI is used as an criterion for load shedding. In order to examine the algorithm is effective, applied to KEPCO system.

Analysis of the Harmonic Resonance during Restoration of Primary Restorative Transmission System (시송전계통의 고조파 공진현상에 대한 분석)

  • Lee, Kyeong-Seob;Lee, Heung-Jae
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.5
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    • pp.191-194
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    • 2006
  • Power system restoration following a wide area or complete blackout starts with energizing primary restorative transmission systems. During this primary restoration process, unexpected over-voltage may happen due to nonlinear interaction between the unloaded transformer and the transmission system. This is known as the harmonic resonance phenomenon that may cause burning out of transformer or other devices. Since the harmonic resonance originates from the nonlinear characteristics, it is very difficult to predict the occurrence of this phenomenon. This paper reports the analyses of the harmonic resonance occurred in domestic power system. Various analyses and results of the harmonic over-voltage is presented based on the PSCAD/EMTDC simulations.