Analytical Evaluation of Stabilizing PR Controller Gains for Single Phase Front End Converter

This paper evaluates the stabilizing PR controller gains and their selection for Single Phase Front End Converter (FEC). Since the Single Phase FEC is usually operated at a low switching frequency for high power applications, owing to its inability to handle the switching and conduction losses; the PR controller design becomes crucial for incorporating the delays and associated stability issues. This paper thoroughly derives the PR controller gains by employing the Stability Region (SR) method for the Inner Current Loop of Single Phase FEC. The SR method plots the boundary locus of the PR controller gains, indicating the region of stable operation of the converter. The deduced stabilizing controller gains are then thoroughly examined for desired stability margins and system parameter sensitivity. Scrutinizing various performance indexes, a stabilizing PR controller set is eventually selected to be employed in single-phase FEC. The presented analysis is validated through MATLAB simulation results.