Research On Decoupling Planning And Coordinated Scheduling Of Thermoelectric Units For Wind Power Absorption

Under the "two-carbon" goal,the installed capacity of wind power,photovoltaic and other renewable energy grows rapidly,which poses a great challenge to the clean energy consumption capacity of the power system.In order to implement the national renewable energy priority online,improve the capacity of large-scale renewable energy consumption,the peak regulation flexibility of thermoelectric units needs to be further explored and improved.Therefore,this paper takes the thermoelectric decoupling planning and coordinated dispatching of cogeneration units as the research topic,and studies the thermoelectric decoupling planning method of thermoelectric units and coordinated dispatching of the network at the receiving end after coupling.The main work of this paper is as follows:Firstly,in order to solve the problem of high system wind curtailment caused by the coupling of electricity and thermal output of thermoelectric units,a coordinated planning model of thermoelectric decoupling for multiple CHP units was proposed,which took into account wind power volatility and load-side demand response.In this model,an improved light robust optimization method is used to deal with the volatility of wind power output on the source side,and the influence of electricity price type demand response on the planning results is considered on the load side.In this model,the minimum operating cost of the system after thermoelectric decoupling and the maximum capacity of the heat storage tank and the electric boiler are configured with the double objective.The improved ideal point method is used to reprocess the double objective function,which improves the solving efficiency and avoids the subjective error of the planning result caused by the artificial setting of the weight of the two objective functions.The simulation results show that the proposed thermoelectric decoupling coordinated planning model for multiple CHPS with demand response can effectively reduce the system planning cost,and the optimization effect of demand side response on the electrical load curve can compensate the wind abandon cost caused by the improved light robust optimization method for wind power output.Secondly,considering the characteristics of the heat network in the decoupling planning of the combined heat and power system,the decoupling planning model of the combined power and power system considering the characteristics of the heat transport pipeline is constructed.The model no longer assigns heat storage tank or electric boiler to each cogeneration unit,but realizes thermoelectric decoupling by assigning heat storage tank and electric boiler to the heating station of thermal system Through the analysis of the example,the delay effect of the heat transport pipeline has the effect of "peaking and valley filling" on the heat load of the system,and the heat attenuation characteristic of the heat transport pipeline has the effect of improving the heat load.Considering the characteristics of heat network in the planning of thermoelectric decoupling of combined heat and power system can effectively reduce the total cost of planning operation and increase the consumption of wind power.Thirdly,in order to improve the green power absorption capacity of Beijing power grid,a coordinated dispatching model of receiving power grid including heat storage and electric boiler is proposed.In this model,the flexible adjustment ability of the high voltage direct current transmission link of the receiving power network and the improvement of green electricity absorption ability of the gas-steam combined cycle unit under the operation mode of "two-towed one" and "one-towed one" are considered.The example analysis shows that under the synergic action of heat storage tank and electric boiler,some combined cycle units shift from the"two-towed one" operation mode to the "one-towed one" operation mode,which makes room for the system wind power and high-voltage direct current connection line to transport clean energy online,and improves the transmission capacity of direct current connection line.The system has better economic benefits.It can effectively help realize the goal of "double carbon".