發(fā)布時(shí)間：2018-10-24 20:11

【摘要】：電能對(duì)整個(gè)社會(huì)的發(fā)展起著重要作用,不論是生產(chǎn)還是生活,突然斷電都會(huì)帶來(lái)嚴(yán)重后果,影響正常社會(huì)秩序。尤其是生產(chǎn)生活中的重要設(shè)施,如醫(yī)院、煉鋼廠(chǎng)等,如果發(fā)生停電情況,將造成重大的政治影響和經(jīng)濟(jì)損失。本文研究了一種新的儲(chǔ)能供電系統(tǒng)。系統(tǒng)在儲(chǔ)能方面采用釩電池儲(chǔ)能為主,鉛酸電池儲(chǔ)能為輔的結(jié)構(gòu);變換器方面采用雙向變換器,實(shí)現(xiàn)一機(jī)兩用;控制方面通過(guò)改進(jìn)能量控制算法,優(yōu)化了能量調(diào)度,提高了系統(tǒng)使用壽命和供電可靠性,并且有利于系統(tǒng)模塊化和容量擴(kuò)充。論文首先介紹了新型全釩液氧化還原電池儲(chǔ)能技術(shù),并對(duì)電池進(jìn)行研究分析,建立了等效損耗仿真模型,動(dòng)態(tài)的模擬了電池充放電過(guò)程中主要參數(shù)變化。在對(duì)電池特性研究的基礎(chǔ)上設(shè)計(jì)了電池充放電所需的雙向接口變換器。在分析對(duì)比幾中常用拓?fù)浜筮x擇了結(jié)構(gòu)簡(jiǎn)單、功率器件電氣應(yīng)力較小的雙向半橋Buck/Boost作為變換器拓?fù)�。其�?論文基于釩電池儲(chǔ)能供電模塊,提出了整個(gè)儲(chǔ)能供電系統(tǒng)結(jié)構(gòu)。其中鉛酸電池及其接口變換器組成輔助儲(chǔ)能供電模塊,配合釩電池儲(chǔ)能供電模塊工作。而雙向DC-AC變換器在電網(wǎng)有電時(shí)和電網(wǎng)一起組成供電模塊給儲(chǔ)能單元充電;在電網(wǎng)斷電時(shí),和交流負(fù)載一起組成負(fù)載模塊,由儲(chǔ)能模塊進(jìn)行供電。針對(duì)系統(tǒng)中電網(wǎng),釩電池,鉛酸電池,負(fù)載之間的多種能量供需狀態(tài),系統(tǒng)需要對(duì)各模塊進(jìn)行能量管理控制�？紤]到系統(tǒng)共直流母線(xiàn)結(jié)構(gòu),論文參考并改進(jìn)了直流母線(xiàn)電壓信號(hào)控制算法并應(yīng)用改進(jìn)后的算法對(duì)系統(tǒng)工作模態(tài)進(jìn)行了劃分,并分析了模態(tài)之間的相互轉(zhuǎn)換。論文在改進(jìn)后的能量管理控制策略下針對(duì)各接口變換器進(jìn)行了控制框圖設(shè)計(jì)。其中DC-DC變換器采用了電壓外環(huán)疊加電流內(nèi)環(huán)共用的控制結(jié)構(gòu),實(shí)現(xiàn)了工作模態(tài)無(wú)縫切換,但帶來(lái)了PI控制器退飽和問(wèn)題,論文通過(guò)引入抗積分?jǐn)?shù)字PI解決了PI退飽和問(wèn)題。DC-AC變換器因并離網(wǎng)工作模態(tài)差異大,論文分別進(jìn)行了獨(dú)立設(shè)計(jì)。對(duì)應(yīng)控制框圖,在變換器數(shù)學(xué)建模基礎(chǔ)上,論文結(jié)合系統(tǒng)具體參數(shù)在離散域設(shè)計(jì)了控制器參數(shù)。最后建立了Matlab/simulink仿真模型,對(duì)前面的理論分析結(jié)果和控制策略設(shè)計(jì)進(jìn)行了仿真驗(yàn)證,證明了理論分析的正確性和控制策略的有效性。
[Abstract]:Electric energy plays an important role in the development of the whole society. Whether it is production or life, sudden power failure will bring serious consequences and affect the normal social order. In particular, important facilities in production and life, such as hospitals, steel mills and so on, will cause great political impact and economic losses if power failure occurs. In this paper, a new energy storage power supply system is studied. The system adopts the structure of vanadium battery as the main energy storage, lead-acid battery as the auxiliary energy storage; the converter adopts the bidirectional converter to realize a dual purpose; in the control aspect, the energy scheduling is optimized by improving the energy control algorithm. The system service life and power supply reliability are improved, and it is beneficial to modularization and capacity expansion of the system. In this paper, the energy storage technology of a new type of vanadium redox battery is introduced, and the battery is studied and analyzed, and the simulation model of equivalent loss is established, and the main parameters of the battery during charge and discharge are simulated dynamically. Based on the study of battery characteristics, a bidirectional interface converter for battery charging and discharging is designed. After analyzing and comparing several common topologies, bidirectional half-bridge Buck/Boost with simple structure and low electrical stress of power devices is selected as converter topology. Secondly, based on the energy storage and power supply module of vanadium battery, the structure of the whole energy storage system is proposed. Lead acid battery and its interface converter form auxiliary energy storage power supply module and work with vanadium battery energy storage power supply module. The bi-directional DC-AC converter forms a power supply module to charge the energy storage unit together with the grid when the power is available, and when the power is off, it forms a load module together with the AC load, which is powered by the energy storage module. In view of the various energy supply and demand states between power grid, vanadium battery, lead acid battery and load, the system needs to control the energy management of each module. Considering the common DC bus structure of the system, this paper refers to and improves the DC bus voltage signal control algorithm, and applies the improved algorithm to partition the operating modes of the system, and analyzes the interconversion between the modes. In this paper, the control block diagram of each interface converter is designed under the improved energy management control strategy. The DC-DC converter adopts the common control structure of voltage outer loop superposition current inner loop to realize the seamless switching of working mode, but it brings the problem of desaturation of PI controller. In this paper, the problem of PI desaturation is solved by introducing anti-integration digital PI. The DC-AC converter is designed independently because of the large difference in the mode of operation. Corresponding to the control block diagram, the controller parameters are designed in discrete domain based on the mathematical modeling of the converter. Finally, the Matlab/simulink simulation model is established, and the simulation results and control strategy design are verified, which proves the correctness of the theoretical analysis and the effectiveness of the control strategy.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM912;TM46

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本文編號(hào)：2292426