A neutral point balancing problem in a three Level inverter analyzed using a redundant Algorithm

Over the past few decades, the fast development of high switching frequency power electronics drives towards wider application of voltage source inverters in AL power generation. Thus, a modulation technique with less total harmonic distortion, fewer switching losses, and wider linear modulation range, was needed. An analyze of the potential variation of middle point for three level inverter and based on redundant small vectors compensation, we have proposed the action time correction methods for the basic voltage vectors and the original fundamental voltage vector This study, afford a contribution to the problem of neutral-point voltage balancing in three-level NPC converter. That showed the three-level neutral point potential fluctuations can be suppressed effectively by the middle point potential compensation algorithm. MATLAB was used to build a simulation model for analysis.