Research On Economic Benefit Evaluation Model Of Hybrid Thermal Power Storage System

With the global energy crisis and the deterioration of the ecological environment,protecting the environment and increasing the development of renewable energy have become the consensus of all countries in the world.With its abundant resources,clean and pollution-free characteristics,wind power has attracted the attention of all countries.However,as the installed capacity of wind power continues to increase,serious wind abandonment problems have emerged.The problem of wind curtailment during the winter heating period in my country’s "Three Norths" area is particularly serious.In order to meet the heating needs of users,the cogeneration units operate in a "heat-fixed power" mode,which limits the power system’s peak shaving capacity,thereby making the power system Only limited wind power can be accepted.In order to promote wind power consumption,the northern region often adopts the method of installing electricity storage devices on the wind farm side and adopting wind power for heating.Electric boilers,heat storage devices,and electricity storage devices are added to the original electric heating system to form heat,electricity,Integrated energy system with storage and mixing.Connecting heat storage devices and electric boilers to the electric heating integrated energy system can effectively reduce the heat output of the cogeneration unit,and at the same time convert the wind power during the peak period of wind power into thermal energy for storage,and wait for the low period of wind power to supply heat to users and make full use of The combined and complementary advantages of the electric and thermal systems have effectively enhanced the peak shaving capacity of the power system and increased the receiving space of wind power.At present,most researches on the integrated energy system of heat,electricity and storage(hybrid thermoelectric storage system)focus on the optimal configuration of the energy storage capacity of the system and the optimal dispatch of the system.There are few studies on the comprehensive benefit evaluation of the hybrid thermoelectric storage system.And different thermoelectric storage hybrid structures,energy storage device configurations with different capacities,and different system scheduling schemes will all have an impact on the comprehensive benefits of the thermoelectric storage hybrid system.Therefore,the establishment of a comprehensive benefit evaluation model for the thermoelectric storage hybrid system has an impact on the hybrid thermoelectric storage system.The planning before the system project and the optimal scheduling after the project are of great significance.First of all,for the comprehensive benefit evaluation before the project of adding electricity storage device,heat storage device and electric boiler to the combined electric heating system,the article establishes the comprehensive benefit evaluation model before the project of the combined heat and power storage system.Starting from the benefits of economy,energy consumption and environment,the comprehensive benefit evaluation index system before the project of the thermoelectric storage hybrid system was established;according to the characteristics of the evaluation index and the weighting method,the method of combining the analytic hierarchy process and the coefficient of variation method was adopted.Determine the combined weight of the evaluation index,the analytic hierarchy process(AHP)method determines the objective weight of the evaluation index,and the coefficient of variation method determines the objective weight of the evaluation index,so that the evaluation index is more scientific and reasonable;the comprehensive index method is used for thermoelectricity Evaluation of the comprehensive benefits before the storage and hybrid system project.Through the combined heat and power storage system of four different combinations of electric heating system,electric storage device-electric heating system,heat storage deviceelectric boiler-electric heating system,power storage device-heat storage device-electric boiler-electric heating system,The comprehensive benefit evaluation verified the rationality and validity of the comprehensive benefit evaluation model,and provided a reference for the construction of the hybrid thermoelectric storage system.Then,in view of the comprehensive benefit evaluation of the dispatch operation after the completion of the hybrid thermal power storage system project,the article establishes the comprehensive benefit evaluation model of the hybrid thermal power storage system.Starting from the benefits of the four dimensions of economy,energy consumption,users,and environment,a comprehensive benefit evaluation index system for the thermoelectric-storage hybrid system is established;in order to ensure the scientificity and rationality of the evaluation index weights,the analytic hierarchy process-entropy method is used in the article-Game theory combined method to determine the weight of evaluation indicators,analytic hierarchy process to determine the subjective weight of evaluation indicators,entropy method to determine the objective weight of evaluation indicators,game theory method to combine subjective and objective weights;using weighting to approximate the ideal solution The ranking method(Technique for order preference by similarity to ideal solution,TOPSIS)evaluates the comprehensive benefits of different operating schemes.Finally,the article proposes a day-ahead optimal scheduling method for thermal power storage systems that considers user satisfaction,and establishes an electric heating satisfaction model that takes into account user power economy,power comfort,and thermal comfort;on this basis,the user’s electric heating Satisfaction and system power generation cost are the objective functions,and a day-ahead optimal scheduling model of thermal power storage system considering user satisfaction is established.Under the premise of ensuring user thermal comfort and stable power consumption,the user’s electrical heating satisfaction is adjusted and the wind power receiving space is increased.The particle swarm optimization algorithm is used to solve the simulation.The simulation results verify that the wind power receiving space of the thermoelectric storage system can be further improved by adjusting the user’s electric heating satisfaction,and the power generation cost of the system can be reduced.The comprehensive benefit evaluation model of the day-ahead dispatch of the thermoelectric storage hybrid system is adopted.The comprehensive benefit evaluation of the scheduling results is carried out.The evaluation results show that in the context of the system parameters used in this chapter,the comprehensive benefit score of the scheduling results when user satisfaction is considered is the highest.