【摘要】：摘要：光伏發(fā)電具有成本低,無(wú)污染和可再生等諸多優(yōu)點(diǎn),已成為可再生能源發(fā)電的重要形式。但光照等自然條件的變化,并網(wǎng)時(shí)電網(wǎng)電壓和頻率的波動(dòng),以及并網(wǎng)和孤島之間的模式切換,都會(huì)導(dǎo)致光伏發(fā)電系統(tǒng)電壓和頻率不穩(wěn)定及功率不平衡等問(wèn)題。因此,采用適宜的并網(wǎng)控制方法,預(yù)防上述問(wèn)題的出現(xiàn),實(shí)現(xiàn)光伏并網(wǎng)系統(tǒng)的并網(wǎng)和孤島模式之間的無(wú)縫切換顯得十分重要。 本文以光伏并網(wǎng)系統(tǒng)為研究對(duì)象,針對(duì)光伏并網(wǎng)系統(tǒng)在電網(wǎng)電壓和頻率波動(dòng)及運(yùn)行模式切換時(shí)易導(dǎo)致暫態(tài)不穩(wěn)定的現(xiàn)象,提出了采用虛擬同步發(fā)電機(jī)(VSG)的并網(wǎng)逆變器控制方法來(lái)解決該問(wèn)題。論文首先建立了包括光伏電源、并網(wǎng)逆變器、儲(chǔ)能系統(tǒng)等各部分的數(shù)學(xué)模型,在此基礎(chǔ)上參照和研究了同步發(fā)電機(jī)的原理,構(gòu)建了用于控制并網(wǎng)逆變器的虛擬同步發(fā)電機(jī)算法。它使光伏并網(wǎng)系統(tǒng)能夠模擬同步發(fā)電機(jī)阻抗大、慣性大等優(yōu)點(diǎn),滿足系統(tǒng)穩(wěn)定運(yùn)行的要求。論文重點(diǎn)研究了光伏并網(wǎng)系統(tǒng)在運(yùn)行模式切換時(shí)采用虛擬同步發(fā)電機(jī)控制算法對(duì)維持系統(tǒng)暫態(tài)穩(wěn)定的可行性和有效性。 論文首先介紹了課題的研究背景,闡述了課題研究的必要性。其次分析和建立了光伏并網(wǎng)系統(tǒng)各部分的數(shù)學(xué)模型,并分析了系統(tǒng)模式切換的原因。在此基礎(chǔ)上參考同步發(fā)電機(jī)原理,構(gòu)建了虛擬同步發(fā)電機(jī)算法。之后,研究了虛擬同步發(fā)電機(jī)控制算法在光伏并網(wǎng)系統(tǒng)模式切換等暫態(tài)情況下的控制效果并搭建了系統(tǒng)的Matlab/Simulink模型進(jìn)行了仿真驗(yàn)證和分析。仿真結(jié)果證明了虛擬同步發(fā)電機(jī)控制算法在光伏并網(wǎng)系統(tǒng)無(wú)縫切換時(shí)的可行性和準(zhǔn)確性。圖42幅,表5個(gè),參考文獻(xiàn)66篇。
[Abstract]:Abstract: photovoltaic power generation has become an important form of renewable energy generation because of its advantages of low cost, no pollution and renewable. However, the variation of natural conditions such as illumination, the fluctuation of voltage and frequency during grid connection, and the mode switching between grid-connected and isolated islands will lead to voltage and frequency instability and power imbalance in photovoltaic power generation system. Therefore, it is very important to adopt suitable grid-connected control method to prevent the above problems and to realize seamless switching between grid-connected photovoltaic system and islanding mode. In this paper, the photovoltaic grid-connected system is taken as the research object, aiming at the transient instability of the grid-connected photovoltaic system when the voltage and frequency fluctuation of the grid and the switching of the operation mode are easy to lead to the transient instability. A grid-connected inverter control method based on virtual synchronous generator (VSG) is proposed to solve this problem. Firstly, the mathematical models of photovoltaic power supply, grid-connected inverter and energy storage system are established. Based on this, the principle of synchronous generator is studied and a virtual synchronous generator algorithm for grid-connected inverter is constructed. It enables photovoltaic grid-connected system to simulate the advantages of large impedance and inertia of synchronous generator, and meets the requirements of stable operation of the system. This paper focuses on the feasibility and effectiveness of using virtual synchronous generator control algorithm to maintain the transient stability of photovoltaic grid-connected systems. Firstly, the paper introduces the research background of the subject and expounds the necessity of the research. Secondly, the mathematical model of each part of photovoltaic grid-connected system is analyzed and the reason of system mode switching is analyzed. On the basis of this, a virtual synchronous generator algorithm is constructed by referring to the principle of synchronous generator. After that, the control effect of the control algorithm of virtual synchronous generator under the transient condition such as switching mode of photovoltaic grid-connected system is studied, and the Matlab/Simulink model of the system is built for simulation and analysis. The simulation results show the feasibility and accuracy of the virtual synchronous generator control algorithm when the photovoltaic grid-connected system switches seamlessly. There are 42 pictures, 5 tables and 66 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM615

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 郭小強(qiáng);趙清林;鄔偉揚(yáng);;光伏并網(wǎng)發(fā)電系統(tǒng)孤島檢測(cè)技術(shù)[J];電工技術(shù)學(xué)報(bào);2007年04期

2 唐西勝;鄧衛(wèi);齊智平;;基于儲(chǔ)能的微網(wǎng)并網(wǎng)/離網(wǎng)無(wú)縫切換技術(shù)[J];電工技術(shù)學(xué)報(bào);2011年S1期

3 余娟;孫鳴;鄧博;;DG的孤島運(yùn)行方式及其對(duì)保護(hù)與控制的影響[J];電力建設(shè);2009年06期

4 陳衛(wèi)民;陳國(guó)呈;崔開(kāi)涌;曹大鵬;張翼;吳春華;;分布式并網(wǎng)發(fā)電系統(tǒng)在孤島時(shí)的運(yùn)行控制[J];電力系統(tǒng)自動(dòng)化;2008年09期

5 丁明;楊向真;蘇建徽;;基于虛擬同步發(fā)電機(jī)思想的微電網(wǎng)逆變電源控制策略[J];電力系統(tǒng)自動(dòng)化;2009年08期

6 趙爭(zhēng)鳴;雷一;賀凡波;魯宗相;田琦;;大容量并網(wǎng)光伏電站技術(shù)綜述[J];電力系統(tǒng)自動(dòng)化;2011年12期

7 鄭競(jìng)宏;王燕廷;李興旺;王忠軍;王小宇;朱守真;;微電網(wǎng)平滑切換控制方法及策略[J];電力系統(tǒng)自動(dòng)化;2011年18期

8 杜威;姜齊榮;陳蛟瑞;;微電網(wǎng)電源的虛擬慣性頻率控制策略[J];電力系統(tǒng)自動(dòng)化;2011年23期

9 吳蓓蓓;蘇建徽;張軍軍;朱丹;;用于微電網(wǎng)孤島運(yùn)行的逆變電源控制方法[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2011年01期

10 戰(zhàn)杰;馬夢(mèng)朝;張彥;趙義術(shù);;大規(guī)模光伏電站孤島運(yùn)行方式分*析[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2011年02期

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本文編號(hào)：2262396