Analysis of a Modified Switching Pattern for Packed U Cell-15 Inverter Topology with Advanced Level Shift Carrier Pulse Width Modulation Techniques

This paper focused on the design and analysis of a modified switching sequence for a 15-level Packed U Cell (PUC-15) inverter. The proposed switching sequence improved the harmonic spectrum, reduced the burden on switches, and controlled the switching frequency. The performance of the inverter was also observed in terms of total harmonic distortion (THD) with constant frequency (phase disposition [PD] and phase opposition disposition [POD]) and variable frequency, variable frequency carrier opposition (VFCO) level shift triangular carrier-based sinusoidal pulse width modulation (SPWM) techniques at different modulation indices of M = 0.2, 0.4, 0.6, 0.8, and 1. Insights from the modified switching sequence and pulse width modulation techniques were analyzed and compared via simulations in a MATLAB/Simulink environment. By analyzing the results,  it showed that the PD-PWM technique produced better results than other modulation techniques, and that the voltage and current THD% obtained therefrom 2.49% and 1.86% at M = 1, which comes under IEEE-519 standard.

Cite this article as: N. K. Muthukuri, S. Mopidevi, “Analysis of a Modified Switching Pattern for Packed U Cell-15 Inverter Topology with Advanced Level Shift Carrier Pulse Width Modulation Techniques”, Electrica, vol. 21, no. 2, pp. 272-282, May, 2021.