Simplified Space Vector Modulation Algorithm for Modular Multilevel Converters

A simplified space vector modulation (SVM) is proposed in order to realize that the SVM algorithm can be applied in modular multilevel converters (MMC) with more than five levels. First, the α and β axes of the tradition coordinates αβ are stretched so that the space vectors lie on integer grids. Second, the adjacent space vectors are used to construct a square with offside length 2. Next, the region in the square where the reference vector is located is quickly located. Then, a reference vector is synthesized using three space vectors of the region based on the principle of volt-second equilibrium. Finally, a three-phase MMC system simulation model is built using Matlab/Simulink, and the effectiveness of the algorithm is verified through simulation comparison.