【摘要】：近幾年,隨著科技的發(fā)展,社會(huì)的進(jìn)步,能源緊缺問(wèn)題越來(lái)越受到人們的重視。開發(fā)新能源成為了當(dāng)今的熱門話題。新能源是一種非常規(guī)的能源,傳統(tǒng)能源外的能源,如太陽(yáng)能、風(fēng)能、地?zé)崮堋⒑Ｑ竽艿�。而其中太�?yáng)能是一種清潔和可再生能源,太陽(yáng)能的開發(fā)和利用將有助于緩解目前的能源危機(jī)和環(huán)境危機(jī)。而光伏并網(wǎng)發(fā)電系統(tǒng)能夠?qū)⑻?yáng)能轉(zhuǎn)換成電能,它是非常有效的太陽(yáng)能利用方式。而逆變技術(shù)是光伏發(fā)電系統(tǒng)中的必備技術(shù),每塊光伏組件都對(duì)應(yīng)有微型光伏并網(wǎng)逆變器,可以有效的提高并網(wǎng)的效率。因此研究微型光伏逆變器是很有價(jià)值的。本文首先對(duì)微型逆變器的具體結(jié)構(gòu)、微型逆變器的特點(diǎn)進(jìn)行了介紹。再針對(duì)微型光伏逆變器進(jìn)行了研究,分析了國(guó)內(nèi)外微型光伏逆變器的研究現(xiàn)狀以及其拓?fù)浣Y(jié)構(gòu),給出了一種比較合適、高效的逆變器電路結(jié)構(gòu)。詳細(xì)的闡述了逆變器的并網(wǎng)控制器的方式,對(duì)各種控制方式進(jìn)行了分析,提出了一種新的逆變器的控制方式。然后對(duì)逆變器的電路進(jìn)行分析,闡述其工作原理,并建立了逆變器的數(shù)學(xué)模型。再對(duì)逆變器中的變壓器參數(shù)、輸入輸出電容的參數(shù)進(jìn)行計(jì)算,建立了逆變器matlab/simulink仿真模型,并針對(duì)前級(jí)輸入電流設(shè)計(jì)了逆變器的控制器。為了提高微型逆變器的并網(wǎng)效率,對(duì)微型逆變器的仿真模型進(jìn)行了改進(jìn),對(duì)逆變器的兩路電流進(jìn)行檢測(cè),從而建立了matlab/simulink雙電流控制模型,驗(yàn)證了其可行性。由于PI控制不能有效的抑制諧波,尤其是對(duì)過(guò)零點(diǎn)處的諧波,因此本文提出PI多諧振的控制方式。根據(jù)根軌跡法來(lái)確定PI多諧振控制器的各個(gè)參數(shù),并通過(guò)仿真進(jìn)行了驗(yàn)證。還對(duì)不同的控制方法進(jìn)行了研究,進(jìn)行了仿真,并且進(jìn)行了比較分析。建立了準(zhǔn)諧振控制器、多諧振控制器、PI諧振控制器作用下的仿真模型,并對(duì)仿真結(jié)果的并網(wǎng)電流的THD值進(jìn)行分析。最后本文根據(jù)逆變器的主電路拓?fù)浣Y(jié)構(gòu),設(shè)計(jì)了一款微型光伏逆變器的硬件電路,對(duì)逆變器的控制電路和各個(gè)部分的驅(qū)動(dòng)電路進(jìn)行了詳細(xì)的介紹。按照逆變器的整體結(jié)構(gòu),以供電電路、輸入輸出電路、檢測(cè)電路、控制電路等形式,對(duì)其整體功能進(jìn)行詳細(xì)的說(shuō)明。還對(duì)控制芯片的功能分布進(jìn)行了分析,對(duì)逆變器的硬件工作原理進(jìn)行了闡述。
[Abstract]:In recent years, with the development of science and technology and social progress, energy shortage has been paid more and more attention. The development of new energy has become a hot topic today. New energy is an unconventional energy, traditional energy sources, such as solar, wind, geothermal, oceanic energy and so on. Solar energy is a kind of clean and renewable energy, the development and utilization of solar energy will help to alleviate the current energy crisis and environmental crisis. Photovoltaic grid-connected power generation system can convert solar energy into electric energy, it is a very effective way to use solar energy. The inverter technology is a necessary technology in photovoltaic power generation system. Each photovoltaic module has a miniature photovoltaic grid-connected inverter, which can effectively improve the efficiency of grid-connected. So it is very valuable to study the miniature photovoltaic inverter. In this paper, the structure of the micro inverter and the characteristics of the micro inverter are introduced. The research status and topology of miniature photovoltaic inverter at home and abroad are analyzed, and a more suitable and efficient inverter circuit structure is given. The mode of grid-connected controller of inverter is described in detail, various control modes are analyzed, and a new control mode of inverter is proposed. Then the circuit of the inverter is analyzed, the working principle of the inverter is expounded, and the mathematical model of the inverter is established. Then the transformer parameters and the input / output capacitance parameters of the inverter are calculated, the matlab/simulink simulation model of the inverter is established, and the inverter controller is designed for the former stage input current. In order to improve the grid-connection efficiency of the micro-inverter, the simulation model of the micro-inverter is improved, the two-channel current of the inverter is detected, and the dual-current control model of matlab/simulink is established, which verifies its feasibility. Because PI control can not suppress harmonics effectively, especially for the harmonics at zero crossing point, the PI multi-resonance control method is proposed in this paper. According to the root locus method, the parameters of PI multi-resonance controller are determined and verified by simulation. Different control methods are studied, simulated and compared. The simulation model of quasi-resonant controller, multi-resonance controller and PI resonant controller is established, and the THD value of grid-connected current of simulation results is analyzed. Finally, according to the topology of the main circuit of the inverter, a hardware circuit of the miniature photovoltaic inverter is designed. The control circuit of the inverter and the driving circuit of each part are introduced in detail. According to the whole structure of the inverter, the whole function of the inverter is explained in detail in the form of power supply circuit, input and output circuit, detection circuit, control circuit and so on. The function distribution of the control chip is also analyzed, and the working principle of the inverter hardware is expounded.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李鵬飛;;光伏并網(wǎng)微型逆變器的分析[J];科技創(chuàng)新與應(yīng)用;2013年26期

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本文編號(hào)：2321579