A shunt active filter based on voltage detection for harmonic termination of a radial power distribution line

TLDR

The study proposes a shunt active filter that detects harmonic voltages at the installation point to attenuate harmonic propagation caused by series/parallel resonance between capacitors and inductors in a power distribution line. The filter functions as a low‑resistance load for harmonic frequencies and is mounted on the end bus of the distribution line, analogous to a 50‑Ω terminator on a transmission line. Experiments on a 200‑V, 20‑kW laboratory system confirm that the filter effectively damps harmonics along the distribution line.

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 /spl Omega/ 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.