本文選題：單相光伏并網(wǎng)發(fā)電系統(tǒng) + 孤島檢測��； 參考：《華東理工大學》2014年碩士論文

【摘要】：目前,全世界都面臨能源枯竭和自然環(huán)境污染嚴重等問題。光伏發(fā)電在資源稀有的環(huán)境下已然成為全球各國重點發(fā)展的戰(zhàn)略產(chǎn)業(yè),光伏并網(wǎng)發(fā)電系統(tǒng)中的孤島檢測部分也是整個光伏發(fā)電系統(tǒng)中的關(guān)鍵部分,關(guān)系到光伏發(fā)電系統(tǒng)的可靠性和供電質(zhì)量,因此對其研究具有重要的意義。 本文首先介紹光伏并網(wǎng)發(fā)電系統(tǒng)的整體結(jié)構(gòu),其中包含光伏并網(wǎng)逆變的拓撲結(jié)構(gòu)、光伏逆變器的類型、及濾波環(huán)節(jié)的選擇等,之后給出了本文所采用的單相光伏并網(wǎng)發(fā)電系統(tǒng)的系統(tǒng)框圖和等效模型。其次,分別介紹了孤島檢測的基本原理、孤島檢測的國內(nèi)外標準以及目前孤島檢測的常用方法。接著提出一種新穎的偶次諧波注入主動式孤島檢測方法,詳細介紹了其檢測原理、偶次諧波注入取值范圍分析和濾波方法、并在Matlab/Simulink中搭建了單相光伏并網(wǎng)發(fā)電系統(tǒng)的孤島檢測仿真模型,針對不同負載條件下的孤島現(xiàn)象驗證此孤島檢測方法的有效性。經(jīng)過仿真表明,此方法檢測速度快,幾乎沒有檢測盲區(qū),魯棒性強,對大電網(wǎng)電能質(zhì)量影響小,同時能對多臺逆變器的并聯(lián)運行進行孤島檢測等優(yōu)點。此外,還提出了一種改進的主動頻移孤島檢測方法,并對其做具體的介紹和分析。這種注入的擾動能使光伏并網(wǎng)逆變輸出電流波形有較低的總諧波失真、相比傳統(tǒng)的主動移頻式(AFD)孤島檢測方法有更小的非檢測區(qū),同時通過實際仿真驗證了改進方法光伏并網(wǎng)逆變輸出電流波形效果的有效性。最后針對全文所做的工作做了概括總結(jié),并提出了今后新的研究方向。
[Abstract]:At present, the world is faced with energy depletion and serious pollution of the natural environment and other problems. Photovoltaic power generation in the environment of scarce resources has become the key development of strategic industries in the world, photovoltaic grid-connected power generation system detection part is also the key part of the whole photovoltaic power system. The research of photovoltaic system is of great significance because of its reliability and power supply quality. This paper first introduces the whole structure of grid-connected photovoltaic power generation system, including the topology of grid-connected photovoltaic inverter, the type of photovoltaic inverter, and the selection of filtering links, etc. Then the system block diagram and equivalent model of single-phase photovoltaic grid-connected generation system are given. Secondly, the basic principle of islanding detection, the domestic and foreign standards of islanding detection and the common methods of islanding detection are introduced respectively. Then a novel active islanding detection method for even harmonic injection is proposed. The detection principle, range analysis and filtering method of even harmonic injection are introduced in detail. The islanding detection simulation model of single-phase photovoltaic grid-connected generation system is built in Matlab/Simulink, and the effectiveness of this detection method is verified by the islanding phenomenon under different load conditions. Simulation results show that this method has the advantages of high detection speed, almost no blind area detection, strong robustness, little influence on the power quality of large power grid, and the ability to detect the parallel operation of multiple inverters in isolated islands. In addition, an improved active frequency shift islanding detection method is presented and analyzed in detail. The injected disturbance can reduce the total harmonic distortion of the output current waveform of the grid-connected photovoltaic inverter, and it has a smaller non-detection area than the traditional active frequency shift AFD-island detection method. At the same time, the effectiveness of the improved method is verified by simulation. Finally, the work done in this paper is summarized, and a new research direction in the future is put forward.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM615

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本文編號：1879911