Uso da transformada wavelet para análise dinâmica de um sistema fotovoltaico conectado à rede e sua interação com a rede elétrica
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2018-03-09
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Universidade Federal de Goiás
Resumo
This work presents a study on the application of the wavelet transform in the monitoring and
analysis of the power quality and in the detection of islanding conditions in distributed generation
systems, addressing a grid connected photovoltaic system as a case study. Initially, an introduction
about distributed generation systems, standards and requirements for operation was made. Next,
the concepts and parameters related to electric power quality and islanding conditions are
presented. Then a review of the wavelet transform is presented, showing the concept of
multiresolution analysis and the main applications in the topic addressed. The wavelet transform is
an important contribution to time-frequency localization methods for the analysis of transient
signals. A multiresolution analysis was proposed through the discrete wavelet transform for
voltage analysis at the common coupling point between the generation system and the electric grid.
The standard deviation and the variation of the details coefficients of the wavelet transform were
used for the detection and classification of disturbances. In the application of the method, pure
sine-wave voltages with different types of disturbances were considered: voltage sag, voltage
sweel, interruption, oscillatory transients and noise. And three cases of dynamic island detection
were simulated with a grid connected photovoltaic system. The results obtained are presented and
discussed for validation of the wavelet transform application in the analysis of grid connected
photovoltaic systems.
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Citação
CESAR, Thaissa de Melo. Uso da transformada wavelet para análise dinâmica de um sistema fotovoltaico conectado à rede e sua interação com a rede elétrica. 2018. 94 f. Dissertação (Mestrado em Engenharia Elétrica e da Computação) - Universidade Federal de Goiás, Goiânia, 2018.