基于嵌入式重复控制的三相PWM整流器控制研究

Embedded Repetitive Controlled Three-Phase PWM Rectifier

建立三相脉冲宽度调制(pluse width modulation,PWM)整流器三相对称矢量在αβ两相静止坐标系下的数学模型,实现交流侧三相电流的完全解耦控制。将重复控制嵌入三相PWM整流器的电流控制内环的无差拍电流预测控制器中,实现对给定频率网侧电流的稳态无静差跟踪控制,并有效抑制电压谐波对电流环跟踪性能的影响。相较于无差拍电流预测控制器,嵌入式重复控制器在保持系统快速动态性能的同时,提高了控制系统的稳态性能和谐波抑制能力。在Matlab/Simulink上对此系统搭建仿真模型并分析,验证了该控制方法的可行性。

In order to achieve complete decoupling control of three-phase alternating current,establishing the mathematical model of three phase vector in αβ two-phase static coordinate system based on three-phase PWM rectifier. The repetitive controller is embedded in the deadbeat current control loop of a three-phase PWM rectifier,which can realize the steady-state non-static error tracking control of a specified frequency current,and effectively suppress the influence of harmonic voltage on current loop tracking performance. Compared to the deadbeat current controller,the embedded repetitive controller improved the steady-state performance and anti-interference ability of control system and held fast dynamic performance of the system at the same time. The feasibility of embedded repetitive controller was verified by Matlab/Simulink simulation results.