兩級式光伏并網逆變器混沌行為分析及其控制研究
發(fā)布時間：2018-09-19 13:12
【摘要】：太陽能光伏發(fā)電,簡稱太陽能光電,是利用太陽電池將太陽能直接轉化為電能的發(fā)電方式,也是現階段對太陽能進行合理利用的一種重要形式。作為最具潛力的“未來能源”,太陽能光伏技術成為各國研究的焦點。光伏并網逆變器(Photovoltaic grid-connected inverter,簡寫PVGCI)作為整個能量裝換系統(tǒng)的重要組成部分,其穩(wěn)定性顯得格外重要。因此,研究并網逆變器中的混沌行為并同時給出有針對性的混沌保護控制策略,對電網的安全穩(wěn)定運行具有十分重要的意義。本文針對兩級式光伏逆變系統(tǒng)中的分岔、混沌行為進行了相關的分析和研究,具體工作概括如下:(1)分析了本課題的研究背景與意義,對國內外的混沌控制和電力電子變換器混沌控制研究現狀進行了綜述,進一步指出本課題的研究意義,給出本課題的研究目標與內容。(2)在研究PVGCI主電路拓撲構造及其工作原理的基礎上,根據KVL、KCL建立PVGCI的狀態(tài)方程。并對PVGCI的混沌現象進行研究和分析,確定產生混沌行為的條件和出現混沌行為時的參數閾值。(3)根據PVGCI狀態(tài)方程參數較多,構造比較復雜這一特點,基于改善狀態(tài)關聯性理論設計混沌控制器,實現對PVGCI的混沌控制。該控制策略只改變狀態(tài)變量關聯系數,優(yōu)點是控制量比較少,設計直接簡便易于實現。(4)基于狀態(tài)反饋和參數擾動方法設計控制器,通過給相關的狀態(tài)變量加入狀態(tài)反饋,實現了對PVGCI混沌行為的控制,同時能夠使輸出并網電流的頻率、相位與公共電網達到同步狀態(tài)。由于該控制策略屬于閉環(huán)控制,受系統(tǒng)內部參數影響較小,在對系統(tǒng)進行控制的過程中具有較好的魯棒性,不需要事先設定預期控制目標,就能夠達到期望控制效果。(5)基于LaSalle不變集定理設計控制器,對PVGCI的混沌行為進行控制。該控制策略不必提前知道平衡點的位置,同時也不需要相關系統(tǒng)狀態(tài)變量以外的任何有關被控系統(tǒng)的信息,系統(tǒng)原有的結構也不需要做出改變,就能夠實現對系統(tǒng)的控制。根據該控制策略設計的控制器的設計簡單,易于實現和控制。最后,對本文的研究進行總結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.
【學位授予單位】：廣西師范大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM615;TM464
[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.
【學位授予單位】：廣西師范大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM615;TM464
【參考文獻】
相關期刊論文 前10條
1 汪慕峰;韋篤取;羅曉曙;張波;;基于有限時間穩(wěn)定理論的無刷直流電動機混沌振蕩控制[J];振動與沖擊;2016年13期
2 賈美美;張國山;;電壓控制型Buck變換器的混沌控制[J];電子科技大學學報;2016年02期
3 廖志賢;羅曉曙;黃國現;;兩級式光伏并網逆變器建模與非線性動力學行為研究[J];物理學報;2015年13期
4 洪慶輝;劉奇能;李志軍;曾以成;;LC振蕩型憶阻混沌電路及時滯反饋控制[J];控制理論與應用;2015年03期
5 楊益飛;駱敏舟;邢紹邦;韓曉新;朱q，
本文編號：2250228
本文鏈接：http://sikaile.net/kejilunwen/dianlidianqilunwen/2250228.html
