| Due to the large total installed capacity of CHP units during the winter heating period,the proportion is high,resulting in a high level of unit output,which limits the wind power grid space and high wind abandonment rate.Carry out research on source-load coordinated scheduling of combined electric-heating system taking into account the coupling characteristics of electric-heating sequence,which can improve the regulation ability and flexibility of the system,realize the complementarity of electric-heating advantages,solve the problem of system peak regulation,realize clean energy consumption,and improve system operation economy,etc.significant.Combined with the current research on combined electric and heat systems,this paper firstly conducts a theoretical analysis of the coupling characteristics of electric and heat time series,analyzes the electric-heat coupling relationship between the electric boiler and the heat storage device in the thermal power plant on the source side,and analyzes the electric-heat coupling between the electric boiler and the heat pump on the load side relation.A mathematical model of the time-delay of heat energy transmission in the central heating network and the virtual energy storage characteristics of heating buildings is established.In order to analyze the flexible adjustment ability of the electric power of the CHP unit,a mathematical model for tracking the target set power was constructed,and the flexible adjustment ability of the thermal power plant with electric boiler and heat storage device and electric heating on the load side were analyzed.This paper analyzes the feasibility of the secondary heat grid side distributed electric heating participating in the system regulation,and constructs the operation strategy of the secondary heating grid side electric heating load aggregator.Aiming at the problem of response uncertainty of electric heating users,this paper introduces the separation model of individual users’ non-response scheduling and all users’ non-response scheduling,and then constructs the risk index of electric heating response uncertainty.Taking the minimum operating cost as the goal,a two-stage decision-making model for electric heating load aggregators based on direct load control and indirect load control is constructed,and a strategy for load aggregators to participate in demand-side bidding operations is proposed.Taking a load aggregator with multiple electric heating users as an example,the feasibility and effectiveness of the proposed operation strategy are analyzed.On the basis of the above research content,this paper analyzes the problem that indirect controlled electric heating users indirectly participate in system regulation by signing interruptible contracts,and studies the control method of directly controlled electric heating users.From the perspective of the system,the scenario method is used to solve.To deal with the uncertainty of wind power,a source-load scheduling model of combined electric-heating system that takes into account the interruptible load of electric heating is constructed.The analysis of an example shows that after the secondary heating grid side is equipped with electric heating,the output of CHP units decreases more significantly than that of thermal power plants equipped with electric boilers;the more electric heating users participating in the regulation of the aggregator,the lower the response risk value of the indirectly controlled electric heating users,the directly controlled electric heating users can bear the uncertainty of the indirect user response,which reduces the operating cost of the aggregator;considering the thermal inertia of the heating system,after the electric heating is configured on the secondary heating network side,the total coal consumption is reduced,the power of the wind farm increases,and the thermal load and output power of the unit are significantly reduced during the wind abandonment period,providing space for the wind power to be connected to the grid. |
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