Advanced Control of Active Filters in a Battery
The thesis contains discussions on modelling aspects and design considerations for the proposed battery charger, based on a carrier wave modulated self commutated 2-level voltage source converter topology. Furthermore, model based controller synthesis is employed, and thorough analysis of the controller characteristics is given.
Emphasis is put on the active filtering performance of the battery charger. The weaknesses of the model based control system in active filter applications are revealed, where especially the inherent phase deviation of the control system and the sensitivity to system parameters deteriorates the performance of the active filter.
In order to overcome the deteriorating properties of the
model based controller, a controller structure for active filters based on several
integrators in multiple reference frames is proposed. It is shown, both theoretically and
experimentally, that the proposed controller exhibits low sensitivity to system parameters
and provides for complete compensation of the inherent phase deviation. The result is
excellent conditioning performance of the proposed active filter controller in steady
Last updated 1999-12-06