Nonlinear AVR for power system stabilisers robust phase compensation design

Phase characteristics of the generator-exciter-power (GEP) system with a conventional automatic voltage regulator (AVR) varies significantly with operating condition (OCs). In this study, a novel modification in the conventional excitation controllers (first-order AVR, ST1A and AC1A) is presented. The authors found that the GEP phase responses are robust over a wide range of OCs yielding a robust phase compensation design for power system stabiliser. Additionally, they observed improved small-signal stability without affecting the transient stability. Simulation results are presented on SMIB, IEEE 39- and 68-bus power systems, wherein a detail sub-transient model of synchronous generator is considered.

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