doctoralThesis
Estimação em tempo real de potência e impedância da rede elétrica utilizando a Transformada Wavelet Packet Estacionária
Fecha
2019-04-23Registro en:
ALVES, Dênis Keuton. Estimação em tempo real de potência e impedância da rede elétrica utilizando a Transformada Wavelet Packet Estacionária. 2019. 116f. Tese (Doutorado em Engenharia Elétrica e de Computação) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Alves, Dênis Keuton
Resumen
This thesis proposes the application of the stationary discrete wavelet packet transform
(SDWPT) to properly estimate 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 developed to identify the impedance of low voltage
electric grids interconnected with distributed power generation systems. The validation of
the proposed method was accomplished in a distributed generation implemented through
the photovoltaic plant of 8 kWp connected to the point of common coupling of a threephase feeder composed by a transformer of 15 kVA.