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Journal of Electrical and Computer Engineering
Volume 2017 (2017), Article ID 7239267, 8 pages
https://doi.org/10.1155/2017/7239267
Research Article

Random Harmonic Detection and Compensation Based on Synchronous Reference Frame

Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China

Correspondence should be addressed to Yanbo Che; nc.ude.ujt@ehcby

Received 16 January 2017; Revised 11 May 2017; Accepted 14 May 2017; Published 6 June 2017

Academic Editor: Ephraim Suhir

Copyright © 2017 Yanbo Che et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Algorithms for harmonic detection and compensation are important guarantees for an active power filter (APF) to achieve the harmonic control function and directly determine the overall performance. Existing algorithms usually need a large amount of computation, and the compensation effect of specified order harmonic is also limited. DC side capacitor voltage at sudden change of load is affected by the algorithm as well. This paper proposes a new algorithm for harmonic detection and compensation based on synchronous reference frame (SRF), in which a band-pass filter with center frequency of th harmonic is designed in fundamental frequency SRF to extract random harmonic current with two different frequencies of ()th harmonic in stationary reference frame. This new algorithm can rapidly detect any specified harmonic, and it can adjust the power factor to compensate reactive power. Meanwhile, it has few impacts on DC side capacitor voltage under complicated operating conditions such as sudden change of load. The correctness and effectiveness of this new algorithm are verified by simulation and experiment.