Abstract
Large-scale integration of renewable energy sources (RES) is raising emerging issues of power system frequency stability. The lack of inertia in the use of power electronic converters (PEC) leads to a high rate of change of grid frequency (RoCoF) during load-generation imbalance conditions, which implies a systematic risk of cascading trips. This emerging issue has raised the risk of unexpected low-frequency load shedding and major power interruption events. Operators are thus forced to limit the share of renewable energy, but this measure will severely hinder the penetration of renewable energy in the future power system. Aiming to improve the friendliness of large-scale RES integration, the PEC, as the connection interface to the grid, is supposed to provide inertial support to enhance power system stability. This paper will propose a novel inertial simulation scheme (IES), including the energy topology design and the corresponding grid-forming control strategy, to imitate the dynamic behaviour of an equivalent synchronous generator (SG). When the PEC in the entire power system performs similar inertial characteristics as SG, the system frequency stability will be substantially improved, thus further increase in RES participation can be achieved.
Published Version
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