Control system of APF device

Abstract

Control method of Active Parallel Filter (APF), which is based on the previously developed AFE control method utilizing the LQR controller, is described. The APF device is able to compensate fully reactive load current and reduce considerably higher harmonics up to 11th order. APF functionality was tested on a physical model of the LV 4-level converter with flying capacitors in steady and transient states for both symmetrical and asymmetrical loads. The control system was implemented into Emadyn-F controller