| The P WM rectifier has the advantages of small current harmonic distortion on the grid side,four-quadrant operation,and high power factor,therefore it is widely used.In recent years,many high-performance control strategies for PWM rectifiers have emerged,among which predictive control is favored by the advantages of intuitive concept and simple controller parameter setting.This paper is valuable for the research of the deadbeat power prediction control.In order to improve the response speed of the three-phase voltage-type PWM rectifier and the robustness of the AC side inductance parameters,a deadbeat power prediction control method is improved,and in order to save hardware cost,a virtual flux observer is introduced into software algorithm to remove grid side voltage hall,and an improved deadbeat power predictive control scheme without grid voltage sensor is formed.In this control scheme,repetitive controller is introduced to improve the existing deadbeat power predictive control,and the power feedback correction is added,and the power prediction reference value is corrected for each beat to improve the power tracking performance,eliminate the system steady state error and improve the robustness of the system.An orthogonal signal generator based on second-order generalized integrator is introduced to improve the performance of digital integration in virtual flux observer.Finally,the control scheme of this paper is compared with the improved deadbeat power predictive control with grid voltage sensor,the direct power control without grid voltage sensor,and the traditional deadbeat direct power control without grid voltage sensor.And Four control strategies are compared and tested on a 2kW experimental prototype.The simulation and experimental results show that the control scheme not only eliminates the steady-state static error of the inner loop power,but also improves the robustness of the system to the inductance parameters,and saves the cost. |
PDF Full Text Request