Abstract: In order to solve the problem of voltage fluctuation caused by the centralized access of new energy in Inner Mongolia Power Grid, a cascaded passive parallel SVG topology model is proposed to control the incoming voltage of new energy gathering station, so as to ensure the stability of bus voltage of new energy gathering station. Taking a new energy gathering station in Inner Mongolia Power Grid as an example, based on the analysis of the electrical wiring of the primary structure, a design idea of installing cascaded H-bridge passive parallel SVG device on the low-voltage bus of the new energy gathering station is given and the control method of constructing voltage and current double closed-loop control system for the SVG device is proposed. The simulation model is used to verify the effectiveness of the method in restraining the bus voltage fluctuation of new energy gathering station by simulating the instantaneous rise and fall of bus voltage. According to the simulation, results show that the cascaded H-bridge passive parallel SVG device can be used as a method to suppress the bus voltage fluctuation of new energy gathering station, which provides a safety control measure for the centralized delivery of new energy.