Reserve requirements to efficiently manage intra-zonal congestion

Joshua D. Lyon, Kory Hedman, Muhong Zhang

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


The security-constrained unit commitment problem schedules power generators to minimize cost subject to operating constraints. Reserve requirements ensure that reserve is available to re-balance the system following a contingency but do not guarantee reliability in congested systems where reserve activation is limited by transmission constraints. Operators improve reserve deliverability by limiting power ows and controlling the location of reserves. Zones are used to address inter-zonal congestion but operators lack efficient ways to handle intra-zonal congestion. We propose dynamically relating minimum reserve levels to transmission stress in a computationally efficient approach that complements existing reserve models from the literature. Analysis on the IEEE RTS 96 test case demonstrates the approach can mitigate intra-zonal congestion more economically than traditional reserve policies.

Original languageEnglish (US)
Article number6587575
Pages (from-to)251-258
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number1
StatePublished - Jan 2014


  • Congestion management
  • operating reserve
  • optimization
  • power system economics
  • power system reliability
  • power system security
  • reserve requirements
  • unit commitment

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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