Mixed Transient Stability Analysis Using AC and DC Models

Soobae Kim, Thomas J. Overbye

Research output: Contribution to journalArticlepeer-review


This paper presents a modified method for power system transient stability analysis, allowing the reduction of the computational requirements while retaining important system dynamics. The approach formulates the power balance equations depending on the area of interest. The detailed ac model, including full real and reactive power equations, is used for the area in which high accuracy is required, while the simpler dc model, including linear real power equation, is used for more remote areas where real power dynamics dominate. A high level of accuracy can be achieved using the ac model in the area of interest, and computational complexity can be reduced with the less detailed dc model in the remainder of the system. In order to prevent the loss of simulation accuracy, this paper proposes a way to compensate line losses neglected using the dc model. Case studies with the IEEE 118-bus system are provided to validate the performance of the proposed method.

Original languageEnglish (US)
Article number7094311
Pages (from-to)942-948
Number of pages7
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - Mar 2016


  • Ac power flow
  • dc power flow
  • mixed approach
  • transient stability simulation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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