• Title/Summary/Keyword: Transient stability

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The Stablity and Transient Response in the Buck-Boost DC-DC Converter (승강엽형 DC-DC 콘버어터의 안정도 및 과도 응답)

  • 김희준;김순창
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.28B no.5
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    • pp.421-430
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    • 1991
  • This paper investigated the errect of the right-half-plane zero on stability in the buck-boost DC-DC converter which is one type of the switching regulator and the stability region for the variation of the output current is obtained by evaluating the feedback gain. And it is clarified that the damping ratio decreases gradually by increase of the feedback loop gain and the regulation system of the converter becomes unstable, and from the transient response analysis we obtainedthe stability region about this converter. From above result it is known that the stability decreases by the existence of the right-half-plane zero. For the improvement of stability, we carried out one pole compensation in feedback circuit and obtained the avaliable stability region in relation to the gain bandwidth product from the stability and transient response analysis. These results were established experiment.

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The Study of FACTS Impacts for Probabilistic Transient Stability

  • Kim Hyung-Chul;Kwon Sae-Hyuk
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.129-136
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    • 2006
  • This paper proposes a probabilistic evaluation for the transient stability of electrical power systems incorporating FACTS devices. The uncertainties of the fault location and relay operation time play important keys in power system instability evaluation. The TCSC and SVC are employed for the reduction of system instability probability. This method is demonstrated by the WSCC test system and the results are compared with and without FACTS by means of Monte Carlo simulation.

Effect on Transient Stability According to Application of Adaptive Autoreclosure Using THD (THD를 이용한 적응형 재폐로 방법 적용 시 과도 안정도에 미치는 영향)

  • Kang, Sung-Bum;Seo, Hun-Chul;Lee, Myong-Hee;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.201-202
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    • 2011
  • This paper compares the effect on transient stability by according to application of adaptive autoreclouse using THD with the one of conventional autoreclosure. These two autoreclousure methods are modeled by EMTP/MODELS and simulated according to various fault locations and fault clearing times. This paper analyzes transient stability using simulation results.

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Robust Stability and Transient Behavior of a Two-Degree-of-Freedom Servosystem (2자 유도 서보계의 강인한 안전성 및 과도특성)

  • 김영복
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.32 no.1
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    • pp.59-66
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    • 1996
  • This paper considers robust stability and transient behavior of the Two - Degree - of - Freedom(2DOF) servosystem. A class of uncertainties allowed in the plant model is obtained, to which the servosystem is robustly stable for any gain of the integral compensator. This result implies that if the plant uncertainty is the allowable set defined by the condition, a high - gain compensation can be carried out preserving stability to achieve a high - speed tracking response. The transient behavior attainable by the limit of the high - gain compensation is calculated using the singular perturbation approach.

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A Study on Transient Stability Augmentation by Transfering Line and Bus (송전선 절체제어에 의한 전력계통 안정화 연구)

  • Suh, Eui-Suk;Oh, Tae-Kyoo;Han, Hoo-Sek
    • Proceedings of the KIEE Conference
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    • 1998.11c
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    • pp.1029-1032
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    • 1998
  • This paper presents the scheme of bus and line transfer for improving transient stability and the reactive transient stability index usable in time simulation. And also multi-transferring scheme for improving damping is proposed. These results can be applied in determining the effective position for transfer control.

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A Study on Transient Stability Augmentation by Transfering Line and Bus (송전선 절체제어에 의한 전력계통 안정화 연구)

  • Suh, Eui-Suk;Oh, Tae-Kyoo;Han, Hoo-Sek
    • Proceedings of the KIEE Conference
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    • 1998.11b
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    • pp.681-684
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    • 1998
  • This paper presents the scheme of bus and line transfer for improving transient stability and the relative transient stability index usable in time simulation. And also multi-transferring scheme for improving damping is proposed. These results can be applied in determining the effective position for transfer control.

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Transient stability analysis of the Yongwol.Bupyong power system by electronic analog computer techniques (상이형전자계산기에 의한 영월.부평간 송전계통의 과도안전도 해석)

  • 한만춘
    • 전기의세계
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    • v.15 no.1
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    • pp.14-19
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    • 1966
  • Transient stability analysis of Yongwol-Bupyong power system, which contains Yongwol steam power station, the largest one in Korea, was undertaken by using the Yonsei 101 Analog computer. The critical switching time and phase angle for the present 150MW power flow to be stable were found. And the transient stability power limit for the system was also found. It is concluded that the system becoms unstable if the power flow increases much more than 151MW.

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A Study on Transient Stability Augmentation by Transfering Line and Bus (송전선 절체제어에 의한 전력계통 안정화 연구)

  • Suh, Eui-Suk;Oh, Tae-Kyoo;Han, Hoo-Sek
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.361-364
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    • 1998
  • This paper presents the scheme of bus and line transfer for improving transient stability and the relative transient stability index usable in time simulation. And also multi-transferring scheme for improving damping is proposed. These results can be app1ied in determining the effective position for transfer control.

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A New Stabilizing Method for Transiently Unstable Systems by Using Transient Energy Function (에너지함수를 이용한 과도불안정 시스템의 안정화 방법)

  • Kim, Jung-Woo;Chun, Yeong-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.4
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    • pp.567-575
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    • 2008
  • Transient security assessment(TSA) is becoming an essential requirement not only for security monitoring but also for stabilizing control of power systems under new electricity environments. It has already been pointed out that fast transient stability study is an important part for monitoring and controlling system security. In this paper, we discuss an energy function method for stabilizing control of transiently unstable systems by introducing generator tripping system to enhance the transient stability of power systems. The stabilization with less tripped power can be obtained by tripping the generators faster than out-of-synchronism relay. Fast transient stability assessment based on the state estimation and direct transient energy function method is an important part of the stabilizing scheme. It is possible to stabilize the transiently unstable system by tripping less generators before the action of out-of-synchronism relay, especially when a group of generator are going to be out-of-synchronism. Moreover, the amount of generator output needed for tripping can be decided by Transient Energy Function(TEF) method. The main contribution of this paper is on the stabilizing scheme which can be running in the Wide Area Control System.

Application of Newton's Approach for Transient Stability Improvement by Using Generation Rescheduling (발전력 재배분을 이용하여 과도안정도를 향상하기 위한 Newton's Approach 응용)

  • Kim, Kyu-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.1
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    • pp.68-75
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    • 2013
  • This paper presents a scheme to improve transient stability using Newton's Approach for generation rescheduling. For a given contingency, the energy margin and sensitivities are computed. The bigger energy margin sensitivity of generator is, the more the generation of the generator effects to the transient stability. According to energy margin sensitivity, the control variables of generation rescheduling are selected. The fuel cost function is used as objective function to reallocate power generation. The results are compared to the results of time simulation to show its the effectiveness.