Voltage mode stabilisation in power systems with dynamic loads

M. J. Hossain, H. R. Pota, V. A. Ugrinovskii, R. A. Ramos

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


This paper presents a novel modelling and excitation control design to enhance large-disturbance voltage stability in power systems with significant induction motor (IM) loads. The excitation controller is designed using minimax linear quadratic Gaussian (LQG) controller synthesis method. The nonlinear power system model is reformulated with a linear and a nonlinear term. The nonlinear term is the Cauchy remainder in the Taylor series expansion and its bound is used, in this paper, in a robust control design. An advantage of this approach over the existing linearisation scheme is the treatment of the nonlinear dynamic load model in a rigorous framework for excitation control design. The performance of the designed controller is demonstrated by large disturbance simulations on a benchmark power system for various types of loads.

Original languageEnglish
Pages (from-to)911-920
Number of pages10
JournalInternational Journal of Electrical Power and Energy Systems
Issue number9
Publication statusPublished - Nov 2010
Externally publishedYes


  • Dynamic load
  • Dynamic voltage stability
  • Linearisation
  • Minimax LQG Control
  • Nonlinearity
  • Robust excitation control


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