Power line harmonic reduction by hybrid parallel active/passive filter system with square wave inverter and DC bus control

摘要: A hybrid parallel active/passive filter system (30) is provided which provides line power harmonic isolation and compensation for systems connected to high non-linear loads (38). The includes a passive (50, 52) in series with an active inverter (54, 56). 56) controlled generate voltages such that the terminal voltage tracks supply harmonics at selected dominant frequency regulate current zero. synchronous reference frame (SRF) based controller used commands on measured values. feed forward command signal generator may be improve response of control system. preferably implemented as square-wave inverter. DC bus achieve balancing provide real compensate losses