Transformerless Hybrid Power Filter

Abstract

One of the most important issues related to current harmonics generated by the increasing number of non-linear loads connected to the power grid such as diode and thyristor front end rectifiers. As a consequence, these harmonics cause voltage distortions, additional losses in the power system and malfunction of sensitive electronic equipment. For this reason harmonic restriction standard, such as IEEE 519, have been recommended to limit the harmonic currents injected into the grid by nonlinear loads. Shunt passive filters consisting of tuned LC filters and high pass filters have been traditionally used as a simple and low cost solution to compensate current harmonics. Nevertheless, their performance strongly depends on grid impedance and can possibly cause the unwanted parallel resonance phenomena with the grid.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM