【摘要】：DC-DC開關變換器是一種時變非線性開關電路,其建模、控制器設計和性能分析一直是功率電子學領域的熱點問題。在眾多非線性控制策略中,滑�？刂频腄C-DC開關變換器具有快速的瞬態(tài)特性和良好的魯棒性,其控制器算法的研究具有重要的理論意義和實際應用價值。本文以DC-DC開關變換器中Buck電路為研究對象,設計有效的滑�？刂撇呗�。 本文的主要研究工作包括：首先,根據(jù)Buck電路建立其數(shù)學模型；其次,研究Buck開關變換器采用傳統(tǒng)滑模方法的控制器設計和參數(shù)選擇,并分析其控制作用下的系統(tǒng)性能;再次,針對傳統(tǒng)滑�？刂拼嬖诘膯栴},研究面向性能的改進型滑�？刂扑惴�,主要包括終端滑�？刂扑惴ê妥赃m應滑模控制算法；最后基于構建的FPGA實驗平臺對Buck開關變換器的傳統(tǒng)滑�？刂扑惴ㄟM行驗證。本文的主要內(nèi)容如下： (1)介紹DC-DC變換器中Buck電路的工作原理,對Buck電路在開關導通和斷開兩種不同狀態(tài)進行分析,利用基爾霍夫電壓、電流定律對系統(tǒng)的狀態(tài)進行數(shù)學描述。采用多種方式對Buck電路進行數(shù)學建模。 (2)在介紹滑�？刂扑惴ǖ幕A上,將滑模變結構控制引入到DC-DC開關變換器控制器設計中。針對Buck電路數(shù)學模型,利用變結構控制理論,設計合理的滑模面以及滑�？刂破鲄�(shù),并分析滑模面的收斂性。 (3)針對傳統(tǒng)滑�？刂剖諗繒r間長,負載電阻與標稱值存在偏差的問題,設計了終端滑模控制和自適應滑�？刂�。傳統(tǒng)滑模控制可以通過選取合適的參數(shù)值使其動態(tài)響應加快,但無論如何選取,其狀態(tài)跟蹤誤差都將無限時間收斂。終端滑�？刂仆ㄟ^改進滑模面的設計形式,使得狀態(tài)跟蹤誤差收斂時間有限；此外由于Buck開關變換器的負載電阻實際值與標稱值存在偏差,造成實際滑模面的選取并非最優(yōu),自適應滑�？刂仆ㄟ^計算電阻電流和輸出電壓,實時地獲取最優(yōu)滑模面。 (4)搭建實驗平臺,驗證了所提滑模控制算法的優(yōu)越性。采用NI9683板卡、NI sbRIO-9606板卡和Buck電路評估板搭建實驗平臺,通過LabView語言實現(xiàn)控制算法,以驗證滑�？刂扑惴ǖ挠行浴Ｍ瑫r編寫PID控制算法作為比較,驗證滑模變結構控制的優(yōu)越性。 通過仿真和實驗平臺的結果進一步證實了本文研究的滑模變結構控制在控制Buck開關變換器所表現(xiàn)出來的優(yōu)勢。兩種面向性能的滑模算法也都具有較好的控制效果,有助于開關電源的性能優(yōu)化和設計效率的提高。
[Abstract]:DC-DC switching converter is a time-varying nonlinear switching circuit. Its modeling, controller design and performance analysis have always been hot issues in the field of power electronics. Among many nonlinear control strategies, sliding mode controlled DC-DC switching converter has fast transient characteristics and good robustness. The research of its controller algorithm has important theoretical significance and practical application value. In this paper, an effective sliding mode control strategy is designed for Buck circuit in DC-DC switching converter. The main research work of this paper is as follows: firstly, the mathematical model of Buck circuit is established; Secondly, the controller design and parameter selection of the Buck switching converter using the traditional sliding mode method are studied, and the system performance under the control action is analyzed. Thirdly, aiming at the problems existing in the traditional sliding mode control, the performance-oriented improved sliding mode control algorithm, including terminal sliding mode control algorithm and adaptive sliding mode control algorithm, is studied. Finally, the traditional sliding mode control algorithm of Buck switching converter is verified based on the constructed FPGA experimental platform. The main contents of this paper are as follows: (1) the working principle of Buck circuit in DC-DC converter is introduced, and the Buck circuit is analyzed in two different states: on-off and off-off, using Kirchhoff voltage, The state of the system is described mathematically by the law of current. Mathematical modeling of Buck circuit is carried out in many ways. (2) on the basis of introducing sliding mode control algorithm, sliding mode variable structure control is introduced into the controller design of DC-DC switching converter. According to the mathematical model of Buck circuit, the reasonable sliding mode surface and sliding mode controller parameters are designed by using variable structure control theory, and the convergence of sliding mode surface is analyzed. (3) the terminal sliding mode control and adaptive sliding mode control are designed to solve the problem of long convergence time of traditional sliding mode control and deviation between load resistance and nominal value. Traditional sliding mode control can speed up its dynamic response by selecting appropriate parameter values, but its state tracking error will converge infinitely in any case. By improving the design form of sliding mode surface, the convergence time of state tracking error is limited. In addition, due to the deviation between the actual value and the nominal value of the load resistance of the Buck switching converter, the selection of the actual sliding mode surface is not optimal. The adaptive sliding mode control obtains the optimal sliding mode surface in real time by calculating the resistance current and output voltage. (4) the advantages of the proposed sliding mode control algorithm are verified by building an experimental platform. NI9683 board, NI sbRIO-9606 board and Buck circuit evaluation board are used to build the experimental platform. The control algorithm is realized by LabView language to verify the effectiveness of the sliding mode control algorithm. At the same time, the advantages of sliding mode variable structure control are verified by programming PID control algorithm as a comparison. The results of simulation and experiment further confirm the advantages of the sliding mode variable structure control in the control of Buck switching converter. The two performance-oriented sliding mode algorithms also have better control effect, which is helpful to the performance optimization and design efficiency improvement of switching power supply.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM46

【參考文獻】

相關期刊論文 前8條

1 張黎;丘水生;;Buck變換器的積分重構滑�？刂芠J];電機與控制學報;2006年01期

2 陳艷峰,丘水生,張光昭,伍言真;不連續(xù)導電模式PWM開關變換器閉環(huán)系統(tǒng)的符號分析法[J];電子學報;2001年11期

3 吳松濤;龔家偉;;在LabVIEW中利用LabSQL實現(xiàn)數(shù)據(jù)庫訪問[J];國外電子測量技術;2006年04期

4 陳福彬;柴海莉;高晶敏;;基于LabVIEW的自動化測試平臺的設計[J];國外電子測量技術;2012年11期

5 吳宏鑫,沈少萍;PID控制的應用與理論依據(jù)[J];控制工程;2003年01期

6 王偉,張晶濤,柴天佑;PID參數(shù)先進整定方法綜述[J];自動化學報;2000年03期

7 謝啟 ,溫曉行 ,高琴妹 ,顧啟民;LabVIEW軟件中菜單形式的用戶界面設計與實現(xiàn)[J];微計算機信息;2005年15期

8 張昌凡,王耀南;滑模變結構的智能控制及其應用[J];中國電機工程學報;2001年03期

，

本文編號：2434652