Clustered Effective Reactive Reserve to Secure Dynamic Voltage Stability in Power System Operation

Bohyun Park, Seunghyuk Im, Dohyuk Kim, Byongjun Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Reactive power reserves are important for grid stability and have a variety patterns depending on fault location as power systems become larger and complex. This paper presents the clustered effective reactive reserve (CEQR), an indicator that is suitable for identifying the risk of dynamic voltage stabitlity in terms of power system operation. This indicator provides the following features: i) It calculate the local realistic reactive reserve to recognize dynamically changing system conditions; ii)it derive clustered areas to identify valid regions for system control. The proposed method uses the sensitivity between dynamic reactive resources or load buses and a particular bus to obtain the correlation. And since this indicator is calculated using only the system topology, current and maximum outputs of the generators, there is less computational burden. This study verified the features of clustered effective reactive reserve (CEQR) by analyzing the practicable dynamic voltage collapse scenarios in the Korean electric power (KEPCO) system. In addition, as a countermeasure against the dynamic voltage collapse, the control performance of blocking tap changer scheme using the proposed indicator is described.

Original languageEnglish
Article number9180091
Pages (from-to)1183-1192
Number of pages10
JournalIEEE Transactions on Power Systems
Issue number2
Publication statusPublished - 2021 Mar

Bibliographical note

Publisher Copyright:
© 1969-2012 IEEE.


  • Power system stability
  • blocking tap changer
  • clustering
  • power system protection
  • reactive power reserve
  • sensitivity

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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