Gravitational search algorithm for coordinated design of PSS and TCSC as damping controller

M. Eslami, H. Shareef, A. Mohamed, M. Khajehzadeh

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


A newly developed heuristic global optimization algorithm, called gravitational search algorithm (GSA), was introduced and applied for simultaneously coordinated designing of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) as a damping controller in the multi-machine power system. The coordinated design problem of PSS and TCSC controllers over a wide range of loading conditions is formulated as a multi-objective optimization problem which is the aggregation of two objectives related to damping ratio and damping factor. By minimizing the objective function with oscillation, the characteristics between areas are contained and hence the interactions among the PSS and TCSC controller under transient conditions are modified. For evaluation of effectiveness and robustness of proposed controllers, the performance was tested on a weakly connected power system subjected to different disturbances, loading conditions and system parameter variations. The eigenvalues analysis and nonlinear simulation results demonstrate the high performance of proposed controllers which is able to provide efficient damping of low frequency oscillations.

Original languageEnglish
Pages (from-to)923-932
Number of pages10
JournalJournal of Central South University of Technology (English Edition)
Issue number4
Publication statusPublished - Apr 2012
Externally publishedYes


  • Gravitational search algorithm
  • Power system stabilizer
  • Thyristor controlled series capacitor
  • Tuning

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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