This paper presents a fully-digital-controlled shunt

active filter for harmonic termination of a power distribution

system. The main purpose of the active filter based on voltage

detection is not to compensate for current harmonics but to damp

out harmonic propagation caused by line inductors and shunt

capacitors for power factor correction. However, time and phase

delays inherent in digital controllers might lead to unsatisfactory

harmonic-damping performance although digital controllers are

preferable to analog controllers. This paper deals with the design

and implementation of a digital controller for a shunt active filter

based on voltage detection. Experimental results obtained from a

laboratory system developed in this paper verify the viability and

effectiveness of the fully-digital-controlled active filter.