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時滯矩形廣義系統的混合H∞與無源控制

2020-05-20 15:05:18黎婕林崇劉煥霞
青島大學學報(工程技術版) 2020年2期

黎婕 林崇 劉煥霞

摘要:針對時滯矩形廣義系統的混合H∞與無源控制問題,本文通過構造帶時滯的動態補償器,利用實數域上正常廣義系統的可容許性判據,得到可使閉環系統在混合H∞與無源性能指標γ條件下容許的充分條件。通過構建合適的LyapunovKrasovskii泛函,結合放松過的Wirtinger不等式,對泛函導數積分項進行處理,將不等式中非線性項進行代換,最后通過數值算例驗證該方法的有效性,并將混合H∞與無源控制問題從正常廣義系統推廣到時滯矩形廣義系統。驗證結果表明,本文所得到的穩定性充分條件擁有更大的時滯上界,決策變量更少,保守性和復雜度更低。該研究對時滯矩形廣義系統的穩定性分析與控制器設計問題具有重要意義。

關鍵詞:矩形廣義系統; 混合H∞與無源控制; 時滯; 動態補償

中圖分類號: TP13; N941.1 文獻標識碼: A

文章編號: 10069798(2020)02000108; DOI: 10.13306/j.10069798.2020.02.001

廣義系統,又稱廣義狀態空間系統,與常規系統相比,可以更好地描述物理系統,因而一直受到廣泛研究和關注[12]。而矩形廣義系統,作為一類更廣泛的廣義系統,由于狀態變量個數與狀態方程個數不一致,因而具有更復雜的行為[3]。從20世紀80年代末開始,矩形廣義系統開始受到關注,很多學者著手研究矩形系統的正則性及廣義正則化問題[34],矩形廣義系統脈沖能控性、能觀性問題[56],以及濾波、估計問題和觀測器設計問題等[79]。Zhang G S等人[1011]首次提出用動態補償方法使閉環矩形廣義系統正則化;Chen J等人[12]設計了矩形TS模糊離散系統的時滯動態補償器;Zhang X F等人[1314]又將矩形廣義系統相關理論延伸到分數階領域。由于時滯存在于許多動力系統中,經常導致性能不佳和不穩定,因此研究時滯矩形廣義系統的穩定性具有重要的理論和現實意義。近年來,隨著線性矩陣不等式(linear matrix inequality,LMI)方法的發展,許多學者對各種系統的H∞控制問題進行了廣泛研究[1516]。Xu S等人[1718]對連續和離散時間時滯系統的耗散進行分析和設計;Wu Z G等人[1920]討論了連續和離散時滯廣義系統的混合H∞與無源濾波問題;Chen J等人[21]研究了時滯廣義系統的混合H∞與無源控制問題。針對時滯矩形廣義系統的混合H∞與無源控制問題,目前還沒有學者對其作相應的研究。基于此,本文將正常廣義系統推廣到時滯矩形廣義系統,并利用帶時滯的動態補償器,得到在混合H∞與無源性能指標γ下使閉環系統容許的充分條件,實現了混合H∞與無源控制,并通過數值例子驗證了本文結果有效性。該研究為時滯矩形廣義系統的穩定性提供了理論依據。

5 結束語

本文針對時滯矩形廣義系統設計了一類動態補償器來實現閉環系統的混合H∞與無源性能控制問題。在文獻[21]的基礎上,首次把混合H∞與無源控制問題推廣到矩形廣義系統中,并利用動態補償器實現了系統的漸近穩定。與文獻[21]相比,本文方法引入了新的自由權矩陣,并采用一種有效算法來計算控制器增益矩陣,所得結果擁有更大的時滯上限,決策變量更少,保守性更低,數值算例證明了該結果的有效性。另外,本文是在文獻[27]針對矩形廣義系統鎮定問題的研究基礎上,進一步考慮了帶時滯的矩形廣義系統的控制問題。這類問題目前研究成果并不多,將其與實際生產模型相結合可以作為進一步研究的方向。

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Mixed H∞ and Passive Control for Stabilization for Time-Delay Rectangular Descriptor Systems

LI Jie, LIN Chong, LIU Huanxia

(Institute of Complexity Science, Qingdao University, Qingdao 266071, China)

Abstract:? Aiming at the problem of mixed H∞ and passive control for time-delay rectangular descriptor systems, this paper constructs a dynamic compensator with time delay and uses the admissibility criterion of a normal singular system to obtain sufficient conditions under mixed H∞ and passive performance index γ requirements. Firstly, a suitable Lyapunov-Krasovskii functional is constructed in this paper. Then, the derivative term of the functional derivative is processed in combination with the relaxed Wirtinger inequality, and then the non-linear term in the inequality is replaced. Finally, numerical example verifies the validity of the method. In this paper, the mixed H∞ and passive control problem is extended from a normal singular system to a rectangular descriptor system with time delay. The verification results show that the method in this paper has a larger upper bound on time delay, fewer decision variables, and lower conservatism and complexity than the sufficient stability conditions obtained by the existing results. This research is of great significance to the stability analysis and controller design of rectangular descriptor systems with time delay.

Key words:? rectangular descriptor systems; mixed H∞ and passive control; time delay; dynamic compensation

收稿日期: 2019-12-02; 修回日期: 2020-02-4

基金項目:國家自然科學基金資助項目(61673227,61873137)

作者簡介:黎婕(1995-,女,碩士研究生,主要研究方向為矩形廣義系統的分析與控制。

通信作者:林崇(1967-),男,博士,教授,碩士生導師,主要研究方向為系統理論與控制理論。 Email: linchong_2004@hotmail.com

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