Experimental investigation of effectiveness of series active filters for compensation of uncertain harmonic sources

This paper demonstrates the effectiveness of a series active filter (SAF) for suppression of harmonic currents generated by multiple uncertain harmonic sources. The topology is based on a voltage source inverter (VSI). The SAF is controlled by employing digital loss-less resonator in order to realize a high gain to suppress the harmonic components in the source current. The PWM technique is used to generate the required gate drive signals to the VSI. Both of the extraction of harmonics and control are carried out using a Digital Signal Processor (DSP). The effectiveness of the proposed method is clarified analytically and verified by experiments.