Analysis and simulation of line notching attenuation for a static excitation system in a power system

This paper presents measurements of power quality indices for a static excitation system composed of a transformer and a controlled rectifier bridge in a power system generator group and the corresponding MATLAB/Simulink simulation. Replacing the old auxiliary excitation generator eliminates the disadvantage of using electrical machines with inertial moving masses and wear over time, but with the price of facing two important problems: the line voltage notching due to thyristor switching and the line current distorting. Theoretical aspects of line notching and several solutions for compensation strategies (and their limitations) are discussed. The MATLAB/Simulink model made possible the implementation of the solution selected to deal with these problems and to evaluate its effectiveness based on the results.