High proportion of new energy access and weak grid structure in remote areas result in weak power network strength and frequent voltage overlimit. Traditional voltage regulation methods are not effective in controlling voltage overlimit in weak grid. This paper compares traditional voltage stability schemes and the installation of Energy Storage Type Intelligent Soft Open Point (E-SOP) between regional networks. By establishing a system impedance model and comparing the P-V and Q-V curves of different schemes, it is concluded that the scheme of installing E-SOP in weak networks not only has the best voltage support effect, but also is cost-effective. Multiple supports for node voltage are achieved through active power penetration between regional networks and providing energy support from both the device itself and energy storage by using Grid-forming (GFM) type control and has been verified by simulation results.