《《A Simple Space Vector PWM Generation Scheme for Any General n-Level Inverter》.pdf

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 56, NO. 5, MAY 2009 1649 A Simple Space Vector PWM Generation Scheme for Any General n-Level Inverter Aneesh Mohamed A. S., Anish Gopinath, and M. R. Baiju, Member, IEEE Abstract—This paper proposes a generalized method for the tion, and optimum-switching-sequence selection for the in- generation of space vector pulsewidth modulation (SVPWM) sig- verter voltage vectors [7]–[20], [23]. The sector identification nals for multilevel inverters. In the proposed method, the actual can be done by coordinate transformation [8], [9], [16] or sector containing the tip of the reference space vector need not be identified. A method is presented to identify the center of a by repeated comparison of the three phase reference voltages subhexagon containing the reference space vector. Using the center [7], [15]. The lookup tables can be used for determining the of the subhexagon, the reference space vector is mapped to the switching vectors in optimum switching sequence [6]–[20]. The innermost subhexagon, and the switching sequence corresponding calculation of the duration of the switching vectors can be to a two-level inverter is determined. A new technique is proposed simplified using the mapping technique, in which the identified in this paper, by which these two-level vectors are translated to the switching vectors of the multilevel inverter by adding the center of sector of the multilevel inverter is mapped to a corresponding the subhexagon to the two-level vectors. The proposed method can sector of the two-level inverter [13]–[15], [23]. be extended to any n