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Energies 2017, 10(5), 669; doi:10.3390/en10050669

Coordinated Control Strategy for a Hybrid Wind Farm with DFIG and PMSG under Symmetrical Grid Faults

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
2
Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 5 March 2017 / Revised: 29 April 2017 / Accepted: 8 May 2017 / Published: 11 May 2017
(This article belongs to the Special Issue Wind Turbine 2017)
View Full-Text   |   Download PDF [7320 KB, uploaded 11 May 2017]   |  

Abstract

This paper presents a coordinated control strategy for a hybrid wind farm with doubly-fed induction generator (DFIG)- and direct-driven permanent-magnet synchronous generator (PMSG)-based wind turbines under symmetrical grid faults. The proposed low-voltage ride-through (LVRT) strategy is based on a novel current allocation principle and is implemented for individual DFIG- or PMSG-based wind turbines. No communication equipment between different wind power generators is required. By monitoring the local voltages and active power outputs of the corresponding wind generators, the proposed control strategy can control the hybrid wind farm to provide the maximum reactive power to support the grid voltage during a symmetrical grid fault. As a result, the reduction in the active power output from the hybrid wind farm can be decreased, which also helps avoid generator over-speed issues and supply active power support for the power grid. In addition, the reactive current upper limits of DFIG- and PMSG-based sub-wind farms are investigated by considering different active power outputs and different grid voltage dip depths, and the feasible regions of the two types of sub-wind farms for meeting the LVRT requirements are further studied. Finally, the effectiveness of the proposed coordinated LVRT control strategy for the hybrid wind farm is validated by simulation and experimental results. View Full-Text
Keywords: wind power generation; hybrid wind farm; symmetrical grid faults; low voltage ride through (LVRT); reactive current limit; current allocation principle wind power generation; hybrid wind farm; symmetrical grid faults; low voltage ride through (LVRT); reactive current limit; current allocation principle
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MDPI and ACS Style

Li, J.; Yao, J.; Zeng, X.; Liu, R.; Xu, D.; Wang, C. Coordinated Control Strategy for a Hybrid Wind Farm with DFIG and PMSG under Symmetrical Grid Faults. Energies 2017, 10, 669.

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