Design Of DC Micro-network Monitoring System With Wireless Charging Of Electric Vehicles

With the depletion of traditional energy sources,the destruction of the ecological environment and the continuous increase of loads,clean energy have become important strategies for the sustainable economic and social development of all countries in the world.Distributed generation and microgrid technology can effectively alleviate the global energy crisis and environmental pollution.Microgrid is a new type of network structure that is composed of a group of distributed power,load,energy storage system and control units.Microgrid can be controlled,protected and managed by itself and and operate in connected with main grid and islanded mode.Islanded DC microgrid is an operation approach of microgrid,which is mainly used in islands and remote mountainous areas.Electric vehicles as accelerating energy transformation and achieving a low-carbon economy have got more and more countries' attention.The electrification of the car is the inevitable trend of future development.With the development of driverless technology,wireless transmission of electric energy to electric vehicles is an effective way to solve the problem of driverless car charging.This thesis mainly studies the related technologies of the islanded DC microgrid monitoring system to ensure the reliable and stable operation of the microgrid system.Firstly,the Maximum Power Point Tracking technology of photovoltaic and wind turbine and the battery charge and discharge control technology are studied.The energy allocation methods of PV arrays,wind turbines and batteries in microgrid are studied,and the capacities of distributed generation(DG)in practical demonstration projects are designed.The energy management required for unattended operation of the system is studied and effective energy management algorithms designed.The overall monitoring system contained hardware and software of the islanded DC microgrid are designed.Analyzed the required functions to ensure the stable operation of the demonstration project and study how the host computer slave computer worked together to achieve the required functions of the system;Secondly,study the real-time communication and control technology between host computer and slave computer.Demonstration project uses the serial communication based on RS-485 port and Ethernet communication.The communication protocols including standard Modbus RTU and standard Modbus TCP/IP are studied to ensure the real-time telemetry and remote control functions of the monitoring system.Using the configuration software create a friendly and interactive man-machine interface.So when real time telemetry and remote control,the collected data can be displayed,historical data can be queried,the current status of each device can be obtained and real-time alarm functions in the corresponding interfaces.Design and create EVs wireless charging mode,charging records and credit card charging billing interface;At the same time,the system's energy management algorithm are embedded in the monitoring system.At last,showing the platform of demonstration project and monitoring system and some achievements are obtained in the experiment.The monitoring system can meet all needs of demonstration project,so it is a good,reliable and effective monitoring system.