Novel source current detection control of active power filter with selective harmonic compensation

In industrial application, the parallel active power filter (PAPF) is used most widely to eliminate the current distortion. It can be classified into two types according different current detection method. One is the load current detection type, and the other is the source current detection type. Load current detection method is an open-loop system, so both time delay and parameter deviation of the PAPF (especially in harmonic detector of PAPF) can cause incorrect compensation and unwanted remaining harmonics in the source current. Source current detection is a closed-loop system, while in traditional source current detection control method, system stability and performance of harmonic elimination is incompatible. In this paper a novel source current detection control of PAPF with selective harmonic compensation is proposed. Implementation of the proposed method in either synchronous or stationary frame is given in this paper. This method can ensure both the excellent performance of PAPF and the system stability. Moreover, this control method is insensitive to time delay and parameter deviation of the PAPF. Finally, simulation and experiment results are presented to demonstrate the conclusions.