Pole Location and Transient Swings in Feedback Linearised Power System Stabilisers

J.T. Agee (Botswana)


: Power system stability; Power system control; Feedback linearisation


Recent trends in power system stabiliser design employ feedback linearising control techniques. However, the placement of closed-loop poles is not systematic. Us ing theorems of real analysis, this paper investigates the effect of the nature and location of closed loop poles on the magnitude of transient swings in PID controlled feedback linearised power system. For the third-order power system model studied, the results here show that for a given integral gain KI, a set of real, equal stable poles leads to minimum amplitude of transient swings about the initial equilibrium; and further that, the phase margin of the power system is reduced when the PID controller leads to a pair of complex closed-loop poles.

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