三相电压型PWM整流的新型双闭环控制策略

同步旋转d-q坐标系下的电压、电流双闭环控制,广泛应用于三相电压型PWM整流器。该方案结构简单,比较适合基于数字处理芯片的数字控制系统。由于交流侧电感工艺存在差异,且当电流很大电感饱和时,电感值也会有变化,实际控制系统往往忽略掉耦合项;而电压外环的非线性也使得控制系统的性能提升受到限制。提出一种新的电压电流双闭环控制策略,其中电流内环借鉴合成矢量的思想,提出同步旋转d-q坐标系下无电感L参数的电流解耦控制方法;电压外环采用电压平方为控制量实现线性化的间接电压控制。仿真与实验结果均验证了所提方法的正确性和有效性。

A Novel Double Closed Loops Control of the Three-phase Voltage-sourced PWM Rectifier

The double closed loop control strategy,which is composed of inner current loop and outer voltage loop in the d-q synchronous frame,is a relatively common control strategy of the three-phase voltage-sourced PWM rectifier.This strategy is suitable for the digital control system with the digital signal processor(DSP),because of its simple structure.The decoupling part is often ignored without the exact value of the boost inductance.And the nonlinear outer voltage loop is also the limit to improve the control performance.This paper proposed a novel double closed loop control strategy,which consists of decoupling current controller without exact value of the boost inductance in d-q synchronous frame,and the outer voltage linear control strategy with the control amount of the square of the voltage.Both the simulation analysis and experimental results demonstrate the validity of the proposed method and the feasibility of the control strategy.