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Studies On Key Technologies Of Distributed Energy Storage System

Posted on:2015-06-09Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z WuFull Text:PDF
GTID:1222330452470556Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Distributed energy storage system (DESS) can be applied in most aspects ofpower system. With broad application prospects and great application potential, DESSwill play a more important role in future power grids. Now industrial applications ofDESS are still at the beginning stage. Several key technologies of DESS need furtherinvestigation to lay the foundation for the promotion of its application. In thisdissertation, studies on modeling, control, efficiency analysis, and energymanagement of DESS are carried out based on a microgrid experiment system.(1) Typical models of various DESS are summarized, including lead-acid battery,li-ion battery, flow batter, super capacitor, hydrogen storage system and flywheel. Thecharacteristcs and applicable scenarios of different models are analyzed. Thegrid-connnection structures and control schemes of each DESS are also presented indetail.(2) A microgrid experiment system is presented, based on which plenty ofexperments of DESSs are carried out. Calculation methods for parameters ofdifferent models of DESS are presented considering experiments results. Theeffectiveness of DESS models and parameter identification methods are validated bythe comparison of experiment data and simulation results.(3) A simulation model of micro compressed air energy storage system ispresented, including detailed models of speed governer, valve controller, turbine andthermal energy storage unit. The proposed model is verified by test results.(4) The efficiency characteristics of two DESSs with high energy density,compressed air energy storage system and hydrogen, are analyzed with theorioticaland experiment methods. Reasons of energy loss in each part of the DESS areanalyzed and detailed efficiency of each part is given via calculation andexperiments.(5) A hybrid energy storage system (HESS) based on hydrogen energy storageand battery is introduced. An energy management strategy of the HESS is proposed inislanded microgrid, which can guarantee the efficiency of fuel cell and electrolyzerwhile maintain the SOC of battery in a reasonable level. With proposed energy management strategy, the HESS can also smooth the PV fluctrations and maintain thevoltage and frequency of the islanded microgrid.
Keywords/Search Tags:Distributed energy storage system, modeling and test verification, parameter identification, energy storage efficiency, hybrid energy storage system, energy management strategy
PDF Full Text Request
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