Analysis and carrier-based modulation of Z-source NPC inverters

Seyed Mohammad Dehghan, Mustafa Mohamadian, Reza Gharekhani

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Multi-level neutral-point-clamped (NPC) inverters are widely used in high and medium voltage applications. However, these inverters are only buck-type converters. Recently z-source NPC inverters have been proposed as the buck-boost three-level inverter. New inverters use a z-source network as the input stage. This article analyses the features and limitations of two main topologies of z-source NPC inverters (dual z-source network NPC inverter and single z-source network NPC inverter). The low-frequency ripple of the inductor current and the capacitor voltage of the z-source networks in the z-source NPC inverters are surveyed. This article also proposes two novel PWM methods for the z-source NPC inverters, which can be easily implemented experimentally. In the proposed methods, generated switching signals for the conventional NPC inverter are modified for the z-source NPC inverter using a simple logic circuit considering the boost factors and the power sharing ratio. The performance of the proposed simple PWM methods is verified by simulation and experimental results.

Original languageEnglish
Pages (from-to)1075-1099
Number of pages25
JournalInternational Journal of Electronics
Issue number8
Early online date15 Feb 2012
Publication statusPublished - 1 Aug 2012
Externally publishedYes


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