Year: 2025
Type: article
Abstract: Differing from synchronous generators (SGs), grid-forming inverter-based resources (GFM-IBRs) exhibit rapid variations in their output impedances during transmission line faults due to the overcurrent limitation. As a result, the source dynamics during the fault period deviate significantly from those under prefault conditions. This fundamental difference alters the fault responses of incremental quantities, i.e., incremental voltages and currents, thereby jeopardizing the reliability of the supervising elements in protective relays that are based on these quantities. To address this challenge, a protection-interoperable fault ride-through (FRT) method for GFM-IBRs is proposed. This method dynamically adjusts the power control of GFM-IBRs in response to changes in output impedance, effectively mitigating variations in source dynamics and thereby preserving the reliability of incremental quantity-based supervising elements. This method also ensures effective overcurrent limitation and transient stability of GFM-IBRs. PSCAD simulations, controller hardware-in-the-loop (CHIL), and experimental tests validate the effectiveness of the proposed method.
Authors: Yifei Li, Heng Wu, Xiongfei Wang
Institutions: Aalborg University, Southeast University, Tsinghua University
Language: English
Subfield: Control and Systems Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4417523732