| In recent years,due to the continuous reduction of energy resources,climate change around the world,and environmental problems have gradually attracted the attention of all countries in the world.One of the root causes of greater harm to the ecological environment is the greenhouse gas emissions caused by the use of non renewable energy,such as automobile exhaust.In this development situation,in addition to the government’s support for electric vehicles and the strengthening of people’s awareness of environmental protection,the number of electric vehicles is growing,and the demand for electric vehicle charging piles is also growing.However,large-scale charging piles connected to the power grid will not only threaten the safe operation of the power grid,but also increase the peak valley difference of power consumption.Therefore,facing the problem of not only meeting the charging demand of electric vehicles,but also realizing the safe operation of the power grid,this paper has made some improvements on the basis of the research on the traditional charging pile,and proposed the energy storage charging pile.Compared with the traditional charging pile,the energy storage charging pile proposed in this paper mainly plays the following roles: charging the electric vehicle and the energy storage battery pack through the grid when the power consumption is low;In the peak period of power consumption,the use of energy storage battery pack has two effects on the charging of electric vehicles.In this paper,the feasibility of the proposed energy storage charging pile is analyzed in detail.In order to realize the charging and discharging function of the energy storage battery pack,the bidirectional DC/DC converter is used in this paper,and the research status of the high gain bidirectional DC/DC converter is described.The parameters and the model of the battery pack are selected for the charging pile,and the overall framework of the energy storage charging pile is designed according to the proposed requirements,and the role of each part of the framework is described in detail.The basic topology of bidirectional DC/DC converter is selected and improved.The working principle and performance of the improved topology are analyzed,and the main parameters are selected.The working efficiency of the improved topology is compared with that of the traditional bidirectional Buck/Boost converter.The state space average modeling method is used to model and analyze the bidirectional DC/DC converter,and the required transfer function is obtained.The control strategy of the converter in the voltage rise and drop mode is designed and its stability is verified.Finally,through Matlab/Simulink software,the simulation model of the charging pile is built,and the simulation results of each part in the simulation are analyzed.Finally,the simulation results show that the bi-directional DC/DC converter can achieve the bi-directional flow of power and maintain the constant DC bus voltage.When switch K1 is disconnected and the electric vehicle is charged by the energy storage battery pack,the voltage of the electric vehicle will fluctuate slightly,but it will return to normal soon.When the energy storage battery pack is suddenly disconnected from the power grid,it can quickly enter the discharge state to charge the electric vehicle.Figure [59] Table [7] Reference [67]... |
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