Research On Optimal Dispatch Of Hydrogen Production System In Independent Microgrid

With the rapid development of the economy and society,The problems of energy crisis and environmental pollution are becoming more and more serious,and the distributed power generation system has the advantages of economy,environmental protection,flexibility and reliability.Therefore,the microgrid system based on renewable energy power generation technology has been highly valued by countries all over the world.Due to the strong randomness,intermittentness and volatility of renewable energy.It has an impact on the stable operation of the microgrid system.Therefore,the reasonable optimization scheduling plays an important role in improving the reliability of the microgrid system.In order to realize the economic dispatch of independent microgrid and reduce the occurrence of wind and solar abandonment,this paper will use the excess electric energy generated by the wind power generation of independent microgrid to produce hydrogen by electrolysis.Thereby increasing the utilization rate of renewable energy.Firstly,this paper introduces the research background and significance of hydrogen generation optimal dispatch of independent microgrid,and expounds the research status at home and abroad.The structure of the independent microgrid system and the working principle of each micro power supply are analyzed in detail,and the mathematical model of each micro power supply is established.It provides a theoretical basis for the optimal scheduling of the microgrid..Secondly,the working principle of hydrogen production by electrolyzed water is analyzed and the hydrogen production model of electrolyzed water is established.The model controls the hydrogen concentration not to exceed the safe range limit,and then obtains the minimum limit variation range of the input power of the electrolyzer.It ensures the safe and stable operation of the electrolyzer in the production of hydrogen by using renewable energy,and realizes the variable load of hydrogen production in the microgrid.Thirdly,an independent microgrid optimization scheduling method considering the safe production of electrolyzed water hydrogen production system and the lowest natural gas consumption cost of micro gas turbine is proposed.According to the economic cost,operating status,safety of hydrogen production equipment and load demand of the microgrid system,different optimization scheduling strategies are formulated.The scheduling model of the independent microgrid hydrogen production system with electrolytic cell-battery hybrid energy storage is established.The objective function considers the fuel cost of the micro gas turbine and other factors.The constraints include the output of each micro power supply,the capacity and state of charge of the battery,and Constraints such as load loss rate,the proposed scheduling model is solved by CPLEX optimization software.Finally,in order to verify the feasibility of the proposed independent microgrid optimization scheduling strategy and algorithm,a case study simulation analysis iscarried out under matlab.The optimization results show that the electrolyzer can make full use of wind power to generate hydrogen,which can effectively reduce the occurrence of abandoning wind and light.The cost of gas consumption of micro gas turbines is limited to a lower level.The effectiveness of the independent microgrid optimization scheduling method proposed in this paper is verified.