Ashish R. Bendre Giri Venkataramanan Don Rosene Vijay Srinivasan Modeling and design of a neutral-point voltage regulator for a three-level diode-clamped inverter using multiple-carrier modulation. 718-726 2006 53 IEEE Trans. Ind. Electron. 3 https://doi.org/10.1109/TIE.2006.874424 db/journals/tie/tie53.html#BendreVRS06