Abstract: Taking a photovoltaic-concentrating solar power (PV-CSP) hybrid power plant (including 100 MW CSP) in Xinjiang Uygur autonomous region as the research object, following three system configurations were designed: configuration Ⅰ integrates electric heaters for high-temperature molten salt in parallel with the steam generation section of CSP system; configuration Ⅱ integrates electric heaters for low-temperature molten salt in parallel with the feedwater preheating section; configuration Ⅲ allocates electric heaters proportionally across the low-and high-temperature molten salt storage sections. Simulation analyses under multi-load conditions ranging from 40% to 100% turbine heat acceptance (THA) show that: configuration Ⅰ achieves the highest thermal efficiency, round-trip efficiency, and exergy efficiency under full load conditions, which reaching 45.12%, 54.73%, and 69.67% under 100% THA condition, respectively; configuration Ⅱ exhibits strong capability in replacing high-pressure feedwater heaters, which can effectively displace extraction steam and realize excess power generation, and the high-pressure feedwater heaters can be completely replaced by a electric heater with 29.8 MW power under 100% THA condition; although configuration Ⅲ can enhance operational redundancy and has the potential for load sharing, its improvement in performance is limited and it increases the system complexity. Therefore, for the PV-CSP coupled electric-heating molten salt storage system, configuration Ⅰ is recommended as the optimal choice.