Analytical Expression for DC Link Capacitor Current in a Cascaded H-Bridge Multi-Level Active Front-End Converter
Abstract
Medium-voltage grid-tied systems often use a cascaded H-bridge multi-level active front-end. In this converter, dc link bus capacitors play an important role in stabilizing the converter and enabling both active and reactive power injections. The present work provides analytical expressions for the capacitor current, which are essential for optimizing system design (especially capacitor size vs. lifetime). Then, the expression is incorporated into the grid connected bidirectional power system model. Consequently, this work contributes to the guiding principles to choose accurate dc link capacitor ratings against grid-side power delivery requirements. The analytical results have been validated with detailed simulations and hardware results.
Recommended Citation
M. S. Malik and J. W. Kimball, "Analytical Expression for DC Link Capacitor Current in a Cascaded H-Bridge Multi-Level Active Front-End Converter," Proceedings of the 2021 IEEE Applied Power Electronics Conference and Exposition (2021, Phoenix, AZ), pp. 1659 - 1665, Institute of Electrical and Electronics Engineers (IEEE), Jun 2021.
The definitive version is available at https://doi.org/10.1109/APEC42165.2021.9487078
Meeting Name
2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021 (2021: Jun. 14-17, Phoenix, AZ)
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Carrier-Based PWM; Cascaded H-Bridge; Dc-Link Capacitor Lifetime; Var Compensation
International Standard Book Number (ISBN)
978-172818949-9
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
17 Jun 2021
