Input-output linearization of a single-phase active multilevel rectifier in d-q synchronous reference frame

A control scheme constituted by a nonlinear state feedback current controller and a PI voltage controller for a single-phase active multilevel rectifier is designed. The control is based on the system modeled in the d-q synchronous reference frame. Through input-output linearization theory a current controller that decouples the d-q components is obtained. Stability of zero dynamics is verified. Due to that the internal dynamics contains variables of interest; an external control loop by means of a PI controller connected in cascade with the current loop in the d-axis is designed to regulate its behavior. This control scheme achieves fast regulation of the DC bus voltage without steady state errors, high power factor, low harmonic content and robustness in face of parametric variations. The presented control scheme is verified by simulations on a switched model.