A Modified Multi-Level Converter for Low Cost High Speed SR Drive

In this paper, a modified multi-level convert for low cost high speed switched reluctance (SR) drive is proposed. The proposed multi-level converter has reduced number of power switches and diodes than that of a conventional asymmetric converter and lower voltage rating of the dump capacitor comparing with the energy efficient c-dump converter. It has five operating modes, boosted, DC-link, zero, negative DC-ink and negative boosted voltage. The proposed multi-level converter has fast excitation and demagnetization modes of phase current, so dynamic response can be achieved as well as a high speed drive. The proposed multi-level converter is verified by computer simulation and experimental results.