The Planning Method For Intelligent Parking Lot Under Active Distribution Network Considering Its Supporting Capacity Of Reactive Power

With the advancement of industrialization,the fossil energy shortage and the increasingly serious environmental pollution have become an important environmental problem in large and medium-sized cities.Electric Vehicles(EV)(Electric),as an important means of energy conservation and emission reduction,have gradually become the focus of all the countries.On the other hand,the permeability of distributed generations(DG)in the distribution network is increasing gradually.Thus,The interaction and relationship between the new energy,economical operation of power system and the electric vehicles,is an important issue which active distribution network(ADN)and electric vehicles will be faced with in the future.In addition,as one kind of power electronic devices,the electric vehicle charging system has the regulation capability of reactive power.Thus,it is possible to use the electric vehicles to work as reactive power supporting means of the distribution network.Therefore,considering the reactive power supporting capacity of electric vehicles,this paper studies and analyzes the joint planning method of EV charging facilities and DGs.First,this paper puts forward the basic framework of active distribution network,and studies and models all the uncertain factors in the distribution network,namely,the output power of DGs,traditional load and electric vehicles' behaviors.Scene construction method is used to transform the uncertain factors into a series o f deterministic scenarios,which ensures the optimality of the planning scheme under different operating conditions.Secondly,analyzes the feasibility of electric vehicles' reactive power supporting to the grid,studies the coupling relations of active/ reactive power of the EVs' charging-discharge systems,and deduces the range of the reactive power under the condition that the active power is certain.Then,a two stage planning model is proposed,which is suitable for distribution networks with renewable DGs and EVs.The genetic algorithm with elitist strategy is used to solve the model.The loss of the battery life which is caused by the charging-dischargeing process is included in our model,and using Matlab simulation,the validity of the proposed model is proved in the 33-node distribution system.Finally,the comprehensive evaluation of the environmental benefits of the active distribution network is studied.By constructing a multi-level evaluation index system of ADN environmental benefits,which including energy consumption,pollution emissions,resource utilization and ecological coordination,a two stage combination evaluation model based on tradeoff analysis and principal component analysis is put forward.Through applied to some ADN planning schemes for case analysis,the validity of the proposed method is proved,and at the same time,the high environmental benefits of the optimal planning scheme in this paper is proved.