Investigative uses of overmodulation techniques in modular multilevel cascaded converter

Mohan P. Thakre (K. K. Wagh Institute of Engineering Education & Research)
Jayesh A. Gangurde (K. K. Wagh Institute of Engineering Education and Research)
Rakesh Shriwastava (Matoshri College of Engineering and Research Center)
Deepak P. Kadam (MET Institute of Engineering)
Sunil Somnath Kadlag (Savitribai Phule Pune University)
Haridarshan S. Sonawane (Government of Maharashtra)

Bulletin of Electrical Engineering and Informatics
Vol 11, No 6: December 2022

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.