Identification of nonlinear Hammerstein-Wiener model for representing a field voltage-terminal voltage relation of synchronous generator

This paper demonstrates the identification of nonlinear Hammerstein-Wiener model which is applied for modelling the relation between field and terminal voltage of the synchronous generator. The field voltage of the generator stands for the input data for the nonlinear model, while the terminal voltage represents the output data. The parameters of the used nonlinear model are determined using Levenberg-Marquardt algorithm. Identification procedure is based on recording field and terminal voltage responses on reference voltage step disturbances. The proposed procedure is tested on simulation model of the 40 MVA synchronous generator from hydro power plant Perucica, realized in Matlab Simulink software, which is also experimentally verified. In order to validate the identified model, two additional tests were performed-one with the different controller parameters and other with different step disturbance on reference voltage. The presented results clearly indicate that the nonlinear Hammerstein-Wiener model accurately and precisely can determine the relation between field and terminal voltage of the generator.