METHOD AND DEVICE FOR REDUCING CURRENT HARMONICS

摘要

The invention relates to a method and a device for reducing current harmonics in harmonic frequencies of a fundamental frequency (f0), said frequencies being produced by an AC/DC converter (2) which can be connected to a multiphase system (1). The method has the following steps: detecting (S1) a voltage angle (theta) and phase currents (Ia, Ib, Ic) of the multiphase system (1); calculating (S2) a fundamental space vector (RZi) for the fundamental frequency (f0) of the measured phase currents (Ia, Ib, Ic) using the detected voltage angle (theta); calculating (S3) additional space vectors (RZi) for harmonic frequencies (fi) of the measured phase currents (Ia, Ib, Ic) using harmonic multiples of the detected voltage angle (h·theta); adding (S4) the calculated space vectors (RZ0, RZi) of the fundamental frequency (f0) and of the harmonic frequencies (fi) in order to calculate a sum space vector (SRZ); generating (S5) PWM control signals dependent on the calculated sum space vector (SRZ); and controlling (S6) the AC/DC converter (2) of the multiphase system (1) using the generated PWM control signals.