Banca de DEFESA: DENIS KEUTON ALVES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : DENIS KEUTON ALVES
DATA : 23/04/2019
HORA: 09:00
LOCAL: ppgeec
TÍTULO:

Real-time estimation of power and impedance estimation of the grid through the stationary packet wavelet transform

PALAVRAS-CHAVES:

Grid impedance, power quality indices, power quality disturbances, realtime power estimation, wavelet packet 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:

The estimate of power quality indices has as primary goal provides to the monitoring systems (measurement, control, protection, etc.) information about proper levels of voltage and power quality. Besides power quality monitoring strategies, the knowledge of the grid impedance is fundamental importance to the understanding of the deviation of the electric power quality indices, providing relevant information to control and stability of the power system. In this context, in this thesis, it proposes the application of the stationary discrete wavelet packet transform (SDWPT) to estimate effective voltages and currents, as well as primary power quantities (active, total apparent, nonactive power, and power factor), and distortion power. Additionally, the analysis tools of signal processing developed in this work allowed the development of a method for estimating the grid impedance. The SDWPT provides a uniform frequency band and possesses the timeinvariance property, which is ideal for power estimation and grid impedance estimation in the real-time. The method of estimation of power quality indices was assessed and compared to the IEEE Standard 1459-2010 under different operational scenarios, where stationary synthetic waveforms and with both stationary and nonstationary power quality disturbances were emulating in an experimental setup. Regarding the grid impedance estimation, the current study was developing to identify the impedance of low voltage electric grids interconnected with distributed power generation systems. The primary goal is providing parameters to delimit the threshold of system instability in terms of the penetration level and identify islanding conditions. The validation of the proposed method was accomplished in a microgrid whose distributed generation is implemented through the photovoltaic plant of 8 kWp connected to the point of common coupling of a three-phase feeder composed by a transformer of 15 kVA. 

MEMBROS DA BANCA:
Interno - 2579664 - ALLAN DE MEDEIROS MARTINS
Externo à Instituição - EDSON HIROKAZU WATANABE - UFRJ
Presidente - 1807863 - FLAVIO BEZERRA COSTA
Interno - 1543191 - LUIZ FELIPE DE QUEIROZ SILVEIRA
Externo à Instituição - PAULO FERNANDO RIBEIRO - UNIFEI - UNI
Interno - 1196444 - RICARDO LUCIO DE ARAUJO RIBEIRO