Control of series active power filter by state feedback

Abstract

The active power filters in series connection or series APF, are static compensation systems based on an electronic converter PWM (Pulse Width Modulation). The systematic use of series APFs in the power systems allows the elimination of the harmonics caused by specific loads named voltage source harmonic loads. To obtain this compensation objective, several strategies have been proposed up now. Nevertheless, each strategy development has been based on the equivalent electrical circuit and on the results obtained in simulation and/or experimental tests. Generally, the control structure formal analysis is not carried out. In this work, the whole system state model has been obtained. Besides, the system behavior has been analyzed from the state equations for each compensation strategy. As a consequence, the analysis has allowed the establishment of design rules respect to the resultant control strategy. Finally, a practical case is presented, whose results illustrate the proposed method.