Research On Bidirectional AC-DC Converter Based On Energy Feedback Grid-connected System

In recent years,under the general situation of the continuous development of the national economy,the level of science and technology and other industries has become higher and higher.The relevant government policies strongly support the development of electric vehicles.There is a rapid development of research on electric vehicles.From the current development Judging from the situation,electric vehicles will definitely become the main means of transportation in the future.Under the guidance of many favorable policies of the government,a large number of domestic battery manufacturers have begun to study batteries for electric vehicles.From the current stage of development,battery modules are a very important part of electric vehicles,and also a key technical problem that can have a significant impact on the future development of the electric vehicle industry.With the increasing requirements for power batteries,the charge and discharge performance of power batteries has also been paid more and more attention,and the research on DC/DC power supplies for power battery charge and discharge modules has also been more and more in-depth in the entire industry.This article focuses on the study of bidirectional AC/DC converters in energy-feedback grid-connected systems.The purpose of the research is to hope that through this study,a bidirectional AC/DC converter can be designed.This converter can be well applied to the battery components of new energy vehicles,and can fully realize the composition of the battery components,thus It can realize the grid connection of energy feedback.The system can realize the charging and discharging functions of new energy vehicle battery components simultaneously,and can realize energy feedback and grid connection;at the same time,it can greatly improve the charging and discharging efficiency of battery components and can greatly reduce the unnecessary electrical energy.Consume.This article analyzes the current research and development status of AC/DC converters at home and abroad by combining the contributions made by the domestic and foreign R&D teams in the bidirectional AC/DC converters and the breakthrough research progress achieved.Theoretical data and research results,the development of bidirectional AC/DC converters based on energy feedback grid-connected systems.Starting from the basic structure of the AC/DC converter,this article introduces the functions of different types of PWM rectifiers in detail.By comparing and analyzing the working principles of PWM rectifiers,a single-phase voltage PWM rectifier is designed by mathematical modeling.Realize the bidirectional AC/DC charging rectification process and discharge inverter grid connection process studied in this paper.Then this paper discusses and studies the different types of DC/DC converter topologies used in practical applications.By comparing and analyzing the advantages and disadvantages and topologies of different types of DC/DC converters,by using isolated DC/DC converters.The performance of the converter is compared with the non-isolated DC/DC converter.Finally,a mathematical model is used to determine and design an isolated DC/DC converter-push-pull full-bridge topology.Finally,through the experimental demonstration in this paper,the idea of using a DSP digital controller to control the PWM rectifier and push-pull full-bridge topology structure is determined.This combination of micro-components can fully realize the battery charging and discharging functions and energy feedback grid connection Function,AC/DC conversion can be achieved during the charging of the power battery assembly,and DC/AC conversion can be achieved during the discharging of the power battery assembly.Finally,based on the above theoretical design and mathematical modeling,this article studies the control strategy of the bidirectional AC/DC converter under grid-connected conditions.On the basis of theoretical analysis and mathematical modeling verification,through the experiments built by the author of this article.The platform conducted a large number of experimental verifications on the designed bidirectional AC/DC converter,and determined the main power parameters and models of the converter by referring to the experimental results.Through the test of the experimental prototype designed by ourselves,we obtained the ideal experimental waveform and test data through the measurement.These experimental results verified the rationality and design of the bidirectional AC/DC converter of the energy feedback grid-connected system constructed in this paper feasibility.