Research On The Principle Of Hydraulic Transformer And Operation Control In Urban Pumped Storage Power Station

Whether renewable energy can be absorbed in large-scale grid connected smart grid largely depends on energy storage technology.Among them,the compressed air energy storage technology system has large capacity,low construction and operation cost,long service life,flexible and adjustable energy storage cycle and unlimited site selection,which has a wide application prospect and development potential,but the low efficiency of traditional air pressure equipment and heat supplement device needs to be solved;the pumped storage technology has mature development,large energy storage capacity,and the hydraulic equipment used is more efficient High,but often subject to the conditions of water resources and geographical environment.To a certain extent,the liquid controlled compressed air energy storage technology,which uses liquid compressed gas to achieve isothermal compression,combines the advantages of the two,fills the defects of the two,and has high efficiency in theory.Therefore,this paper takes the hydraulic control compressed air energy storage technology as the core,combined with the basic principles of compressed air energy storage and pumped storage system,designs an efficient energy storage power station system which is not nmited by the location,realizes the"urbanization" of pumped storage power station,and is named "urban pumped storage power station".In this paper,the principle and structure of Self-adaptive Hydraulic Transformer for pressure self matching and transmission of hydraulic pressure transformation are discussed.The constant power and self coupling operation control strategy of hydraulic system based on hydraulic servo control are studied.The feasibility of operation strategy is verified by simulation and physical experiment.The basic principle,system structure,key equipment and operation characteristics of the urban pumped storage power station system is studies,with selecting air as the energy storage medium,water as the energy transmission carrier and the power generation medium of the liquid equipment;through the research on the characteristics of the autotransformer in the electrical field,it maps to the hydraulic field,and puts forward the autotransformer operation mode of the piston type hydraulic transformer,The self-adaptive hydraulic transformer is designed and its advantages are described.The constant power operation control strategy and the self-adaptive hydraulic transformer suitable for the hydraulic potential energy conversion subsystem in the urban pumped storage power station system are studied.With the AMESim platform,the efficiency simulation of key equipment such as hydraulic cylinder and pump control device is carried out to prove its high efficiency and applicability.The system is designed as 0.3MPa～1.6Mpa The self coupling operation scheme under the energy storage target,the simulation model and the three-state operation scheme are built to reflect the feasibility and advantages of the self coupling operation scheme;on this basis,the real physical experiment platform of the system is built to help the system run stably through PLC programming control,and the realization of the self coupling operation scheme is further verified by physical experiments,and the experimental data are collected The real physical effect of the hydraulic system is analyzed,and the energy storage and power generation efficiency of the physical experiment platform of the self coupling op eration scheme is analyzed.