Abstract
A passive filter is often necessary in grid connected and standalone distributed generation systems to reduce harmonics on the inverter output voltage/current waveforms. This article presents a survey of passive filter structures used along with voltage source inverters in grid connected and standalone systems. The paper brings in the salient features of existing passive filters throwing their merits and demerits. In literature, intensive work has been performed on the identification of new passive filter topologies with features including reduced elements, lower losses, and reduced harmonics. New filtering techniques based on the traditional schemes have also been proposed for easy control, less complexity, and reduced harmonic distortion. In this paper, a review of such newly developed filter topologies is carried out. This work would constitute a base for selection of a particular filter structure, which serves an essential component in standalone and grid connected applications.
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