Research On Micro-Grid Harmonic Suppression Strategy With Electric Vehicles Charging

Micro-grid and electric vehicles are widely concerned with the advantages of “environmental protection and low pollution”.In recent years,the “light-storage-charge” integrated charging station has closely linked the micro-grid to electric vehicles.Distributed energy and various power electronic devices in the micro-grid will generate harmonics during operation.The charging of electric vehicles to the micro-grid will increase the harmonics of the micro-grid and affect the stable operation of the system.Therefore,it is of great significance to detect and accurately suppress the harmonics of the micro-grid system containing electric vehicle charging.The thesis firstly describes the research status of micro-grid,electric vehicles,micro-grid with electric vehicles and harmonic control of micro-grid.The basic structure of the micro-grid system with electric vehicles charging is analyzed.The research is carried out from four parts: wind power generation system,photovoltaic power generation system,energy storage system and electric vehicles.Secondly,the harmonic source of the micro-grid system with electric vehicles charging is studied.The harmonic detection method is based on the instantaneous reactive power detection method.The micro-grid grid-connected system with electric vehicles charging is simulated in the simulation environment.The simulation results show that the micro-grid system with electric vehicles charging generates relatively serious harmonics in the grid-connected state,and harmonic suppression is needed.For the micro-grid system harmonics containing electric vehicles charging,this thesis studies the micro-grid energy storage system and active power filter.According to the similarity between the two main circuit structures,it is proposed to combine the micro-grid energy storage system with the active power filter for harmonic suppression.Finally,the simulation is performed under the simulation software.The simulation results show that after using the above harmonic suppression method,the harmonics of the micro-grid with electric vehicle charging are effectively suppressed,the active and reactive powers are compensated,and the current distortion rate meets the grid connection requirements,which verifies the feasibility of the the harmonic suppression method.Figures [59] Tables [8] References [60]...