| Driven by the goals of carbon emission peak and carbon neutrality,the wind power technology has entered a stage of rapid development.However,the wind power has the characteristics of volatility,randomness and anti-peak shaving,which will bring serious challenges to power quality,power peak shaving,system security and system stability.As a new type of energy storage technology,hydrogen energy storage has the advantages of clean and low carbon,high energy density,long storage time and fast response speed,therefore,it is one of the preferred solutions to solve the problem of wind power grid connection.However,there are also certain limitations in power regulation characteristics.It is still difficult to meet the requirements of the power system for a single hydrogen.Therefore,the hybrid energy storage system with hydrogen energy storage as the main body is taken as the research object,and researches are carried out on the architecture,energy management and optimized operation of the hybrid energy storage system in this paper.The main research contents include:(1)The mathematical model of energy storage is established,and the coordinated operation scheme of electric hydrogen hybrid energy storage is proposed.Electrolyzer,hydrogen storage system,fuel cell are three subsystems of electrochemical energy storage and hydrogen energy storage.After comparing technical parameters and performance,we complete the category selection,and establish a mathematical model to analyze the input-output relationship and operating characteristics of each module.On this basis,the architecture of the electric-hydrogen hybrid energy storage system is determined;and a coordinated operation scheme of electrichydrogen hybrid energy storage is constructed in four aspects of wind power distribution,energy management strategy,hydrogen energy storage modularization and multi-time scale processing.(2)In view of the fluctuation of wind power grid connection.Considering the operation characteristics of alkaline electrolyzer,the strategy of electric-hydrogen hybrid energy storage to stabilize wind power fluctuations is proposed.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 different energy storage media,a hybrid energy storage energy management strategy that takes into account the operating characteristics of alkaline electrolyzers 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.(3)In view of the problem of system peak shaving,an optimal operation model of power system containing electric hydrogen hybrid energy storage is established.On the basis of satisfying the normal operation constraints of the system,the charge and discharge power constraints and capacity constraints after modularization of hydrogen energy storage is considered,minimizing the comprehensive cost including carbon transaction cost,penalty cost of over-limit fluctuation and penalty cost of wind abandonment is taken as the goal to build an optimized run model.Finally,the CPLEX solver is used to calculate the actual data.The results of the calculation example verify the effectiveness of the proposed model,and demonstrate the ability of the electric-hydrogen hybrid energy storage to stabilize the fluctuation,peak regulation and wind power consumption of the power system.Through the sensitivity analysis,it is proved that a reasonable ratio of hydrogen energy storage modules can improve the capacity utilization rate and reduce the overall cost of the system. |
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