Control of three-phase rectifiers based on voltage equation of the PWM converter

The aim of this paper is to present an approach that improves the proposal based on the complete dynamical model by Ko¿mu¿rcu¿gil and Ku¿krer. This control scheme works in the stationary frame and does not need to measure the input line currents, but it is sensitive to variations in the value of the line inductances. This paper proposes a method based on a Fuzzy Logic Controller (FLC) that uses the reactive line current to adjust the L-control parameter into the Ko¿mu¿rcu¿gil´s control and do it more robust in view of variations in the line inductances. The method needs to know the line currents; therefore an algorithm to reconstruct them using only the information from the dc-link current has been employed.