Combined Heat And Electricity Modeling And Wind Power Accommodation Analysis Of Integrated Energy System

Energy is the bedrock of the survival and development of human society.In the face of growing energy demand and the ever-severe pressure on environmental protection,improving the utilization efficiency of energy systems and the proportion of renewable energy accommodation has become an urgent need for human beings to achieve green development.Integrated energy systems featuring multi-stream synergy and multi-energy complementarity are one of the most important solutions to current energy and environmental problems.However,the differences in the characteristics of different energy forms pose challenges for achieving multi-energy synergy and complementarity.In order to solve the above problems,the paper investigates the combined calculation of thermal and electric energy in the integrated energy system,as well as the synergy of thermal and electric energy and the mechanism of wind power accommodation by adding electric boilers and heat accumulators to the system respectively,from the perspective of joint and unified analysis of electric and heating networks,using mathematical modeling and optimization calculation.Firstly,the steady-state flow model of the electric network and the Newton-Raphson method for solving the flow model are deformed and derived from the perspective of combined calculation of thermal and electric energy,respectively.Secondly,by analyzing the commonality between the heating network and the electric network,a heating network flow model matching the power network flow model is established,and the model contains the water circuit condition model and the heat circuit condition model of the heating network respectively,and the calculated values of the model are compared with the actual values by taking an actual heating network as an example.Further considering the coupled conversion relationship between thermal and electric energy in the integrated energy system,a combined heat and power flow model was established for the combined calculation of thermal and electric energy,and the calculation results of the model were compared with those of MATPOWER toolbox and APROS simulation software respectively.Finally,the optimization model of combined thermal and electric energy considering wind power accommodation is established to minimize the operation cost of the system.The effect and mechanism of wind power accommodation under different scenarios such as adding electric boiler or heat accumulator to the system are comparatively studied.The model comparison results show that the developed combined heat and power flow model has high accuracy.The optimization results show that adding electric boiler or heat accumulator in the system can increase the proportion of wind power accommodation,as well as reduce the operation cost.However,the wind power accommodation effect and the accommodation mechanism of electric boiler and heat accumulator are different.Adding an electric boiler has a better wind power accommodation capacity than adding a heat accumulator,while adding a heat accumulator reduces the operating cost of the system more than adding an electric boiler.