Background: In this paper, we propose a redundancy configuration method for Modular
Multi-level Converters (MMCs), to improve system reliability and sub-module efficiency, and for
maximizing the redundant sub-module value rate.
Methods: We establish a set of objective functions using these aims, to obtain the optimal number of
redundant sub-modules. To aid in the evaluation of the configuration method, we analyzed the MMC
topology and the operational principle of the sub-modules. We present concrete steps for module
redundancy optimization based on the redundant protection scheme used with the MMC.
Result: The results of simulations modelling the operation of the configuration algorithm prove that the
number of redundant sub-modules can be effectively allocated using the proposed method while
ensuring the reliable operation of the system.