Buck變換器的滑?？刂蒲芯浚▽O明志）.ppt

1、Thursday, August 13, 2020,The College of Information Science and Engineering,答辯人 ：孫明志,指導(dǎo)教師 ：鄭艷 副教授,Buck變換器的滑?？刂蒲芯?Thursday, August 13, 2020,The College of Information Science and Engineering,緒論,Buck變換器的工作原理與數(shù)學(xué)模型,Buck變換器的自適應(yīng)積分滑模控制,Buck變換器的自適應(yīng)動(dòng)態(tài)滑?？刂?結(jié)論與展望,Thursday, August 13, 2020,The College of Infor

2、mation Science and Engineering,課題背景及研究意義,由于開(kāi)關(guān)電源在重量、體積、 能耗等方面都比線性電 源有顯著減少，因此開(kāi)關(guān)電源的應(yīng)用得到了迅速推廣， 但 是常用的PID控制系統(tǒng)對(duì)系統(tǒng)參數(shù)的變化比較敏感，當(dāng)負(fù)載 大范圍變化時(shí)，開(kāi)關(guān)變換器存在動(dòng)態(tài)響應(yīng)速度慢、 輸出波 形有畸變等缺點(diǎn)。 而滑?？刂频淖儞Q器具有穩(wěn)定范圍寬、動(dòng)態(tài)響應(yīng)快、 魯棒性強(qiáng)等優(yōu)點(diǎn)，成為研究的熱點(diǎn)。,Thursday, August 13, 2020,The College of Information Science and Engineering,Buck變換器的工作原理與數(shù)學(xué)模型,Thursda

3、y, August 13, 2020,The College of Information Science and Engineering,Buck變換器的工作原理,圖2.1Buck變換器電路,Thursday, August 13, 2020,The College of Information Science and Engineering,開(kāi)關(guān)T導(dǎo)通時(shí),圖 2.2 開(kāi)關(guān)T導(dǎo)通時(shí)的Buck電路圖,Thursday, August 13, 2020,The College of Information Science and Engineering,開(kāi)關(guān)T關(guān)斷時(shí),圖2.3 開(kāi)關(guān)T關(guān)斷時(shí)的Bu

4、ck電路圖,Thursday, August 13, 2020,The College of Information Science and Engineering,Buck變換的數(shù)學(xué)模型,為考慮了負(fù)載變化的不確定參數(shù)且假設(shè),(2.1),取x1為誤差電壓，x2為電容電流,其中,(2.2),Thursday, August 13, 2020,The College of Information Science and Engineering,Buck變換器的自適應(yīng)積分滑模控制,Thursday, August 13, 2020,The College of Information Science

5、 and Engineering,考慮如下不確定的二階系統(tǒng),(3.1),問(wèn)題描述,積分型切換函數(shù)設(shè)計(jì)為,(3.2),(3.3),Thursday, August 13, 2020,The College of Information Science and Engineering,滑動(dòng)模態(tài)方程為,(3.5),積分滑模控制器設(shè)計(jì),(3.6),穩(wěn)定性分析,(3.7),Thursday, August 13, 2020,The College of Information Science and Engineering,設(shè)計(jì)自適應(yīng)律為,(3.9),(3.8),穩(wěn)定性分析,(3.10),自適應(yīng)積分滑模

6、控制,控制器設(shè)計(jì),(3.11),Thursday, August 13, 2020,The College of Information Science and Engineering,的攝動(dòng)，原系統(tǒng)變?yōu)?考慮系統(tǒng)參數(shù),(3.12),其中,將式(3.8),(3.12)代入,可得,改進(jìn)的自適應(yīng)積分滑?？刂破?(3.13),Thursday, August 13, 2020,The College of Information Science and Engineering,改進(jìn)的控制器為,(3.14),設(shè)計(jì)自適應(yīng)律為,(3.15),(3.16),Thursday, August 13, 2020

7、,The College of Information Science and Engineering,穩(wěn)定性分析,(3.17),(3.18),Thursday, August 13, 2020,The College of Information Science and Engineering,Buck變換器的自適應(yīng)積分滑?？刂破?(3.21),仿真研究,(3.22),Buck變換器改進(jìn)的自適應(yīng)積分滑?？刂破?系統(tǒng)參數(shù),Thursday, August 13, 2020,The College of Information Science and Engineering,圖3.1 輸出電壓x

8、1的變化曲線 圖3.2 輸出電壓x1的局部放大圖,結(jié)論：積分滑模控制的快速性明顯好于常規(guī)滑模控制并且有 效地消除了靜差,Thursday, August 13, 2020,The College of Information Science and Engineering,圖3.3 輸出電壓x1的變化曲線 圖3.4 輸出電壓x1的變化曲線,結(jié)論：當(dāng)負(fù)載變化時(shí)，自適應(yīng)積分滑模控制有效提高了系統(tǒng) 的快速性，增強(qiáng)對(duì)負(fù)載變化的魯棒性。,負(fù)載R=100,負(fù)載R=1,Thursday, August 13, 2020,The College of Information Science and Engin

