A novel multilevel DC-link three-phase T-type inverter

Saddam Shueai Alnamer, Saad Mekhilef, Hazlie Mokhlis, Nadia M.L. Tan

Research output: Journal PublicationArticlepeer-review

4 Citations (Scopus)


This research proposes a four-level T-type inverter that is suitable for low-power applications. The presented topology outranks other types of inverters in terms of a smaller number of semiconductor devices, absence of passive components such as clamping diodes and flying capacitors, low switching and conduction losses, and high efficiency. The proposed topology is free from voltage deviation and unbalanced voltage occurrences that are present in other multilevel converters having clamping diodes or flying capacitors. The proposed inverter can extend to N levels using unequal dc-link voltage sources for medium-voltage application. The inverter employs the simple fundamental frequency staircase modulation technique. Moreover, this paper presents a current commutation strategy to prevent the occurrences of short circuit and minimizing the number of required switching devices and switching transitions, resulting in improving the efficiency of the inverter. This paper also analyses the theoretical converter losses showing lower switching and conduction losses when compared to existing four-level inverters. The experimental validation of the proposed inverter shows its operating feasibility and a low output voltage THD.

Original languageEnglish
Article number4186
Issue number6
Publication statusPublished - Aug 2020
Externally publishedYes


  • DC–AC inverter
  • DC–AC power conversion
  • Fundamental frequency staircase modulation
  • PWM modulation technique
  • T-Type inverter
  • Unequal dc voltage supplies

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Fuel Technology
  • Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering


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