Research on a Time-Variant Shoot-Through Modulation Strategy for Quasi-Z-Source Inverter

摘要

This letter proposes a time-variant shoot-through pulsewidth modulation strategy for the traditional modulation techniques used in quasi-Z-source inverters. By introducing the proposed strategy into the traditional modulation techniques, like the simple boost modulation, the bus voltage amplitude can be reduced at the nonpeak areas, and the switching loss can be greatly saved to improve system efficiency. Because the output voltage gain can still be guaranteed, the waveform quality is not influenced. At the same time, for the traditional zero states in the proposed strategy are fully used as the shoot-through zero states, the switching times can be evidently reduced and the system efficiency can be further increased. Theoretical analysis and experimental results are presented to verify the real performance.