An error current tracking control method of three-level active power filter

In order to track the error current of three-level active filter more effectively, this paper presents a hysteresis current control method based on voltage space vector. Based on the conventional method, the selection of the resultant vector is no longer confined to a small sector the reference voltage belongs to. It finds out the optimal switching state through optimization in a large sector, which makes the track of error current by resultant vector more effective. From the perspective of control strategy, three-level active power filter based on LCL-type output filter using this control method has better tracking performance. Finally, the simulation and experiment validate the effectiveness of the proposed method.