【摘要】：近年來,風(fēng)能、太陽能等新能源發(fā)電在我國電力系統(tǒng)中所占的比例逐漸上升,與之相應(yīng)的電池儲(chǔ)能系統(tǒng)也引起了廣泛關(guān)注。在傳統(tǒng)鋰離子電池儲(chǔ)能系統(tǒng)中,需要將大量單體電池串并聯(lián)成組后連接到變流器。當(dāng)電池組中各個(gè)單體容量、內(nèi)阻等參數(shù)存在的不一致時(shí),將導(dǎo)致單體之間在使用過程中互相制約,電池組的能量利用率大幅度降低。針對(duì)這一問題本文深入研究了電池柔性成組技術(shù),即將含上百只單體串聯(lián)的電池組分成多個(gè)低電壓電池模塊,并利用多電平變換器柔性成組以提高儲(chǔ)能系統(tǒng)使用壽命和電池整體能量利用率。其中重點(diǎn)針對(duì)柔性成組儲(chǔ)能系統(tǒng)的基本原理、系統(tǒng)控制及監(jiān)控平臺(tái)展開了相關(guān)研究。首先,分析了傳統(tǒng)電池成組存在的問題及其原因,引出了電池柔性成組概念,論述了其原理和技術(shù)特點(diǎn),闡述了柔性成組儲(chǔ)能系統(tǒng)構(gòu)成,并對(duì)可應(yīng)用于電池柔性成組的不同變流器拓?fù)浣Y(jié)構(gòu)進(jìn)行了對(duì)比分析,最終選擇H橋級(jí)聯(lián)型儲(chǔ)能變流器作為本文的主電路拓?fù)洹Ｔ谇拔幕A(chǔ)上,對(duì)基于電池柔性成組技術(shù)的儲(chǔ)能變流器的系統(tǒng)控制進(jìn)行了深入研究,先從調(diào)制策略、基礎(chǔ)控制策略層面進(jìn)行了闡述,而后重點(diǎn)分析了柔性成組儲(chǔ)能系統(tǒng)的均衡控制策略。分別從相間均衡和相內(nèi)均衡角度論述了 SOC均衡以及電壓均衡兩種系統(tǒng)均衡控制策略,并結(jié)合當(dāng)前退運(yùn)電池梯次利用于儲(chǔ)能系統(tǒng)的研究背景,提出了基于不同容量電池模塊的SOC均衡控制策略。本文還搭建了柔性成組儲(chǔ)能系統(tǒng)的監(jiān)控平臺(tái),上位機(jī)人機(jī)交互界面選用NI公司的LabVIEW開發(fā)環(huán)境來設(shè)計(jì),在充分利用實(shí)驗(yàn)室現(xiàn)有設(shè)備條件的前提下,結(jié)合CAN通信和TCP通信技術(shù),實(shí)現(xiàn)對(duì)3相共24個(gè)電池模塊的聯(lián)合實(shí)時(shí)監(jiān)控。每個(gè)電池模塊監(jiān)控程序都采用模塊化設(shè)計(jì),包括了實(shí)時(shí)顯示、實(shí)時(shí)存儲(chǔ)、數(shù)據(jù)收發(fā)、數(shù)據(jù)處理、數(shù)據(jù)實(shí)時(shí)動(dòng)態(tài)調(diào)用等核心模塊,并給出了系統(tǒng)監(jiān)控平臺(tái)運(yùn)行結(jié)果。最后,本文給出了柔性成組儲(chǔ)能系統(tǒng)的調(diào)制策略、基礎(chǔ)控制策略以及系統(tǒng)均衡控制,包括SOC均衡、電壓均衡以及基于不同容量電池的均衡控制策略的仿真分析,并在實(shí)驗(yàn)室的柔性成組儲(chǔ)能系統(tǒng)樣機(jī)上對(duì)SOC均衡控制和電壓均衡控制進(jìn)行了實(shí)驗(yàn)驗(yàn)證和波形分析。
[Abstract]:In recent years, the proportion of new energy generation, such as wind energy and solar energy, has gradually increased in China's power system, and the corresponding battery energy storage system has also attracted wide attention. In the traditional Li-ion battery energy storage system, a large number of single-cell batteries need to be serially connected to the converter. When the cell capacity, internal resistance and other parameters in the battery pack are inconsistent, it will lead to the mutual restriction of each other in the process of use, and the energy utilization ratio of the battery pack will be greatly reduced. In order to solve this problem, the flexible battery group technology is deeply studied in this paper, that is, the battery pack with hundreds of monomers in series is divided into several low-voltage battery modules. The multilevel converters are flexible to improve the service life of the energy storage system and the overall energy efficiency of the battery. This paper focuses on the basic principle of flexible group energy storage system, system control and monitoring platform. Firstly, this paper analyzes the problems and causes of traditional battery grouping, introduces the concept of flexible battery grouping, discusses its principle and technical characteristics, and expounds the composition of flexible group energy storage system. The topology of different converters which can be used in flexible groups of batteries is compared and analyzed. Finally, H-bridge cascaded energy storage converter is chosen as the main circuit topology in this paper. On the basis of the above, the system control of the energy storage converter based on the flexible group technology of battery is studied in depth. Firstly, the modulation strategy and the basic control strategy are described. Then the equilibrium control strategy of flexible group energy storage system is analyzed. From the angle of interphase equalization and intra-phase equalization, the equalization control strategies of SOC equalization and voltage equalization are discussed, and combined with the research background of the current retrograde battery ladder used in energy storage system. A SOC equalization control strategy based on different capacity battery modules is proposed. The monitoring platform of flexible group energy storage system is also built in this paper. The man-machine interface of the host computer is designed by using the LabVIEW development environment of NI Company. Under the premise of making full use of the existing equipment in the laboratory, the paper combines the CAN communication and TCP communication technology. Realize the joint real-time monitoring of 24 battery modules in 3-phase. Each battery module monitoring program is designed by modularization, including real-time display, real-time storage, data transceiver, data processing, real-time data dynamic call and so on. The results of the system monitoring platform are given. Finally, this paper presents the modulation strategy, basic control strategy and system equalization control of flexible group energy storage system, including SOC equalization, voltage equalization and simulation analysis of equalization control strategy based on different capacity battery. The SOC equalization control and voltage equalization control are tested and analyzed on the prototype of the flexible group energy storage system in the laboratory.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM912;TM46

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本文編號(hào)：2406792