Research On Collaborative Optimization Operation Of Coupled Power And Transportation Networks Considering Demand Response And Reliability

The transportation sector is the second largest fossil energy consumer outside the power industry,and the electrification transformation of the transportation industry is an indispensable development direction under the trend of low-carbon emission reduction.Electric vehicles are the link that connects the transportation network and the power grid,and under its promotion,the interaction between the two networks is strengthened,achieving a close coupling state at the spatiotemporal level.However,solely considering the operational status of various constraints in the transportation network alone cannot maximize the benefits of the power transportation coupling network.Therefore,research on the collaborative operation of the two networks is an inevitable trend.Based on the above research background,this article starts from the coupling of the two networks and conducts research on the collaborative optimization operation of the power transportation coupling system from the perspective of demand side management.The main research work is as follows:Firstly,an electrified transportation network that is coupled to the distribution network and can be wirelessly charged has been established.Through independent system operators to uniformly manage the operation of transportation and distribution networks,they are eligible to charge road congestion fees and manage charging loads to minimize the operating costs of coupled networks.Among them,the path selection of electric vehicles follows the user equilibrium criterion,which further affects the spatial distribution of power load in the distribution network.In order to find the optimal power generation plan and road congestion fees,the optimal traffic electricity flow model was adopted.The realizability and advantages of the coupled network cooperative operation are verified through the analysis of a numerical example.Secondly,a double-layer demand response framework is further used to optimize the coordinated operation of the power transportation network.The upper layer of the framework is an independent system operator,and the lower layer is a traffic network and distribution network model that respectively consider the time-varying characteristics of traffic demand and power load,forming a coupled two network operation model considering demand response under multiple time sections.Next,the variable traffic demand was transformed into charging demand,and a coupled network electricity satisfaction model was constructed.Through the analysis of the example,it is verified that the collaborative optimization operation model considering demand response effectively reduces the total operation cost of the coupled network and realizes the safe operation of the coupled network.Finally,based on the double-layer coupled operation framework,the collaborative operation of the coupled network was optimized based on the reliability of the power transportation network.By optimizing the reliability of the coupled network,the distribution of traffic flow on the traffic side and the charging load on the distribution side can be improved.The numerical simulation verifies the role of optimizing the reliability of coupled network operation in the collaborative operation of power transportation network by comparing it with random path and spatial shortest path schemes,reducing the deterioration degree of different reliability indicators of the two networks.