shunt active filter based on voltage detection for harmonic termination of a radial p
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16-03-2010, 06:48 AM


ABSTRACT

This paper focuses on a shunt active filter based on the detection of harmonic voltages at the point of installation. The objective of the active filter is to attenuate harmonic propagation resulting from series/parallel resonance between capacitors for power factor correction and line inductors in a power distribution line. The active filter acts as a low resistor to the external circuit for harmonic frequencies, and it is installed on the end bus of the power distribution line, just like a 50 O terminator installed on the end terminal of a signal transmission line. Therefore, the function of the active filter is referred to as harmonic termination in this paper. Experimental results obtained from a laboratory system rated at 200 V and 20 kW verify that the active filter for the purpose of harmonic termination has the capability of harmonic damping throughout the power distribution line

INTRODUCTION
NONLINEAR loads such as high-power diode/thyristor rectifiers, cycloconverters, and arc furnaces draw nonsinusoidal currents from utility grids. A single low-power diode rectifier used as a utility interface in an electric appliance produces a negligible amount of harmonic current. However, multiple low-power diode rectifiers can inject a large amount of current harmonics into power distribution systems. These harmonic-producing loads contribute to the degradation of power quality in transmission/distribution systems.

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