Research On Control Strategy Of Bi-directional AC/DC Converter In Hybrid Microgrid

With the shortage of global energy resources,the rise of energy prices and global warming are increasingly serious,the microgrid based on the technology of distributed generation has been rapidly developed.In the microgrid,the bi-directional AC/DC converter is the key converter for realizing the power transmission,management,storage and on/off-grid.It is the basis for constructing the microgrid.This paper first describes the research status of Bi-directional AC/DC converter from two aspects:circuit topology and control mode,then analyzes and compares the advantages and disadvantages of common design.Combining specific usage scenarios and project requirements,the basic topology structure was determined,and mathematical models in different coordinate systems were established based on the topology circuit diagrams.At the same time,the application of LCL filtering and space vector control technology(SVPWM)in this design is introduced.Then analyzes the control state and target of the bidirectional AC/DC converter for different working modes of the microgrid,designs the corresponding control system,and uses matlab simulation software to simulate and analyze the dynamic performance and steady-state performance of the control system.Finally,an experimental prototype based on TMS320F28035 was built.The experimental results verify the effectiveness of the control system.