發(fā)布時間：2018-04-11 01:11

  本文選題：鋅鎳單液流電池 + 改進(jìn)Thevenin模型��； 參考：《江蘇科技大學(xué)》2017年碩士論文

【摘要】：風(fēng)電、太陽能電池以及電網(wǎng)對大規(guī)模蓄電設(shè)施需求的增長為液流電池開拓了應(yīng)用前景。防化研究院提出的鋅鎳單液流電池,以氧化鎳電極為正極、沉積/溶解型鋅電極為負(fù)極、堿性鋅酸鹽溶液為電解質(zhì),具有成本低、結(jié)構(gòu)簡單、循環(huán)壽命長等優(yōu)點(diǎn),為規(guī)模儲能的發(fā)展和應(yīng)用提供了一個高性價比的解決方案。本文在通過鋅鎳單液流電池電化學(xué)模型、Thevenin等效電路模型以及改進(jìn)Thevenin模型的建立,尋找能夠真實(shí)反映鋅鎳單液流電池外特性動態(tài)變化的最佳模型,為鋅鎳單液流電池的性能研究以及仿真模型進(jìn)一步應(yīng)用奠定基礎(chǔ)。本文主要研究工作如下:(1)基于鋅鎳單液流電池工作原理,本文首先通過電池的能斯特方程和電解液循環(huán)系統(tǒng)建立了電池的電化學(xué)模型和機(jī)械模型,分析了電解液流量對電池性能的影響,并以額定充放電容量為216 Ah的單體電池為例,在恒流充放電模式下進(jìn)行仿真并得出結(jié)果。仿真結(jié)果與實(shí)驗(yàn)結(jié)果能較好地吻合,但仍存在一定誤差。(2)基于鋅鎳單液流電池的電壓關(guān)系,建立了單體電池額定容量為300Ah的Thevenin模型。根據(jù)鋅鎳單液流電池100A脈沖放電實(shí)驗(yàn)數(shù)據(jù),通過參數(shù)辨識得到Thevenin模型參數(shù),再采用高次多項(xiàng)式和指數(shù)函數(shù)擬合的方法得到各模型參數(shù)的解析式,構(gòu)建了鋅鎳單液流電池端電壓的數(shù)學(xué)模型。經(jīng)實(shí)驗(yàn)對比電池放電過程端電壓仿真結(jié)果的相對誤差控制在3.2%以內(nèi)。(3)基于Thevenin模型與鋅鎳單液流電池電化學(xué)機(jī)理分析,把電池由雙電層產(chǎn)生的電化學(xué)極化和由擴(kuò)散產(chǎn)生的濃差極化分別采用RC并聯(lián)電路進(jìn)行等效,提出了改進(jìn)的Thevenin等效電路模型。辨識模型參數(shù)后,通過離散化手段得到改進(jìn)模型中各電壓離散數(shù)學(xué)模型,并在MATLAB/Simulink環(huán)境中搭建仿真模型。經(jīng)實(shí)驗(yàn)對比,100 A恒流放電條件下鋅鎳單液流電池Thevenin模型端電壓仿真值最大相對誤差為5.2%,而改進(jìn)模型端電壓仿真值最大相對誤差為2.38%,并且改進(jìn)模型端電壓相對誤差在整個放電過程中都低于Thevenin模型,說明改進(jìn)模型準(zhǔn)確度更高,對電池恒流放電端電壓的預(yù)測更為準(zhǔn)確。
[Abstract]:The growth of wind power, solar cells and power grid for large-scale storage facilities opens up the application prospects for liquid-flow batteries.Using nickel oxide electrode as positive electrode, depositing / dissolving zinc electrode as negative electrode and alkaline zinc salt solution as electrolyte, the single liquid zinc-nickel battery proposed by the Institute of Chemical Protection has the advantages of low cost, simple structure and long cycle life.It provides a high cost-performance solution for the development and application of scale energy storage.In this paper, through the electrochemical model of zinc nickel single liquid flow cell and the establishment of the Thevenin equivalent circuit model and the improved Thevenin model, the best model which can truly reflect the dynamic change of the external characteristics of the zinc nickel single liquid flow cell is found.It lays a foundation for the study of the performance of zinc-nickel single flow battery and the further application of simulation model.The main work of this paper is as follows: (1) based on the working principle of zinc nickel single flow battery, the electrochemical and mechanical models of the battery are established by the Nernst equation of the battery and the electrolyte circulation system.The effect of electrolyte flow rate on the performance of the battery was analyzed. Taking a single cell with a rated charge and discharge capacity of 216 Ah as an example, the simulation was carried out under the constant current charging and discharging mode and the results were obtained.The simulation results are in good agreement with the experimental results, but there is still a certain error. (2) based on the voltage relationship of the zinc-nickel single flow battery, the Thevenin model of the single cell with rated capacity of 300Ah is established.According to the experimental data of 100A pulse discharge of zinc-nickel single liquid flow battery, the parameters of Thevenin model are obtained by parameter identification, and the analytical expressions of each model parameter are obtained by the method of high order polynomial and exponential function fitting.A mathematical model of the terminal voltage of zinc nickel single flow battery was established.Based on Thevenin model and electrochemistry mechanism analysis of zinc nickel single flow battery, the relative error of the simulation results of terminal voltage during discharge is controlled within 3.2%.The electrochemical polarization produced by the double layer and the concentration polarization caused by diffusion are equivalent to the RC parallel circuit, and the improved Thevenin equivalent circuit model is proposed.After identifying the parameters of the model, the discrete mathematical model of each voltage in the improved model is obtained by means of discretization, and the simulation model is built in the MATLAB/Simulink environment.The maximum relative error of the simulation value of the Thevenin model voltage of Zn-Ni single flow battery under constant current discharge condition is 5.2and the maximum relative error of the modified model voltage simulation value is 2.38, and the relative error of the model terminal voltage is improved.During the whole discharge process, it is lower than the Thevenin model.It shows that the improved model has higher accuracy and more accurate prediction of battery constant current discharge terminal voltage.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM912

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