Abstract: As the key technologies for large-scale new energy generation grid connection, consumption and longdistance transmission, energy storage and DC transmission systems have developed rapidly in recent years. However,the access of large-scale energy storage increases the complexity of grid dispatching and brings challenges to the security and stability of the grid. This paper studies the coordinated control strategy of the multi-terminal HVDC transmission system with large-scale energy storage connected to the grid. Firstly,the grid-connected models of renewable energy and energy storage are analyzed, and the control strategies of wind power,photovoltaics and energy storage are given; secondly, the comprehensive energy control strategy of wind, thermal,photovoltaic, and storage multi-terminal DC transmission systems is proposed. Finally,the simulation model of five-terminal DC transmission system is built in PSCAD/EMTDC,and the proposed strategy in this paper is verified by simulation.The research shows that,based on the proposed strategy,the power fluctuation range of the receiving-end power grid under various working conditions is within ±5%,and the response time is less than 0.5 s. It has the ability of rapid adjustment,which improves the stable operation ability of the power grid in the area rich in new energy.