Application of a nonlinear hybrid controller in multi-machine power system based on a power system stabilizer

Mehrnoush Ahmadi-Zebarjad, Ghazanfar Shahgholian


The power system stabilizer (PSS) is used to generate supplementary control signals for the excitation system in order to
dampen low frequency oscillations. This paper presents an approach to designing a hybrid power system stabilizer (HPSS),
which is a parallel combination of a conventional PSS and a nonlinear control system, to enhance transient stability for multimachine
power systems. The effectiveness and applicability of the proposed approach are examined using a standard multimachine
power system. The nonlinear system simulation results show that the HPSS is more effective than the conventional
PSS in damping oscillations.


Power system stabilizer; Hybrid structure; Multi-machine power system; Nonlinear hybrid control

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