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Open AccessArticle

Direct Voltage Control of a Doubly Fed Induction Generator by Means of Optimal Strategy

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Federal Institute of Education, Science and Technology of Rio Grande do Norte, Campus Natal – Zona Norte, Natal 59112-490, Brazil
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Federal Institute of Education, Science and Technology of Rio Grande do Norte, Campus Santa Cruz, Santa Cruz 59200-000, Brazil
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Department of Electrical Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, Brazil
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Department of Computer Engineering and Automation, Federal University of Rio Grande do Norte, Natal 59078-970, Brazil
*
Author to whom correspondence should be addressed.
Energies 2020, 13(3), 770; https://doi.org/10.3390/en13030770
Received: 4 December 2019 / Revised: 28 January 2020 / Accepted: 5 February 2020 / Published: 10 February 2020
(This article belongs to the Special Issue Optimal Control and Nonlinear Dynamics in Electrical Power Systems)
The major objective of the investigation reported in this article is to demonstrate the feasibility of controlling a Doubly Fed Induction Generator actuating directly on the rotor voltage produced by the Rotor Side Converter, as its reference value may be determined analytically, after definition of the control objective. Two usual objectives are here considered: maximum power extraction from wind (MPPT) and stator reactive power equal to zero. This last objective defines the reference slip to be considered in the formulation of developed power that, jointly with the reactive power equation, forms the system to calculate the rotor reference voltages. The process is completed by specifying the desired dynamical response. Thus, the angular velocity of the rotor should quickly reach its reference value, which requires maximal power acceleration at the beginning, but respects the restriction that no overshoot should be allowed. This is achieved by means of a constrained optimization process solved in real time. Following recent trends, only measurements obtained from stator (voltages and currents) sensors are used. This way, angular velocity and rotor currents are estimated in real time. An algorithm for inductance estimation is also included, which prevents deviations of nominal values that could lead to false reference voltages. View Full-Text
Keywords: DFIG optimal control; direct control; minimal sensors set; MPPT; transient stability; WECS DFIG optimal control; direct control; minimal sensors set; MPPT; transient stability; WECS
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MDPI and ACS Style

Medeiros, A.; Ramos, T.; Oliveira, J.T.; Medeiros Júnior, M.F. Direct Voltage Control of a Doubly Fed Induction Generator by Means of Optimal Strategy. Energies 2020, 13, 770.

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