基于反向解耦的电压型PWM整流器内模控制

Internal Model Control of Voltage-sourced PWM Rectifier Based on Inverted Decoupling

针对三相电压型PWM整流器提出了一种新型双闭环控制方法。在同步旋转坐标系下建立了三相电压型PWM整流器的数学模型,考虑其耦合特性,采用反向解耦方法实现了标称系统的完全解耦,并对解耦后的广义被控对象设计了电流内环的内模PI (Internal model control PI, IMC-PI)控制器,在此基础上,基于电压外环的简化模型设计了IMC-PID控制器。仿真结果表明所提方法既保证了系统的完全解耦,又减少了控制器整定参数个数,可使系统同时具有更好的动态性能和鲁棒性。

For three-phase voltage-sourced PWM rectifier, a novel double closed loop control method is proposed in this paper, which is based on the mathematical model in synchronous rotating coordinate system. Considering the coupling characteristics, the inner-current loop adopted reverted decoupling internal model control(IMC) method and designed IMC-PI controller for the decoupled generalized controlled object, which could realize the complete decoupling of the nominal systems. On this basis, the IMC-PID controller was designed based on the simplified model of voltage loop. The simulation results show that the proposed method can ensure the complete decoupling of the system, reduce the controller′s tuning parameters, and provide better dynamic performance and robustness.