Hybrid AC/DC Microgrid Optimization Planning

The environmental and energy crisis is increasingly serious,and the use of clean energy will be an inevitable trend in the future.Distributed power and electric vehicles are used more and more commonly.The microgrid contains various distributed energy sources,energy storage,power electronic control equipment and loads,which is a good carrier for clean energy.However,there are many disadvantages of the AC microgrids.As technology advances,hybrid AC/DC microgrids come into being,which facilitates distributed power and load access.It reduces commutation equipments and improves commutation efficiency.The disorderly charging of electric vehicles has impacted the grid while increasing the user's charging cost.we need to study the charging of electric vehicles in planned.This article firstly introduced the research status of microgrids and electric vehicles.Then this paper summarized the characteristics and principles of power planning and Introduced the mixed integer solution method and CPLEX optimization software.Taking the hybrid AC/DC microgrid as the research object,analyzed the structure of hybrid AC-DC microgrids.Studied the voltage level sequence suitable for hybrid AC-DC microgrid considering load access,distributed power access,and power equipment manufacturing.Secondly,this paper studied the optimal configuration of hybrid AC/DC microgrids.Introduced the mathematical model of distributed power supply.Taking into account the inverter configuration,stochastic failure of equipment,operating state of microgrid,this paper established a optimal planning model that targets the sum of installation costs,operating costs,and reliability costs in Hybrid AC/DC microgrid system with wind turbine generators,photovoltaic generation and energy storage battery.Optimal planning had been carried out under different dc load ratio and made a comparison to AC microgrid.Finally,this paper studied the optimal configuration of hybrid AC/DC microgrid with the charging load of electric vehicles.Discussed the disordered charging model of electric vehicles and the expansion model of the micro grid.Taking into account the comprehensive constraints and the orderly charging,this paper established a multi-objective optimal planning model,in order to reduce the cost of allocation and the load fluctuation.The case researched the effects on optimal allocation of electric vehicles' orderly charging and the interaction between new hybrid AC/DC microgrid and quondam microgrid.