A new hybrid filter to dampen resonances and compensate harmonic currents in industrial power systems with power factor correction equipment

A new hybrid power filter is presented for three phase industrial power systems which include passive power factor correction equipment (PFC). The hybrid filter damps resonances occurring between line impedances and the PFC. In addition, the hybrid filter topology cam be used to compensate harmonic currents. The capacitors of the PFC, which generally cause resonant problems in harmonic distorted networks, can be used for passive filtering by connecting the magnetizing inductance of a transformer in series. The primary side of the transformer is connected to a low VA-rated three-phase inverter which builds the active part of the hybrid topology. Simulation results and experimental results are presented verifying the damping and harmonic compensation performance of the proposed topology