Title :
A primary-switched line-side converter using zero-voltage switching
Author :
Kjær, Philip C. ; Norrga, Staffan ; Östlund, Stefan
Author_Institution :
Dept. of Power Eng., ABB Corp. Res., Vasteras, Sweden
Abstract :
A new primary-switched AC/DC power converter and its modulation are presented. It employs a single- or three-phase transformer, with a matrix converter (primary) and a conventional two-level converter (secondary). This allows galvanic isolation at medium-frequency zero-voltage primary commutation and five line-side voltage levels. Two distinct modulation methods are explained in detail, and it is shown how a combination of these allows optimal operation in terms of efficiency and voltage harmonics. Measured waveforms on a 30-kW prototype confirm the expected performance
Keywords :
AC-DC power convertors; commutation; electric propulsion; harmonic distortion; modulation; power conversion harmonics; power transformers; railways; rectifying circuits; switching circuits; thyristor convertors; 1 MVA; 30 kW; ZVS; control strategy; efficiency; galvanic isolation; line-side voltage levels; medium-frequency zero-voltage primary commutation; modulation; optimal operation; power convertor waveforms; primary-switched AC/DC power converter; single-phase transformer; three-phase transformer; voltage harmonics; zero-voltage switching; Frequency; Galvanizing; Insulated gate bipolar transistors; Matrix converters; Power harmonic filters; Propulsion; Rail transportation; Switching converters; Thyristors; Zero voltage switching;
Journal_Title :
Industry Applications, IEEE Transactions on
