A control method for active power filters under unbalanced nonsinusoidal conditions

This paper presents a new control method for shunt active filters. Its aim is to compensate current harmonics caused by nonlinear loads. The active power filter ideal performance with the control method proposed is analysed under unbalanced and nonsinusoidal mains voltages. The active power filter ideal performance with the control method proposed is compared with the p-q control method introduced by Akagi. Under balanced sinusoidal main voltages the two control methods lead to the same results. However under unbalanced or nonsinusoidal mains voltages the new control method proposed leads to better results.