Abstract: The optimal configuration scheme for the electric-hydrogen hybrid energy storage capacity considering the operating characteristics of alkaline electrolytic is proposed for the problem of the electric-hydrogen hybrid system to stabilize the fluctuation of new energy connected to the new power system. Based on empirical mode decomposition, the original wind power signal is decomposed into power components that meet the grid-connected fluctuation limit and mixed energy storage power tasks. On the basis of comprehensively considering the charge and discharge power constraints and storage state constraints of medias of electrochemical energy storage and hydrogen energy storage, a hybrid energy storage energy management strategy that takes into account the operating characteristics of alkaline electrolyzer is formulated. Based on this strategy, an electric-hydrogen hybrid energy storage capacity allocation model for smoothing wind power fluctuations is established with the goal of minimizing the comprehensive cost. On the premise of satisfying the demand for stabilization, it shows that the economy of the system is improved by the capacity allocation scheme under the proposed strategy to a certain extent in the analysis of an example.