Research On Operation Strategy Optimization And Evaluation Of Building Combined Cooling, Heating And Power Syste

Under the background of "carbon peaking and carbon neutrality",the transformation of energy structure has become the trend of the times.As a typical application form of integrated energy system,building combined cooling,heating and power(BCCHP)system has attracted wide attention.However,the complex energy coupling relationship makes the BCCHP system face serious problems of electrothermal mismatch.Based on this,this paper studies the operation strategy and evaluation of the building combined cooling,heating and power system.The main research contents are as follows:(1)Aiming at the problem of typical load day selection of building load,a CRITIC improved K-means clustering algorithm is proposed to solve the problems of huge calculation amount and data redundancy caused by a large amount of load data input.Taking the daily load rate and daily load fluctuation rate as the clustering characteristics,the CRITIC weighting method is used to weight the clustering characteristics,and the building load data is clustered based on the improved weighted K-means clustering algorithm.According to the clustering results,the summer,winter and transition season load typical days are selected.The typical daily load data is used to replace the building annual load data,which reduces the data complexity of the model calculation.In addition,the impact of climate characteristics and building type characteristics on building load characteristics is clarified by analyzing the building load characteristics.(2)Aiming at the problem of electrothermal mismatch during the operation of the building combined cooling heating and power system,a following hybrid load-energy storage characteristics operation strategy(FHL-ESC)is proposed to expand the electrothermal matching interval.Considering the participation of energy storage equipment in operation decisionmaking,the operation strategy proposed takes the capacity change of energy storage equipment as the pivot of operation mode conversion,and adjusts the operation mode timely to relieve the pressure of energy storage.With the optimal comprehensive performance of the system as the optimization objective,the particle swarm optimization algorithm is used to solve the model.The simulation results show that the following hybrid load-energy storage characteristics operation strategy proposed in this paper can significantly improve the comprehensive performance of the system.Compared with the traditional operation strategy,the system performance has been greatly improved,which proves the effectiveness of the proposed operation strategy in the BCCHP system.(3)Aiming at the performance evaluation problem of the building combined cooling,heating and power system,a BCCHP system evaluation framework considering multi-climate zones and multi-building types is constructed to realize multi-criteria evaluation of the BCCHP system.According to the energy coupling relationship of BCCHP system,a multi-criteria evaluation index system is developed.By analyzing the correlation of different characteristics and building load,the influence degree of climate characteristics and building type characteristics on the building load is obtained.At the decision-making level,information fusion is carried out,and the subjective weight of each index is determined according to the influence degree of different characteristics.The comprehensive weight distribution of each evaluation index is obtained based on the principle of minimum identification information.Aiming at the problem of low sample differentiation of traditional TOPSIS algorithm,the TOPSIS evaluation model is improved based on grey correlation analysis method and prospect theory.The simulation results show that the combined weighting method based on the information fusion of climate characteristics and building type characteristics has a more balanced weight distribution.Compared with the traditional evaluation framework,the proposed BCCHP system evaluation framework considering multi-climate zones and multibuilding types has better sample differentiation ability,and can evaluate the performance of each BCCHP system more comprehensively.