光伏微網(wǎng)柔性變流器并網(wǎng)運行混成控制研究
發(fā)布時間：2018-11-16 16:05
【摘要】：太陽能光伏發(fā)電由于資源豐富、分布廣泛、建設(shè)簡單、環(huán)境友好等優(yōu)點,大力發(fā)展光伏發(fā)電技術(shù)已漸漸為世界所共識。分布式光伏發(fā)電以微網(wǎng)形式接入主電網(wǎng)是提高其效能的最有效措施。由于光伏發(fā)電的隨機性與間歇性特征,光伏微網(wǎng)并網(wǎng)會出現(xiàn)各種電能質(zhì)量問題,因此,對光伏微網(wǎng)并網(wǎng)功率接口及其控制方法的研究成為了一個熱點課題。論文以并網(wǎng)柔性變流器為研究對象,開展光伏微網(wǎng)柔性變流器并網(wǎng)運行混成控制的理論和方法研究,不僅具有極其重要的學(xué)術(shù)意義,還且具有非常廣泛的應(yīng)用前景。首先,論文深入調(diào)研了光伏微網(wǎng)產(chǎn)生和發(fā)展的背景、概念以及國內(nèi)外發(fā)展現(xiàn)狀；綜述了微網(wǎng)常規(guī)并網(wǎng)功率接口及其一般控制方法；著重探索了柔性變流器理論的基本思想、分類、原理以及研究現(xiàn)狀,深入研究了并網(wǎng)柔性變流器基本拓撲與工作原理。其次,介紹了混成系統(tǒng)理論的概念、模型、分類、控制方法,詳細分析了光伏微網(wǎng)柔性變流器并網(wǎng)運行系統(tǒng)的混成特性,結(jié)合并網(wǎng)柔性變流器中三相全橋逆變器的工作模態(tài)和混成控制決策機制,建立了三相全橋逆變器的混成自動機模型,深入研究了并網(wǎng)柔性變流器的離散控制器和連續(xù)控制器的設(shè)計方法；最后,運用Matlab/Simulink軟件搭建了100kVA光伏微網(wǎng)并網(wǎng)運行系統(tǒng)的仿真模型,并針對系統(tǒng)不同的運行模式和工作情況進行了仿真分析。論文探索的光伏微網(wǎng)柔性變流器并網(wǎng)功率接口,是一種高性能的電力電子功率接口,具有根據(jù)光伏電源輸出容量或其他外部信息自主調(diào)節(jié)其輸出功能的能力；本文深入研究了光伏微網(wǎng)柔性變流器并網(wǎng)運行混成控制方法,能夠客觀、精細地描述光伏微網(wǎng)柔性變流器并網(wǎng)運行系統(tǒng)的連續(xù)特性、離散特征及其相互作用,設(shè)計的混成控制器集柔性并網(wǎng)變流器的功率控制、電能質(zhì)量控制、運行模式切換控制等多功能控制于一體,具有控制精度高、魯棒性強、實現(xiàn)容易等優(yōu)勢。仿真結(jié)果驗證了其正確性、有效性和可行性。
[Abstract]:Due to the advantages of abundant resources, wide distribution, simple construction and friendly environment, the development of solar photovoltaic power generation technology has gradually become a common understanding in the world. The most effective way to improve the efficiency of distributed photovoltaic power generation is to connect it to the main grid in the form of microgrid. Because of the randomness and intermittency of photovoltaic power generation, there will be a variety of power quality problems in grid-connected photovoltaic microgrid. Therefore, the research on the grid-connected power interface and its control methods of photovoltaic microgrid has become a hot topic. This paper takes the grid-connected flexible converter as the research object, carries out the research on the theory and method of grid-connected hybrid control of photovoltaic microgrid flexible converter, which not only has extremely important academic significance, but also has a very wide application prospect. Firstly, the background, concept and status quo of photovoltaic microgrid generation and development are investigated, and the conventional grid-connected power interface and its control methods are summarized. The basic idea, classification, principle and research status of flexible converter theory are emphatically explored, and the basic topology and working principle of grid-connected flexible converter are deeply studied. Secondly, the concept, model, classification, control method of hybrid system theory are introduced, and the hybrid characteristics of photovoltaic microgrid flexible converter grid-connected operation system are analyzed in detail. Combined with the mode of three-phase full-bridge inverter and the decision-making mechanism of hybrid control in grid-connected flexible converter, a hybrid automaton model of three-phase full-bridge inverter is established. The design methods of discrete controller and continuous controller of grid-connected flexible converter are studied. Finally, the simulation model of 100kVA photovoltaic microgrid operation system is built by using Matlab/Simulink software, and the different operation modes and working conditions of the system are simulated and analyzed. The grid-connected power interface of photovoltaic microgrid flexible converter is a high performance power interface of power electronics. It has the ability to adjust its output function according to the output capacity of photovoltaic power supply or other external information. In this paper, the hybrid control method for grid-connected flexible photovoltaic converters is studied, which can describe the continuous characteristics, discrete characteristics and interaction of grid-connected flexible photovoltaic converters objectively and accurately. The designed hybrid controller integrates the power control, power quality control and operation mode switching control of the flexible grid-connected converter. It has the advantages of high control precision, strong robustness and easy implementation. The simulation results show that it is correct, effective and feasible.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM615;TM46
