Design and implementation of fully digital-controlled 400Hz active power filter for aircraft applications

The paper proposed the key design issues for fully-digital-controlled 400 Hz APF. Detailed design considerations, which include APF grid-connected inductance, line inductance and DC bus capacitance, were presented to meet specific goal. Simulation was given to verify correctness of the design analysis. A 20kVA prototype was setup to verify the validity of the APF design considerations. The experimental results show that the APF can compensate the harmonic order up to 13^th and reduces THD( Total Harmonic Distortion) from 28.9% to 5.7% at full load and it achieves good dynamic performance as well.