Research On Peak-shaving Technology Of Cluster Electric Vehicle Based On Interactive Energy Mechanism

With the rise of energy revolution and the constant change of energy structure,electric vehicles have made great progress in the field of transportation.At present the number of electric vehicles in cities has been considerable,and showing a rapid growth trend.The access of a large number of electric vehicles to the grid without control may cause many problems for the grid.At the same time,the electric vehicle charging load can be dispatched with great potential,which brings a new way for peak shaving of the grid.In this paper,the problem caused by the inconsistency of interests between the users of electric vehicles and the operators of distribution network during the charging process is analyzed,and the interactive energy mechanism is applied to the peak shaving process of electric vehicles in view of these problems.Firstly,in order to avoid the power congestion at the transformer of distribution network,a peak-shaving model based on interactive energy mechanism is established.Shadow price is used as the value incentive signal to coordinate the interests of cluster electric vehicle administrators and DSOs.The centralized optimization problem is transformed into a distributed optimization problem,and DSO is avoided from directly participating in the formulation of charging plan of electric vehicles,thus ensuring the fairness of the decision-making,the independence of the participants in the peak shaving process and the security of the user's car privacy information.Then,on the basis of the interactive energy mechanism,this paper introduces the SOCP relaxation model for optimal power flow calculation,introduces the constraints of node voltage and the optimization objective of reducing network loss under the premise of ensuring the convexity of optimization problem,and establishes a peak shaving model for cluster electric vehicles,which aims at avoiding network congestion,preventing node voltage from being too low and minimizing network loss.The simulation results show that the two peak-shaving models of cluster electric vehicles based on interactive energy mechanism fully take into account the interests of both the users of electric vehicles and the distribution network,and can achieve the established peak-shaving purpose on the premise that the users of electric vehicles can meet the charging demand at a lower charge cost.