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The Decentralized Autonomous Distribution Network Voltage Regulation Strategy Based On Reactive Power Compensation With Electric Vehicles

Posted on:2018-04-25Degree:MasterType:Thesis
Country:ChinaCandidate:Y HuFull Text:PDF
GTID:2322330512995212Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the higher consciousness of the energy depletion and environmental problems,the electric vehicles(EVs)become more and more popular.As a new type of the load,large scale EV charging load will increase the degree of the deviation between node voltage and nominal voltage in a local distribution network,and the voltage deviation which caused by the charging load is random on time and place.The above problems can be solved through traditional reactive power compensation method,but the economy is bad.The EV-chargers have the reactive power compensation function,so the EV-chargers can be used to regulate the node voltage of the distribution network which integrates with large scale EVs by compensating the reactive power.The operating power factors of the chargers can be regulated effectively through some strategies which aim at implementing node voltage regulation at the same time of changing,and ensuring the safety and stability of the node voltage as well as the economy of the distribution network.This paper researches on the decentralized autonomous distribution network voltage regulation strategy based on reactive power compensation with electric vehicles.The main work is as follows:(1)Firstly,the travel behavior characteristic in a working area of a first-tier city in China is analyzed.Then the Monte Carlo method is used to do a large number of random sampling of factors which influence the unit power factor disordered charging load.After that,the unit power factor disordered EV charging behavior is simulated,and the large scale unit power factor disordered EV charging load is calculated.Then the impact of the large scale disordered EV charging behavior on the distribution network is analyzed.Subsequently,the controllability of the EVs is analyzed based on the ability to participate in distribution network control.(2)The principle of the node voltage regulation by using EV-chargers is analyzed,and then the operating characteristic of the chargers is analyzed,specifically,the monotonicity characteristic of the node voltage-operating power factors in the inductive mode and capacitive mode of the chargers.(3)The controllable range of operating power factors of the chargers is calculated based on the operating characteristic of the chargers and the owners' charging demand and parking demand.Then,the decentralized autonomous node voltage regulation model is proposed which considers all operating power factors of chargers as variables and considers the following conditions as the optimization objective:the deviation between node voltage and nominal voltage is minimum,the variance of the node voltage from current time to all time before is minimum,the SOC charged in at unit duration is maximum.Then the immune optimization algorithm is used to get the values of variables in the node voltage regulation model.(4)Aiming at the problem of charging time extension when the EV-owners participate in reactive power compensation,a kind of incentive strategy to the EV-owners is proposed based on the voltage contribution quantification.The EV-owners' enthusiasm of participation in reactive power compensation can be boosted through the settlement of incentives.(5)Finally,the impact of the unit power factor disordered EV charging behavior on the distribution network is simulated.The performance and rationality of the node voltage regulation strategy and incentive strategy in this paper can be validated through the simulation in a real environment of distribution network.After that,the MATLAB GUI is used to design the information management system for reactive power compensation based on the EVs.The users' information and voltage regulation information through reactive power compensation can be managed.
Keywords/Search Tags:electric vehicle, operating power factor of charger, reactive power compensation, decentralized autonomous voltage regulation model, operating characteristic of the charger with variable operating power factor, travel behavior characteristic
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