The integration of large scale renewable energy bases in desert gobi regions into power grids via split win ding transformers often suffers from insufficient multiple renewable energy stations short circuit ratio (MRSCR).Traditional solutions require deploying distributed synchronous condensers (DSCs) on the low voltage sides of the split winding transformers

but this approach leads to prohibitive investment and operational costs.To address this issue

this study first analyzes the impedance characteristics of split winding transformers and proposes upgrading 10%of renewable energy capacity with grid forming energy storage

complemented by voltage support devices on each low voltage side.By comparing the MRSCR enhancement effects of DSCs and grid forming storage

an optimization strategy for the low voltage winding capacity of split winding transformers is developed.On this basis

a synergistic three in one configuration method combining “DSCs grid forming storage split winding transformer low voltage capacity” is proposed to enhance MRSCR while reducing overall costs.Finally

a case study of a 1000 MW photovoltaic plant integrated into the Ningxia grid via three split winding transformers was conducted

verifying both the technical feasibility and economic benefits of the proposed method.