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This work deals with the design and analysis of a controller for a shunt active power filter. The design is based on combined feedforward and feedback actions, the last using repetitive control, and aims at the obtention of a good closedloop performance in spite of the possible frequency variations that may occur in the electrical network. As these changes affect the performance of the controller, the proposal includes a compensation technique consisting of an adaptive change of the digital controller’s sampling time according to the network frequency variation. However, this implies structural changes in the closed-loop system that may destabilize the overall system. Hence, this article is also concerned with closed-loop stability of the resulting system, which is analyzed using a robust control approach through the small gain theorem. Experimental results that indicate good performance of the closed-loop system are provided.
Best Presentation in Session Award, que atorga la 2010 American Control Conference
CitationJ.M. Olm [et al.]. Odd-harmonic repetitive control of an active filter under varying network frequency: a small-gain theorem-based stability analysis. A: American Control Conference. "2010 American Control Conference". Baltimore: 2010, p. 1749-1754.
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