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A new local control strategy with non-linear optimal controllers for a multimachine system is presented. Non-linear Field Voltage Controllers (NFVC) are designed with the use of the feedback linearization approach to adjust generator state variables to external reference signals resulting from optimal power flow calculation [Pi, Qi, Vti] in the stabilized power system. A non-linear control law has been derived for the three-dimensional [δ, ω, E′q] one-axis model of a generator. The local control strategy has been verified for the New England 39 bus system. An extensive simulation study shows robustness of the non-linear controllers and better performance than PSS-based classical controllers. © 1997 John Wiley & Sons, Ltd.

The problem of synthesizing a field voltage controller for a synchronous generator is considered. Using the theory of feedback linearization of nonlinear systems, the existence of a linearizing feedback for an improved reduced-order three-dimensional model of a generator is proved and the most simple form of this feedback is derived. An application of the obtained nonlinear control law to synchronous generator stabilization gives very good results, not only for the reduced-order model but also for the ‘exact’ Park's model of a generator. Simulations of fault and post-fault transients in the obtained control system with the synchronous generator ( P = 360 MW), in the presence of a nonlinear state observer and field voltage limiters confirmed superiority of this control system as opposed to a system with a linear optimal controller.

The problem of non-linear field voltage controller synthesis for a synchronous generator is considered. The theory of feedback linearization of non-linear systems is applied and the existence of a linearizing feedback controller for the improved reduced-order three-dimensional model of a generator is proved. Simulation results for the proposed non-linear controller, which includes a non-linear observer and two systems based on an automatic voltage regulator and a power system stabilizer, are presented.