Active power filters for line conditioning: a critical evaluation

This paper presents a critical analysis of various topologies for power circuits used in power line conditioners designed to attenuate or remove disturbances in the electric power system. By defining a series of merit figures, it becomes possible to appraise the desirable qualities shown by the technical and economical aspects in each configuration. There is also a description of the basic lines for designing practical equipment. Finally, experimental results of a novel topology which reconfigures to UPS operation in the case of a power line failure are shown to confirm the validity of the prospective method.