A comparative study of two current-control techniques applied to a three-phase three-level active power filter

The active power filter (APF) has already established itself as a prominent means of addressing harmonic pollution and other power quality issues. Current control of an APF is a key in achieving a good compensation performance. Generally, PI control is used owing to its simplicity and ease of implementation. However, using a proportional resonant (PR) controller can give an added advantage in tracking of harmonics at higher frequencies. This paper presents a comparative study of current control when implemented using PI and PR controllers in a platform of a three-phase three-level shunt APF. The simulation results prove the effectiveness of PR control over PI control.