Direct Power Control System of Voltage-Type PWM Rectifiers

According to the mathematical models of voltage-type PWM rectifiers under the synchronous rotating coordinate system, the power mathematical models are established based on voltage orientation. By analyzing the characteristics of the direct power control system, the double-closed loop structure with power voltage-square outer loop and power internal loop is derived in the paper. To solve the accuracy of coordinate change, the design of a single-phase voltage signal phase-locked loop is designed to obtain the accurate voltage phase. The theory is validated by MATLAB simulation experiment. The results show that the designed control system has good dynamic and static performance and can satisfy the requirements of voltage-type rectifiers.