Study On The Model And Method Of Power System Unit Commitment Considering The Randomness Of Wind Power

Under the pressure of energy crisis and environmental crisis,electric vehicles have become the main development direction of new energy vehicles.The continuous expansion of the scale of electric vehicles has brought new challenges and opportunities for the safe and stable operation of the power grid.Electric vehicles can be connected to the power grid either as a controlled load or as a mobile energy storage unit.Through a reasonable control strategy,electric vehicles can effectively assist the stable operation of the power system.Therefore,on the basis of fully considering the operating characteristics of electric vehicles,the control strategy of electric vehicles participating in grid auxiliary services will be discussed,which can improve the stable operation level of the grid.The characteristics of fast response frequency of electric vehicles can make it well fit the needs of system frequency regulation.How to use the energy storage characteristics of electric vehicles to suppress system frequency fluctuations and improve the stability of power grid operation has become a new research hotspot.With this as a starting point,the following studies have been carried out in this paper.Firstly,this article establishes a system frequency modulation model with an electric vehicle.Referring to the traditional power system frequency modulation model,and based on this,increase the electric vehicle energy storage model and establish a system frequency modulation model with electric vehicles.Matlab/simulink platform then simulates the example and validates the correctness of the simulation platform through step load and shock load.According to the simulation results,the electric vehicle as a mobile energy storage module performs frequency modulation of the power grid,which can increase the frequency stability of the system and reduce the backup capacity of the conventional unit for frequency modulation.Secondly,because electric vehicles have the basic characteristics of vehicles,in order to make simulation scenarios more realistic,the model of electric vehicles participating in system frequency modulation must reflect the changing characteristics of the number of vehicles.This article analyzes the characteristics of electric vehicles,and uses Monte Carlo method to simulate the dynamic changes of the number of electric vehicles according to certain statistical rules.It also increases certain energy constraints and power constraints,and establishes frequency modulation control that takes into account changes in the number of electric vehicles.model.Then simulations were performed on the matlab/simulink platform to observe changes in the number of electric vehicles and changes in energy storage capacity.Taking into account changes in the number of electric vehicles and user travel requirements,the simulation scenario is more in line with reality,and has certain reference value for the establishment of an actual control system.Finally,a control strategy based on the charging demand of the electric private car users is proposed and used on the frequency modulation model reflecting the change characteristics of the number of electric cars.Modeling and simulation in MATLAB,observing the changes of the state of charge of the electric private car,the simulation results show that the control strategy can gradually increase the state of charge of the electric car in order to meet the charging requirements of the user while suppressing the frequency fluctuation of the system.