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Study On Primary Frequency Regulation Control Of Power System Considering Mobile Energy Storage By Electric Vehicles

Posted on:2018-02-03Degree:MasterType:Thesis
Country:ChinaCandidate:T N LiFull Text:PDF
GTID:2322330533958773Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the growing energy crisis and the impact of environmental pollution on human society,more and more countries realize that the electric vehicle industry is one of the best solutions to these two problems.However,all things have two sides.On the one hand,when the quantity of electric vehicles expands to a certain extent,the scale of load will threaten the stable operation of power system,which needs reasonable planning for its development;on the other hand,the electric vehicle has flexible storage characteristics,which is able to provide help for the development and application of smart grid.Because the electric vehicle has the ability to store electric energy,and can respond quickly to the frequency change of the system,so it is suitable for the frequency regulation.When the system frequency is high,the electric vehicles are used as electric load,consuming electricity in order to make the frequency down.When the system frequency is low,the electric vehicles are used as the energy storage unit,feeding back the electric energy to the power grid in order to make the frequency up.In addition,as a means of transport,the electricity amount of battery must consider the driving needs of the owners.When the electric vehicles provide the frequency regulation service for the power system,owners also hope to obtain certain economic benefits,which makes the electricity price as an adjustment means for the frequency regulation strategy and the user demand.Therefore,in this paper,the electric vehicles are involved in the primary frequency regulation(PFR)of power system for designing the frequency regulation control method to study on.Detailed contents are arranged as follows:First of all,the causes of frequency fluctuations and frequency regulation principles(including PFR,SFR and TFR),etc.are introduced.Based on this,the simulation model of the cross-regional power system needed for research is established,which contains a power plant unit,a cross-regional system tie line unit,a load fluctuation unit and a wind power generation unit.Being aimed at the electric vehicles for the PFR,an electric vehicle simulation model based on battery charge state(SOC)is designed.Based on the cross-regional power system model,the simulation platform of power system frequency regulation is built,which provides a simulation environment for the PFR control method research.Secondly,making the electric vehicles charging form and management mode as the research foundation,the feasibility of the frequency regulation service provided by electric vehicles is analyzed from three aspects respectively: the mode of participation,the time and the capacity and the frequency regulation speed.Thirdly,by analyzing the principle of PFR with electric vehicles,the control framework of the electric vehicles for participating in the PFR of power system is established,and decentralized PFR control method considering real-time electricity price factor based on power stabilization control method and expected charging control method is proposed.In the proposed control framework,according to the level of real-time electricity price,the V2 G control unit of each electric vehicle's charging device can take corresponding frequency regulation service based on the available battery capacity and other information.At the same time,the battery capacity is calculated in real time and the expected charge / discharge power is adjusted to ensure that the user's travel is not delayed due to the participation in the system frequency regulation.Finally,using MATLAB/Simulink simulation software,according to Monte Carlo method,simulating battery state of charge and the users' travel,electric vehicles participating in power system PFR is simulated and analyzed with frequency regulation gain calculation.The simulation results show that the proposed method can not only effectively suppress the frequency fluctuation of power system,but also meet the needs of users.
Keywords/Search Tags:electric vehicle, primary frequency regulation, frequency regulation gain, user demand, decentralized control
PDF Full Text Request
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