Switched control of three-phase voltage source PWM rectifier under dynamic load by output feedback

Three-phase voltage source pulsewidth-modulated (PWM) rectifiers (VSRs) have received great attentions in industrial applications. Recently, some attempt has been made to study the flexible dc-bus voltage regulation problem under dynamic load of three-phase VSRs by switched control. Several PI controllers are designed for different load resistance range while only one PI controller is implemented for a given time instant by regarding the load resistance as the switching law. However, the existing approach is based on state feedback control, which requires the measurement of source current and dc-bus voltage. In this paper, we will adopt an output feedback control scheme, i.e., only dc-bus voltage should be measured. Compared with existing result, our design requires less information and reduces the cost. Simulation result demonstrates the effectiveness of our design.