Title :
Odd-harmonic repetitive control of an active filter under varying network frequency: Practical considerations
Author :
Costa-Castelló, Ramon ; Olm, Josep M. ; Ramos, Germán A. ; Cardoner-Parpal, Rafel
Author_Institution :
Inst. of Ind. & Control Eng., Univ. Politec. de Catalunya, Barcelona, Spain
Abstract :
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 odd-harmonic repetitive control, and aims at obtaining good closed-loop 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 sampling time of the digital controller according to the network frequency variation. However, this implies structural changes in the closed-loop system that may eventually destabilize it. Hence, this article is also concerned with closed-loop stability of the resulting system, which is analyzed using a robust control approach that takes advantage of the small gain theorem. Experimental results reporting good performance of the closed-loop system are provided.
Keywords :
active filters; closed loop systems; compensation; control system synthesis; digital control; feedback; feedforward; power harmonic filters; power system control; robust control; closed-loop performance; closed-loop stability; closed-loop system; compensation; controller analysis; controller design; digital controller; electrical network; feedback action; feedforward action; gain theorem; network frequency variation; odd-harmonic repetitive control; robust control; shunt active power filter; structural change; Capacitors; Control systems; Converters; Feedforward neural networks; Frequency control; Gain; Stability analysis;
Conference_Titel :
Control Applications (CCA), 2010 IEEE International Conference on
Conference_Location :
Yokohama
Print_ISBN :
978-1-4244-5362-7
Electronic_ISBN :
978-1-4244-5363-4
DOI :
10.1109/CCA.2010.5611211