Digital Repetitive Control of a Three-Phase Four-Wire Shunt Active Filter
Grino, R.
Cardoner, R.
Costa-Castello, R.
Fossas, E.
Univ. Politecnica de Catalunya, Barcelona;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2007
Volume: 54,
Issue: 3
On page(s): 1495-1503
ISSN: 0278-0046
INSPEC Accession Number: 9477522
Digital Object Identifier: 10.1109/TIE.2007.894790
Current Version Published: 2007-04-16
Abstract
Shunt active power filters have been proved as useful elements to correct distorted currents caused by nonlinear loads in power distribution systems. This paper presents an all-digital approach based on a particular repetitive control technique for their control. Specifically, a digital repetitive plug-in controller for odd-harmonic discrete-time periodic references and disturbances is used for the current control loops of the active filter. This approach does not introduce a high gain at those frequencies for which it is not needed and, thus, improves robustness of the controlled system. The active power balance of the whole system is assured by an outer control loop, which is designed from an energy-balancing perspective. The design is performed for a three-phase four-wire shunt active filter with a full-bridge boost topology. Several experimental results are also presented to show the good behavior of the closed-loop system
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