Research On Optimal Regulation For The Interaction Of Wide Area Source And Load With Large-scale Electric Vehicles

Recently,electric vehicles(EVs)provide a new way for decarbonizing the transportion system.However,a large scale of EVs will bring the difficulty as well as the oppprtunity for the optimal regulation of power system.On the one hand,a new peak load will appear with the charing of EVs,and the stable operation of the power system is influenced seriously.On the other hand,the EVs are able to serve as the battery energy storage system or the distributed generation for participating in the operation of power system.The optimal regulation for the interaction of source and load with large scale electric vehicles is studied intensively in this research.The main works of this research are shown as follows:(1)Based on the(Vehicle-to-Grid)V2G model,an efficient power plant model of EVs(E-EPP)is developed to evaluate the available capacity considering the travelling behaviors.The available capacity of the active power and the reactive power from the aggregated EVs throughout a day are obtained.(2)When the static voltage stability margin is decreased to the threshold value,a preventive control strategy for static voltage stability based on the E-EPP is proposed.By disconnecting the EV charging load and even discharging the stored EV battery energy back to power grid,the static voltage stability of the power system is increased correspondingly.(3)The active power regulation of the E-EPP is developed to offset the power variations caused the penetration of large scale wind farms.The output variation of the traditional generators for following the wind power fluctituation is decreased to some degree.This will consequentially promote large scale renewables and distributed resources integrating into the power system for the low-carbon economy.(4)Based on the reactive power from the EV chargers,a volt-var optimal control(VVOC)strategy for the wind power system is proposed with the coordinated control of the capacitor banks(CBs)and the on-load tap changers(OLTCs).And the operating economy and the voltage stability of the power system is further increased with the strategy.(5)considering the travelling demand and the price compensation for EV users,the available capacity of the E-EPP is evaluated with the response mechanism.The response mechanism for the EV users is preliminarily investigated under the electricity market.