本文編號：2335966
[Abstract]:Due to the advantages of abundant resources, wide distribution, simple construction and friendly environment, the development of solar photovoltaic power generation technology has gradually become a common understanding in the world. The most effective way to improve the efficiency of distributed photovoltaic power generation is to connect it to the main grid in the form of microgrid. Because of the randomness and intermittency of photovoltaic power generation, there will be a variety of power quality problems in grid-connected photovoltaic microgrid. Therefore, the research on the grid-connected power interface and its control methods of photovoltaic microgrid has become a hot topic. This paper takes the grid-connected flexible converter as the research object, carries out the research on the theory and method of grid-connected hybrid control of photovoltaic microgrid flexible converter, which not only has extremely important academic significance, but also has a very wide application prospect. Firstly, the background, concept and status quo of photovoltaic microgrid generation and development are investigated, and the conventional grid-connected power interface and its control methods are summarized. The basic idea, classification, principle and research status of flexible converter theory are emphatically explored, and the basic topology and working principle of grid-connected flexible converter are deeply studied. Secondly, the concept, model, classification, control method of hybrid system theory are introduced, and the hybrid characteristics of photovoltaic microgrid flexible converter grid-connected operation system are analyzed in detail. Combined with the mode of three-phase full-bridge inverter and the decision-making mechanism of hybrid control in grid-connected flexible converter, a hybrid automaton model of three-phase full-bridge inverter is established. The design methods of discrete controller and continuous controller of grid-connected flexible converter are studied. Finally, the simulation model of 100kVA photovoltaic microgrid operation system is built by using Matlab/Simulink software, and the different operation modes and working conditions of the system are simulated and analyzed. The grid-connected power interface of photovoltaic microgrid flexible converter is a high performance power interface of power electronics. It has the ability to adjust its output function according to the output capacity of photovoltaic power supply or other external information. In this paper, the hybrid control method for grid-connected flexible photovoltaic converters is studied, which can describe the continuous characteristics, discrete characteristics and interaction of grid-connected flexible photovoltaic converters objectively and accurately. The designed hybrid controller integrates the power control, power quality control and operation mode switching control of the flexible grid-connected converter. It has the advantages of high control precision, strong robustness and easy implementation. The simulation results show that it is correct, effective and feasible.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM615;TM46
【參考文獻】
相關(guān)期刊論文 前1條
1 楊晨;謝少軍;毛玲;秦嶺;;基于雙管Buck-Boost變換器的直流微電網(wǎng)光伏接口控制分析[J];電力系統(tǒng)自動化;2012年13期
，本文編號：2335966
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