1017-1025In this paper, a nonlinear observer-based controller
for a single-phase active front-end (AFE) rectifier is presented to improve
power factor with high quality output DC voltage.
Proposed algorithm is based on an Luenberger-like observer and a passivity-based
controller. Closed-loop stability is demonstrated for
all operating ranges using Lyapunov theory. Performance of observer based
controller is shown by
simulation for voltage sag occurrence and abrupt load changes