【摘要】：近些年來,能源短缺與環(huán)境污染的問題已經(jīng)成為人們不可忽視的關(guān)注點。本論文從這兩個角度入手,闡述光伏發(fā)電技術(shù)研究的理論價值與現(xiàn)實意義。通過查閱大量文獻(xiàn)資料確定光伏并網(wǎng)逆變系統(tǒng)仍需進(jìn)一步研究的方面,進(jìn)而以提高并網(wǎng)逆變系統(tǒng)的運行穩(wěn)定性和入網(wǎng)電能質(zhì)量為目標(biāo)展開課題研究。論文首先對光伏并網(wǎng)發(fā)電系統(tǒng)的拓?fù)浣Y(jié)構(gòu)、分類以及相關(guān)技術(shù)進(jìn)行綜合分析,選取三相電壓型并網(wǎng)逆變系統(tǒng)作為論文的研究對象。分析三相電壓型逆變器的工作方式,闡述其工作原理;分析開關(guān)型逆變器中的高頻調(diào)制技術(shù),系統(tǒng)選用PWM調(diào)制;對比分析三種濾波器的優(yōu)缺點,確定LCL型濾波器為交流輸出濾波選擇。交流輸出濾波作為并網(wǎng)逆變系統(tǒng)的重要環(huán)節(jié),關(guān)系到入網(wǎng)電能質(zhì)量。論文詳細(xì)分析了LCL濾波器的工作原理,體現(xiàn)出LCL濾波器對并網(wǎng)電流的諧波成分具有很好的衰減能力。分析并網(wǎng)電流的傳輸特性與諧振現(xiàn)象,并研究抑制諧振尖峰的方法。然后逐步分析推導(dǎo),得出LCL濾波器各參數(shù)的選取范圍。針對LCL濾波的并網(wǎng)逆變系統(tǒng),建立其數(shù)學(xué)模型,并詳細(xì)分析研究該系統(tǒng)的電流閉環(huán)控制方案。針對電流單閉環(huán)控制的缺點,為了提高系統(tǒng)的運行穩(wěn)定性,并實現(xiàn)電流的單位功率因數(shù)入網(wǎng),選擇逆變器側(cè)電流閉環(huán)與交流側(cè)濾波電容電流前饋的電流雙環(huán)控制方案來完成理論分析和研究。針對電流雙環(huán)控制的并網(wǎng)逆變系統(tǒng),構(gòu)建控制系統(tǒng)的結(jié)構(gòu)框圖,并搭建其仿真模型,通過仿真分析來校驗電流雙環(huán)控制方案的正確性�？傊�,本文就是對光伏并網(wǎng)逆變系統(tǒng)進(jìn)行研究,并針對其穩(wěn)定性與電流的單位功率因數(shù)入網(wǎng)來分析其控制方案,其研究為光伏發(fā)電的并網(wǎng)運行提供理論基礎(chǔ)。
[Abstract]:In recent years, the problem of energy shortage and environmental pollution has become a concern that can not be ignored. From these two angles, this paper expounds the theoretical value and practical significance of photovoltaic power generation technology research. Through consulting a large number of literature, it is determined that the photovoltaic grid-connected inverter system still needs to be further studied, and then the goal is to improve the operation stability and power quality of the grid-connected inverter system. Firstly, the topology, classification and related technologies of photovoltaic grid-connected power generation system are comprehensively analyzed, and the three-phase voltage grid-connected inverter system is selected as the research object of this paper. The working mode of three-phase voltage source inverter is analyzed and its working principle is expounded. the high frequency modulation technology in switching inverter is analyzed, and PWM modulation is selected in the system. The advantages and disadvantages of the three filters are compared and analyzed, and the LCL filter is determined to be AC output filter. As an important link of grid-connected inverter system, AC output filtering is related to the power quality of grid access. In this paper, the working principle of LCL filter is analyzed in detail, which shows that LCL filter has good attenuation ability to harmonic components of grid-connected current. The transmission characteristics and resonance phenomenon of grid-connected current are analyzed, and the method of suppressing resonance peak is studied. Then the selection range of each parameter of LCL filter is obtained by step analysis and derivation. Aiming at the grid-connected inverter system of LCL filter, its mathematical model is established, and the current closed-loop control scheme of the system is analyzed and studied in detail. Aiming at the shortcomings of single closed loop current control, in order to improve the operation stability of the system and realize the unit power factor of current into the network, the current double loop control scheme of inverter side current closed loop and AC side filter capacitor current feedforward is selected to complete the theoretical analysis and research. Aiming at the grid-connected inverter system controlled by current double loop, the structure block diagram of the control system is constructed, and its simulation model is built. The correctness of the current double loop control scheme is verified by simulation analysis. In a word, this paper studies the photovoltaic grid-connected inverter system, and analyzes its control scheme according to the unit power factor of its stability and current, which provides a theoretical basis for the grid-connected operation of photovoltaic power generation.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM615;TM464

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