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Luana C. S. Soares
Electrical Engineering Graduate Program, Federal University of Paraiba, PB
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Pedro A. de Alcântara
Electrical Engineering Graduate Program, Federal University of Paraiba, PB
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Lindemberg R. de Lima
Mathematics and Computational Modeling Graduate Program, Federal University of Paraiba, PB
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Camila M. V. Barros
Computer System Department, Federal University of Paraiba, PB
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Luciano S. Barros
Computer System Department, Federal University of Paraiba, PB
Keywords:
Three-phase microgrid, islanded operation, hybrid photovoltaic/battery unit, grid-forming droop control, state of charge-based control
Abstract
Microgrids based on photovoltaic array supplying do not have capacity to compensate imbalances between generation and load demand, which can occur in islanded operation and cause voltage and frequency deviations. Therefore, battery energy storage systems are inserted to help in microgrid regulation. Grid-forming droop control is applied for PV/battery hybrid units to be capable of controlling voltage and frequency in the islanded mode of the microgrid. The objective of this article is to present a performance analysis of this control, considering several load levels in microgrid including the ones when battery energy storage systems state of charge limits are reached, what is followed by its turning off. For this purpose, simulations were conducted in the MATLAB/Simulink environment using a simplified low voltage system. The results point out to the effectiveness of the control when the battery is connected to the system despite load changes, regulating voltage and frequency levels. However, with the battery disconnection, the control is no longer able to regulate microgrid operation.
