Analytical Expression for DC Link Capacitor Current in a Cascaded H-Bridge Multi-Level Active Front-End Converter
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.
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
2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021 (2021: Jun. 14-17, Phoenix, AZ)
Electrical and Computer Engineering
Keywords and Phrases
Carrier-Based PWM; Cascaded H-Bridge; Dc-Link Capacitor Lifetime; Var Compensation
International Standard Book Number (ISBN)
Article - Conference proceedings
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17 Jun 2021