Research On Economic Dispatch Of Combined Heat And Power System Considering Wind Power Accommodation And Carbon Trading

In recent years,with the rapid development of economy,climate problems have become increasingly prominent.As the main source of greenhouse gases,the power system has great responsibility.And it is imperative to study the low-carbon economic dispatching strategy of power system.This paper focuses on two perspectives: wind power accommodation and carbon trading.Additional heat source and demand response are added to realize wind power accommodation and realize system low carbon economy operation.On this basis,the carbon trading mechanism is introduced to transform the carbon responsibility of generating units into the carbon trading cost.As a result,low-carbon and economic goals are achieved at the same time.Firstly,the feasibility of wind power accommodation by additional heat source and demand response is studied.The configuration method of thermal energy storage,the characteristics of CHP units and their operation strategies are studied.And the mathematical model of thermal energy storage is established.The working principle and advantages of electric boilers are introduced in this paper.And the advantages and disadvantages of the electric boilers on the power side and the load side are compared and analyzed.The start-stop strategy and mathematical model of electric boilers are introduced.The function and characteristics of demand response are analyzed.The characteristics of different types of demand response are compared and analyzed,and the concept of load aggregator is introduced to build a cost model.Secondly,an innovative source and load coordinative optimal dispatching of combined heat and power system considering additional heat sources and demand response is built.And the composition and energy supply mode are analyzed.An economic dispatch model is structured to minimize the abandon wind and generation operation cost.An modified empire competition algorithm is proposed to solve the model.An example of a practical power grid is analyzed,and four simulation scenarios are set up.The simulation results show that the additional heat source and demand response can promote the wind power accommodation,and can effectively achieve low-carbon economic operation of the system.And the low-carbon benefits and economic benefits of scenario 4 which considering both additional heat sources and demand response are the best.The correctness of the theory presented in this paper is verified.Although this dispatching mode realizes the transfer of power generation space from thermal power units to wind power units,the difference of carbon emission intensity between thermal power units is not reflected,so the next step of low carbon economy research is needed.Finally,based on scenario 4,the traditional economic dispatching model is modified to a low-carbon economic optimal dispatching model by adding carbon trading cost to the objective function,which reflects the difference of carbon emission intensity of thermal power units.The results show that after adding the carbon trading mechanism,on the basis of maintaining the low-carbon effect of the original model,the transfer of the output from high carbon emission thermal power units to that of low carbon emission units is further realized.and the effect of low carbon emission reduction is further increased.At the same time,the economic benefits brought by the reduction of carbon emissions make up for the increase of power generation costs and achieve the improvement of economic benefits.The impact of different carbon prices on the economic cost of the system is analyzed.The simulation results show that only by setting a suitable carbon price can the low-carbon and economic development of the system be better taken into account.