Single-stage switched-capacitor module (S3CM) topology for cascaded multilevel inverter

Lee, Sze Sing (2018) Single-stage switched-capacitor module (S3CM) topology for cascaded multilevel inverter. IEEE Transactions on Power Electronics, 1-4. (doi:10.1109/TPEL.2018.2805685).

Record type: Article

Abstract

A two-stage switched-capacitor based multilevel inverter possesses a drawback such that switches in the second stage (i.e. H-bridge) endure higher voltage stress. To resolve this problem, this letter proposes a single-stage switched-capacitor module (S3CM) topology for cascaded multilevel inverter which ensures the peak inverse voltage across all switches within the dc source voltage. Nine voltage levels can be generated with only one dc source and two incorporated capacitors. Hence, the number of isolated dc sources are significantly reduced compared to cascaded H-bridge. In addition, voltage boosting gain of two is achieved. A comparative analysis against the recent topology reveals that the proposed S3CM topology achieves switch count reduction. The operation of the proposed topology is validated through circuit analysis followed by experimental results of a single module (9-level) prototype.

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08290976 - Accepted Manuscript

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Accepted/In Press date: 12 February 2018

e-pub ahead of print date: 13 February 2018

Keywords: Boosting, Capacitors, Cascaded multilevel inverter, Inverters, Prototypes, single-stage, Stress, switchedcapacitor module, Switches, Topology