Performance of a Shunt Active Power Filter for Unbalanced Conditions Using Only Current Measurements

Shunt active power filters (APFs) are used to address quality issues such as harmonic distortion and system imbalance. Many control systems for shunt APFs demand measurements of voltages currents the determination instantaneous real reactive signals. From these signals, reference APF calculated. A method that only measures is proposed in this paper. The includes a modified technique extract positive negative sequence components time domain. calculated by measured currents. Simulation experimental results confirm efficiency scheme under ideal non-ideal conditions.