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Energies 2016, 9(11), 977; doi:10.3390/en9110977

An Improved Adaptive-Torque-Gain MPPT Control for Direct-Driven PMSG Wind Turbines Considering Wind Farm Turbulences

1
School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
2
Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, TN 37996, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 9 October 2016 / Revised: 9 November 2016 / Accepted: 15 November 2016 / Published: 22 November 2016
(This article belongs to the Special Issue Wind Turbine 2017)
View Full-Text   |   Download PDF [6042 KB, uploaded 22 November 2016]   |  

Abstract

Maximum power point tracking (MPPT) plays an important role in increasing the efficiency of a wind energy conversion system (WECS). In this paper, three conventional MPPT methods are reviewed: power signal feedback (PSF) control, decreased torque gain (DTG) control, and adaptive torque gain (ATG) control, and their potential challenges are investigated. It is found out that the conventional MPPT method ignores the effect of wind turbine inertia and wind speed fluctuations, which lowers WECS efficiency. Accordingly, an improved adaptive torque gain (IATG) method is proposed, which customizes adaptive torque gains and enhances MPPT performances. Specifically, the IATG control considers wind farm turbulences and works out the relationship between the optimal torque gains and the wind speed characteristics, which has not been reported in the literature. The IATG control is promising, especially under the ongoing trend of building wind farms with large-scale wind turbines and at low and medium wind speed sites. View Full-Text
Keywords: wind energy conversion system (WECS); wind turbine; maximum power point tracking (MPPT); adaptive torque gain control; turbulence intensity wind energy conversion system (WECS); wind turbine; maximum power point tracking (MPPT); adaptive torque gain control; turbulence intensity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, X.; Huang, C.; Hao, S.; Chen, F.; Zhai, J. An Improved Adaptive-Torque-Gain MPPT Control for Direct-Driven PMSG Wind Turbines Considering Wind Farm Turbulences. Energies 2016, 9, 977.

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