Investigative uses of overmodulation techniques in modular multilevel cascaded converter

Mohan P. Thakre, Jayesh A. Gangurde, Rakesh Shriwastava, Deepak P. Kadam, Sunil Somnath Kadlag, Haridarshan S. Sonawane

Abstract


Sinusoidal pulse width modulation (SPWM) is a method to generate the switching gate pulse of the converter. Overmodulation is a method where the modulation index exceeds the unity value and the system goes into the nonlinear region. To maintain the system in a linear region when operating in the overmodulation region, some techniques are developed. These techniques helped to operate the system in the linear range. Medium and high-power energy conversion systems mostly use a modular multilevel cascaded converter (MMCC), which has been an issue improving significantly in recent years. In this article, MMCC-based overmodulation techniques are compared with conventional PWM and analyzed on DC bus utilization (DBU), and total harmonic distortion (THD). MATLAB/Simulink digital platform used demonstrate overmodulation technique.

Keywords


CHB; MMCC; Sinusoidal PWM; UDB

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DOI: https://doi.org/10.11591/eei.v11i6.3958

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Bulletin of Electrical Engineering and Informatics (BEEI)
ISSN: 2089-3191, e-ISSN: 2302-9285
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