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Study On The Modeling Of Lead-acid Battery Storage System And Its Application

Posted on:2014-09-27Degree:MasterType:Thesis
Country:ChinaCandidate:J ZhangFull Text:PDF
GTID:2252330425460206Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
Recently, wind power installed capacity in our country has been enlarging, whichbring about some problems in wind power interaction, if appropriate control measuresare not be taken, the fluctuation of the power aroused by the fluctuation of windvelocity, would seriously affect the grid when the wind turbine connect to the gird inlarge scale. In order to solve the problem of wind power fluctuation and to improvethe efficiency of wind energy utilization, the method of utilizing storage system witha certain capacity in wind farm is taken into account. Lead-acid batteries has beenwidely used in electrical energy storage system and electric vehicles because of itslow price and mature technology. In order to better analyze the operating characteristics oflead-acid battery energy storage system, it is significant to establish its accurate simulationmodel based on the charge-discharge characteristics of the battery. In view of theapplication of the lead-acid battery on smoothing wind power fluctuation, this thesisstudies from the following three perspectives:Firstly, this thesis analyzes the advantages and disadvantages of the PNGV(Partnership for a New Generation of Vehicles, PNGV)model and the Third-Ordermodel. Combining the advantages of the two models, this thesis put forward animproved PNGV model,and establishes its digital simulation model with the help ofMatlab/Simulink. Simulation proves that the improved PNGV model can better reflectthe dynamic charge and discharge characteristics of lead-acid batteries on the premiseof considering more external factors. Then, the sensitive analysis has been done tofind the factors that have the greatest impact on the operating characteristics oflead-acid batteries, which helps adjusting the parameters and optimizing structure ofthe model.Secondly, as the lead-acid batteries use the PCS(Power Convertion System, PCS) toconnest to the grid, this thesis establishes the PCS simulation model. The DC/DC takesthe voltage outer loop and current inner loop control strategy, and the DC/AC takes thepower outer loop and current inner loop control strategy. With the help ofMatlab/Simulink, the thesis establishes bidirectional DC/DC and DC/AC modelrespectively.Simulation proves that the PCS based on the two-stage structure of theDC/DC and DC/AC can achieve real-time tracking of active and reactive power. Finally, based on the data of State Grid demonstration project-Zhangjiakou windfarm, the thesis analysis the relationship between the time constant of the low-passfilter and the capacity required by the energy storage system. Considering theeffectiveness and economy, this thesis determines the capacity of the lead-acid batteryenergy storage system. Finally, this thesis uses the Simulink model of lead-acidbattery energy storage system to simulate and analyze actual data on wind power. Thesimulation proves that the lead-acid battery energy storage system can smooth theactive power fluctuations of wind power very well.
Keywords/Search Tags:Wind power, Lead-acid batteries, Energy storage system, Smooth activepower fluctuation
PDF Full Text Request
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