Optimal Sizing Of AC-DC Hybrid Microgrid And Energy Management Of Multi-Microgrids

With the growing pressure of the energy crsis and deterioration of global environmental problems,microgrid is widely concerned about and applied as an efficient way to use the renewable energy.Nowadays,due to the increase of dc/ac hybrid loads in microgrids and the inner-regional microgrid interconnection increased.The study of optimal sizing of AC/DC hybrid microgrids and the energy management of the multi-microgrids system is of great theoretical and engineering value.In this paper,we firstly study the optimal sizing model of AC/DC hybrid microgrid.,propose a control strategy of grid-connected AC/DC hybrid microgrid.The results under different DC loads ratio is obtained by non-dominated sorting genetic algorithm(NSGA-II).The comparision between AC microgrid and AC-DC hybrid microgrid verifies the effectiveness and feasibility of the proposed model.Secondly,the optimal sizing model of AC/DC hybrid microgrid considering the uncertainties and demand response is proposed for the intermittent and randomness of wind and solar resources.The model is solved by the bi-level optimization method,the out layer adopts NSGA-II algorithm to explore the capacity of microgrid.The inner layer the operation costs were optimized by the mixed integer linear programming in every scheduling cycle(24 hours).Then,the optimized microgrid result is captured considering both the capacity configuration and operation costs.The influence of uncertainty factors and demand response on capacity planning are analyzed.by the simulation.Finally,as for multi-microgrid system energy management method,The aim of the method is to minimize the operation cost of the whole multi-microgrids system,which taking the the uncertainty of the wind and solar resources and the fluctuation of the loads into account.A multi-layer robust optimization model model is established.C&CG algorithm is used to solve the uncertainty problem of the model,and the multi-microgrids cooperative game is adopted to achieve the goal of the lowest cost of the multi-microgrids system.Through the case study,the robustness of the multi-microgrid system is analyzed,the validity of the cooperative game is verified.