Reliability Assessment Of Distribution Network Considering Electric Vehicle And Microgrid Access

Distribution network power supply reliability is an important basis for power system evaluation of distribution network construction level.With the development of emerging energy utilization technologies-electric vehicles and new grid technologies – micro-grid technology research continues to break through,a large number of electric vehicles and micro-grids are continuously connected to the power distribution system,which makes a huge change in the structure and operation mode of the distribution network.For the distribution network after considering the connection of a variety of new elements,whether the power supply reliability can meet the higher and higher power quality requirements of current power users needs further research.The main research content of this paper is:1.Analysis of the relevant characteristics of micro-grid and electric vehicles.Including the grid structure and operation characteristics of the micro-grid,the characteristics and power calculation models of the distributed power and energy storage equipment in the micro-grid.The driving characteristics and charging and discharging time of different types of electric vehicles are analyzed.Proposing the power interaction strategy,charging and discharging power calculation models of electric vehicles that under centralized management.2.Analysis of the island operation reliability of micro-grid with electric vehicle charging stations.Taking the park micro-grid as the research object,divides the types of electric vehicles in the charging station into two types:private electric vehicles and electric buses.By analyzing the travel time characteristics of different types of electric vehicles,the power interaction strategy and power calculation models between the electric energy storage station and the micro-grid power system are proposed.Dividing the feeder area of the micro-grid with the switch as the boundary,and proposing different fault isolation operation methods.Based on the traditional evaluation indicators,the relevant evaluation indicators for considering the access of electric vehicle charging stations are proposed.3.Analysis of the operating characteristics of the distribution network that electric vehicle charging station and the grid-connected micro-grid are connected.Proposing the power interaction strategy between the distribution network and the connected micro-grid and electric vehicle charging station during normal operation of the distribution network.When a fault occurs in the distribution network,different island regions are formed after the fault is isolated according to the location of the fault point.Analyzing the operating conditions in different island regions and proposing a power interaction strategy among the various components in the region.4.Based on the F4 feeder area of the IEEE distribution system reliability evaluation test system RTBS Bus 6,that with different improved design,as the simulated system,evaluates and analysis of power supply reliability of power grid and power distribution network connected to micro-grid and electric vehicle charging station with the sequential Monte Carlo intelligent algorithm.It is verified that under the proposed operation strategy,the reliability of the power supply of the distribution network after the electric vehicle charging station and the micro-grid are connected is improved.