Research On Low-Carbon Economic Dispatch Of Combined Heat And Power System Based On Wind Power Accommodation

With global warming,energy and environmental problems have become increasingly serious,and the problem of excessive carbon dioxide emissions has been widespread attention of countries all over the world.As a renewable energy,wind power is a wide range of sources which has the characteristics of zero emissions,but the problem of wind power accommodation hinders the development of wind power.In the winter,the heating supply in “Three North” region is prone to the problem of “wind-heat conflict”,so that the wind power insufficiently grid-connected space leads to serious wind accommodation problem and increased carbon emissions.In order to solve the above problems,combined heat and power system is proposed,including wind power,combined heat and power units,thermal power plants,the heating supply is coordinated by heat accumulator and the electric boiler to decouple thermoelectric coupling constraints,and the flexible operation of the system is improved.The main research contents are as follows:Firstly,the operating mechanism of the combined heat and power units with heat accumulator and the principle of abandoned wind absorption are studied.The wind-to-heat mechanism of electric boiler is analyzed,and electric boiler can be used as both electric load and thermal source,making full use of cheap electricity at night,and improving the peak shaving capacity of the system.From the point of view of source-load interaction,the principle of peak shaving for flexible load response is studied..Secondly,aiming at the problem of wind accommodation in winter in the “Three North” region.On the basis of the principle that the heat accumulator promotes the wind power accommodation,the wind power accommodation model of the coordinated heating supply strategy of start-stop electric boiler and heat accumulator is proposed in this paper,the level of wind power accommodation and economic and environmental costs of the system are studied.The relationship between the releasing heat power of the heat accumulator and the starting power of the electric boiler is deduced.Aiming at the infeasible solution of the data processing of electric and thermal models,self-regulating improved particle swarm optimization is used to solve the model.Through the example simulation,the level of wind power accommodation,the cost of coal consumption and carbon emission cost in four different ways of heating supply are analyzed,the accuracy of the proposed model is verified.Finally,in order to enable electricity consumers to take responsibility for carbon emissions,a low-carbon economic dispatch model of combined heat and power system considering flexible load is proposed,and optimizing objective is to minimize the comprehensive power generation cost and the carbon trading cost.On the basis of self-regulating improved particle swarm optimization,a compromise strategy based on small fuzzy satisfaction is adopted to solve the optimal solution of multi-objective functions.Through the example simulation,the level of wind power accommodation,the comprehensive power generation cost and the carbon transaction cost are analyzed under different operation modes and different scenarios,and the impact of different carbon trading prices on optimization results is studied.