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

Arthur Medeiros, Thales Ramos, José Tavares de Oliveira and Manoel F. Medeiros Júnior
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Arthur Medeiros: Federal Institute of Education, Science and Technology of Rio Grande do Norte, Campus Natal – Zona Norte, Natal 59112-490, Brazil
Thales Ramos: Federal Institute of Education, Science and Technology of Rio Grande do Norte, Campus Santa Cruz, Santa Cruz 59200-000, Brazil
José Tavares de Oliveira: Department of Electrical Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, Brazil
Manoel F. Medeiros Júnior: Department of Computer Engineering and Automation, Federal University of Rio Grande do Norte, Natal 59078-970, Brazil

Energies, 2020, vol. 13, issue 3, 1-28

Abstract: 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.

Keywords: DFIG optimal control; direct control; minimal sensors set; MPPT; transient stability; WECS (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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