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JPE, Vol. 19, No. 4, July 2019
Fast Extraction of Symmetrical Components from Distorted Three-Phase Signals Based on Asynchronous-Rotational Reference Frame
Tianqu Hao, Feng Gao, and Tao Xu
Area Power Quality and Utility Application
Abstract A symmetrical component decomposition scheme utilizing the characteristics of the asynchronous rotational reference frame transformation is proposed in this paper for the extraction of the positive and negative sequence components of distorted three-phase grid voltages. The undesired frequency component can be removed using a specially designed series coordinate transformation and half-cycle delays, where the delay can be controlled by adjusting the frequency of the rotating reference frame. The extracted symmetrical component can then be compensated based on the applied coordinated transformation. The dynamic response of the proposed algorithm is improved when compared to that of conventional methods. The effectiveness of the proposed algorithm is verified by simulation and experimental results.
Keyword Asynchronous rotational reference frame,Harmonics,Phase sequence,Symmetrical component
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