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1. (WO2013143762) METHOD AND DEVICE FOR REDUCING CURRENT HARMONICS

Pub. No.:    WO/2013/143762    International Application No.:    PCT/EP2013/052927
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Fri Feb 15 00:59:59 CET 2013
IPC: H02M 7/5387
H02M 1/12
H02M 7/219
H02J 3/01
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: PAIS, Guillaume
BACHMAIER, Georg
BACHMANN, Christian
BERGMANN, Dominik
CYRIACKS, Marco
GERLICH, Matthias
GÖDECKE, Andreas
Title: METHOD AND DEVICE FOR REDUCING CURRENT HARMONICS
Abstract:
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 (θ) 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 (θ); 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·θ); 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.