NPC three-level converter direct power control method based on vector influence tables

The invention belongs to the field of power converter control, and relates to an NPC three-level converter direct power control method based on vector influence tables. The method includes the following steps that the vector influence table for visually displaying the influence relation of space voltage vectors on active power and reactive power is built; the vector influence table for visually displaying the influence relation of the space voltage vectors on midpoint electric potential offset is built; according to the built vector influence tables, an optimal switch combination is screened and used for controlling the three-level voltage type converter. According to the NPC three-level converter direct power control method, fluctuation of voltage midpoint electric potential on a direct current side can be effectively eliminated while the power can be rapidly and accurately traced.