A new control scheme for a current-injection three-phase high power factor rectifier based on the linear decoupling principle

In this paper, a new control law, based on the linear decoupling strategy, is designed for a three-phase current injection rectifier. The proposed control scheme is based on the pulse-width-modulation technique and on the elaboration of a small-signal mathematical model that represents the converter in the frequency domain. The basic model of the converter is derive from the application of the state-space-averaging technique. The control feedback loops are designed on two levels. Firstly, an inner multivariable feedback subsystem is established in order to ensure line current shaping. The decoupling principle has been used in order to avoid the cross-dependency between the variables and to ensure, consequently, a high dynamic performance. Then, an outer loop is constructed for the regulation of the output voltage. Both current and voltage loops are elaborated using optimizing criteria discussed in the linear control theory. The performance characteristics of the new proposed control approach are highlighted through numerical simulations carried out using Matlab/Simulink. Moreover, the efficiency of the proposed control approach is emphasized through a comparative evaluation with respect to other control laws yet applied to the topology considered in the paper.