14-09-2017, 03:47 PM
A series active power filter has been developed and tested which functions as a sinusoidal current source, in phase with the mains voltage. The amplitude of the fundamental current in the serial filter is controlled by the error signal generated between the load voltage and a preset reference. The control allows an effective correction of the power factor, harmonic distortion and regulation of the load voltage. Compared with previous control methods developed for serial active filters, this method is simpler to implement because it is only necessary to generate a sinusoidal current, in phase with the mains voltage, whose amplitude is controlled by the error in the voltage of load. The proposed system has been studied analytically and tested using simulations and computer experiments. In the experiments, it has been found that the filter maintains the line current almost sinusoidal and in phase with the line voltage supply. It also responds very quickly under sudden changes in the load conditions, reaching its steady state in approximately two cycles of the fundamental.