Performance improvement of active power filters based on p-q and d-q control methods under non-ideal supply voltage conditions

In this paper, we investigate the effect of unbalanced and distorted supply voltages on the performance of active power filters that are based on the well-known p-q and d-q control methods. Our analysis shows that the harmonic suppression performance of the p-q and d-q control methods deteriorates when non-ideal sources are used. We propose the use of a self-tuning filter (STF) with the p-q theory or d-q method as a way of alleviating the detrimental effects of non-ideal supply voltages. Simulation results show that the proposed method can improve the performance of active power filters under non-ideal voltage conditions.