發(fā)布時間：2018-05-14 14:23

  本文選題：混合系統(tǒng) + 微電網��； 參考：《湖南工業(yè)大學》2015年碩士論文

【摘要】：本文將混合系統(tǒng)理論應用到微電網,由于微電網中存在大量的開關器件,開關的切換使得微電網表現(xiàn)為連續(xù)動態(tài)和離散切換事件之間的混合行為,因此微電網是一個典型的混合系統(tǒng),本文主要以混合系統(tǒng)理論研究微電網,為微電網設計了混合控制方案,并研究了微電網的穩(wěn)定性。首先介紹了混合系統(tǒng)理論的研究背景及研究進展、本文的研究目的及意義、微電網的概念及控制方法以及本文將用到的穩(wěn)定性基礎知識。其次本文將區(qū)間脈沖系統(tǒng)理論應用到微電網,通過定義脈沖系統(tǒng)魯棒事件指數(shù)輸入到狀態(tài)穩(wěn)定,并給出了魯棒事件指數(shù)輸入到狀態(tài)穩(wěn)定性的等價條件定理;將上述結果應用到區(qū)間脈沖系統(tǒng)中,定義了區(qū)間脈沖系統(tǒng)指數(shù)輸入到狀態(tài)穩(wěn)定性,并給出了區(qū)間脈沖系統(tǒng)事件指數(shù)輸入到狀態(tài)穩(wěn)定性的等價條件的定理;最后將前述結果應用到區(qū)間脈沖切換系統(tǒng),并給出了區(qū)間脈沖切換系統(tǒng)魯棒指數(shù)輸入到狀態(tài)穩(wěn)定性的等價條件的定理。由之前的理論可知,如果限制不確定矩陣在較小的魯棒區(qū)域中,會增加它的衰減率,并且根據(jù)區(qū)間脈沖切換系統(tǒng)指數(shù)輸入到狀態(tài)穩(wěn)定性定理,為VSC設計了一個區(qū)間脈沖切換控制系統(tǒng),并研究了負載擾動和孤島擾動兩種外在輸入情況下微電網儲能系統(tǒng)的輸入到狀態(tài)穩(wěn)定,通過仿真實驗,系統(tǒng)在這兩種情況下均達到了輸入到狀態(tài)穩(wěn)定。最后研究了含多個分布式電源微電網系統(tǒng)穩(wěn)定性,以脈沖系統(tǒng)理論對微電網進行建模,為了提升微電網并網狀態(tài)切換到孤島狀態(tài)時的穩(wěn)定性,設計了一個兩層的混合控制策略:第一層是由連續(xù)的本地控制器控制每個分布式電源,本地控制器的設計是基于李雅普洛夫理論的線性矩陣不等式技術,通過調整分布式電源子系統(tǒng)的設定點,使其達到最好的性能和合適的運行指數(shù);第二層是通過分散監(jiān)控控制進行協(xié)調,分散監(jiān)控控制是建立在信息融合基礎上,也就是使用廣域測量系統(tǒng),在有大的擾動情況下轉換分布式電源子系統(tǒng)進入一個合適的運轉狀態(tài)。然后將前述的混合控制應用到一個10k V微電網中,研究了一個三相短路故障狀態(tài)下微電網的暫態(tài)反應穩(wěn)定性,通過simulink仿真,系統(tǒng)具有良好的暫態(tài)穩(wěn)定性。
[Abstract]:In this paper, the hybrid system theory is applied to microgrid. Due to the large number of switching devices in microgrid, switching between continuous dynamic and discrete switching events is the behavior of microgrid. Therefore, microgrid is a typical hybrid system. In this paper, the hybrid control scheme is designed based on the theory of hybrid system, and the stability of microgrid is studied. Firstly, the research background and research progress of hybrid system theory, the purpose and significance of this paper, the concept and control method of microgrid and the basic knowledge of stability will be introduced. Secondly, the interval impulsive system theory is applied to the micro-grid. By defining the robust event exponent input to the state stability, the equivalent condition theorem for the robust event exponent input to the state stability is given. Applying the above results to interval impulsive systems, the exponential input stability of interval impulsive systems is defined, and the equivalent conditions for the exponential input of interval impulsive systems to state stability are given. Finally, the above results are applied to interval impulsive switched systems, and the equivalent conditions for robust exponential input to state stability of interval impulsive switched systems are given. According to the previous theory, if the restricted uncertainty matrix is in a small robust region, it will increase its attenuation rate, and input into the state stability theorem according to the exponent of interval impulsive switched system. This paper designs an interval pulse switching control system for VSC, and studies the input stability of micro-grid energy storage system under two external input conditions: load disturbance and islanding disturbance. In both cases, the system achieves input state stability. Finally, the stability of microgrid system with multiple distributed power sources is studied. In order to improve the stability of microgrid when switching to the isolated island state, the pulse system theory is used to model the microgrid. A two-layer hybrid control strategy is designed. In the first layer, each distributed power source is controlled by a continuous local controller. The design of the local controller is based on the linear matrix inequality (LMI) technique based on the Lyapunov theory. By adjusting the setting point of the distributed power subsystem to achieve the best performance and proper operation index, the second layer is coordinated by decentralized monitoring control, which is based on information fusion. In other words, the wide area measurement system is used to convert the distributed power subsystem into a suitable operation state under the condition of large disturbance. Then, the hybrid control is applied to a 10kV microgrid, and the transient stability of the microgrid under a three-phase short-circuit fault is studied. Through simulink simulation, the system has good transient stability.
【學位授予單位】：湖南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM712

【參考文獻】

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1 楊琦;馬世英;李勝;唐曉駿;李曉s，

本文編號：1888213