A Simplified Analytical Algorithm in abc Coordinate for the Three-Level SVPWM

Given the high complexity of the conventional three-level space-vector pulsewidth modulation (3L SVPWM), simplified SVPWM algorithms are usually adopted instead. However, existing simplifications for 3L SVPWM still have a large computation burden, which limits its applications, e.g., in high-switching-frequency silicon-carbide converters with a short computation period. In this letter, based on a typical simplified algorithm known as the center-aligned 3L SVPWM, a simplified analytical algorithm in abc coordinate is proposed. The reference-voltage-vector adjustment and the calculation of modulation waves are unified based on the center-aligned SVPWM. The modulation waves can be analytically derived by only eight simple equations, without sector determination, calculation, and assignment of dwell times. Consequently, the complexity of implementing the 3L SVPWM is significantly reduced.

Automated summary

A simplified analytical algorithm in abc coordinate based on the center-aligned 3L SVPWM was proposed to reduce the complexity of implementing 3L SVPWM. By unifying the adjustment of reference-voltage vectors and the calculation of modulation waves, the modulation waves can be analytically derived with only eight simple equations. Thus, the computation burden of simplified 3L SVPWM is significantly reduced.