Reliability Assessment Of Distribution Cyber Physical System Considering Electric Vehicles Demand Response

In recent years,with the rapid development of electric vehicle(EV)and widespread application of information and communication technology in power system and transportation system,the integration of power system,transportation system and cyber system is getting deeper.Power system reliability will be affected by uncertainties such as the state of EV when plugged in the grid and cyber system reliability,it is a great challenge to make a scientific and effective reliability assessment of power system by comprehensively considering the impact of cyber system and transportation system.Therefore,this thesis proposes a reliability assessment method for distribution network cyber physical system considering EV demand response.The specific contents are shown as follows:Firstly,a method to calculate the state of EV when plugged in is proposed,considering the reliability of traffic guidance information.This thesis establishes the model of traffic guidance information reliability from the aspect of traffic guidance information generation and release,and studies the route selection of EV user considering the reliability of traffic guidance information,then a method to calculate the state of EV when plugged in is proposed,considering the reliability of traffic guidance information,and the impact of traffic guidance information reliability on state of charge(SOC)and time of EV when plugged in is analyzed.Then,an EV response capability assessment method is proposed,considering EV user’s demand.An EV charging strategy is used to minimize load variance,based on the hierarchical control structure which contains distribution system operator,EV aggregator and EV.This thesis proposes the degree of EV charging demand relaxation,considering EV SOC,departure time and target SOC,then an EV response capability assessment method is proposed,which takes account of the impact of cyber system reliability.Results of case studies on power-transportation coupling system containing RBTS Bus6 and Beijing transportation system show that the proposed EV response capability assessment method is effective,and the impact of cyber system reliability on EV response capability is analyzed.Finally,a reliability assessment method for distribution network cyber physical system(CPS)considering EV demand response is proposed,for the scenario that EV participates in service restoration of distribution network,considering the impact of cyber system reliability on fault processing and EV demand.The power-transportation coupling system containing Beijing transportation system and RBTS BUS6 is established to analyze the impact of cyber system reliability,EV aggregation mode and fault handling mode on distribution network CPS reliability.