Generalized short circuit ratio (gSCR) is able to characterize the small signal stability of multi-infeed system with power electronic devices. Based on the gSCR index

the allocation optimization problem of grid-connected capacity of each feeding point is investigated when the total grid-connected capacity of photovoltaic (PV) devices (or fields) is fixed to make the small signal stability margin of multi-infeed PV system maximized.Firstly

the small signal stability analysis model for multi-infeed PV system is established.Secondly

based on the sensitivity of gSCR to grid-connected PV capacity at each feeding point

a capacity optimization method for multi-infeed PV system is proposed. Finally

with three-infeed PV system as an calculation example

the feasibility and effectiveness of the proposed capacity optimization method are verified.The simulation results show that the reasonable distribution of grid-connected PV capacity accessed to multiple points can effectively enhance the gSCR of multi-infeed PV system and increase the small signal stability margin.