Research On Multiple Time Scale Optimal Operation Method With Source-load-storage Coordination Of Hybrid AC/DC Microgrid

With the application of the DC load more and more widely,the hybrid AC/DC micro grid has become a form of microgrid which is much concerned.AC / DC hybrid microgrid has unique advantages compared with the traditional AC microgrid.It can improve the control efficiency,reduce the power line loss,improve the power quality,and provide convenient access platform for DC load.These advantages not only can effectively reduce the costs of equipment in whole power supply system,but also improve the level of operation and control.In the study of the optimal operation model of microgrid,with the increasing complexity of the hybrid AC/DC microgrid operating conditions,the multi time scale model considering source-load-storage coordination will be a difficult point in the research of hybrid AC/DC microgrid.This paper studies the multi time scale optimal operation method of hybrid AC/DC microgrid with source-load-storage coordination.This paper introduces the background and significance of the research,also the development trend of AC / DC hybrid microgrid at home and abroad,and the research status of optimization operation is summarized.The concept and characteristics of AC / DC hybrid microgrid are expounded while various operation modes of AC / DC hybrid microgrid are summarized,then the characteristics of source,lord,and storage in AC / DC hybrid microgrid are analyzed.The multi time scale model is embodied in two aspects: the Day ahead scheduling model and the real-time economic dispatch model.In day ahead scheduling model,this paper established an optimal operation model by taking the economic and environmental protection of AC/DC hybrid microgrid and load translation into account.In this constructed source-Load-storage coordination bilevel programming model,the load translation and energy storage strategy were considered as the load transfer strategy,which was used as the upper level decision variables and the upper level objective function maximizes the transfer benefits concerning user's benefit loss;The optimized operation strategy was used as the lower level decision variables and the lower objective function minimizes the optimal operating cost of AC area and DC area.In real-time economic dispatch model,firstly,the concept of electricity-value-equivalent of storage in AC/DC hybrid micro grid is proposed,while its evaluation model is put forward.On the basis of this,the real-time economic dispatch model is built on the 15 min level of the hybrid micro grid.In this model,the behavior of energy storage is decoupled from the time by the electricity-value-equivalent model,so that the cost of energy storage and controllable micro source can be considered from the same point of view.To solve the day ahead scheduling model,chaos particle swarm optimization algorithm combined with Yalmip optimization software was selected.At the same time,the real-time economic dispatch model was solved by imperial competition algorithm.A numerical examples was given to verify that the proposed day ahead scheduling method can improve and coordinate microgrid's revenue and users' benefits,meanwhile is more suitable for the practical operation of AC/DC hybrid microgrid.While the proposed real-time economic dispatch model can maximize the elimination of subjectivity when formulate the behavior strategy of storage in real-time economic dispatch energy storage,so to guide the energy storage behavior in a better way...