Decentralized Scheduling Strategies Of Electric Vehicles Participating In Voltage Regulation In Distributed Power Grid

With the increasing pressure from energy shortages and environmental pollution,more and more attention has been paid to the electric vehicle(EV).But with a large number of EVs connected to the power grid,if not adjusted,will have an adverse impact on the stability and security of the power grid.However,EVs have the advantages of long parking time,good energy storage characteristics,and high response speed.So,they are expected to provide auxiliary services such as voltage regulation for the power grid.At present,scholars have conducted a lot of research on how to use EVs to provide voltage regulation services for the power grid.However,there are still significant challenges to meet the requirements of grid voltage stability,EV charging needs,and the economic benefits of each EV user.In order to solve the above problem,the optimal scheduling strategy of distributed EVs participating in power grid voltage regulation is studied in this paper.More details are as follows:Firstly,considering the situation of EVs distributed plugged in house for charging at night,this paper proposes a residential power grid structure with EVs plugged in.In addition,based on the three kinds of existing scheduling framework of ordered charging and discharging of EVs,this paper proposes scheduling frameworks for EVs to participate in voltage regulation in the distributed power grid including a single residential area or multiple residential areas,respectively.These scheduling frameworks can reduce the computational burden on the system dispatch system and reduce the requirement on the communication system.Secondly,based on the above-mentioned system structure and scheduling framework,the scheduling strategy of EVs participating in voltage regulation is designed for the distribution power grid of a single residential area.This scheduling strategy is composed of a two-level optimized scheduling of the local control unit and the regional control center.The local control unit aims to maintain the interests of EVs,and on the basis of satisfying the charging constraints of EVs,it obtains the minimum charging cost of the EV and determines the acceptable charging cost range for the user.The regional control center aims at realizing the voltage stabilization in the area,and on the basis of satisfying the substation operating capacity limit and the acceptable charging cost range of each user,it minimizes the active power loss and the voltage deviation.Thirdly,based on the above-mentioned scheduling strategy,an EV scheduling strategy based on multiple residential areas distribution power grid is designed.The scheduling strategy consists of a three-level optimized scheduling of the local control unit,the regional control center,and the system dispatch center.In addition,the randomness of EV users’ travel behavior and the impact of EV charging on battery consumption are considered.The system dispatching center aims at ensuring the normal operation of the entire system,it checks the power consumption plans of the regional control centers and guides the charging plan of EVs through electricity price adjustment.Simulation and verification are performed on the MATLAB platform and the results are analyzed.The simulation results show that the proposed scheduling strategies can both satisfy the economic interests of each EV user and achieve the effective adjustment of the grid voltage...