文档介绍：INT. J. ELECTRONICS, 2001, VOL. 88, NO. 12, 1257±1269
Shunt active ®lter for reactive pensation
TAE-JUN PARK{, GANG-YOUL JEONG{ and
BONG-HWAN KWON*{
A simple control technique for three-phase shunt active ®lters putation
of the reactive ponent is presented. A current controller with fast
dynamics for an active ®lter is described. Reactive current is directly controlled
without the need for sensing puting the ponent of the load
current, thus simplifying the control system. pensation is done in the
time domain, allowing a fast time response. The dc voltage control loop keeps the
voltage across the dc capacitor constant. High power factor control by an active
®lter is described. All control functions are implemented in software using a single-
chip microcontroller, thus simplifying the control circuit. Any current-controlled
synchronous recti®er can be used as a shunt active ®lter through only the simple
modi®cation of the software and the addition of current sensors. It is shown
through experimental results that the proposed controller gives good
performance for the shunt active ®lter.
1. Introduction
The proliferation of nonlinear loads such as diode converters, thyristor conver-
ters and cycloconverters results in a variety of undesirable phenomena on power
systems. The most important among these are harmonic contamination, increased
reactive power demand, and power system voltage ¯uctuations. Current harmonics
and asymmetries are generally responsible for increase of losses in ac power lines,
transformers and rotating machines, cause oscillatory torque responsible for
mechanical stress, cause malfunctions in sensitive equipment, and can create
signi®cant interference munication circuits. Conventionally, passive LC
(inductor±capacitor) ®lters have been used to eliminate line current harmonics and
to increase the load power factor. However, the harmonic problem is not solved
adequately by passive LC ®lters since they are un