Title

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.

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

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