| In recent years,with the development o f energy Internet and integrated energy system(IES),scholars at home and abroad begin to pay attention to the coupling relationship and synergistic effect between the power system and the transmission and distribution network.Under the framework of IES,the research focuses on the modeling,power flow analysis and dispatching operation of the electric-water integrated energy system(EW-IES).At present,in the study of EW-IES,the coupling element of electricity and water only considers the electric driven water pump,neglecting the correlation effect of the comprehensive load of electricity and water on the two systems.At the same time,there are a lot of random factors in EW-IES,like power system and other forms of comprehensive energy system.However,there is no research on the probability analysis of EW-IES.On the other hand,the power / water load and power water comprehensive load in EW-IES may have flexible load that can participate in demand response(DR).However,the existing studies on EW-IES do not consider the impact of DR on system operation and scheduling,and fail to fully explore the potential role of these flexible loads participating in DR in improving the economy and flexibility of EW-IES.This paper takes the regional EW-IES formed by the coupling of distribution network and water distribution network as the research object.Aiming at the limitations of the existing research,it focuses on DR modeling and its application in the probability analysis and optimal scheduling of EW-IES.The main work is as follows:(1)Establish the price / direct control DR model of water load and electricity water comprehensive load.Based on the time-sharing price mechanism and the demand price elasticity theory,the price DR model of water load is established by referring to the modeling idea of price based power DR and considering the load’s transferability and reducibility.O n this basis,the sensitivity of comprehensive load to electricity price and water price is described by the elastic weight of electricity price and water price,and the coupling of two price signals is realized,so as to establish electricity-Price DR model of water comprehensive load.In this paper,the direct control power DR model is extended to water load and electricity water comprehensive load,and the DR model of two kinds of direct control load,which can reduce load and transfer load,is established.(2)The EW-IES probability analysis method considering the uncertainty of price DR is proposed.The price DR model is applied to the power water combined power flow analysis,and the effectiveness of the price DR model and its influence on the power water combined power flow are verified by an example.O n this basis,aiming at the deficiency of the existing power water combined power flow limited to deterministic power flow analysis,the uncertainty of price DR is further described by the randomness of basic load and price elasticity coefficient,and the uncertainty and correlation of new energy output and power/water load in EW-IES are comprehensively considered.Based on Monte Carlo simulation method,the probability analysis of power water combined power flow is realized.An example is used to verify the effectiveness of the proposed probability analysis method and analyze the impact of the uncertainty of price DR on EW-IES.(3)An optimal scheduling method of EW-IES considering direct control DR is proposed.The proposed direct control DR model is applied to the scheduling decision of EW-IES,taking DR response,wind power reduction,relative rotation speed of electric driven pump,inflow/outflow flow of impoundment pool as decision variables,taking the minimum total cost of EW-IES as goal,considering various operation constraints of distribution network,water distribution network and coupling elements,the EW-IES optimal scheduling model considering direct control DR is proposed,and the intelligent algorithm is used to solve the proposed model The dispatching model realizes the joint optimal dispatching of distribution network and water distribution network.An example is used to verify the effectiveness of the proposed optimal scheduling method for EW-IES,and the impact of direct controlled DR and reservoir capacity on the operation scheduling of EW-IES is analyzed. |
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