| As the sustainable development of the China’s economy,the consumption of petroleum energy is growing.Most of the petroleum is consumed in the transportation.At the same time,fuel automobile emission made a large effect on the environment.especially the haze happened frequently in recent years,which brought great inconvenience to people’s life.In order to solve the problems of energy shortage and environmental pollution caused by overmuch fuel cars,the electric vehicle arises at this historic moment.The population of the electric vehicle brings some opportunities and challenges for the construction and development of traditional power system.On the one hand,electric vehicle integrated into the grid through electric power electronic converter which will bring great harmonic pollution to system under improper control and increase the burden of system resulted from the increased load.Electric vehicle integrated into the grid distributed,which will bring the challenges for the scheduling management and operation maintenance of the power system.Electric vehicles.On the other hand,can be used as controlled load and mobile energy storage equipment and provide ancillary services to electric power system,such as frequency modulation,voltage regulator,which can improve the stability of operation.And electric vehicles can promote the renewable energy by reasonable scheduling.This paper will discuss the system inertia and damping loss problem result from the integration of a large number of electric vehicle.Based on the Virtual synchronous machine(Virtual synclronous machine.VSM)technology,desicgning charging/discharging strategy and auxiliary frequency modulation control strategy,make which can electric vehicles can participate in the frequency regulation of system and increase the stability of power system frequency.Firstly,this paper introduced the method of power system frequency regulation combining with the characteristics of the electric vehicle and analyzes the feasibility and economy of electric vehicles involved in pow er system frequency control from the V2G technology,capacity and response speed.Based on VSM technology design of the electric vehicle charging and discharging control strategy.Build the model of two-way charging and discharging machine and dynamic battery in detail,analyze the two-way charge converter AC/DC and DC/DC converter control targets.This paper design the AC/DC and DC/DC control strategy and theoretically analyze the control effect of the proposed strategy.Verify the effect of strategy through the MATLAB/SIMULINK platform,it turns out the control strategy can effectively ease the problem of inertia and damp loss caused by large-scale electric vehicle.Electric vehicle’s two-way charge and discharge function make it possible for electric vehicles participate in frequency modulation of the power system.Considering the power battery life and the user’s demand,the auxiliary frequency regulation control strategy is designed,based on the VSM charging and discharging strategy.Due to the requirements of electric vehicle users and the operation parameters of power battery in the system are different,this paper defines the electric vehicle charging factor a and electric vehicle frequency regulation participation β.The charging factor a can be unified to measure the electric vehicle user’s demand under different operation condition and the electric vehicle frequency regulation participation factor β can be unified measure the degree of frequency regulation participation with electric vehicles under different operation conditions.Based on the above two factors,this paper designed the primary and secondary frequency regulation control strategy based on the fuzzy control algorithm.The model of the frequency regulation is established,on the basis of above model,this paper establish the single area and double-areas of the power system frequency regulation model and verify the accuracy of the model and control strategy through MATLAB/SIMULINK simulation platform. |
PDF Full Text Request