Three-level three-dimensional SVM with a simplified algorithm of three-level four-leg diode-clamped inverter

In this paper a new algorithm of three-level three dimensional space vector modulation (3DSVM) is presented for three-level four-leg diode-clamped inverter. The proposed algorithm can reduce remarkably the complexity of 3DSVM by using two sectors only (sector one and sector two) in the conception of all modulation algorithm steps such as: determination of the space vector location, duration time calculation, and pulses generation. The voltage-balancing control of two split DC capacitors of the three-level four-leg converter is achieved using three-level 3DSVM with balancing strategy. This later based on the effective use of the redundant switching states of the inverter voltage vectors. Complete simulation of the results validates the efficiency of the proposed 3DSVM algorithm. The good performance of the proposed modulation technique is demonstrated from simulation for a three-level four-leg diode-clamped inverter.