M.S. Djebbar  , H. Benalla  , 
    Rectifiers Comparative Study Between Two Levels and Multilevels PWM Order,
    International Journal of Electrical and Power Engineering,
    Volume 2,Issue 6,
    2008,
    Pages 365-376,
    ISSN 1990-7958,
    ijepe.2008.365.376,
    (https://makhillpublications.co/view-article.php?doi=ijepe.2008.365.376)
    Abstract: The research presents a comparative study between two and three levels commanded PWM rectifiers current. The study is based on the performance analysis of each type of rectifier, through cascades made up of 2 and 3 levels commanded PWM rectifiers and three-phase structure NPC inverters, fuelling a three-phase asynchronous motor, regarded as a burden-phase balanced the output of the inverter. For that we present at first  deal  with  modeling and control of 2 types  of  rectifiers. At  the  end  we  will  address the problem of the mid-point of the inverter at three levels whose interest to have a stable system of tension at the terminals of the machine. The simulation results obtained are quite satisfactory.
    Keywords: Three-level inverter;Neutral-Point-Clamped-NPC;Pulse-Width Modulation (PWM)