| Abstract |
The interest in the application of the active filters to the harmonic compensation increases with the rise of the pollution of the utility networks by distorting electronic loads. The high cost of these filters limited, up to now, their diffusion in the industrial applications. Acceptable results can be obtained by hybrid units, including passive filters networks associated with active units which integrate and control the passive filtering. The active section can be sized only at a fraction of the total compensating power rating. In the paper, the design criteria and the implementation of an industrial filter unit, intended to the compensation of medium-power distorting loads is described. The design criteria to obtain flexible and robust operation, good transient capability and insensitivity to the resonance conditions with the supply are outlined. The proportioning of the passive section is discussed. The filter control system, with some peculiar features, is detailed. The experimental performance, in comparison with the simulated behaviour, is reported. |
