Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 32, Issue 4, Pages 2596-2607Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2570821
Keywords
Active power filters (APFs); fundamental extraction; harmonics detection
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Funding
- Hong Kong Research Council under the Theme-based Research Fund [T23-701/14-N]
- EPSRC [EP/L014343/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L014343/1] Funding Source: researchfish
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Harmonics detection is a critical element of active power filters. A previous review has shown that the recursive discrete Fourier transform and the instantaneous p-q theory are effective solutions to extracting power harmonics in single-phase and three-phase power systems, respectively. This paper presents the operating principle of a newmodulation function integral observer algorithm that offers a fast solution for the extraction of the fundamental current and the total harmonic current when compared with existing methods. The proposed method can be applied to both single-and three-phase systems. The observer-based algorithm has an advantageous feature of being able to be tuned offline for a specific application, having fast convergence, and producing estimated fundamental component with high circularity. It has been tested with both simulations and practical experiments for extracting the total harmonic current in a highly efficient manner. The results have confirmed that the proposed tool offers a new and highly effective alternative for the smart grid industry.
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