【摘要】：太陽能光伏發(fā)電,簡(jiǎn)稱太陽能光電,是利用太陽電池將太陽能直接轉(zhuǎn)化為電能的發(fā)電方式,也是現(xiàn)階段對(duì)太陽能進(jìn)行合理利用的一種重要形式。作為最具潛力的“未來能源”,太陽能光伏技術(shù)成為各國(guó)研究的焦點(diǎn)。光伏并網(wǎng)逆變器(Photovoltaic grid-connected inverter,簡(jiǎn)寫PVGCI)作為整個(gè)能量裝換系統(tǒng)的重要組成部分,其穩(wěn)定性顯得格外重要。因此,研究并網(wǎng)逆變器中的混沌行為并同時(shí)給出有針對(duì)性的混沌保護(hù)控制策略,對(duì)電網(wǎng)的安全穩(wěn)定運(yùn)行具有十分重要的意義。本文針對(duì)兩級(jí)式光伏逆變系統(tǒng)中的分岔、混沌行為進(jìn)行了相關(guān)的分析和研究,具體工作概括如下:(1)分析了本課題的研究背景與意義,對(duì)國(guó)內(nèi)外的混沌控制和電力電子變換器混沌控制研究現(xiàn)狀進(jìn)行了綜述,進(jìn)一步指出本課題的研究意義,給出本課題的研究目標(biāo)與內(nèi)容。(2)在研究PVGCI主電路拓?fù)錁?gòu)造及其工作原理的基礎(chǔ)上,根據(jù)KVL、KCL建立PVGCI的狀態(tài)方程。并對(duì)PVGCI的混沌現(xiàn)象進(jìn)行研究和分析,確定產(chǎn)生混沌行為的條件和出現(xiàn)混沌行為時(shí)的參數(shù)閾值。(3)根據(jù)PVGCI狀態(tài)方程參數(shù)較多,構(gòu)造比較復(fù)雜這一特點(diǎn),基于改善狀態(tài)關(guān)聯(lián)性理論設(shè)計(jì)混沌控制器,實(shí)現(xiàn)對(duì)PVGCI的混沌控制。該控制策略只改變狀態(tài)變量關(guān)聯(lián)系數(shù),優(yōu)點(diǎn)是控制量比較少,設(shè)計(jì)直接簡(jiǎn)便易于實(shí)現(xiàn)。(4)基于狀態(tài)反饋和參數(shù)擾動(dòng)方法設(shè)計(jì)控制器,通過給相關(guān)的狀態(tài)變量加入狀態(tài)反饋,實(shí)現(xiàn)了對(duì)PVGCI混沌行為的控制,同時(shí)能夠使輸出并網(wǎng)電流的頻率、相位與公共電網(wǎng)達(dá)到同步狀態(tài)。由于該控制策略屬于閉環(huán)控制,受系統(tǒng)內(nèi)部參數(shù)影響較小,在對(duì)系統(tǒng)進(jìn)行控制的過程中具有較好的魯棒性,不需要事先設(shè)定預(yù)期控制目標(biāo),就能夠達(dá)到期望控制效果。(5)基于LaSalle不變集定理設(shè)計(jì)控制器,對(duì)PVGCI的混沌行為進(jìn)行控制。該控制策略不必提前知道平衡點(diǎn)的位置,同時(shí)也不需要相關(guān)系統(tǒng)狀態(tài)變量以外的任何有關(guān)被控系統(tǒng)的信息,系統(tǒng)原有的結(jié)構(gòu)也不需要做出改變,就能夠?qū)崿F(xiàn)對(duì)系統(tǒng)的控制。根據(jù)該控制策略設(shè)計(jì)的控制器的設(shè)計(jì)簡(jiǎn)單,易于實(shí)現(xiàn)和控制。最后,對(duì)本文的研究進(jìn)行總結(jié)并指出接下來工作主要方向。
[Abstract]:Solar photovoltaic power generation, referred to as solar photovoltaic, is the use of solar cells to directly convert solar energy into electricity generation mode, but also is an important form of reasonable use of solar energy at this stage. As the most potential "future energy", solar photovoltaic technology has become the focus of research around the world. Photovoltaic grid-connected inverter (Photovoltaic grid-connected inverter, PVGCI) as an important part of the whole energy switching system, its stability is particularly important. Therefore, it is of great significance to study the chaotic behavior of grid-connected inverter and to give the corresponding chaotic protection and control strategy for the safe and stable operation of power grid. In this paper, the bifurcation and chaotic behavior of two-stage photovoltaic inverter system are analyzed and studied. The specific work is summarized as follows: (1) the research background and significance of this subject are analyzed. The research status of chaos control and power electronic converter at home and abroad is summarized, and the significance of this research is pointed out. The research objectives and contents of this paper are given. (2) on the basis of studying the topology construction and working principle of PVGCI main circuit, the state equation of PVGCI is established according to KVL,KCL. The chaotic phenomena of PVGCI are studied and analyzed, and the conditions for the chaotic behavior and the threshold of the chaotic behavior are determined. (3) according to the characteristics of the PVGCI equation of state with more parameters, the structure is more complicated. Chaotic controller is designed based on improved state correlation theory to control chaos in PVGCI. This control strategy only changes the correlation coefficient of state variables, which has the advantages of less control quantity, simple and easy design. (4) based on the method of state feedback and parameter perturbation, the controller is designed by adding state feedback to the relevant state variables. The chaotic behavior of PVGCI is controlled, and the frequency and phase of the output grid-connected current are synchronized with the public power grid. Because the control strategy belongs to the closed-loop control and is less affected by the internal parameters of the system, it has good robustness in the process of controlling the system, and it does not need to set the expected control target in advance. The desired control effect can be achieved. (5) based on the LaSalle invariant set theorem, a controller is designed to control the chaotic behavior of PVGCI. The control strategy does not need to know the position of the equilibrium point in advance, and also does not need any information about the controlled system other than the related system state variables, and the original structure of the system does not need to be changed, so the control of the system can be realized. The controller designed according to the control strategy is simple and easy to realize and control. Finally, this paper summarizes the research and points out the main direction of the next work.
【學(xué)位授予單位】：廣西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM615;TM464

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本文編號(hào)：2250228