In order to reduce steady state errors of active and reactive powers in PWM converter and harmonic content of the AC side output currents, the power changing models of dead-beat predictive direct power control system of PWM converter were put forward. The voltage vector sequence method based on angular location of the converter AC side voltage was proposed. As angular deviation of the proposed method and the traditional ones in division sector, the same tendency of active or reactive powers change rate via selected three voltage vectors in even sectors was avoided and the phenomena of unreasonable duration time of auxiliary vector was removed. The proposed dead-beat predictive direct power control method has many advantages of rapid power adjustment, decreasing steady state errors of powers, reducing harmonic content of currents, fixing switching frequency, no coordinate transformation and space vector modulation, et al.
