STABILIZING A MULTIMACHINE SYSTEM VIA NONLINEAR 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 Controller s (NFVC) are designed with the use of the feedback linearization appro ach 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 fo r the three-dimensional [delta, omega, E-q'] one-axis model of a gener ator. 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. (C) 1997 John Wiley & Sons, Ltd.