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Robust power system stabilization using Kharitonov’s extremal gain margin theorem.

This paper proposes a method for designing robust power system stabilizers which will be able to damp-out oscillations in electric power systems.

Year of Publication2009

A major problem in the operation of electric power transmission systems is the take-up of effective measures for restoring the system's stability. To this end, this paper proposes a method for designing robust power system stabilizers (PSS) which will be able to damp-out oscillations in electric power systems. Oscillations of small magnitude and low frequency, linked with the electromechanical modes in power systems, often persist for long periods of time and in some cases present limitations on the power transfer capability. The proposed PSS is designed according to Kharitonov's extremal gain margin theory. It has the following advantages: (i) it is based on simultaneous stabilization of limited number of extreme plants, (ii) the control design can be based on frequency response analysis techniques (root locus diagrams or Nyquist plots), (iii) the resulting controller is a low-order phase lead ompensator, which is robust to the change of operating points. The power system stabilizer is tested through simulation experiments.

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power system stabilisationsingle machine infinite bus modelkharitonov s theoryoscillations
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