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Experimental Validation of a quasi Z-Source Modular Multilevel Converter with DC Fault Blocking Capability

Khera, Fatma; Klumpner, Christian; Wheeler, Pat

Authors

Fatma Khera



Abstract

This paper considers the design methodology and the modulation of the quasi Z-source modular multilevel converter (qZS-MMC) with half bridge sub-modules and evaluates its performance in voltage boosting mode for medium voltage applications. The qZS-MMC consists of two quasi Z-source networks inserted between the two terminals of the DC input source and the DC-link terminals of a modular multilevel converter (MMC), which allows the generation of an output voltage larger than the input DC voltage. Two modulation schemes have been analysed based on a mathematical derivation for the converter internal voltages, currents, and stored energy. The quasi Z-source circuit is proven to provide the qZS-MMC with half bridge sub-modules to deal with DC-faults. The experimental results validate the performance of the proposed modulation schemes and the DC-fault blocking capability of the qZS MMC. Finally, the losses of the qZS-MMC is compared against a standard MMC using full bridge sub-modules that can also provide DC fault capability. The range in which the qZS-MMC is more efficient has been identified. Furthermore, the qZS-MMC can provide a significant reduction in number of semiconductor power devices with the same performance.

Journal Article Type Article
Publication Date 2019
Journal IEEE Journal of Emerging and Selected Topics in Power Electronics
Electronic ISSN 2168-6785
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Pages 1-1
APA6 Citation Khera, F., Klumpner, C., & Wheeler, P. (2019). Experimental Validation of a quasi Z-Source Modular Multilevel Converter with DC Fault Blocking Capability. IEEE Journal of Emerging and Selected Topics in Power Electronics, 1-1. https://doi.org/10.1109/jestpe.2019.2955859
DOI https://doi.org/10.1109/jestpe.2019.2955859
Keywords Index Terms-DC faults; half bridge sub-modules; modular multilevel converter; modulation schemes; quasi Z-source
Publisher URL https://ieeexplore.ieee.org/search/searchresult.jsp?newsearch=true&queryText=Experimental%20Validation%20of%20a%20quasi%20Z-Source%20Modular%20Multilevel%20Converter%20with%20DC%20Fault%20Blocking%20Capability
Additional Information © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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