Structure Optimization And Capacity Allocation Of Wind-thermal Power Coupling System Based On Hydrogen Energy

In order to achieve the double-carbon goal of ’ 3060 ’,the main power generation status of thermal power units is gradually weakened.And building a new-type power system with new energy as the main body will become the mainstream trend in the future.High proportion of new energy access brings uncertainty to the operation of the electric power system,and the contradiction between new energy consumption and reliable operation of the system is prominent.In order to improve the depth peaking limit of thermal power units and tap their potential to improve the new energy consumption ability,considering that hydrogen energy has the advantages of flexible storage,clean and low carbon,this paper constructs the wind-thermal power coupling system based on hydrogen energy,optimizes the design of its electric and thermal coupling structure and capacity configuration scheme,and uses the comprehensive evaluation method to explore the integrated application effect of hydrogen energy and windthermal power coupling system.Firstly,the overall structure of wind-thermal power coupling system based on hydrogen energy is constructed.The principle and mathematical model of each component in the system are expounded,including wind-thermal combined generation system,electrolyzer,hydrogen storage tank and fuel cell.The pinch method is used to optimize the heat transfer network in the coupling system.The results show that the thermal coupling between the thermal power unit and the high temperature fuel cell is feasible and reasonable,which increases the upper limit of the peak regulation of the thermal power unit and improves the response flexibility of the fuel cell.The optimization of system structure provides a design idea for the construction of a new hydrogen energy coupled power system.Secondly,the capacity optimization allocation model of wind-thermal power coupling system based on hydrogen energy is proposed.Considering the cost of investment,operation,carbon emissions and wind curtailment,an optimal capacity allocation model with economic optimization as the objective function is established.It is proposed to establish the optimal configuration model through the Yalmip platform and call the Gurobi solver to solve;based on the proposed wind-thermal power coupling system in a certain area,the configuration schemes under different capacity configuration modes and operation strategies are explored,and the influence of carbon price and equipment price on capacity configuration results is compared and analyzed.The results of the calculation example show that the configuration ratio of windthermal power capacity reaches 26 % under the strategy of fixing wind by thermal power and hydrogen.In the way of determining hydrogen by wind and thermal power,with the increase of the wind-thermal power capacity ratio,the flexibility regulation of thermal power units increases,and the demand for hydrogen energy equipment is gradually increasing.Through the sensitivity factor analysis,the capacity allocation of hydrogen energy equipment is greatly affected by the price of hydrogen energy equipment.The capacity allocation results of wind turbines are more susceptible to it.On the basis of structural optimization,capacity optimization configuration provides a configuration idea for system operation in different scenarios.Finally,a comprehensive evaluation model of wind-thermal power coupling system based on hydrogen energy is proposed.A multi-level and multi-angle comprehensive evaluation index system is established.Based on the capacity allocation scheme,the wind-thermal power coupling system under different technical paths is comprehensively evaluated by using the combination evaluation method of AHP-entropy weight method.The example results show that the high proportion new energy system supported by hydrogen energy has greater advantages in energy utilization,environmental protection and reliability compared with the battery energy storage system and the system without energy storage support.The proportion index of wind power has increased by 6.09% and 8.28% respectively,and the peak shaving capacity has increased by 7.83% and 10.17% respectively,but the overall economy is poor.The comprehensive evaluation of the system is helpful to intuitively get the advantages and disadvantages of the hydrogen energy system,and provide strong support for the development direction of the subsequent coupling system.