The ac/dc/ac double-stage converter, frequently used nowadays to provide ac adjustable frequency and magnitude volt- ages in the adjustable-speed drives, consists of a voltage source in- verter (VSI) fed by a three-phase diode bridge rectifier; this rec- tifier generates high line current harmonics in the supply system. This paper presents a complete modelling of the VSI-fed drives, when energized by nonsinusoidal supply voltages, based on the analytical form of the current harmonics injected in the supply system; the equations of the current harmonics are obtained for both the continuous and discontinuous current modes and are de- rived by Fourier analysis of steady-state current time evolution. The high accuracy of the proposed models is demonstrated by com- parison with the results of time-domain simulation. The modelling is useful to study the effects of supply voltage distortions on cur- rent harmonics injected in the supply system, both in continuous and discontinuous mode, with a very short computing time.

### Analytical modeling for harmonic analysis of line current of VSI-fed drives

#### Abstract

The ac/dc/ac double-stage converter, frequently used nowadays to provide ac adjustable frequency and magnitude volt- ages in the adjustable-speed drives, consists of a voltage source in- verter (VSI) fed by a three-phase diode bridge rectifier; this rec- tifier generates high line current harmonics in the supply system. This paper presents a complete modelling of the VSI-fed drives, when energized by nonsinusoidal supply voltages, based on the analytical form of the current harmonics injected in the supply system; the equations of the current harmonics are obtained for both the continuous and discontinuous current modes and are de- rived by Fourier analysis of steady-state current time evolution. The high accuracy of the proposed models is demonstrated by com- parison with the results of time-domain simulation. The modelling is useful to study the effects of supply voltage distortions on cur- rent harmonics injected in the supply system, both in continuous and discontinuous mode, with a very short computing time.
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2004
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/11580/12959`
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