Coordinated Optimization Control Strategy Of DC Microgrid With Integrated Electric Vehicle

The new energy and electric vehicle industries are both strategic emerging industries in China,and they are also the core content to promote the energy revolution.At present,the popularization and promotion of wind power,photovoltaic power generation,and electric vehicles in China occupy the first place in the world.DC microgrids are the main form of consuming distributed power.The integration of large-scale electric vehicles and various distributed power sources in DC microgrids will Contribute to the sustainable development of energy.Driven by technological advancement,the cost of photovoltaic and wind power continues to decline,and the abandonment rate and the abandonment rate are significantly improved.EVs are integrated into a DC microgrid that contains many renewable energy sources,Is of far-reaching significance for the realization of the national energy Internet layout!Based on the DC microgrid as the basic model,this paper integrates electric vehicles into the DC microgrid,and researches on the related technologies of electric vehicles participating in the DC microgrid.Firstly,the topology and control strategy of the DC microgrid are described,and then the related technologies of electric vehicles connected to the microgrid and the status quo at home and abroad are sorted out.The distributed power sources such as wind power generation,photovoltaic power generation,diesel generators,etc.are analyzed.System model and output characteristics.Secondly,it analyzes the current challenges in connecting electric vehicles to the DC microgrid,and summarizes them from the perspectives of control strategies,optimized scheduling,and overall operation.As a device to realize the interaction between electric vehicles and microgrids—two-way full-bridge DC / Compared with the introduction of a virtual synchronous generator in the AC microgrid to increase the inertia of the DC converter,a control strategy for the virtual inertia of a dual active full-bridge DC-DC converter is proposed.The system is improved by adding a first-order filter The inertial power reference enables the dual active full-bridge DC-DC converter to achieve optimal performance.Next,the charge and discharge power characteristics of electric vehicles are analyzed.In order to make full use of distributed energy generation,combined with the charge and discharge characteristics of electric vehicles,and to maintain the power balance in the system,a DC microgrid control strategy based on the charge and discharge power characteristics of electric vehicles is proposed.This control strategy can realize that when the state of charge of the electric vehicle is higher than a certain threshold,it can participate in the microgrid power regulation,balance the microgrid load,reduce the peak load,and improve the economic performance of the system.Finally,a simulation model was built using Matlab / Simulink.The results verify that the dual-active full-bridge DC-DC converter's extended phase shifting virtual inertia control strategy can significantly reduce the system bus voltage fluctuations,thereby enabling the dual-active full-bridge DC-DC conversion.The device achieves the best performance,and the layered control method can fully and effectively mobilize the mobile energy storage characteristics of the electric vehicle,so that the electric vehicle is better integrated into a DC microgrid that contains a large number of renewable energy sources.The power supply quality of the power grid effectively suppresses the fluctuation of the DC bus voltage.