Substation-Level Grid Topology Optimization Using Bus Splitting: Preprint

Yuqi Zhou, Ahmed Zamzam, Andrey Bernstein, Hao Zhu

Research output: Contribution to conferencePaper


Operations of substation circuit breakers are of high significance for performing system maintenance and topology optimization. Bus splitting is one type of topology changes where the two bus-bars at a substation become electrically disconnected after certain actions of circuit breakers. As these events involve detailed substation modeling, they are not typically considered in power system routine operation and control. In this paper, an improved substation-level topology optimization is developed by expanding traditional line switching with breaker-level bus splitting, which can further reduce grid congestion and generation costs. A tight McCormick relaxation is proposed to reformulate the bi-linear terms in the resultant topology optimization model. Thus, a tractable mixed-integer linear program formulation is presented which can be efficiently solved for real-time control. Numerical studies on the IEEE 14-bus and 118-bus systems demonstrate the performance and economic benefits of the proposed topology optimization approach.
Original languageAmerican English
Number of pages10
StatePublished - 2021
Event2021 American Control Conference -
Duration: 25 May 202128 May 2021


Conference2021 American Control Conference

Bibliographical note

See NREL/CP-5D00-80741 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-78184


  • bus split
  • circuit breakers
  • grid topology control
  • McCormick relaxation
  • optimal transmission switching


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