Paper Info
Title
Variable-Angle Phase-Shifted Pwm For Multilevel Three-Cell Cascaded H-Bridge Converters
Abstract
Multilevel cascaded H-bridge converters have become a mature technology for applications where high-power medium ac voltages are required. Normal operation of multilevel cascaded H-bridge converters assumes that all power cells have the same dc voltage, and each power cell generates the same voltage averaged over a sampling period using a conventional phase-shifted pulse width modulation (PWM) technique. However, this modulation method does not achieve good results under unbalanced operation per H-bridge in the power converter, which may happen in grid-connected applications such as photovoltaic or battery energy storage systems. In the paper, a simplified mathematical analysis of the phase-shifted PWM technique is presented. In addition, a modification of this conventional modulation method using variable shift angles between the power cells is introduced. This modification leads to the elimination of harmonic distortion of low-order harmonics due to the switching (triangular carrier frequency and its multiples) even under unbalanced operational conditions. The analysis is particularized for a three-cell cascaded H-bridge converter, and experimental results are presented to demonstrate the good performance of the proposed modulation method.
Year
DOI
Venue
2017
10.1109/TIE.2017.2652406
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Keywords
Field
DocType
Power conversion harmonics, pulse width modulation
Total harmonic distortion,Control theory,Delta modulation,Pulse-width modulation,Pulse-frequency modulation,Control engineering,Delta-sigma modulation,Electronic engineering,H bridge,Harmonics,Engineering,Pulse-amplitude modulation
Journal
Volume
Issue
ISSN
64
5
0278-0046
Citations 
PageRank 
References 
1
0.37
11
Authors
7
Name
Order
Citations
PageRank
Marquez, A.151.23
Jose I. Leon243044.77
Sergio Vazquez310.37
Ramon Portillo418237.50
Leopoldo G. Franquelo555256.44
Emilio Freire610.37
S. Kouro7366.32