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

Minh Quan Duong, Francesco Grimaccia, Sonia Leva, Marco Mussetta and Kim Hung Le
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Minh Quan Duong: Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, 20156 Milano, Italy
Francesco Grimaccia: Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, 20156 Milano, Italy
Sonia Leva: Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, 20156 Milano, Italy
Marco Mussetta: Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, 20156 Milano, Italy
Kim Hung Le: 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

Energies, 2015, vol. 8, issue 7, 1-22

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.

Keywords: fuzzy logic; wind power; fault ride-through; squirrel-cage induction generator; transient stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (15)

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