Active filter device for suppressing harmonics in a power supply system, which has a capacitive load

摘要

an active filter (6) oberwellenstromkomponenten suppressed, by a power supply (1) is, to a kompensationslast (2) coupled to the oberwellenkomponentenquelle (3) and a capacitive load (4) contains.the active filter (6) provides a compensating currents (ic) in accordance with an output signal of a subtrahiergliedes (8), with current transformers (5, 7) for recording each of laststromes (il), and a capacitive laststromes (if) is connected.this corresponds to the active filter (6) supplied by compensating currents (ic) of the oberwellenkomponentenquelle (3) generated oberwellenstromkomponenten and compensates for this. the capacitive load current (if) of the steuervorgang excluded. thus, a positive feedback of the system is avoided, and it can obtain a stable steuervorgang.