【摘要】：混沌振蕩是非線性系統(tǒng)中各參數(shù)相互作用導致的一種非常復雜的現(xiàn)象,電力系統(tǒng)是一個典型的非線性系統(tǒng),在周期性擾動的負荷下或當系統(tǒng)參數(shù)滿足一定條件時會產生混沌振蕩,這種持續(xù)無規(guī)則的振蕩可能導致系統(tǒng)失穩(wěn),嚴重危害系統(tǒng)的安全運行。因此,分析電力系統(tǒng)混沌振蕩的機理特性和抑制策略具有重要的基礎意義與應用價值。首先,本文分析總結了互聯(lián)雙機電力系統(tǒng)產生混沌振蕩的機理特征和參數(shù)條件;其次,對該混沌系統(tǒng)設計了包含雙曲切換項的雙曲滑�？刂破�,并從理論上分析和證明了該控制器的穩(wěn)定性和收斂精度;第三,基于分數(shù)階控制理論,設計了分數(shù)階雙曲滑�？刂破�,并進行了該控制器理論穩(wěn)定性的驗證;最后,對于產生混沌振蕩的互聯(lián)雙機電力系統(tǒng),進行了兩種控制器分別作用下的仿真實驗。仿真結果表明,和傳統(tǒng)滑�？刂浦胁贿B續(xù)的切換項相比,雙曲滑�？刂破髦羞B續(xù)光滑的雙曲切換項可以柔化滑�？刂破鞯妮敵�,并改善傳統(tǒng)滑模變結構控制中的“抖振”現(xiàn)象,而通過分數(shù)階滑模面和分數(shù)階雙曲切換項的設計,可進一步提高控制器輸出的平穩(wěn)性并加快系統(tǒng)向滑模面的趨近速度。
[Abstract]:Chaotic oscillation is a very complex phenomenon caused by the interaction of various parameters in nonlinear system. Power system is a typical nonlinear system. Chaotic oscillations will occur under the load of periodic disturbances or when the system parameters meet certain conditions. This kind of continuous and irregular oscillation may lead to the instability of the system and seriously endanger the safe operation of the system. Therefore, it is of fundamental significance and application value to analyze the mechanism and suppression strategy of chaotic oscillation in power system. Firstly, the mechanism characteristics and parameter conditions of chaotic oscillation in interconnected two-machine power system are analyzed and summarized in this paper. Secondly, the hyperbolic sliding mode controller with hyperbolic switching term is designed for the chaotic system, and the stability and convergence accuracy of the controller are analyzed and proved theoretically. Thirdly, based on the fractional order control theory, a fractional hyperbolic sliding mode controller is designed, and the theoretical stability of the controller is verified. Finally, the simulation experiments of interconnected two-machine power system with chaotic oscillation are carried out under the action of two kinds of controllers. The simulation results show that compared with the discontinuous switching term in the traditional sliding mode control, the continuous smooth hyperbolic switching term in the hyperbolic sliding mode controller can soften the output of the sliding mode controller and improve the "buffeting" phenomenon in the traditional sliding mode variable structure control. Through the design of fractional sliding mode surface and fractional hyperbolic switching term, the output stability of controller can be further improved and the system approach to sliding mode surface can be accelerated.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM712

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