Simulation of Processes in the Modular Multilevel Inverter

One of the important aspects of improving energy efficiency at the moment is the widespread introduction of a adjustable-speed electric drives for motors with a medium rated voltage. One of the actual ways of development in this direction is to research the methods for controlling a modular multi-level inverter, since it has a number of valuable advantages for the implementation of such a system. The main advantage of this scheme can be the possibility of a modular implementation based on the same types of cells with identical parameters. The disadvantage is that the entire load current of the converter passes through the capacitors of its modules, causing a change in the voltage on them. The paper presents the results of modeling the operation of the circuit at high and low frequency of the output voltage. An analysis of the main dependencies describing the processes in a modular multilevel converter is presented.