本文選題：Z源變換器　切入點：分岔　出處：《電子科技大學(xué)》2015年碩士論文

【摘要】：伴隨著電子技術(shù)和控制技術(shù)的發(fā)展,在電能轉(zhuǎn)換領(lǐng)域,我們對系統(tǒng)的效率和可靠性提出了更高的要求。傳統(tǒng)的逆變器,整流器等都由于自身結(jié)構(gòu)的原因,帶來了許多缺陷,例如可靠性低,容易導(dǎo)致受到電磁干擾,進(jìn)而使同一橋臂直通或者開路而損壞器件;而且往往需要多級設(shè)計才可以滿足電壓轉(zhuǎn)換要求,不但增加了系統(tǒng)成本,還引入了較多的諧波成分。但是,近年來,一種被稱為Z源網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)被引入到了開關(guān)變換領(lǐng)域,且涌現(xiàn)了一系列Z源變換器,例如Z源整流器、Z源逆變器等,它們可以克服傳統(tǒng)逆變器,整流器等的自身缺陷,例如可靠性低,升壓降壓能力有局限等,故具有很好的應(yīng)用前景。但同時Z源變換器作為開關(guān)變換器,屬于強(qiáng)非線性-時變系統(tǒng),且由于Z源網(wǎng)絡(luò)的引入使其成為了一個高階系統(tǒng)。為了設(shè)計優(yōu)秀的Z源變換器,我們必須對其非線性特性進(jìn)行詳細(xì)的研究,以指導(dǎo)我們的工程設(shè)計。本文以一個簡單的Z源變換器,即峰值電流模式控制下的同步開關(guān)Z源變換器為研究對象,針對其非線性動力學(xué)行為研究做了如下工作,為該類變換器的建模和動力學(xué)行為研究做出了一定貢獻(xiàn)。1.分析了峰值電流模式控制下同步開關(guān)Z源變換器的工作原理和動態(tài)特性;2.建立了峰值電流模式控制下同步開關(guān)Z源變換器的精確離散迭代模型;3.計算得到了不同分岔參數(shù)下系統(tǒng)的不動點及其雅克比矩陣特征值的變化情況,從而分析了系統(tǒng)的穩(wěn)定性;4.利用數(shù)值仿真得到了系統(tǒng)的分岔圖和Lyapunov指數(shù)譜,重點分析了存在該系統(tǒng)下的邊界碰撞分岔行為,求得了邊界碰撞分岔的上下線和邊界碰撞線;在Matlab/Simulink中搭建變換器的電路仿真模型,通過系統(tǒng)的時域仿真圖和龐加萊截面從不同的側(cè)面展示了系統(tǒng)的動力學(xué)行為演化過程;5.對離散迭代映射產(chǎn)生的穩(wěn)定的迭代序列進(jìn)行了統(tǒng)計特性研究和信息熵研究,從信息論的角度再次來分析系統(tǒng)的動力學(xué)行為,把統(tǒng)計學(xué)和信息論的理論應(yīng)用于開關(guān)變換器動力學(xué)行為的研究;6.對整個系統(tǒng)進(jìn)行實驗研究,實驗結(jié)果表明:本論文對峰值電流模式控制的同步開關(guān)Z源變換器的理論建模,仿真研究是正確的,與實驗結(jié)果完全吻合。
[Abstract]:With the development of electronic technology and control technology, in the field of power conversion, we put forward higher requirements for the efficiency and reliability of the system.Traditional inverters and rectifiers have brought many defects due to their own structure, such as low reliability, easy to be subjected to electromagnetic interference, and then the same bridge arm through or open circuit damage device;Moreover, multistage design is often needed to meet the requirements of voltage conversion, which not only increases the cost of the system, but also introduces more harmonic components.However, in recent years, a topology called Z-source network has been introduced into the field of switching transformation, and a series of Z-source converters, such as Z-source rectifiers and Z-source inverters, have emerged, which can overcome the traditional inverter.The rectifier has its own defects, such as low reliability and limited capacity of boosting and lowering, so it has a good application prospect.In order to design an excellent Z source converter, we must study its nonlinear characteristics in detail to guide our engineering design.In this paper, a simple Z-source converter, the synchronous switching Z-source converter under peak-current-mode control, is taken as the research object. The nonlinear dynamic behavior of the converter is studied as follows.It has made some contributions to the modeling and dynamic behavior research of this kind of converter. 1.The principle and dynamic characteristics of the synchronous switching Z source converter under peak current mode control are analyzed.An exact discrete iterative model for synchronous switching Z-source converter under peak-current-mode control is established.The variation of the fixed point and the eigenvalue of the Jacobian matrix under different bifurcation parameters is obtained, and the stability of the system is analyzed.The bifurcation diagram and Lyapunov exponent spectrum of the system are obtained by numerical simulation. The boundary collision bifurcation behavior in the presence of the system is analyzed and the upper and lower lines and the boundary collision line of the boundary collision bifurcation are obtained.The circuit simulation model of the converter is built in Matlab/Simulink. The dynamic behavior evolution process of the system is demonstrated from different aspects through the time-domain simulation diagram and the Poincare cross section of the system.The statistical properties and information entropy of the stable iterative sequence generated by discrete iterative mapping are studied. The dynamic behavior of the system is analyzed again from the point of view of information theory.The theory of statistics and information theory is applied to the study of the dynamic behavior of switching converter.The experimental results show that the theoretical modeling of the synchronous switching Z-source converter controlled by peak current mode is correct and the simulation results are in good agreement with the experimental results.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM46

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本文編號：1721444