A Comparative Study of PWM Strategies for Cascaded Z-Source Multilevel Inverter
Research Area: | Volume 1 Issue 3, May 2012 | Year: | 2012 |
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Type of Publication: | Article | Keywords: | Cascaded Z-source MLI, Third harmonic PWM, THD, Voltage Gain and Voltage stress |
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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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