Substation-Level Grid Topology Optimization Using Bus Splitting

Yuqi Zhou, Ahmed Zamzam, Andrey Bernstein, Hao Zhu

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations


Operations of substation circuit breakers are important for maintenance needs and topology reconfiguration in power systems. Bus splitting is one type of topology change where the two bus bars at a substation can become electrically disconnected under certain actions of circuit breakers. Because these events involve detailed substation modeling, they are typically not considered in routine power system operation and control. In this paper, an improved substation-level topology optimization framework is developed by expanding traditional line switching decisions by breaker-level bus splitting, which can further reduce grid congestion and generation costs. A tight McCormick relaxation is proposed to reformulate the bilinear terms in the resultant optimization problem to linear inequality constraints. Thus, a tractable mixed-integer linear program reformulation is attained that allows for efficient solutions in real-time operations. Numerical studies on the IEEE 14-bus and 118-bus systems demonstrate the computational performance and economic benefits of the proposed topology optimization approach.

Original languageAmerican English
Number of pages7
StatePublished - 25 May 2021
Event2021 American Control Conference, ACC 2021 - Virtual, New Orleans, United States
Duration: 25 May 202128 May 2021


Conference2021 American Control Conference, ACC 2021
Country/TerritoryUnited States
CityVirtual, New Orleans

Bibliographical note

See NREL/CP-5D00-78184 for preprint

NREL Publication Number

  • NREL/CP-5D00-80741


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


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