Effect of nonlinearities on the dynamic performance of a synchronous generator — A case study

This article outlines some findings from studies and testing done for a 38MW generator connection to the transmission network of Powerlink Queensland, Australia. Connection studies are done to make sure that the online dynamic performance of the generator complies with the Australian National Electricity Rules requirements when generator is operated in the entire range of its capability diagram. Settling time of generator terminal voltage varies with operating point (active and reactive power output) of the generator and the system (network) conditions. The studies explained in this paper show that the dynamic response of the generator will also depend on the set point of the terminal voltage. The effect of generator and exciter saturation is discussed.