The comparative study of different methods about constructing switching table in DPC for three-level rectifier

According to the mathematical model of three-level rectifier based on direct power control (DPC) in dq rotating coordinates, the influence of all voltage vectors on active power and passive power were analyzed. All vectors switch tables and simplified switch table based on the fastest power rise were presented. The simulations about the presented switch tables and the conventional all vector switch table based on neighboring vector have been completed. The results show that the system stability based on the fastest power rise is better while loads could be changed rapidly. Simplified switch table based on the fastest power rise is the most simple. In all vectors switch table based on neighboring vector, the balance properties of neutral point voltage of rectifier in DC side is the best, the current in AC side and power are much smooth.