Optimal Configuration Strategy for Grid-Forming Stations in Renewable Energy Bases to Enhance Short Circuit Ratio

Due to the lack of local synchronous power support and its remote geographical location, renewable energy bases in desert and gobi regions (REBD) exhibit low short-circuit ratio (SCR) and low inertia characteristics. To enhance the SCR of REBD, first analyze the control principles of grid-forming stations (GFMs) based on virtual synchronous generator control. Then, investigate the voltage support mechanism of GFMs considering converter current limiting. Subsequently, the impact of GFMs on the multiple renewable energy stations short circuit ratio (MRSCR) is analyzed, and a weighted reactive compensation priority index for each node is constructed to determine the configuration sequence of GFMs. Thereby, an optimal configuration strategy for GFMs and synchronous condensers (SynCons) to enhance SCR is proposed. Finally, the effectiveness of the strategy is validated through simulations using a case study of an REBD in Northwest China that lacks synchronous power support.