Abstract: To achieve the carbon neutral carbon peak target, a global energy system accelerating the transformation to future new energy will play a vital role in the power system. The blocking problem of a transmission line caused by high permeability of new energy will be the main factor limiting the scale of grid-connected new energy and the carrying capacity of the system. In this paper, a two-stage coordinated optimization scheme of a distributed static series compensator（DSSC） configuration is proposed to enhance the load-carrying capacity of a new energy grid having high permeability. First, the load-carrying capacity index of the power grid is proposed and a mathematical model of the DSSC is constructed, and the DSSC of the access system is programmed to maximize the load-carrying capacity of the system in a single planning cycle. Second, the installation location and quantity of the DSSC are optimized with the lowest system configuration cost to enhance the load-carrying capacity of the system after the high permeability new energy is connected to the grid. Finally, the proposed method is validated on the IEEE-RTS79 bus system and real power system simulation. Compared with a static series compensator（SSSC）, the proposed method is simple and reliable. The DSSC can make full use of the capacity of the transmission channel to effectively reduce the loss of new energy because of line blockage, enhance the permeability of the grid-connected new energy system carrying capacity, and help to achieve the dual carbon goal.