本文選題：LCL濾波器 + 光伏并網(wǎng)逆變器��； 參考：《安徽理工大學(xué)》2014年碩士論文

【摘要】：近年來,隨著能源短缺與環(huán)境污染的加劇,發(fā)展清潔能源成了當(dāng)今能源研究的熱點(diǎn)。太陽能因?yàn)槠溆弥槐M、取之不竭和無污染的特點(diǎn)受到了廣泛關(guān)注。光伏發(fā)電也成了電力行業(yè)的一大熱門課題。光伏并網(wǎng)發(fā)電系統(tǒng)是未來太陽能發(fā)電的主要形式。在光伏并網(wǎng)發(fā)電系統(tǒng)中,逆變環(huán)節(jié)是系統(tǒng)的重要組成部分。本文主要針對(duì)這個(gè)部分展開研究,主要研究內(nèi)容如下： 首先,介紹了光伏發(fā)電系統(tǒng)的幾種基本結(jié)構(gòu),重點(diǎn)分析了光伏發(fā)電系統(tǒng)的核心部件—并網(wǎng)逆變器的結(jié)構(gòu)、分類等。從中選取三相全橋逆變電路作為光伏并網(wǎng)逆變器。為獲得高質(zhì)量的并網(wǎng)電流,在三相全橋逆變器后端加上LCL濾波器作為后級(jí)濾波環(huán)節(jié)。LCL濾波器的濾波性能良好,但存在諧振問題,故參數(shù)的設(shè)計(jì)對(duì)系統(tǒng)穩(wěn)定性的保持顯得尤為重要。本文從等效總電感量、功率控制和諧振頻率三個(gè)方面對(duì)濾波器的參數(shù)進(jìn)行設(shè)計(jì)。LCL濾波器因其自身的優(yōu)點(diǎn),在大功率場合的應(yīng)用越來越廣泛,但其存在固有諧振點(diǎn)。為了解決這一問題,本文根據(jù)LCL濾波器的拓?fù)浣Y(jié)構(gòu),分析其工作原理,從無源阻尼控制和有源阻尼控制兩方面分析LCL型光伏并網(wǎng)逆變器的控制方案。通過采用不同位置的電流作為系統(tǒng)控制的反饋量,分析不同反饋量對(duì)系統(tǒng)穩(wěn)定性的影響,本文提出一種新的并網(wǎng)逆變器控制策略——并網(wǎng)電流外環(huán)、電容電流內(nèi)環(huán)的雙閉環(huán)控制。建立其三相靜止坐標(biāo)系下的數(shù)學(xué)模型,求得其在兩相旋轉(zhuǎn)坐標(biāo)系下的模型,通過解耦,實(shí)現(xiàn)d、q軸電流獨(dú)立控制,實(shí)現(xiàn)電流雙閉環(huán)控制,并采用SVPWM方式進(jìn)行調(diào)制。 然后在MATLAB/Simulink環(huán)境中搭建系統(tǒng)仿真模型,對(duì)LCL濾波器參數(shù)和控制策略的選取進(jìn)行驗(yàn)證。仿真結(jié)果表明,基于并網(wǎng)電流外環(huán)、電容電流內(nèi)環(huán)的雙閉環(huán)控制能實(shí)現(xiàn)高功率因數(shù)跟蹤電網(wǎng),且系統(tǒng)能保持穩(wěn)定,并且LCL濾波器能有效濾除電流高次諧波,提高并網(wǎng)電流質(zhì)量,具有較大的理論和實(shí)踐意義。最后對(duì)系統(tǒng)的硬件部分進(jìn)行了設(shè)計(jì),包括主電路設(shè)計(jì)、采樣電路設(shè)計(jì)、保護(hù)電路設(shè)計(jì)及驅(qū)動(dòng)電路設(shè)計(jì)。
[Abstract]:In recent years, with the increasing of energy shortage and environmental pollution, the development of clean energy has become the focus of energy research. Solar energy has been widely concerned because of its inexhaustible, inexhaustible and pollution-free characteristics. Photovoltaic power generation has also become a hot topic in the power industry. Photovoltaic grid-connected power generation system is the main form of solar power generation in the future. In photovoltaic grid-connected generation system, inverter is an important part of the system. This paper focuses on this part of the study, the main research content is as follows: Firstly, several basic structures of photovoltaic power generation system are introduced, and the structure and classification of grid-connected inverter, the core component of photovoltaic power generation system, are emphatically analyzed. Three-phase full-bridge inverter is selected as photovoltaic grid-connected inverter. In order to obtain high quality grid-connected current, the filter with LCL filter at the back end of three-phase full-bridge inverter has good filtering performance, but the resonance problem exists. So the design of parameters is very important to the stability of the system. In this paper, the parameters of the filter are designed from three aspects: equivalent total inductance, power control and resonant frequency. Because of its own advantages, the LCL filter is more and more widely used in high-power applications, but it has inherent resonance point. In order to solve this problem, according to the topology of LCL filter, this paper analyzes its working principle, and analyzes the control scheme of LCL photovoltaic grid-connected inverter from two aspects: passive damping control and active damping control. By using the current of different position as the feedback quantity of the system control, and analyzing the influence of the different feedback quantity on the stability of the system, a new control strategy of grid-connected inverter, the grid-connected current outer loop, is proposed in this paper. Double closed loop control of capacitor current inner loop. The mathematical model in the three-phase stationary coordinate system is established, and its model in the two-phase rotating coordinate system is obtained. By decoupling, the current of dq-axis is controlled independently and the current is controlled by double closed loop, and the modulation is carried out by using SVPWM mode. Then the system simulation model is built in MATLAB/Simulink environment to verify the selection of LCL filter parameters and control strategies. The simulation results show that the double closed-loop control of capacitive current inner loop based on grid-connected current outer loop can realize high power factor tracking power grid, and the system can maintain stability, and LCL filter can effectively filter high harmonic current and improve the quality of grid-connected current. It has great theoretical and practical significance. Finally, the hardware part of the system is designed, including the main circuit design, sampling circuit design, protection circuit design and drive circuit design.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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本文編號(hào)：1777239