本文選題：DC-DC變換器 + 混雜自動(dòng)機(jī)模型　； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：DC DC變換器在本質(zhì)上是一類典型的混雜動(dòng)態(tài)系統(tǒng)，同時(shí)包含連續(xù)和離散兩個(gè)子系統(tǒng)�；祀s自動(dòng)機(jī)模型是混雜系統(tǒng)的一個(gè)簡(jiǎn)單的形式化模型，能直觀、簡(jiǎn)便的描述混雜系統(tǒng)的連續(xù)和離散特性。本文主要進(jìn)行了以下幾個(gè)方面的研究： 一、介紹了混雜系統(tǒng)的定義、特點(diǎn)及其研究?jī)?nèi)容，重點(diǎn)闡述了混雜自動(dòng)機(jī)模型。然后針對(duì)三種基本的DC DC變換器：Buck、Boost和Buck boost變換器，分別建立了其混雜自動(dòng)機(jī)模型。 二、在此混雜自動(dòng)機(jī)模型的基礎(chǔ)上，研究了DC DC變換器的基本控制方法：峰值電流控制、平均電流控制、電流滯環(huán)控制、預(yù)測(cè)占空比控制。根據(jù)電路理論，這些基本控制方法可以簡(jiǎn)化為簡(jiǎn)單的邊界選取問(wèn)題：其中，峰值電流控制，選取電感的峰值電流與恒定的開(kāi)關(guān)周期作為邊界條件；平均電流控制，選取合適的鋸齒波與電感電流進(jìn)行比較作為邊界條件；電流滯環(huán)控制，通過(guò)設(shè)置一定環(huán)寬，選取電感電流的上限值和下限值作為邊界條件；預(yù)測(cè)占空比控制，根據(jù)預(yù)測(cè)的占空比大小，選取開(kāi)關(guān)管的導(dǎo)通時(shí)間以及恒定的開(kāi)關(guān)周期作為邊界條件。 三、提出了一種基于混雜自動(dòng)機(jī)模型的DC DC變換器的CCMDCM統(tǒng)一控制方法。根據(jù)能量守恒定律，分別計(jì)算出CCM與DCM模式中電感的峰值電流、周期內(nèi)開(kāi)關(guān)管的關(guān)斷時(shí)間以及臨界電阻值，首先根據(jù)臨界電阻值判斷DC DC變換器的具體工作模式，然后選取對(duì)應(yīng)模式的電感電流峰值與開(kāi)關(guān)管關(guān)斷時(shí)間為邊界條件。該方法在寬負(fù)載范圍內(nèi)，能使DC DC變換器同時(shí)穩(wěn)定工作于CCM和DCM模式，且不受占空比的限制，穩(wěn)態(tài)時(shí)的開(kāi)關(guān)頻率恒定。最后，，運(yùn)用MATLAB/stateflow對(duì)該控制算法進(jìn)行仿真，仿真結(jié)果驗(yàn)證了本方法具有算法簡(jiǎn)單、動(dòng)態(tài)響應(yīng)快、穩(wěn)態(tài)精度高等優(yōu)點(diǎn)。 混雜自動(dòng)機(jī)模型是包含連續(xù)時(shí)間和離散事件動(dòng)態(tài)系統(tǒng)的模型，未對(duì)離散事件動(dòng)態(tài)特性作任何近似處理，因此能夠準(zhǔn)確的描述DC DC變換器的動(dòng)態(tài)過(guò)程�；诨祀s自動(dòng)機(jī)模型的控制把DC DC變換器的連續(xù)過(guò)程和離散切換過(guò)程進(jìn)行統(tǒng)一的控制，具有重要的理論和現(xiàn)實(shí)意義，能進(jìn)一步推廣到其他的電力電子變換器中。
[Abstract]:DC / DC converter is a kind of typical hybrid dynamic system, which consists of two subsystems: continuous and discrete. Hybrid automata model is a simple formal model of hybrid systems. It can describe the continuous and discrete characteristics of hybrid systems intuitively and easily. This article mainly carries on the following aspects research: Firstly, the definition, characteristics and research contents of hybrid system are introduced, and the hybrid automata model is emphasized. Then, the hybrid automata models of three basic DC-DC converters, the Buck boost converter and the one of the two converters, are established respectively. Secondly, based on the hybrid automaton model, the basic control methods of DC / DC converter are studied: peak current control, average current control, current hysteresis control, predictive duty cycle control. According to the circuit theory, these basic control methods can be simplified as simple boundary selection problems: the peak current control, the peak current of inductor and the constant switching period are selected as boundary conditions; Choosing suitable sawtooth wave and inductor current as boundary condition; current hysteresis control, selecting the upper and lower limit value of inductance current as boundary condition by setting a certain loop width; predictive duty cycle control, According to the predicted duty cycle, the switching time and the constant switching period are selected as the boundary conditions. Thirdly, a CCMDCM unified control method for DC / DC converters based on hybrid automata model is proposed. According to the law of conservation of energy, the peak current of inductor in CCM and DCM mode, the switching off time and critical resistance of switch in the period are calculated, respectively. Firstly, the concrete working mode of DC / DC converter is judged according to the critical resistance. Then the peak inductance current of the corresponding mode and the switch off time are selected as the boundary conditions. The method can make DC / DC converters work stably in both CCM and DCM modes in a wide load range, and the switching frequency is constant in steady state without the limitation of duty cycle. Finally, the control algorithm is simulated by MATLAB/stateflow. The simulation results show that the method has the advantages of simple algorithm, fast dynamic response and high steady-state precision. Hybrid automata model is a dynamic system model with continuous time and discrete events. It can accurately describe the dynamic process of DC / DC converters without any approximate treatment of the dynamic characteristics of discrete events. The control based on hybrid automata model unifies the continuous and discrete switching processes of DC / DC converters, which has important theoretical and practical significance and can be extended to other power electronic converters.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張波;;電力電子學(xué)亟待解決的若干基礎(chǔ)問(wèn)題探討[J];電工技術(shù)學(xué)報(bào);2006年03期

