A Novel Method for the Optimal Parameter Selection of Discrete-Time Switch Model

Reza Razzaghi, Chrysanthi Foti, Mario Paolone, Farhad Rachidi

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


The paper proposes a novel method for the optimal parameter selection of the discrete-time switch model used in circuit solvers that adopt the Fixed Admittance Matrix Nodal Method (FAMNM) approach. As known, FAMNM-based circuit solvers allow to reach efficient computation times since they do not need the inversion of the circuit nodal admittance matrix. However, these solvers need to optimally tune the so-called discrete switch conductance, since this parameter might largely affect the simulations accuracy. Within this context, the method proposed in the paper minimizes the distance between the eigenvalues of the original circuit’s nodal admittance matrix with those associated with the presence of the discrete-time switches. The method is proven to provide values of the discrete-time switch conductance that maximize the simulation accuracy and minimize the losses on this artificial parameter. The performances of the proposed method are finally validated by making reference to two test cases: (i) a circuit composed of RLC elements, (ii) a network model that includes a single-phase transmission line.
Original languageEnglish
Title of host publicationProceedings of the 10th International Conference on Power Systems Transients (IPST 2013)
Subtitle of host publicationVancouver, British Columbia, Canada; July 18-20, 2013
Place of PublicationVancouver, Canada
Number of pages7
Publication statusPublished - 2013
Externally publishedYes
EventInternational Conference on Power Systems Transients 2013 - Vancouver, Canada
Duration: 18 Jul 201320 Jul 2013


ConferenceInternational Conference on Power Systems Transients 2013


  • Discrete-time switch model
  • Modified nodal analysis
  • Fixed admittance matrix nodal method
  • Real-time simulation

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