Análise da influência de parques eólicos em diferentes princípios de polarização de relés direcionais de sobrecorrente

Abstract

The increasing integration of inverter-based resources into the electric power system has significantly changed the behavior of fault currents and overall system dynamics. These changes directly affect the reliability of conventional protection schemes, especially directional overcurrent relays (67), which rely on the angular relationship between current and voltage to determine fault direction. In this context, this work proposes a systematic methodology to evaluate the performance of different 67 polarization principles in systems with inverter-based resource integration. The proposed methodology includes modeling a representative test system with and without a wind farm connected to the grid, developing an algorithm for simultaneous testing of polarization principles, and establishing evaluation metrics for relay parameter tuning. The results demonstrate that the presence of inverter-based resources alters the operating conditions of 67 relays, potentially compromising accurate fault direction detection. The analysis identified which polarization principles provide greater robustness and stability under different fault scenarios and operating conditions. Thus, this study advances the understanding of 67 protection performance in modern systems, offering technical and methodological insights for adapting protection schemes to the growing penetration of inverter-based sources.