發(fā)布時(shí)間：2018-05-04 15:45

  本文選題：微電網(wǎng) + 并網(wǎng)逆變器��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：近年來分布式發(fā)電得到了大力的發(fā)展,但其本身也存在著一些不足,為了彌補(bǔ)和克服分布式發(fā)電系統(tǒng)并網(wǎng)運(yùn)行時(shí)引起的電能質(zhì)量變差及可靠性降低等問題,同時(shí)發(fā)揮出分布式電源的價(jià)值和其效益優(yōu)勢(shì),微電網(wǎng)技術(shù)作為一個(gè)非常前沿的研究領(lǐng)域,在未來的幾年將會(huì)得到大力的研究和發(fā)展。目前微電網(wǎng)的發(fā)展還處于初級(jí)階段,針對(duì)現(xiàn)階段微電網(wǎng)研究存在的問題:分布式發(fā)電并網(wǎng)的電能質(zhì)量,微電網(wǎng)中多逆變器并聯(lián)的建模以及各個(gè)并網(wǎng)逆變器之間相互作用的機(jī)理。本文對(duì)微網(wǎng)中并網(wǎng)逆變器諧振問題以及多個(gè)逆變器并聯(lián)系統(tǒng)的建模和諧振問題進(jìn)行了深入的研究。(1)分析了并網(wǎng)逆變器的拓?fù)浣Y(jié)構(gòu)和基于同步旋轉(zhuǎn)坐標(biāo)系的數(shù)學(xué)模型,簡(jiǎn)要的分析了LCL濾波器的原理和數(shù)學(xué)模型,在此基礎(chǔ)上給出了并網(wǎng)逆變器的電流內(nèi)環(huán)控制結(jié)構(gòu),為之后的分析提供理論基礎(chǔ)。(2)分別在連續(xù)域和離散域?qū)蝹�(gè)并網(wǎng)逆變器的諧振抑制策略進(jìn)行了深入研究。對(duì)于無源阻尼策略,分析了阻尼電阻位置不同時(shí)對(duì)系統(tǒng)高頻特性和低頻特性的影響,深入分析了阻尼電阻的大小對(duì)系統(tǒng)穩(wěn)定性和濾波特性的影響;對(duì)于有源阻尼策略,基于最根本的電容電壓和電容電流反饋的有源阻尼法,在連續(xù)域和離散域分析了采用不同方法時(shí)的系統(tǒng)穩(wěn)定性;在此基礎(chǔ)上,進(jìn)一步分析了電網(wǎng)阻抗對(duì)有源阻尼和無源阻尼的影響。(3)對(duì)于微電網(wǎng)中多逆變器并聯(lián)系統(tǒng),建立了三相并網(wǎng)逆變器的Norton等效模型,在此基礎(chǔ)上,把單逆變器的Norton等效模型推廣到了多逆變器并聯(lián)系統(tǒng),建立了多逆變器的Norton等效模型;對(duì)于多逆變器并聯(lián)系統(tǒng),在離散域分析了逆變器內(nèi)部諧振、各逆變器之間的并聯(lián)諧振以及電網(wǎng)和逆變器之間的串聯(lián)諧振,并且分析了加入有源阻尼策略之后的諧振抑制效果。(4)在Matlab/simulink中搭建了單個(gè)并網(wǎng)逆變器和多逆變器并聯(lián)系統(tǒng)的仿真模型,對(duì)本文之前的理論分析進(jìn)行了仿真驗(yàn)證,仿真結(jié)果驗(yàn)證了理論分析的正確性。
[Abstract]:In recent years, distributed generation has been greatly developed, but it also has some shortcomings. In order to make up for and overcome the problems such as the deterioration of power quality and the decrease of reliability caused by the grid connection of distributed generation system, and so on. At the same time, the value and benefit advantage of distributed power generation are brought into play. As a very advanced research field, microgrid technology will be greatly researched and developed in the next few years. At present, the development of microgrid is still in the primary stage. Aiming at the problems existing in the research of microgrid at the present stage, such as the power quality of distributed generation and grid connection, the modeling of multi-inverters in microgrid and the mechanism of interaction between grid-connected inverters. In this paper, the resonant problem of grid-connected inverter in microgrid and the modeling and resonance of parallel inverter system are deeply studied. The topology of grid-connected inverter and the mathematical model based on synchronous rotating coordinate system are analyzed. The principle and mathematical model of LCL filter are analyzed briefly. On this basis, the current inner loop control structure of grid-connected inverter is given. To provide a theoretical basis for the subsequent analysis. (2) the resonant suppression strategies of a single grid-connected inverter in the continuous domain and discrete domain are studied in depth. For the passive damping strategy, the influence of the position of damping resistance on the high frequency and low frequency characteristics of the system is analyzed, and the influence of the damping resistance on the stability and filtering characteristics of the system is analyzed. Based on the most fundamental capacitive voltage and capacitive current feedback active damping method, the stability of the system using different methods is analyzed in the continuous and discrete domains. The influence of impedance on active damping and passive damping is further analyzed. The Norton equivalent model of three-phase grid-connected inverter is established for multi-inverter parallel system in microgrid. The Norton equivalent model of single inverter is extended to multi-inverter parallel system, and the Norton equivalent model of multi-inverter is established, and the internal resonance of inverter is analyzed in discrete domain for multi-inverter parallel system. The parallel resonance between the inverters and the series resonance between the power grid and the inverter, And the resonance suppression effect after the active damping strategy is analyzed. The simulation models of single grid-connected inverter and multi-inverter parallel system are built in Matlab/simulink, and the theoretical analysis before this paper is verified by simulation. The simulation results verify the correctness of the theoretical analysis.
【學(xué)位授予單位】：電子科技大學(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)：1843589