Study On Micro - Grid Economic Dispatching Strategy Considering Electric Vehicle

With the rapid development of global economy, the ever-increasing energy crisis and environmental pollution have become primary issues for the whole world to deal with. The distributed power supply, which is composed of new energy such as renewable energy, can both relieve the electricity shortage and reduce the environmental pollution. Electric vehicles(EVs) can effectively decrease fossil fuel consumption and carbon emission by replacing oil with electricity. Meanwhile, it can be used as power load and distributed power supply. Provided EVs are connected into microgrid system, it can operate as a controllable unit if the microgrid system composed of distributed power supply is interconnected with the main grid. It can relieve power supply pressure of main grid at certain degree. At the same time, it can further control and dispatch charging and discharging operations of EVs effectively.This thesis conducts a deep research on charging and discharging operations of EVs from the aspect of economic analysis and sets up a microgrid system model including EVs. At the same time, it proposes economic dispatching strategies of the system under different operation modes and analyzes by intelligent algorithm. The major research results are as followed:Firstly, it analyzes factors that affect charging operation of EVs and discusses charging and discharging operations of different EVs. Moreover, a large-scale charging and discharging load model of EVs is established based on Monte Carlo simulation. The result shows that EVs being connected into microgrid by V2G mode can effectively achieve control and dispatch of power load.Secondly, it puts forward microgrid system structure including EVs and sets up a mathematical model of the individual distributed power supply. Concerning the combined and independent operation mode of microgrid, this thesis separately proposes different economic operation control strategies. Furthermore, it sets up a multi-target economic dispatching model of microgrid including EVs by comprehensively taking the benefit of environment, grid side and user side into account.Finally, this thesis conducts example analysis on the economic dispatching model of microgrid including EVs by the improved NSGA-â…¡ algorithm. By taking some typical day as example, it discusses dispatching plans of different operation control strategies on microgrid under combined and independent operation modes. The analysis on economic benefit of dispatching plans is conducted as well.