本文選題：孤島檢測(cè)　切入點(diǎn)：多逆變器　出處：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著能源的短缺,光伏、風(fēng)能等清潔能源日益受到青睞,近些年,光伏并網(wǎng)發(fā)電技術(shù)迅速發(fā)展。孤島保護(hù)作為光伏并網(wǎng)系統(tǒng)的一項(xiàng)必備保護(hù),其檢測(cè)方法及方法改進(jìn)的研究一直受到廣泛關(guān)注。當(dāng)光伏并網(wǎng)系統(tǒng)的大電網(wǎng)斷開(kāi),光伏單獨(dú)為負(fù)載供電,此現(xiàn)象稱為孤島現(xiàn)象,孤島發(fā)生會(huì)對(duì)檢修人員和用電設(shè)備均造成傷害,所以必須及時(shí)檢測(cè)出孤島現(xiàn)象,并采取相應(yīng)的保護(hù)措施,孤島檢測(cè)方法的研究具有實(shí)際意義�，F(xiàn)有的孤島檢測(cè)主要是針對(duì)單逆變器并網(wǎng)條件下孤島檢測(cè)方法或者改進(jìn)的方法的研究,然而隨著光伏容量的增加,逆變器臺(tái)數(shù)的增多,多逆變器孤島檢測(cè)也隨之面臨更多的問(wèn)題。本文首先對(duì)單逆變器并網(wǎng)孤島檢測(cè)方法進(jìn)行了詳細(xì)的分析,隨后對(duì)多逆變器并網(wǎng)孤島檢測(cè)問(wèn)題開(kāi)展研究,主要內(nèi)容如下:(1)研究建立多逆變器采用主動(dòng)頻移法相互影響和作用機(jī)理模型,對(duì)多逆變器并網(wǎng)盲區(qū)變化機(jī)理進(jìn)行分析(2)針對(duì)多逆變器并網(wǎng)孤島檢測(cè)特性,結(jié)合仿真和實(shí)測(cè)數(shù)據(jù)進(jìn)行分析,研究基于小波分析的多逆變器并網(wǎng)孤島特征向量的提取方法;(3)研究基于小波變換與支持向量機(jī)的多逆變器并網(wǎng)孤島檢測(cè)法,應(yīng)用支持向量機(jī)建立所提取的特征量的分類模型及求解方法,對(duì)多逆變器并網(wǎng)孤島進(jìn)行判斷。仿真結(jié)果表明,基于支持向量機(jī)的多逆變器并網(wǎng)孤島檢測(cè)算準(zhǔn)確率高,穩(wěn)定性好,能夠有效區(qū)分孤島和非孤島兩種不同運(yùn)行狀態(tài)。
[Abstract]:With the shortage of energy, photovoltaic, wind energy and other clean energy are increasingly favored. In recent years, photovoltaic grid-connected power generation technology has developed rapidly. The research on the detection method and method improvement has been paid more and more attention. When the large grid of photovoltaic grid-connected system is disconnected, the photovoltaic power supply for the load alone, this phenomenon is called "isolated island phenomenon", and the occurrence of isolated island will cause harm to maintenance personnel and electric equipment. So we must detect the phenomenon of isolated islands in time and take corresponding protective measures. The research of islanding detection method is of practical significance. The existing islanding detection is mainly aimed at the islanding detection method or the improved method under the condition of single inverter grid-connected. However, with the increase of photovoltaic capacity, the number of inverters increases. The islanding detection of multi-inverter also faces more problems. Firstly, the detection method of single-inverter grid-connected islanding is analyzed in detail, and then the detection problem of multi-inverter grid-connected islanding detection is studied. The main contents are as follows: 1) the model of interaction and action mechanism of multi-inverter using active frequency shift method is established, and the mechanism of blind zone change of multi-inverter grid-connected is analyzed. Based on the analysis of simulated and measured data, this paper studies the method of extracting the eigenvector of multi-inverter grid-connected islanding based on wavelet analysis) and studies the detection method of grid-connected islanding of multi-inverter based on wavelet transform and support vector machine. The classification model and solution method of the extracted feature are established by using support vector machine. The simulation results show that the detection accuracy and stability of multi-inverter grid-connected island detection based on support vector machine are high. It can effectively distinguish two different operation states: isolated island and non-isolated island.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM464;TM615

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