Optimal Dispatch Of AC/DC Hybrid Microgrid Including Electric Vehicles

AC/DC hybrid microgrids combine the advantages of AC microgrids and DC microgrids,This is an inevitable trend for the development of microgrids in the future.Since electric vehicles are clean and efficient,the promotion of electric vehicles is an important way to promote low-carbon traffic.Through the interaction and coupling of electric vehicles and renewable energy,it constructs the integrated system under the AC/DC microgrid environment,which can not only reduce the configuration of microgrid energy storage units,but also reduce the impact of direct integration of electric vehicles into the power grid.However,with the access of electric vehicles,the optimized operating conditions of AC/DC hybrid microgrids are more complicated.There is an urgent need to study the optimal scheduling method of AC/ DC hybrid microgrids when electric vehicles are connected.In this paper,considering the charging load and other load response characteristics of electric vehicles in the microgrid under the time-of-use electricity price,the structure and scheduling strategy of the hybrid AC/DC microgrid with electric vehicles in the grid-connected and islanded states are proposed,and the microgrid is optimized for operation.In the first,The article elaborates the research background and research status of the subject,Then introduced the basic structure of the AC/DC hybrid microgrid containing electric vehicles,combed the micro-source model in the AC/DC microgrid and the factors affecting the charging load of electric vehicles.Finally,based on Monte Carlo simulation,an orderly charging model for electric private cars and electric taxis was established under time-of-use electricity prices.With reference to the concept of responsiveness of electric private cars and the division of load characteristics by large power grids,the response mode of fast charging stations for electric taxis under AC / DC microgrid environment is proposed.Based on this,the optimal dispatching models of AC/DC microgrids containing electric vehicles in grid-connected mode and island mode are established respectively.The former aims at minimizing the daily operating cost of the microgrid,considers the constraints of power balance,upper and lower limits of the micro-source output,and solves the model by improved particle swarm optimization.The sensitivity of the model is analyzed from the response of the electric private car and the response mode of the fast charging station of the electric taxi.It proves the economy of orderly charging of electric vehicles under grid-connected AC / DC microgrid.The latter implements demand-side management of all loads including island-type AC / DC microgrids,including electric vehicle loads,classifies loads according to load response characteristics under time-sharing electricity prices and establishes their response models.Subsequently,a scheduling model was established with the goal of maximizing the daily profit of the microgrid.The comparison of the three scenarios showed that the implementation of time-sharing electricity prices for all loads in the microgrid can further increase the revenue of the microgrid,reduce the cost of electricity purchases by users,and achieve a win-win effect.