Análise das Variações de Potência em Plantas Fotovoltaicas de Grande Porte
Keywords: Utility-scale photovoltaic Generation, Power output variability, Partial shading, cloud shadow modeling, Fractals
AbstractOutput power fluctuation is one of the biggest concerns in photovoltaic (PV) generation. The power variability of short time scale, which is mainly caused by ground shadows generated by cloud movement, can deteriorate the frequency and voltage magnitude of power systems. Besides affecting the power quality, the typical output power fluctuations impose some challenges to the planning, operation and control of power systems. Thus, the understanding of the aspects that affect the power variability and the typical magnitude of these variations is fundamental to the proposition of operational and control approaches to mitigate the adverse effects caused by utility-scale PV systems. In this context, this work evaluates the impact of multiple meteorological conditions and technical parameters on the output power variability of PV power plants. Fractals are used to formulate an approach capable of synthesizing the global irradiance time series necessary to evaluate the output power variability. The results obtained from a case study of a 100 MWac PV power plant have showed that the meteorological conditions and the plant rated power play an important role in the magnitude of the output power fluctuations. The proposed approach and its outcomes may contribute to the proposition of new operational and control approaches to mitigate the adverse effects caused by PV power plants.