SCALABLE UNIVERSAL SPACE VECTOR PULSE WIDTH MODULATION SCHEME FOR MULTILEVEL INVERTERS

Authors

Wei Qiao, Lincoln, NE
Fa Chen, Lincoln, NE
Liyan Qu, Lincoln, NE

Document Type

Article

Date of this Version

2-25-2020

Citation

Patent NO.: US 10,574,154 B1

Abstract

A scalable universal space vector pulse-width modulation (SVPWM) scheme for multilevel inverters is disclosed. In the disclosed SVPWM scheme, the modulation triable is quickly identified based on a coordinate transformation from an α-β coordinate system to a 120^o oblique coordinate system. Then, the duty cycles and switching states of the three vertices of the modulation triangle are determined by simple algebraic computations. In a switching period, any vertex of the modulation triangle can be flexibly selected as the start point to optimize the switching sequence with flexibly adjustable duty cycle(s) for the redundant switching state(s) according to specific applications.