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

Abstract

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.