Banca de DEFESA: FILIPE EMANUEL VIEIRA TAVEIROS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : FILIPE EMANUEL VIEIRA TAVEIROS
DATA : 24/08/2018
HORA: 13:00
LOCAL: sala 4, ECT
TÍTULO:

A NOVEL CONTROL STRUCTURE TO ENHANCE THE DFIG-BASED WIND ENERGY CONVERSION SYSTEM INTEGRATION TO THE GRID

PALAVRAS-CHAVES:

doubly-fed induction generator, maximum power point tracking, low-voltage ride through, state-feedback

PÁGINAS: 112
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Sistemas Elétricos de Potência
ESPECIALIDADE: Medição, Controle, Correção e Proteção de Sistemas Elétricos de Potência
RESUMO:

The doubly fed induction generator (DFIG)-based wind energy conversion system (WECS) currently leads the wind energy market due to its advantages in comparison to other topologies. In this system, the generator stator is directly connected to the grid, while the rotor is connected to the grid by means of a back-to-back power converter scheme. The appropriate control of the converters allows the wind turbines based on the DFIG to operate in variable speed mode, whose benefits include maximum extraction of the power available in the wind, reactive power injection and mechanical stress reduction. Meanwhile, the increasing number of wind energy conversion systems has led the grid operators to develop specific regulations regarding the connection of these systems to the grid. Under these regulations, the fault ride-through and low voltage tolerance are amongst the most important and relevant aspects, as well as to provide reactive power to the grid in order to restore the voltage level during a fault. Therefore, such systems must maintain a high level of controllability during grid disturbances. This thesis investigates the impact of control and drive strategies on the performance of the DFIG-based wind energy conversion system, under the perspectives of maximum power extraction and fault ride-through, according to the grid regulations of Brazil, Canada, the United States and Germany. It is proposed a new heightened state-feedback control structure with predictive behavior and real time estimation of the parameters to be applied to the generator control, which considers in an integrated manner the dynamics of the machine currents in conjunction with the general modelling of the electromagnetic disturbance present during symmetric and asymmetric voltage sags, as well as the tracking errors. The proposed structure was designed to effectively suppress the oscillation dynamics present in the back electromotive force that occurs in the case of a grid voltage disturbance in order to mitigate oscillations and surges in the electromagnetic torque and the machine currents, exempting the need to use current reference modification strategies or the activation of physical protection, thus allowing the DFIG to provide reactive power during symmetrical and asymmetrical disturbances in the grid featuring limited torque oscillations. Results obtained by means of real-time digital simulations and experimental tests under ideal and non-ideal conditions demonstrate the superiority of the proposed structure in comparison to conventional and previous techniques.

MEMBROS DA BANCA:
Presidente - 1807863 - FLAVIO BEZERRA COSTA
Interno - 350693 - ANDRÉ LAURINDO MAITELLI
Externo ao Programa - 1569480 - JOSSANA MARIA DE SOUZA FERREIRA
Externo ao Programa - 1597497 - LUCIANO SALES BARROS
Externo à Instituição - FRANCISCO KLEBER DE ARAÚJO LIMA - UFC
Externo à Instituição - JOHAN DRIESEN - K.U. LEUVEN