A new hybrid filter to dampen resonances and compensate harmoniccurrents in industrial power systems with power factor correctionequipment

摘要

A new hybrid power filter is presented for three phase industrialnpower systems which include passive power factor correction equipmentn(PFC). The hybrid filter damps resonances occurring between linenimpedances and the PFC. In addition, the hybrid filter topology can benused to compensate harmonic currents. The capacitors of the PFC, whichngenerally cause resonant problems in harmonic distorted networks, can benused for passive filtering by connecting a transformer with a lownmagnetizing inductance in series hence creating a single harmonic trap.nThe primary side of the transformer is connected to a low VA-ratednthree-phase current controlled inverter which builds the active part ofnthe hybrid topology. Simulation results and experimental results arenpresented verifying the damping and harmonic compensation performance ofnthe proposed topology