Banca de QUALIFICAÇÃO: MÔNICA MARIA LEAL

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MÔNICA MARIA LEAL
DATA : 13/12/2018
HORA: 09:00
LOCAL: Sala 4, ECT
TÍTULO:

Wavelet-based directional protection

PALAVRAS-CHAVES:

Directional protection, fault classifier, wavelet transform

PÁGINAS: 100
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Sistemas Elétricos de Potência
ESPECIALIDADE: Medição, Controle, Correção e Proteção de Sistemas Elétricos de Potência
RESUMO:

Fast and accurate faults classifier and protect ios are required to ensure the safety of the power system. In this 

research, a directional protection with phase, positive sequence, negative sequence, and zero sequence units by 

using the scaling coefficients of the real-time stationary wavelet transform (RT-SWT) is presented. The wavelet 

coefficients are used as directional protection activators for fast detection of the fault inception time, whereas the 

scaling coefficients are used to provide backup activators in accordance with the overcurrent protection. In addition, 

a proposal to develop a fault classifier by using only the local currents associated with real-time boundary stationary 

wavelet transform (RT-BSWT) and Clarke's transform is described. Evaluations prove the feasibility to rebuild the 

traditional directional protection by using RT-SWT and provided better performance and faster operating time than 

the conventional protection based on the discrete Fourier transform (DFT). The preliminaries results to the fault 

classifier proved be feasible to identify all 10 faults types correctness. As new functionalities to directional 

protection, the wavelet-based negative sequence unit can be used to identify the fault directionality to three-phase faults, 

even with severe voltage sags without memory strategies, which is not possible with the conventional protection.

MEMBROS DA BANCA:
Presidente - 1807863 - FLAVIO BEZERRA COSTA
Interno - 1196444 - RICARDO LUCIO DE ARAUJO RIBEIRO
Externo ao Programa - 1597497 - LUCIANO SALES BARROS
Externo à Instituição - FELIPE VIGOLVINO LOPES - UnB