Impact of Inverter-Based Distributed Generation Integration on Current Seen by Overcurrent Relay: CIGGRE European MV Network Case

This study assesses the impact of integrating Inverter-based Distributed Generators (IBDGs) on the short circuit currents as is seen by overcurrent relays located at the heads of distribution feeders. The research highlights that changes in fault currents caused by the presence of IBDGs, it is evident that those inverted-based technologies have the potential to significantly influence the effectiveness and reliability of the electrical grid's protection systems by modifying the short circuit signature from the traditional one. Moreover, key variables such as the location and capacity of the IBDGS and the relative location of the short circuit insertion point have been identified as notably influencing these impacts. The importance of these findings lies in their contribution to a deeper understanding of how inverter fault response and the integration of IBDGSs affect fault currents. This knowledge is crucial for designing and developing more robust and effective network protection strategies and technologies. Therefore, this study serves as a cornerstone in the ongoing quest for more resilient network protection methods in an increasingly decentralised and complex energy landscape.