Instantaneous power theory applied to power conditioning under distorted mains voltages: A MATLAB/simulink approach

The paper presents some problems and solutions for instantaneous power theory applied to active power conditioning under distorted mains voltages in a MATLAB/Simulink approach. Simulation of a real system is made, namely a transformer which feeds a controlled rectifier bridge in an excitation system from a power system generator group, based on measurements acquired with a dedicated data acquisition system. Replacing the old auxiliary excitation generator eliminates the disadvantage of using electrical machines with the mass in motion inertia and wear over time, but with the price of facing two important problems: the line voltage notching due to thyristor switching and also the distorting of line current. The MATLAB/Simulink model allows for testing the instantaneous power theory implementation and dealing with problems arising with distortion of mains voltages, respectively observing its effectiveness based on the results.