| Wind/photovoltaic power generation itself has strong volatility and randomness,especially wind power generation.With the development of energy storage technology,energy storage technology has been regarded as an effective means to deal with these problems.Different from traditional energy storage modes,PEM electrolytic water hydrogen production technology has the advantages of wide range and fast dynamic response,while hydrogen is a clean and efficient energy source,which provides a new idea for the combination of energy storage technology and high proportion new energy grid.However,PEM electrolytic water hydrogen production technology is still in its initial stage.Therefore,this paper combines the direct coupling of electrolytic hydrogen production system with new energy generation as well as the application scenarios on the power grid side and user side.The main research contents include:(1)Using the output data of wind farm stations in new energy-rich areas,the probability distribution characteristics of wind power volatility are summarized and fitted with different heavy-tailed distribution functions;subsequently,a volatility fragment classification method based on the similarity of volatility characteristics is proposed to achieve effective classification of wind power volatility fragments while obtaining volatility characteristic parameters for measuring the fluctuation of wind power daily output curves;Combined with the parameters to measure the operation characteristics of the curves,the curves are clustered from the aspects of fluctuation characteristics and operation characteristics to realize the division of wind power output scenarios;On the basis of clustering,a typical operation curve generation method based on cloud model is proposed.An example shows that the generated curve can be used as a typical operation curve of hydrogen production by off-grid wind power generation.(2)Aiming at the application scenario of hydrogen production by gridconnected wind power to stabilize wind power fluctuation.Firstly,the gridconnected power and the operating power of hybrid energy storage system are obtained based on EMD decomposition.On this basis,the hybrid energy storage power is decomposed by adaptive sliding window algorithm considering economy,and then the rated capacity of supercapacitor and the rated power of electrolyzer are determined,so that the capacity configuration with both economy and fluctuation suppression effect is realized.Then the operation control strategy of hybrid energy storage system is formulated according to the state of charge of supercapacitor,rated power of electrolyzer and overall power instruction of energy storage system.Finally,combined with the actual operation data of wind farm,the simulation results show that the proposed method can effectively reduce the fluctuation of wind power output while realizing power distribution and ensuring the normal operation of energy storage components.(3)In order to promote the application of electrolytic hydrogen production system on the user side of power system and improve the economy of the system,an optimal dispatching operation model of electrolytic hydrogen production system on the user side is established.In this model,the maximum difference between the profit from selling hydrogen and the consumption of electricity and the start-stop cost of electrolyzer is taken as the objective function,and the optimization model is constructed by considering the change of time-of-use electricity price in combination with the operating characteristics of PEM electrolytic hydrogen production system and the minimum hydrogen production,and it is solved by CPLEX solver on MATLAB platform.Combined with the time-of-use electricity prices in different regions,the operation curves of electrolytic hydrogen production systems in different regions with different timeof-use electricity prices are generated,and the influence of different indicators on the economy of electrolytic hydrogen production systems is analyzed. |
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