Research progress and key technologies in vertical gravity energy storage systems
Gravity energy storage technology,which relies on solid weights,is expected to become an important energy storage solution in the water-scarce areas of north and northwest China.Its independence from water,high efficiency,and flexible location make it ideally suited to meet the demand for energy storage technology in the large-scale renewable energy power grids.However,the nonfluidity and discontinuity of solid weights present challenges.The start/stop and load/unload processes involving these weights can impact both the mechanical transmission and power grid system,an important consideration in solid gravity energy storage.This paper introduces the research development and demonstration projects related to vertical gravity energy storage technology,based on vertical shafts and ground buildings,both domestically and internationally.It further explores the mechanical transmission technology of vertical lifting,horizontal transfer,automatic joint,generator/motor,and grid-connected control technology.Finally,this paper discusses the future development trends of vertical gravity energy storage technology.The research shows that although many technical schemes have been proposed for the vertical gravity energy storage system,there are still many problems to address.These include the rapid lifting and transfer,process control of start/stop and load/unload of heavy loads,grid-connected control,and energy efficiency improvement.As construction costs decrease,efficiency improves,and lifespan extends,the gravity energy storage system is expected to see commercially application in the future.
gravity energy storagevertical liftingmechanical transmissionmotor generatorgrid-connected control
万方数据
维普
