New Strategies for Application of Adaptive Filters in Active Power Filters

• Published in: IEEE transactions on industry applications Vol. 47; no. 3; pp. 1136 - 1141
• Main Authors: Pereira, R R, da Silva, C H, da Silva, L E B, Lambert-Torres, G, Pinto, J O P
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2011; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active filters; Active power filter (APF); Adaptive filters; adaptive notch filter; Algorithms; Digital signal processing; Filtering algorithms; Harmonic analysis; harmonic compensation; least mean square (LMS); Least mean squares algorithm; Matlab; Notch filters; Power filters; Power harmonic filters; recursive least squares (RLS); Strategy; Synchronism
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2011.2125931

This paper describes new strategies to improve the transient response time of harmonic detection using adaptive filters applied to shunt active power filters. Two cases are presented and discussed, both using an adaptive notch filter, but one uses the least mean square algorithm to adjust the coefficients and the other uses the recursive least squares algorithm. The synchronization of the adaptive notch filter orthogonal input signals, which are generated by the Clarke transformation of the load currents, is achieved automatically without the need of a phase-locked loop. This procedure significantly reduces the real-time computation burden. Simulations using Matlab/Simulink are presented to clarify the algorithm, and practical implementation is performed using the DSP Texas Instruments TMS320F2812. The experimental results are presented and discussed.