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Energies 2015, 8(7), 6328-6349; doi:10.3390/en8076328

Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller

1
Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, 20156 Milano, Italy
2
Department of Electrical Engineering, University of Science and Technology—The University of Da Nang, Block A, 54 Nguyen Luong Bang Street, LienChieu District, DaNang City 59000, Vietnam
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 28 April 2015 / Revised: 4 June 2015 / Accepted: 12 June 2015 / Published: 25 June 2015
(This article belongs to the Collection Wind Turbines)
View Full-Text   |   Download PDF [892 KB, uploaded 25 June 2015]   |  

Abstract

A common problem in wind power plants involves fixed-speed wind turbines. In fact, being equipped with a squirrel-cage induction generator (SCIG), they tend to drain a relevant amount of reactive power from the grid, potentially causing voltage drops and possible voltage instability. To improve SCIG power quality and transient stability, this paper investigates a new control strategy for pitch angle control based on proportional-integral (PI) controller and a fuzzy logic controller (FLC), considering both normal and fault ride-through (FRT) schemes. In the literature, often, the mechanical torque output is assumed constant for a specific wind speed. This might not be accurate, because the mechanical torque-speed typical of a wind turbine depends also on the power coefficient or pitch angle. In this paper, an analytic model of transient stability is proposed using the equivalent circuit of the SCIG and using the concepts of stable and unstable electrical-mechanical equilibrium. The method has been evaluated by comparing the results obtained by the analytic method with the dynamic simulation. The results show that the proposed hybrid controller is effective at smoothing the output power and complying with FRT requirements for SCIG in the power system. View Full-Text
Keywords: fuzzy logic; wind power; fault ride-through; squirrel-cage induction generator; transient stability fuzzy logic; wind power; fault ride-through; squirrel-cage induction generator; transient stability
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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MDPI and ACS Style

Duong, M.Q.; Grimaccia, F.; Leva, S.; Mussetta, M.; Le, K.H. Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller. Energies 2015, 8, 6328-6349.

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