In this paper

a kind of new strategy for balancing the capacitor voltage（CV）for modular multilevel converter（MMC） is proposed.The balance of capacitive voltage is the main problem faced in the MMC applications and it is usually solved by adopting a global arm control approach.For using such method

a sorted list of the sub-module（SM） in accordance with their capacitor voltages is necessary.However

with the increase of sub model

the execution time and the computational efforts of these algorithms increase very rapidly.A novel idea is proposed in this paper by using a mapping strategy that directly stores in a ranked list the SM according to the measured CV.Avoidance use of sorting algorithms leads to a considerable reduction of the execution time as well as the computational efforts.