A Comparative Study of PWM Strategies for Cascaded Z-Source Multilevel Inverter

Research Area: Volume 1 Issue 3, May 2012 Year: 2012
Type of Publication: Article Keywords: Cascaded Z-source MLI, Third harmonic PWM, THD, Voltage Gain and Voltage stress
Authors:
  • Dr. R. Seyezhai
  • Dr. B. L. Mathur
  • A. Shanmuga Priyaa
Journal: IJEIR Volume: 1
Number: 3 Pages: 218-225
Month: May
ISSN: 2277-5668
Abstract:
Multilevel Inverter (MLI) is an effective topology for high voltage DC-AC conversion. It synthesizes a desired voltage wave shape from several levels of DC voltages. But the main disadvantage of MLI is its output voltage amplitude is limited to DC sources voltage summation. Therefore, a five-level symmetric cascaded multilevel inverter based Z-source inverter has been proposed in this paper. In the proposed topology output voltage amplitude can be boosted with Z network shoot-through state control. This paper focuses on Unipolar, bipolar and Third harmonic injection PWM strategies for the proposed topology. The performance of Z -Source MLI has been analyzed for various modulation strategies. A simulation model of conventional cascaded multilevel inverter and Z-source MLI has been built in MATLAB/SIMULINK.

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