Electric Vehicle Energy Management Strategy Of Renewable Energy Consumption/Smoothing Load

With the increasingly worse issues in environment and energy,distributed new energy power generation and electric vehicles are being vigorously promoted all over the world.As the gradually improving permeability of the electric vehicle and distributed power generation in the power grid,more attentions should be paid to problems result from the randomness and fluctuation of the new energy power generation output and the uncertainty and impact of time while electric vehicle charging grid.Therefore,this paper discusses the orderly control of distributed new energy and electric vehicles in the distribution network under this big background.This paper first summarizes the previous researches in distributed power output modeling,vehicle random trip simulation,electric vehicle orderly charging,and analyzes the advantages and disadvantages of the existing research.Based on the previous studies,this paper analyzes the probability distribution of distributed wind and light,and establishes the equivalent source model by semi invariant method.And on the basis of that,a method to evaluate the peak-valley index of equivalent wind and solar load curve is put forward.Next,this paper analyzes the electric vehicle load modeling based on the random trip simulation,elaborates and supplements previous studies.Parking areas are divided into four kinds of equivalent areas by classifying the electric vehicles parking spots;the electric vehicle load model is established based on the study on the characteristics of travel and charging of EVs in the stochastic simulation of vehicle travel.Finally,on the basis of the equivalent source load curve and vehicle travel stochastic simulated electric vehicle load model,a three-layer electric vehicle energy management model is constructed,clearly dividing the labor between grid-side dispatching center and charging service provider,which is more in line with the operation of a mature and large-scale electric vehicle industry.In the energy management strategy,two working modes of tight coupling and loose coupling are proposed,which respectively realizes the valid interaction between the network side and the charging service providers by issuing the guiding power and the guiding electricity price,and achieve network side to promote new energy consumption/smoothing load and to encourage charging service providers to accept the instructions to autonomously control the electric vehicle demand in the controlling areas under the premise of sased model,and reaches a win-win situation between the network side safe and economic operation index and charging service providers’ self demands.tisfying the grid constraints,the battery constraints,and the constraints of the electric vehicle owner.The example verifies the feasibility and effectiveness of the two working modes.