A Sort Method of Balancing Capacitor Voltage of MMC

The sub-module voltage sharing of modular multi-level converters is beneficial to reducing switching losses and eliminating DC side circulations, which has attracted the attention of experts and scholars at home and abroad. Based on the quick selection sorting algorithm, this paper studies the grouping sorting of Modular Multilevel Converter (MMC). Firstly, on the basis of quick selection sort, an improved selection sort is designed to optimize the time complexity. Secondly, simulation experiments are carried out on SIMULINK to demonstrate the feasibility of improving quick selection sort algorithm and the principle grouping double voltage limit.