Application of the Generalized Integrator in Parallel Hybrid Active Power Filter

Based on the advantages of the passive filter and the active power filter, LC passive filter and active filter are combined to form a kind of parallel hybrid active power filter. But the harmonic circulation will produce between the active filter channel and the passive filter channel, which may cause active filter compensation part of the harmonic component into the passive filter and lead to the increase of total compensation capacity. This paper puts forward a new method for parallel hybrid active filter control in the above mentioned condition, and the new control method can effectively depart the passive filter compensation harmonic component, active filter compensation component and fundamental component. So it can give a clear division between the active filter and the passive filter, avoid harmonic circulation, and reduce active filter compensation capacity.