Research On Dynamic Characteristics Of Wind/Photovoltaic/Energy Storage And Electric Vehicle Integration Micro-grid

Micro-grid and electric vehicles are important parts of Energy Internet,under the Energy Internet,micro-grid and electric vehicles can be vigorously developed and highly valued.The demand of traffic from modern residents caused large quantity of cars,but the overly use of fossil fuel vehicles will cause pollution and damage to environment.Electric vehicles will be rapid developed,electric vehicles charging problems will bring more and more attention.Reasonable the combination of micro-grid and electric vehicles,which can play a role to solve environmental protection problems and can reduce the micro-grid construction and investment costs,play electric vehicles can reduce power fluctuations.Electric vehicles access to micro-grid at the same time will bring lots of problems as: electric vehicles charging disorder,coordination and scheduling is very difficult to control,a number of energy source power is not easy to control in micro-grid and so the electric vehicles accessed etc.This paper mainly studied transient and steady state of the system of micro-grid and electric vehicle,the voltage index of power quality in steady state and the switching process in transient.In this paper,the dynamic characteristics of electric vehicle access to micro-grid and the control strategy of flexible and smooth charging of electric vehicle have been studied in isolated mode of micro-grid.This paper has finished these main works: Firstly,a typical model of wind,photovoltaic,storage and electric vehicle charging device is established on PSCAD/EMTDC software simulation platform.Secondly,establish the integrated micro-grid with established models and test the waveform and harmonic content of voltage,power and frequency under grid-connected and isolated operation modes.Finally,debug all the models of the integration,establish integrated system of wind,photovoltaic,storage and electric vehicle and research on smooth switching and power quality of micro-grid with electric vehicle.Adjust the micro-grid inverter voltage ring in the PI controller to achieve micro-grid on the electric vehicle smooth and flexible charging to satisfy micro-grid operation power quality constrained by the conditions of micro-grid and electric vehicle capacity matching and use PSCAD software to simulate the results of simulation.