| In recent years,with the increasing proportion of wind power,photovoltaic and other renewable energy generation in the grid,its randomness and intermittence bring great challenges to the safe and stable operation of the grid.In order to deal with this challenge,it can be solved by traditional ways such as increasing capacity of thermal power units and allocating energy storage,but its economic effect is not good,and the application of electric vehicle(EV)provides an effective way for this.Through the EV parking lot equipped with low-power bidirectional interactive charging piles,on the basis of traditional charging services for EV users,it can also provide stable and controllable power to the grid in reverse direction.At the same time,EV parking lot can gain revenue by participating in peak load regulation,frequency modulation,reactive power compensation and other service markets.Therefore,compared with the traditional solution,improving the reliability of power grid through EV parking lot has the advantage of economic efficiency.In order to deeply analyze the potential value of the virtual energy storage system based on EV parking lot in the future distribution network,and effectively analyze the role of EV parking lot in the reliability of distribution network and the operator’s economy,this paper studies and proposes an EV parking lot confidence capacity evaluation framework based on P2G technology,and analyzes its economic benefits,so as to quantify the potential of EV parking lot for power supply adequacy In contribution.Firstly,based on the generation reliability,the credit capacity metrics and economic metrics of EV parking lot are established.By introducing the concept of credit capacity into the apliication scenario of EV parking lot,the credit capacity metrics are established,and based on this,the economic evaluation metrics are established,so as to evaluate the reliability and economy in a unified way.Secondly,considering both technical and human factors,an EV parking available capacity model based on P2G is proposed.Based on the kernel density function,the starting charging time,duration time and charging demand of EV users are modeled,and their probability density functions are obtained.Because the willingness of EV users to participate in P2G project is related to their duration time in parking lot and incentive price,a fuzzy logic based uncertainty model of user behavior is established to objectively reflect the actual impact of EV users’ behavior preferences in P2G project.Then,according to the operation characteristics of EV parking lots,a two-stage optimization model of power interaction between power grid and EV parking lot is proposed.Considering the economic benefits and power purchase cost of parking lot operators participating in the day ahead and real-time markets,a two-stage optimization model is established to maximize the total economic benefits.The actual interactive power between the parking lot and the network is optimized,and the load curve of EV parking lot is obtained.Finally,taking the EV parking lot in Beijing as an example,the effectiveness of the proposed model and method is verified.The simulation results show that the method proposed in this paper can effectively analyze the randomness of user behavior and its potential dependence on incentives,and provide more effective benefit estimation for decision makers.If the electricity price is properly guided,the EV parking lot based on P2G will make an important contribution to the power supply adequacy of the smart distribution network,which has guiding significance for the planning and operation of EV parking lot. |
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