Reactive power compensation for restoring power flow solvability in severe contingencies

Sangsoo Seo, Byongjun Lee, Hwachang Song, Tae Kyun Kim, Baekseok Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In power system operation, maintaining power flow solvability is important. In the recent deregulated environment, uncertainty has become more prevalent in power systems because of diverse power transactions and benefit-based operational schemes. Thus, in the present and future power industry, there may be more unsolvable cases than there were in the past integrated power industry. This paper presents a methodology to determine the adequate reactive power compensation for restoring power flow solvability in the unsolvable severe contingencies. To analyze power flow solvability, a continuation power flow tool parameterizing branch parameters of contingencies is applied. In solvable cases, the adequate locations of the additional reactive power injection are determined by sensitivity analysis based on the normal vector at the nose point of the independent parameter vs. V curves, constructed by the continuation power flow tool. The effectiveness of the sensitivity information is verified by comparing the amount of reactive power compensation at each location. In a case study, the proposed algorithm is applied to the Korea Electric Power Corporation (KEPCO) Systems. Index Terms - Branch parameter continuation power flow, branch parameter parameterization, reactive power compensation, restoring power flow solvability, contingency screening, voltage stability.

Original languageEnglish
Title of host publication2005 IEEE Russia Power Tech, PowerTech
Publication statusPublished - 2005
Event2005 IEEE Russia Power Tech, PowerTech - St. Petersburg, Russian Federation
Duration: 2005 Jun 272005 Jun 30

Publication series

Name2005 IEEE Russia Power Tech, PowerTech


Other2005 IEEE Russia Power Tech, PowerTech
Country/TerritoryRussian Federation
CitySt. Petersburg


  • Branch parameter continuation power flow
  • Branch parameter parameterization
  • Contingency screening
  • Reactive power compensation
  • Restoring power flow solvability
  • Voltage stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering


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