A Fast-Convergent Modulation Integral Observer for Online Detection of the Fundamental and Harmonics in Grid-Connected Power Electronics Systems

Boli Chen, Gilberto Pin, Wai Man Ng, Thomas Parisini, Shu-Yuen Ron Hui
2017 IEEE transactions on power electronics  
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 new modulation function integral observer algorithm that offers a fast solution for the extraction of the fundamental current and the total harmonic current when
more » ... compared with existing methods. The proposed method can be applied to both single-and three-phase systems. The observerbased 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 measurements 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 to the smart grid industry.
doi:10.1109/tpel.2016.2570821 fatcat:j5bh34xeiralfdajv7vw5wvogq