The active power quality filters developed by ABB offer the unprecedented ability to eliminate up to 20 harmonics from the network. The PQF is easy to expand and adapt to changes in the network. The PQF monitors the line current in real time and processes the measured harmonics as digital signals in a high-power multi-DSP (Digital Signal Processor). The output of the multi-DSP generates PWM (Pulse Width Modulated) signals that drive IGBT power modules which, through line reactors, inject harmonic currents with exactly the opposite phase to those that are to be filtered. The net effect is an elimination of the harmonics and a clean sine-wave as seen by the feeding transformer. The PQF is UL approved.
Active Filter Product Range