Análise da avaliação dos requisitos LVRT em níveis primários de distribuição de parques eólicos com DFIG

Abstract

This work aims to conduct a study and analysis of the evaluation of LVRT requirements at primary levels of distribution in a wind park with DFIG technology. The motivation for this study lies in the need to ensure efficient and reliable integration of wind parks into the electrical system, especially during disturbances such as voltage sags resulting from short-circuit faults. The theoretical foundation covers concepts related to voltage sags, short-circuit faults in power systems, wind energy, and DFIG technology. The adopted methodology includes mathematical modeling of system elements, the utilization of Simulink®, an integrated tool with MATLAB®, and the definition of simulation scenarios. The obtained results and discussion of case studies encompass system simulations under normal operating conditions in steady-state and during short-circuit faults, including symmetrical and asymmetrical faults. Based on the results, it is possible to analyze the capacity of the DFIG-based wind park to meet the LVRT requirements at primary distribution levels, considering different operating scenarios, various measurement methods, and system disturbances. Symmetrical short-circuit faults were found to cause more significant voltage sags, while single-phase faults had a lesser impact on the wind park’s performance. It is important to highlight that the LVRT requirement was met in approximately 94% of the simulated voltage sag scenarios investigated in this study, indicating that the wind park would continue operating even during the occurrence of these events. Only in 6% of the cases, the wind park would be disconnected.