Digital Repetitive Control of a Three-Phase Four-Wire Shunt Active Filter
- 16 April 2007
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Industrial Electronics Magazine
- Vol. 54 (3), 1495-1503
- https://doi.org/10.1109/tie.2007.894790
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 systemKeywords
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