Research On Key Issues Of Electric Vehicle Power Supply System Based On Wind-solar Hybrid Microgrid

The development of wind-solar complementary power generation and wireless charging technology makes it possible for electric vehicles to provide green power supply and battery life.Which is very suitable for the application of driving electric vehicles charging on expressway.That can effectively solve the problem of short range in electric vehicles and be use widely.In this thesis,the main directions of research and development are the microgrid power supply design and wireless charging technology,That mainly involved in the field of power electronics and automatic control,which are the necessary means to improve the charging speed and efficiency of electric vehicles,and the key contents of the modern electric vehicles charging technology research.Based on the Natural Science Foundation of Liaoning Province,taking electric vehicle charging system as the research object,this thes is has studied its key issaes comprehensively and deeply mainly including the following aspects:(1)Aiming at the problems of capacity calculation and planning of electric vehicle charging stations for traffic behavior of the expressway network,the M/M/S mathematical model of expressway network is established and the queuing model of the M/M/2/N expressway network is optimized on basis of it,meanwhile the space and road network dispatching energy storage variables are introduced.Based on the expressway network data,the optimal solution of the electric vehicles charging station planning in the expressway network is calculated by VIKOR,which can solve the energy distribution problems of electric vehicle charging station,and the effectiveness of the capacity calculation and planning of electric vehicle charging station can be verified by the expressway network examples.(2)In view of the problems that the ordinary power grid cannot be full covered remotely,this thesis analyzes the resources of wind power generation and photovoltaic power generation based on the spatial and temporal characteristics of wind-solar complementary power generation,and an improved method to calculate the generation capacity of wind-solar complementary system is put forward.At the same time,the power generation system of wind-solar complementary electric vehicle charging station is designed on the premise of fully consideration of practical engineering application.The simulation and experiment platform of wind-solar hybrid power generation system is built and the distributions of wind-solar complementary power generation are simulated and studied experimentally.(3)In consideration of the problem of high frequency resonance in high power wireless charging system,a novel wireless charging system based on expressway network is proposed,which can charge the electric vehicle in real time.In this thesis,the structure and principle of the system are introduced in details and the structures of transmitter and receiver,coil distribution,and power transmission system are innovatively designed.At the same time,the power transmission voltage stabilization control strategy is presented,the output voltage characteristics of the novel wireless charging system.In addition,an experimental platform for power transmission of the novel wireless charging system is built and studied,And the detailed experimental re salts show the effectiveness and feasibility of the novel wireless charging system and its power transmission stabilized voltage control strategy.(4)In allusion to the matching characteristics of wind-solar complementary microgrid,a wind-solar complementary electric vehicle wireless power supply system is developed and experimentally tested.The wireless charging frequency drive circuit,detection circuit and soft switching circuit are all be focused on.The scheme,implementation process of electric vehicle charging program have been designed.And the full bridge DC/DC converter all has been optimized the upper PC control program based on the MCGS,which can ensure the operation reliability of the electric vehicle charging of driving in the experiments.A 20 kW prototype of wireless charging system has been studied.The correctness,feasibility and validity of the theoretical analysis by the expetiments of wind-solar complementary power generation charcteristics,energy storafe operation,load teit,driving charging which can provide an important theoretical references to the design analysis of the modern high-power electric vehicle wireless charging stations.