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  本文選題：Z源逆變器　切入點：光伏并網(wǎng)　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

【摘要】：伴隨著社會經(jīng)濟的快速發(fā)展,各國對于能源的需求越來越迫切�；茉聪拇M,將難以維持人類社會發(fā)展的可持續(xù)性,因此尋找新能源取代化石能源顯得尤為重要。太陽能由于無污染、易獲取、取之不盡等特點而獲得人們的廣泛關注。目前利用太陽能發(fā)電主要包括光伏發(fā)電和光熱發(fā)電。光伏發(fā)電由于具有較高的能量利用率而成為學者研究的重要課題。本文采用Z源逆變器來取代傳統(tǒng)光伏并網(wǎng)系統(tǒng)結構當中的DC/DC變換電路和逆變器,對于Z源逆變器及其在光伏并網(wǎng)系統(tǒng)中的應用進行了相關的研究。本文首先介紹了Z源逆變器的工作原理以及常見的調(diào)制策略,在此基礎上分析直通零矢量對于Z源逆變器電感電流紋波的影響,進而提出一種改進的Z源調(diào)制策略。該調(diào)制策略相較于傳統(tǒng)的調(diào)制策略可以更有效地減小Z源逆變器的Z源電感電流紋波和Z源電容電壓紋波,進而提高Z源逆變器輸出交流波形的質(zhì)量。其次,本文介紹了常見的Z源逆變器拓撲結構及其特點。在傳統(tǒng)拓撲結構研究的基礎上,引入一種開關耦合電感單元,來取代傳統(tǒng)拓撲結構中的電感,進而使得Z源逆變器電壓增益能力得到明顯加強。這為Z源逆變器如何提高電壓增益能力提供了一種新方法,并且該方法對于光伏發(fā)電、風力發(fā)電等輸入電壓小、電壓增益要求高的場合具有廣泛的應用價值。再者,本文采用狀態(tài)空間平均法對Z源逆變器建模,并介紹了兩種常見的基于Z源逆變器的光伏并網(wǎng)系統(tǒng)控制策略,即Z源電容電壓恒壓控制策略和基于電壓空間矢量的單級控制策略。本文以Z源電容電壓恒壓控制策略為基礎,利用MATLAB搭建了光伏并網(wǎng)系統(tǒng)的仿真。最后,本文設計了功率為2kW的基于Z源逆變器的光伏并網(wǎng)系統(tǒng)實驗平臺。在這個過程中,介紹了主電路中的電感、電容、開關管等參數(shù)選取依據(jù);設計了相關的硬件電路,主要包括電壓電流檢測電路、過零檢測電路、IGBT驅動電路;以控制芯片TMS320F28335為基礎進行了軟件的設計,主要包括主程序、AD中斷程序、頻率捕獲和網(wǎng)壓同步中斷程序、EPWM中斷程序和故障中斷程序的設計。最后,通過實驗調(diào)試得到了相應的實驗波形,實驗結果表明基于Z源逆變器光伏并網(wǎng)系統(tǒng)實現(xiàn)了升壓和并網(wǎng)的功能。
[Abstract]:With the rapid development of social economy, the demand for energy is becoming more and more urgent. Fossil energy consumption will be difficult to maintain the sustainability of human social development. So it's particularly important to find new sources of energy instead of fossil fuels. Solar energy is easy to access because it's pollution-free. At present, solar power generation mainly includes photovoltaic power generation and photothermal power generation. Photovoltaic power generation has become an important topic for scholars because of its high energy efficiency. In this paper, Z-source inverter is used to replace the DC/DC converter and inverter in the traditional photovoltaic grid-connected system. The Z-source inverter and its application in photovoltaic grid-connected system are studied. Firstly, the principle of Z-source inverter and its modulation strategy are introduced. On the basis of this, the effect of zero-pass vector on current ripple of Z-source inverter is analyzed. Furthermore, an improved Z-source modulation strategy is proposed, which can reduce the current ripple of the Z-source inductor and the voltage ripple of the Z-source capacitor more effectively than the traditional modulation strategy. Then the quality of the output AC waveform of Z-source inverter is improved. Secondly, the common topology and characteristics of Z-source inverter are introduced. Based on the research of traditional topology, a switching coupled inductance unit is introduced. It provides a new method for how to improve the voltage gain ability of Z-source inverter, and it is also useful for photovoltaic power generation. Wind power generation, such as small input voltage and high voltage gain, has wide application value. Furthermore, the state space averaging method is used to model the Z-source inverter. Two common control strategies of photovoltaic grid-connected system based on Z-source inverter, Z source capacitor voltage constant voltage control strategy and single stage control strategy based on voltage space vector, are introduced in this paper, which is based on Z-source capacitor voltage constant voltage control strategy. The simulation of photovoltaic grid-connected system is built by using MATLAB. Finally, a 2kW experimental platform of photovoltaic grid-connected system based on Z-source inverter is designed. In this process, the inductance and capacitance of the main circuit are introduced. The related hardware circuits are designed, including voltage and current detection circuit, zero-crossing detection circuit and IGBT-driven circuit. The software is designed based on the control chip TMS320F28335. It mainly includes the design of main program AD interrupt program, frequency capture and network voltage synchronous interrupt program EPWM interrupt program and fault interrupt program. Finally, the corresponding experimental waveform is obtained through experimental debugging. The experimental results show that the photovoltaic grid-connected system based on Z-source inverter achieves the functions of boosting and grid-connected.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM464;TM615

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