Control strategy of hybrid power filter under disturbed voltage system conditions

In the paper a combined feedback and feedforward control strategy of the parallel hybrid power filter (HPF) is presented, which features a small sensitivity against a disturbed supply voltage system and enables us to set grid phase currents in the phase with respective voltages. The experimental data show that the modified control strategy yields better results than those obtained by using the control system reported previously, especially in case of an unsymmetrical and non-sinusoidal voltage system and the demand of zero reactive power withdrawn from the grid.