Simulation research on excitation control law based on large hydro-generator including magnetic saturation

To accurately consider nonlinear feature of synchronous generator in studying the interaction of the generators and power network under the condition of disturbance or faults, a field-circuit-network coupled time-stepping finite element (T-S FEM) model. In order to research the magnetic saturation on dynamic characteristics of hydro-generators and excitation control law, the disturbance of generator was calculated using classic Park equation and time-stepping finite element method (T-S FEM) model respectively. The result show that, without considering magnetic saturation, the disturbance characteristics obtained by different models were basically identical, however the difference was significant if they are considered.