【摘要】：摘要：光伏發(fā)電具有成本低,無污染和可再生等諸多優(yōu)點,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)時電網(wǎng)電壓和頻率的波動,以及并網(wǎng)和孤島之間的模式切換,都會導致光伏發(fā)電系統(tǒng)電壓和頻率不穩(wěn)定及功率不平衡等問題。因此,采用適宜的并網(wǎng)控制方法,預(yù)防上述問題的出現(xiàn),實現(xiàn)光伏并網(wǎng)系統(tǒng)的并網(wǎng)和孤島模式之間的無縫切換顯得十分重要。 本文以光伏并網(wǎng)系統(tǒng)為研究對象,針對光伏并網(wǎng)系統(tǒng)在電網(wǎng)電壓和頻率波動及運行模式切換時易導致暫態(tài)不穩(wěn)定的現(xiàn)象,提出了采用虛擬同步發(fā)電機(VSG)的并網(wǎng)逆變器控制方法來解決該問題。論文首先建立了包括光伏電源、并網(wǎng)逆變器、儲能系統(tǒng)等各部分的數(shù)學模型,在此基礎(chǔ)上參照和研究了同步發(fā)電機的原理,構(gòu)建了用于控制并網(wǎng)逆變器的虛擬同步發(fā)電機算法。它使光伏并網(wǎng)系統(tǒng)能夠模擬同步發(fā)電機阻抗大、慣性大等優(yōu)點,滿足系統(tǒng)穩(wěn)定運行的要求。論文重點研究了光伏并網(wǎng)系統(tǒng)在運行模式切換時采用虛擬同步發(fā)電機控制算法對維持系統(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)電機原理,構(gòu)建了虛擬同步發(fā)電機算法。之后,研究了虛擬同步發(fā)電機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模型進行了仿真驗證和分析。仿真結(jié)果證明了虛擬同步發(fā)電機控制算法在光伏并網(wǎng)系統(tǒng)無縫切換時的可行性和準確性。圖42幅,表5個,參考文獻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.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM615

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