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Open Access

ORIGINAL RESEARCH

A selection principle of submodule switching state vectors for switching frequency reduction in voltage self‐balancing half‐bridge modular multilevel converters

Yiyuan Zhou, Liang Qin, Shiqi Yang, Qing Wang, Kaipei Liu

Version of Record online: 12 November 2023

In this work, the authors propose a selection principle of submodule switching state vectors based on the voltage self-balancing switching state matrix with lowered submodule switching frequency and device losses. The evaluation indexes of the voltage self-balancing control effect are determined, and the optimized construction method of switching state matrix is presented. The selection principle proposed can effectively reduce switching frequency while meeting the evaluation requirements of practical engineering projects, so as to achieve the balance between switching loss and steady-state capacitor voltage fluctuation.

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