• Title, Summary, Keyword: Area of severity (AOS)

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Utilization of Energy Storage System based on the Assessment of Area of Severity in Islanded Microgrid

  • Lee, Kyebyung;Yoon, Minhan;Park, Chang-Hyun;Jang, Gilsoo
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.569-575
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    • 2017
  • This paper proposes a method to utilize an energy storage system (ESS) based on the assessment of an area of severity (AOS) to voltage sag. The AOS is defined as a set of the fault positions that can cause voltage sags at many buses simultaneously. The assessment of AOS helps to determine an optimal location of ESS installation to minimize the expected sag frequency (ESF) at concerned buses. The ESS has the ability not only to play traditionally known roles but also to mitigate voltage sag impact on renewable energy sources (RES) in the islanded microgrid. Accordingly, using the proposed method the ESS has additional features to prevent the operation failure of RESs and improve the stability of the microgrid. In order to verify the presented method, a case study was conducted on the sample microgrid system that is modified from an IEEE 57-bus system.

A study on the Placement of Energy Storage System by using Area of Severity Assessment (Area of Severity 평가를 이용한 에너지 저장장치의 위치 결정에 관한 연구)

  • Lee, Kyebyung;Park, Chang-Hyun;Bae, Jong-Il;Lee, Hansang;Cho, Soohwan;Jang, Gilsoo
    • Proceedings of the KIEE Conference
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    • pp.321-322
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    • 2015
  • An area of severity (AOS) assessment is defined as a set of the fault positions that can result in the voltage sag bigger than certain level for sensitive buses simultaneously. Using the AOS assessment, the location of devices for compensating voltage sag can be determined as the site expected to less voltage sag at the sensitive bus. The energy storage system based on the control strategy emulating the traditional synchronous generator can contribute the fault current with fast response. Therefor are of venerability (AOV) can be reduced. The energy storage system installed by the AOS assessment has function which can experience relatively less voltage sag in addition to the conventional role of energy storage.

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Establishment of Preventive Measures against Faults Based on the Area of Severity to Voltage Sags (순간전압강하 가혹지역에 기반한 사고예방 대책 수립)

  • Park, Chang-Hyun;Lee, Kyebyung;Lee, Hansang;Yoon, Dong-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.11
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    • pp.1611-1617
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    • 2015
  • This paper presents an effective approach for establishing countermeasures against voltage sags based on the concept of area of severity. In order to apply preventive measures against faults such as lightning arrester, overhead earth wires and so on, it is important to find optimal points for installing the preventive measures. The optimal points can be determined by the calculation of the area of severity(AOS) to voltage sags and the expected sag frequency per unit length of line. In this paper, an effective method to find optimal points to apply countermeasures against voltage sags is addressed with case studies.

A Study on the method to determine an Area of Severity for Voltage Sag Assessment (순간전압강하 평가를 위한 Area of Severity 구현에 관한 연구)

  • Lee, Kyebyung;Park, Chang-Hyun;Bae, Jong-Il;Lee, Hansang;Cho, Soohwan;Jang, Gilsoo
    • Proceedings of the KIEE Conference
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    • pp.323-324
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    • 2015
  • Voltage sag phenomenon is known as one of the important problems that brought huge economic losses in the modern industry. The voltage sag assessment is to predict an annual expected sag frequency (ESF) at concerned consumers caused by fault in the system. An area of severity (AOS) assessment is defined as a set of the fault positions that can result in the voltage sag bigger than certain level for multi-concerned buses simultaneously. This paper introduces how to determine a method for evaluating the voltage sag performance based on the AOS assessment.

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System-Level Vulnerability Analysis for Commutation Failure Mitigation in Multi-infeed HVDC Systems

  • Yoon, Minhan;Jang, Gilsoo
    • Journal of Electrical Engineering and Technology
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    • v.13 no.3
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    • pp.1052-1059
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    • 2018
  • This paper deals with commutation failure of the line-commutated converter high voltage direct current (LCC HVDC) system caused by a three phase fault in the ac power system. An analytic calculation method is proposed to estimate the maximum permissible voltage drop at the LCC HVDC station on various operating point and to assess the area of vulnerability for commutation failure (AOV-CF) in the power system based on the residual phase voltage equation. The concept is extended to multi-infeed HVDC power system as the area of severity for simultaneous commutation failure (AOS-CF). In addition, this paper presents the implementation of a shunt compensator applying to the proposed method. An analysis and simulation have been performed with the IEEE 57 bus sample power system and the Jeju island power system in Korea.