A Recursive Park Transformation to Improve the Performance of Synchronous Reference Frame Controllers in Shunt Active Power Filters

摘要: Load harmonic currents and load unbalances reduce power quality (PQ) supplied by electrical networks. Shunt active filters (SAPFs) are a well-known solution that can be employed to enhance PQ injecting compensation current at the point of common coupling (PCC) SAPF, load, grid. Hence, SAPF controllers must determine instantaneous values reference current, including nondesirable components current. A family controllers, which evaluates using synchronous rotating frames (SRFs), employs structure based on Park transformations: direct transform, low- pass filtering (LPF), inverse transform. The cutoff frequency filter order LPF stage designed properly in obtain an accurate fast dynamic response these controllers. This paper proposes recursive implementation transformation avoids allows SRF designed. Moreover, proposed is not dependent PCC conditions. evaluated three-phase, three-wire compared with LPF-based simulation experiment.