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

【摘要】：本文將混合系統(tǒng)理論應(yīng)用到微電網(wǎng),由于微電網(wǎng)中存在大量的開關(guān)器件,開關(guān)的切換使得微電網(wǎng)表現(xiàn)為連續(xù)動(dòng)態(tài)和離散切換事件之間的混合行為,因此微電網(wǎng)是一個(gè)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(wǎng),為微電網(wǎng)設(shè)計(jì)了混合控制方案,并研究了微電網(wǎng)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(jìn)展、本文的研究目的及意義、微電網(wǎng)的概念及控制方法以及本文將用到的穩(wěn)定性基礎(chǔ)知識(shí)。其次本文將區(qū)間脈沖系統(tǒng)理論應(yīng)用到微電網(wǎng),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(jià)條件定理;將上述結(jié)果應(yīng)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(jià)條件的定理;最后將前述結(jié)果應(yīng)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(jià)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(huì)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(shè)計(jì)了一個(gè)區(qū)間脈沖切換控制系統(tǒng),并研究了負(fù)載擾動(dòng)和孤島擾動(dòng)兩種外在輸入情況下微電網(wǎng)儲(chǔ)能系統(tǒng)的輸入到狀態(tài)穩(wěn)定,通過仿真實(shí)驗(yàn),系統(tǒng)在這兩種情況下均達(dá)到了輸入到狀態(tài)穩(wěn)定。最后研究了含多個(gè)分布式電源微電網(wǎng)系統(tǒng)穩(wěn)定性,以脈沖系統(tǒng)理論對(duì)微電網(wǎng)進(jìn)行建模,為了提升微電網(wǎng)并網(wǎng)狀態(tài)切換到孤島狀態(tài)時(shí)的穩(wěn)定性,設(shè)計(jì)了一個(gè)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(gè)分布式電源,本地控制器的設(shè)計(jì)是基于李雅普洛夫理論的線性矩陣不等式技術(shù),通過調(diào)整分布式電源子系統(tǒng)的設(shè)定點(diǎn),使其達(dá)到最好的性能和合適的運(yùn)行指數(shù);第二層是通過分散監(jiān)控控制進(jìn)行協(xié)調(diào),分散監(jiān)控控制是建立在信息融合基礎(chǔ)上,也就是使用廣域測(cè)量系統(tǒng),在有大的擾動(dòng)情況下轉(zhuǎn)換分布式電源子系統(tǒng)進(jìn)入一個(gè)合適的運(yùn)轉(zhuǎn)狀態(tài)。然后將前述的混合控制應(yīng)用到一個(gè)10k V微電網(wǎng)中,研究了一個(gè)三相短路故障狀態(tài)下微電網(wǎng)的暫態(tài)反應(yīng)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(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM712

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊琦;馬世英;李勝;唐曉駿;李曉s，

本文編號(hào)：1888213