Power System Optimal Operation With Large-scale Wind Power And Electric Vehicle Integrated Considering Demand Response

Under the dual background of energy crisis and environmental pollution,wind power and electric vehicles have been developing rapidly.However,wind power is characterized by randomness and volatility.As a result,large scale wind power integration will bring serious challenges to the security and stability of power system.Although electric vehicles can work on both charging mode and discharging mode which can make it possible for electric vehicles to achieve complementary operation with wind power.But its essence is still power load,which is influenced by many factors such as subjective willingness of their owners,weather,road condition and so on.Large-scale electric vehicle integration will increase the uncertainty of power grid operation.In order to cope with the increase of power grid uncertainty caused by large-scale wind power and electric vehicle integration,it is urgent to excavate new flexible resources to enhance the flexible adjustment ability of the power system.As an important part of smart grid architecture,demand response can guide users to adjust electricity behavior in order to respond to the change of the power grid from the load side.Therefore,demad response will provide a new way to enhance the flexible adjustment ability of the power grid.In this paper,the optimal operation of power system including large-scale wind power,electric vehicles and demand response is studied.The research results of this paper can be concluded as follows.In this paper,the charging characteristics of electric vehicles are analyzed from three angles: battery charging characteristics,charging mode and driving characteristics.A charging and discharging model suitable for large-scale electric vehicles integration is established.Meanwhile,based on the response characteristics of demand response,models considering time-of-use pricing and interruptible load is established respectively.Considering the uncertainty of wind power and electric vehicle,probabilistic scenario theory is used to deal with the uncertainty of wind power,the robust theory is applied to deal with the uncertainty of electric vehicle.On this basis,the operation cost,the cost of cutting load,the cost of abandoning wind power and the cost of electric vehicle discharge compensation are introduced into the objective function and a power system economic dispatch model including large-scale wind power and electric vehicles is established to discuss the influence of orderly charging and discharging of electric vehicles to the power system.The example shows that under the background of satisfying the users' demand,orderly charging and discharging of electric vehicles be controlled can improve the economy of the system,improve the capacity of the system and enhance the flexibility of the system.Considering the effect of demand response on the operation of the system,the complementary relationship between demand response and electric vehicles is discussed And an economic dispatch model of power system with large scale wind power and electric vehicle considering demand response is established.Through the coordination and optimization of the operating conditions of the conventional units,the charging and discharging of electric vehicles and demand response,power system can enjoy the best economy.The improved 10 machine system is taken as an example to demonstrate that the demand response can effectively improve the flexibility of the system which verify the validity of the model.