Optimal Configuration Of Integrated Energy System Based On Off-Design Characteristics Of Energy Hub

Under the dual challenges of fossil energy shortage and environmental degradation,countries are actively promoting energy system reform.With China’s goal of "carbon neutrality and carbon peaking",an integrated energy system that couples multiple forms of energy has become an important direction for future energy development.Integrated energy system is based on various energy production,conversion and storage facilities to promote the use of energy in a graded manner,which helps to achieve the goal of “double carbon”.In the study of integrated energy system,the energy hub model,which abstracts the complex structure within the system into multiple input-multiple output ports,is widely recognized and is often used to study the capacity planning and operation strategies of various coupled devices.Most previous studies have ignored the off-design characteristics of the equipment and treated the energy conversion efficiency as a constant value,which affects the accuracy of the results.In this paper,a method is proposed to establish an integrated energy system planning configuration with renewable energy output based on the off-design characteristics of energy hub.The main work is as follows.Firstly,this paper analyses the distribution characteristics and variation rules of natural resources such as wind speed and light intensity,which affect the output of renewable energy,and uses the scenario reduction method to establish a typical scenario set to convert the uncertainty problem into a deterministic one.Taking the wind speed and light intensity data of a certain place throughout the year as the research object,the k-means clustering algorithm is used to process the original data and select the appropriate number of clusters to generate the wind speed/light intensity typical scenario set.Secondly,this paper takes an integrated energy system containing wind power,photovoltaic,combined heat and power,gas boilers and energy storage equipment as the research object.The basic structure of the energy hub is introduced,the operational characteristics of the energy coupling equipment are analyzed and the variable operating conditions of the equipment are modelled.Based on the above research,a dynamic energy hub matrix is given to provide a model basis for the subsequent optimal configuration of the integrated energy system.Finally,a model for the optimal configuration of the integrated energy system based on the variable operating characteristics of the energy hubs is developed with the objective function of minimizing the average annual cost,and this mixed integer non-linear programming model is solved by calling the solver based on OPTI toolbox.A park is used as the research object to verify the effectiveness and superiority of the planning scheme proposed in this paper,and the differences between the planning and operation schemes based on the fixed and variable working conditions models are compared and analyzed.The results show that the configuration results of the variable working conditions model can reduce the energy cost of the system,which has better economic benefits and helps to achieve a scientific and reasonable capacity allocation of the integrated energy system.