2 鄭雪生;李春文;戎袁杰;;DC/AC變換器的混雜系統(tǒng)建模及預(yù)測(cè)控制[J];電工技術(shù)學(xué)報(bào);2009年07期

3 柳玉秀,許峰,徐殿國(guó);PWM型DC-DC變換器非線性控制策略的研究[J];電工技術(shù)雜志;2003年10期

4 李秀改,岳紅,高東杰;復(fù)雜工業(yè)過(guò)程新型控制方法——混雜系統(tǒng)控制理論的研究[J];化工自動(dòng)化及儀表;2001年05期

5 李曉山，周巢塵;時(shí)段演算綜述[J];計(jì)算機(jī)學(xué)報(bào);1994年11期

6 張立炎,徐華中,錢積新;一類混雜系統(tǒng)建模和優(yōu)化控制的研究[J];控制工程;2005年05期

7 鄭剛,譚民,宋永華;混雜系統(tǒng)的研究進(jìn)展[J];控制與決策;2004年01期

8 吳鋒,劉文煌,鄭應(yīng)平;混雜系統(tǒng)方法及其在過(guò)程控制中的應(yīng)用[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);1997年11期

9 胡宗波,張波,鄧衛(wèi)華,張涌萍;基于切換線性系統(tǒng)理論的DC-DC變換器控制系統(tǒng)的能控性和能達(dá)性[J];中國(guó)電機(jī)工程學(xué)報(bào);2004年12期

10 胡宗波,張波,胡少甫,鄧衛(wèi)華;Boost功率因數(shù)校正變換器單周期控制適用性的理論分析和實(shí)驗(yàn)驗(yàn)證[J];中國(guó)電機(jī)工程學(xué)報(bào);2005年21期

本文編號(hào)：1836911