9、eering,圖3.5 自適應(yīng)積分滑?？刂?圖3.6 改進(jìn)的自適應(yīng)積分滑模控制 輸出電壓x1的變化曲線 輸出電壓x1的變化曲線,1V階躍擾動(dòng)時(shí),Thursday, August 13, 2020,The College of Information Science and Engineering,圖3.7 輸出電壓x1的變化曲線 圖3.8 輸出電壓x1的放大圖,1V正弦擾動(dòng)時(shí),結(jié)論：改進(jìn)后的自適應(yīng)積分滑模的穩(wěn)態(tài)性能明顯的提高,Thursday, August 13, 2020,The College of Information Science and Engineering,Buck變換器的

10、自適應(yīng)動(dòng)態(tài)滑模控制,Thursday, August 13, 2020,The College of Information Science and Engineering,考慮如下線性二階系統(tǒng),(4.1),定義切換函數(shù)為,(4.2),問(wèn)題描述,由,求得等效控制為,(4.3),Thursday, August 13, 2020,The College of Information Science and Engineering,(4.4),滑動(dòng)模態(tài)方程為,采用等速趨近律,則動(dòng)態(tài)控制律為,(4.5),(4.6),Thursday, August 13, 2020,The College of I

11、nformation Science and Engineering,考慮不確定二階系統(tǒng),(4.8),滑動(dòng)模態(tài)方程變?yōu)?(4.7),此時(shí)，不確定參數(shù) 被引入到滑動(dòng)模態(tài)方程中，對(duì)系統(tǒng) 的性能產(chǎn)生影響。,Thursday, August 13, 2020,The College of Information Science and Engineering,定義切換函數(shù),(4.9),其中,為對(duì)系統(tǒng)中未知參數(shù),的估計(jì),自適應(yīng)動(dòng)態(tài)滑?？刂破鞯脑O(shè)計(jì),滑動(dòng)模態(tài)方程為,(4.10),Thursday, August 13, 2020,The College of Information Science and

12、 Engineering,改進(jìn)的控制器的設(shè)計(jì),定義含不確定參數(shù)的狀態(tài),的觀測(cè)器為,其中,(4.11),(4.12),自適應(yīng)律為,(4.13),動(dòng)態(tài)滑模控制律,Thursday, August 13, 2020,The College of Information Science and Engineering,穩(wěn)定性分析,(4.14),(4.15),Thursday, August 13, 2020,The College of Information Science and Engineering,Buck變換器的自適應(yīng)動(dòng)態(tài)滑?？刂破?仿真研究,系統(tǒng)參數(shù)為,Thursday, August

13、13, 2020,The College of Information Science and Engineering,負(fù)載R=100,圖4.1 動(dòng)態(tài)滑?？刂戚敵鲭妷簒1 圖4.2 自適應(yīng)動(dòng)態(tài)滑模控制 的變化曲線 輸出電壓x1的變化曲線,Thursday, August 13, 2020,The College of Information Science and Engineering,圖4.3 輸出電壓x1的變化曲線 圖4.4 輸出電壓x1的變化曲線圖,負(fù)載R=1,負(fù)載R=10K,結(jié)論：負(fù)載變化時(shí)，自適應(yīng)動(dòng)態(tài)滑?？刂频膭?dòng)態(tài)性能明顯優(yōu)于 動(dòng)態(tài)滑?？刂疲岣吡讼到y(tǒng)對(duì)負(fù)載變動(dòng)的魯棒性,Thurs

14、day, August 13, 2020,The College of Information Science and Engineering,圖4.5 控制量d(t)的變化曲線,負(fù)載R=100,Thursday, August 13, 2020,The College of Information Science and Engineering,圖4.6 觀測(cè)器跟蹤誤差變化曲線,負(fù)載R=1,Thursday, August 13, 2020,The College of Information Science and Engineering,結(jié)論與展望,Thursday, August 13, 2020,The College of Information Science and Engineering,結(jié)論 改進(jìn)的自適應(yīng)積分滑?？刂破?，消除了Buck變換器輸出電壓的靜差，提高了輸出電壓的精度 。解決了設(shè)計(jì)中必須知道負(fù)載上界的約束，提高了負(fù)載變化時(shí)系統(tǒng)的性能。 動(dòng)態(tài)滑?？刂瓶梢允笲uck變換器中控制量的抖振大幅降低，但削弱抖振的同時(shí)也削弱了系統(tǒng)的魯棒性。 Buck變換器的自適應(yīng)動(dòng)態(tài)滑?？刂?，在削弱系統(tǒng)抖振的同時(shí)，有效彌補(bǔ)了