Research on the Current Detection Algorithm for Reactive and Harmonic of Active Power Filters

Reactive and harmonic current detection is the key problem in technology of reactive power compensation and dynamic filtering. In this paper we studied on several typical reactive and harmonic current detection methods based on instantaneous reactive power theory in the three-phase three-wire power system, and we also analyzed the detection results of d-q detection algorithm under different voltage conditions from theory, At last, we set up the simulation system to verify the effectiveness of those methods. The results show that, d-q detection algorithm is applicable to the various conditions of voltage.