The Research Of Optimal Configuration And Operation Of Energy Hub In Multi Energy System

Traditional energy systems,such as power systems,natural gas systems and heat systems,are almost planned and operated independently,and lack of coordination and coupling with each other,which is not conducive to the economic and efficient operation of the energy supply system.With the development of energy internet,the coupling and internal dependence of various energy sources,such as electricity,gas and heat,have increased remarkably,and the interaction among source,network and load has been strengthened and the trend of coordinated operation of multi-energy system has become increasingly obvious.Multi-energy system is conducive to improving energy efficiency,reducing production costs,guaranteeing energy security,economy,efficiency and clean supply.As the key unit,the energy hub effectively integrates the advantages of different types of distributed generation,enriches the supply channels of energy and improves the reliability of the system.In the meantime,the widespread access to multiple energy interconnection and distributed renewable energy poses challenges to the planning and operation of energy hubs.In this thesis,the research on the configuration and operation of energy hub is carried out.The optimal configuration of energy hub considering the reliability and the double stochastic optimal operation model of energy hub with uncertainties are proposed.The main work of the thesis is as follows:A detailed mathematical model of various distributed power source is given in the thesis,such as fans,combined heat and power(CHP),gas boilers and electric and thermal energy storage units.Based on the above model,a input-output two-port network model of energy hub with conversion and storage is constructed.This model fully takes into account the impact of demand response on the model,and uses the load reduction to achieve optimal energy scheduling.In order to solve the optimal configuration of energy hub,expected energy not supplied is introduced to analyze the reliability of energy hubs,and the energy distribution optimization model considering the reliability is proposed.The optimization model of energy hub considering the reliability is put forward.The minimum cost of operation and investment is taken as the optimal economic objective and the penalty of negligible load is taken as the optimal reliability target.Combining with the optimization strategy,the optimal configuration of energy hubs considering the reliability is determined,and the optimal capacity and type of the components are determined.The obtained results show the ability of the proposed method in improving the reliability of load supply.Finally,this thesis studies the problem of optimal operation of energy hub considering uncertainties.Aiming at the uncertainties such as wind power,electric load and random disruption of components,a large number of initial scenes are generated by the combination of interval method and Monte Carlo.An optimal operation model of energy hub based on two-stage stochastic optimization is proposed.The upper-layer scheduling is based on the day-ahead scheduling in order to minimize the cost of energy hub operation.The lower-stage scheduling is adopted to correct the energy output and DG output power demand response as system reserve capacity.Through simulation calculation,the results of optimal operation of six energy hubs are contrasted,which provides new solutions and theoretical support for the optimal operation of energy hubs with uncertainties.