Simulations of Non-Linear Resistance De-Excitation of Synchronous Generators

De-excitation with non-linear resistance is usually adopted in large synchronous generators.This paper describes the Matlab Mathematical simulation models of the de-excitation with non-linear resistance with consideration given to the nonlinearity of no-load characteristic of generator and the induction effect of rotor damper winding.The de-excitation simulation of a 667 MW hydro-turbine generator in the Pubugou Hydropower Station is conducted with curves of the field current and voltage and the damping winding current on the d-axis obtained.At the same time,the magnetic energy absorbed by de-excitation resistor,field winding and damping winding on d-axis,the de-excitation time are also obtained,so a true and visual observation of the de-excitation process is provided.