Stabilizing a multimachine system via non-linear voltage controller with the use of a local control strategy

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 [P_i,Q_i, V_ti] 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.