Title: A novel detection method and compensation strategy based on PQR transformation for PCC voltage of wind power system

Authors: Xiaoying Zhang; Xiaolan Wang; Zhiwei Wen; Zhizhuang Cheng

Addresses: School of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou, 730050, China ' School of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou, 730050, China ' Gansu Electric Power Research Institute, Lanzhou 730050, China ' School of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

Abstract: In order to keep low-voltage ride-through under the grid faults for wind power generation system, this paper proposes a novel three-phase magnitude-phase detection method and voltage sags compensation strategy for the point of common coupling based on PQR transformation. The proposed detection method can decouple the fundamental positive-sequence component and negative-sequence component of three-phase voltages, and detect the magnitudes and phases of them respectively. The novel compensation strategy includes the advantages of pre-sag compensation strategy and in-phase compensation strategy. The simulation results verify that the proposed detection method can overcome the shortcomings of conventional three-phase SPLL, track the magnitude and phase information of the fundamental positive-sequence voltage accurately and improve the speed of dynamic response effectively under the bad harmonic condition. The simulation test for single-phase voltage sag compensation verifies that the proposed strategy can mitigate the phase jump accompanied voltage sags and decrease the amplitude of injecting UDVR voltage.

Keywords: wind power generation; point of common coupling; PCC voltage; magnitude-phase detection; PQR transformation; voltage sag; compensation strategy; wind energy; simulation.

DOI: 10.1504/IJMIC.2013.055433

International Journal of Modelling, Identification and Control, 2013 Vol.19 No.3, pp.275 - 289

Published online: 27 Sep 2014 *

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