Low-Carbon Economic Dispatch Strategy Of Integrated Energy System With Wind Power Based On Interval Optimization

With the deep coupling between natural gas network and power grid,a gas-electricity integrated energy system has been formed.The gas-electricity integrated energy system has the potential to optimize system operation and gas emissions while meeting the energy demand of system.At least two open problems in gas-electricity integrated energy system optimal dispatch are as following: The schedulable factors of the system are not fully explored,and secondly the uncertainty of the prediction error of wind power is not fully considered.Focusing on these two problems,a interval optimization dispatch framework for gas-electricity integrated energy system is established firstly in this paper.At the meaning while,a general solution method of interval optimization model based on this framework is also proposed.And then,a day-ahead interval dispatch method of one-way coupled gas-electricity integrated energy system based on G2 P and a day-ahead interval scheduling method of integrated energy system considering gas-electricity bidirectional coupling based on P2 G are studied respectively.The main findings of this paper are summarized as follows:Firstly,a day-ahead interval optimization dispatch framework for gas-electricity integrated energy system is established.At the beginning,a common model for operation and dispatch of gas-electricity integrated energy system is presented.And then,base on this common model,a day-ahead interval optimization dispatch framework for gas-electricity integrated energy system is proposed and the wind power uncertainty is expressed in form of interval numbers.After that,a general solution method of the interval optimization dispatch framework is proposed.In the general solution method,the interval optimization model is transformed into a deterministic optimization model based on the interval order relation and possibility firstly.In order to avoid the problem of excessive optimization state caused by unit start-up and shutdown variables,a variable reorganization method is proposed.A Jaya algorithm is used to solve the transformed model,and the solution flow of this algorithm is also introduced.Secondly,based on the interval optimization dispatch framework for gas-electricity integrated energy system,a day-ahead interval dispatch method of gas-electricity integrated energy system considering G2 P is studied.On the premise of considering the wind power uncertainty,the influences of collaborative optimization between G2 P,pumped storage station and demand response are mainly studied in gas-electricity one-way coupling integrated energy system.With the objective of minimizing the operation cost and emission cost,a day-ahead interval operation model of gas-electricity integrated energy system based on G2 P.In this model,the power grid model with gas-fired unit,natural gas network model,pumped storage station model,and demand response model are established in detail.The whole model is solved by the proposed general solution method.And then,some case studies are carried out.The simulation results show that the proposed method can reduce the system operation cost and emission.Moreover,the interval optimization are good used to deal with wind power uncertainty.Finally,based on the day-ahead interval optimization dispatch framework for gas-electricity integrated energy system,a day-ahead interval dispatch method of gas-electricity bidirectional coupling integrated energy system is studied.In this method,a P2 G model is established and added into gas-electricity integrated energy system.On the premise of considering the wind power uncertainty,the coordinated operation between P2 G,G2P,pumped storage,and demand response is the key factors in the system operation scheduling to optimize the system cost and emission.The whole model is also solved by the proposed general solution method.Illustrated by some experiments,the proposed method can optimize the system operation cost and emission more effectively,compared with the gas-electricity unidirectional coupling integrated system based on G2 P,pumped storage station and demand response.