• Title/Summary/Keyword: Transient stability EMTP

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Transient Stability Enhancement under Microgrid Environment using P-w Droop Control for Inverter-based Distributed Generation (마이크로그리드 환경에서 인버터기반 분산전원의 P-w 드룹 제어를 통한 과도안정도 향상 대책)

  • Lee, Young-Woo;Kim, Seung-Wan;Jin, Young-Gyu;Yoon, Yong-Tae
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.149-150
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    • 2015
  • 소규모 분산전원 및 에너지 저장장치로 구성된 마이크로그리드는 에너지 자급자족이 가능한 특징을 가지며 계통연계 혹은 독립운전 모드로 운전이 가능하다. 마이크로그리드를 계통연계 모드로 운전하는 경우, 상위 계통에서 사고 발생 시 마이크로그리드 내 동기기의 과도안정도 문제가 발생할 수 있다. 이 때 인버터 기반 분산전원의 빠른 응답 속도를 활용하면 인접 동기기의 유효출력을 효과적으로 제어하여 계통연계 모드를 유지하면서도 과도안정도를 유지할 수 있다. 본 연구에서는 인버터 기반 분산전원의 P-w 제어를 통해, 정상 운전시에는 정해진 전력을 공급하면서 사고 시에는 인접 동기기의 과도안정도를 향상시킬 수 있는 제어 방법을 제안하였다. 또한 실제 적용 가능성을 확인하기 위해 ATP/EMTP프로그램을 이용하여 계통을 구성하고 해석하였다.

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An Investigation of Characteristics of the Operating Modes of Two-Module Thyristor Controlled Series Compensator

  • Chung, Gyo-Bum
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.903-908
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    • 1998
  • This paper aims at investigating the characteristics of the operating modes of two-module Thyristor Controlled Series Compensator (TCSC) in a power transmission system. The operating modes of two-module TCSC are defined, analyzed and compared to those of single-module TCSC are defined, analyzed and compared to those of single-module TCSC. The load flow program, the stability calculation program and Electro Magnetic Transient Program (EMTP) simulation of a TCSC power transmission system are developed for the performance evaluation of two-module TCSC as a power flow controller. In the process of the simulation study, the potential problem areas of the TCSC power transmission system are identified.

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Line Impedance Analysis of Underground Cable in Power Plant (발전소에 포설된 케이블 선로 임피던스 분석)

  • Ha, C.W.;Han, S.H.
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.612-613
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    • 2007
  • The line impedance is important data that are applied in all analysis fields of electric power system such as power flow, fault current, stability and relay calculation etc. Usually, the impedance can be accurately calculated in case of overhead line. However, in case of power cables or combined transmission lines, the impedance can not be accurately calculated because cable systems have the sheath, grounding wires, and earth resistances. Therefore, if there is a fault in cable system, these terms will severely be caused many errors for calculating impedance. In this paper, the line impedance is measured in a power system of underground cables, and is analyzed by a generalized circuit analysis program, EMTP(Electromagnetic Transient Program), for comparison with the measured value. These analysis results are considered to become foundation of impedance calculation for underground cables.

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