After a fault disturbance

there is a risk of temporary overvoltage in areas where renewable energy is aggregated

which can lead to the disconnection of renewable energy and threaten the safe and stable operation of the power grid. The capacity of input access to a multi-input system affects the temporary overvoltage level. Therefore

there exists a maximum access capacity that prevents the renewable energy from disconnecting from the grid in the event of a fault disturbance. To solve for the maximum access capacity

this paper first analyzes the reasons for the temporary overvoltage in the renewable energy AC transmission system caused by the fault disturbance

according to the renewable energy low voltage ride through (LVRT) control strategy. Then

a mathematical model for solving the temporary overvoltage maximum value in such a system with multiple inputs is presented. On top of that

an optimization model for the maximum access capacity of renewable energy

which is subject to the constraint of overvoltage safety

is established. The optimization model is solved using the tracking center trajectory interior point method to obtain the maximum access capacity of the multiple-input system and the optimal output distribution of each renewable energy source. Further

the cosine similarity is used to evaluate which output distribution is better for the same access capacity. Finally

the effectiveness of the proposed method for quantifying the maximum access capacity of multi-feeder systems is verified in a practical engineering example.