Research On Optimal Operation Of Hybrid AC/DC Microgrid Considering Source-Network-Load-Storage Coordination

Hybrid AC/DC microgrid integrates the advantages of AC microgrid and DC microgrid.It can meet the requirements of AC load and DC load simultaneously and reduces the number of power electronic equipments while distributed generations are connected to hybrid AC/DC microgrid.As a result,the quality of power supply is improved.At the same time,hybrid AC/DC microgrid can provide a flexible power supply mode,which is conducive to the large-scale development and utilization of distributed generations,and becomes one of the main development trends of microgrid.With the increasing penetration of renewable energy,such as wind turbine and photovoltaics,in hybrid AC/DC microgrid,how to promote the consumption of renewable energy is a difficult problem in the optimal operation of hybrid AC/DC microgrid.Considering the promotion of source-network-load-storage coordination on renewable energy consumption and the economic operation of hybrid AC/DC microgrid,an optimal operation method of hybrid AC/DC microgrid considering source-network-load-storage coordination is proposed in this paper.Firstly,the research background and significance of this topic are elaborated,and the development trends of microgrid at home and abroad and the research status of microgrid optimization operation are summarized.Secondly,the basic concepts of hybrid AC/DC microgrid are introduced,and the strategies of source-network-load-storage coordination are proposed.The load adjustment method and distributed generation dispatching plan are formulated from four aspects: load side,source side,energy storage device side and network side.Then,considering various cost functions and constraints,a mathematical model for optimal operation of hybrid AC/DC microgrid is established.In order to improve the solving accuracy of the established model,the memetic algorithm is innovatively used to solve the optimal operation problem of hybrid AC/DC microgrid.By comparing with particle swarm optimization,it is proved that the memetic algorithm has great optimization performance.Aiming at the problems existing in the basic memetic algorithm,the algorithm is improved.The basic memetic algorithm and the improved memetic algorithm are used to solve the test functions,verifying the improvement effect of the improved memetic algorithm.Finally,referring to the actual engineering data of hybrid AC/DC microgrid,the improved memetic algorithm is used to solve the optimal operation mathematical model of hybrid AC/DC microgrid in the practical case to verify the correctness and feasibility of the proposed optimal operation method of hybrid AC/DC microgrid considering source-network-load-storage coordination.