A New Method of Harmonic Current Detection and Control Strategy of Compensating Current

摘要

This paper puts forward and realizes a detection method, which can extract harmonic and reactive current accurately when the network exists nonideal and asymmetric power grid voltages. From the view of vector analysis, through the d-q coordinates[1, 2] project transformation of the three-phase voltage and current vectors, the harmonic and reactive current extraction is realized. The compensation current adopts forecast current control, obtaining a better compensation characteristic and control accuracy. From the experimental results of 5 kVA active power filter (APF) and 150 kVA mixing filters, the feasibility and the correctness of the proposed method are proved.