SVPWM for Three-Level Neutral-Point-Clamped Inverter Based on Improved Space Voltage Vector Mapping

The conventional space vector pulse width modulation used in three-level (3L) inverter has the disadvantages of large computational burden and high cost. In this paper, improved space vector modulation (ISVM) based on space vector mapping is proposed. The 3L space vector diagram (SVD) is mapped to six two-level (2L) SVDs through space vector mapping. The space vector action time in 3L SVD is transferred to 2LSVD for calculation, which greatly simplifies the calculation burden and further reduces the application cost. Finally, the inverse mapping of 2 L space vector to 3 L space vector is realized by simple logic operation, which simplifies the algorithmic complexity and the switching tube on/off logic relationship. The effectiveness and reliability of the method are verified by simulation.