Abstract
There have been multiple attempts to improve the submodule (SM) structure, the fundamental block in Modular Multilevel Converter (MMC). The focus has been mainly on submodule voltage ripple reduction, system efficiency improvement, and short circuit blocking capabilities. This paper is one such attempt and proposes a new submodule structure to achieve some of the above-mentioned features. The proposed submodule structure is a three-level topology with two capacitors and five switches. There is a provision in the proposed submodule to connect these two capacitors in parallel during the intermediate voltage level, which can be advantageous in reducing the submodule voltage ripple. The proposed submodule can be seen as a replacement for two Half-Bridge submodules. The lesser number of devices and the parallel paths during an intermediate voltage level reduce the total device losses. The simulation validation of the proposed submodule structure is presented along with a detailed comparison with the existing submodule topologies.
Published Version
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