In order to solve the voltage instability problem under the influence of the increasing proportion of new energy in the receiving power grid and DC power outside the region, the research on the influence and control of new energy access on the dynamic stability of the power grid is put forward. Firstly, based on the improved small signal analysis method, the dynamic voltage stability model of the new energy receiving power grid is established. Then, considering the uncertainty of wind power, photovoltaic and load, aiming at the minimum total planning cost, a new energy receiving power network planning model considering dynamic voltage stability is established and solved. Finally, the simulation results show that the proposed new energy receiving power grid planning model can improve the receiving power grid’s ability to accept future new energy and load uncertainty. The experimental results show that the configuration capacity of various types of equipment in the new energy receiving power grid has increased except for thermal power units, and the investment cost of scenario 2 has increased by 6.32% compared with scenario 1 in the planning period. Considering that the energy demand of wind power, photovoltaic output and load is uncertain, it will lead to the phenomenon of abandoning wind and light. In the second scenario, the energy storage system has a certain capacity margin, which can make full use of the efficient coordinated operation among energy storage, peak shaving units and controllable loads, reduce the energy purchase cost and improve the consumption of new energy. Therefore, the overall operating cost of the second scene is reduced by 51.42% compared with that of the first scene, and the overall wind rejection rate and light rejection rate are reduced by 62.76% and 64.01% respectively.