【摘要】：隨著經(jīng)濟(jì)發(fā)展和工業(yè)技術(shù)水平的飛速進(jìn)步,各種非線性和電力變化敏感性負(fù)荷在工業(yè)生產(chǎn)中大量應(yīng)用,導(dǎo)致電能質(zhì)量問題越來越嚴(yán)峻。在諸多的電能質(zhì)量問題中,電壓暫降有著發(fā)生頻次高和危害程度大等特點(diǎn),已經(jīng)成為當(dāng)今電力工作者最為關(guān)注的電能質(zhì)量問題之一。實(shí)時(shí)地檢測(cè)出電壓暫降的發(fā)生并且準(zhǔn)確地提取出電壓暫降的特征量,是對(duì)電壓暫降進(jìn)行高效治理的前提和關(guān)鍵問題之一,具有非常重要的實(shí)際應(yīng)用意義。本文首先闡述了電能質(zhì)量和電壓暫降的相關(guān)概念,分析了現(xiàn)階段國(guó)內(nèi)外科學(xué)工作者針對(duì)電壓暫降檢測(cè)問題的研究現(xiàn)狀,然后介紹了空間矢量的相關(guān)理論,并應(yīng)用空間矢量對(duì)電壓暫降進(jìn)行檢測(cè)。本文的主要工作如下:(1)研究了一種基于空間矢量的電壓暫降檢測(cè)方法�？紤]到應(yīng)用傳統(tǒng)空間矢量方法分析電壓暫降特征量時(shí)不能解決在電壓暫降時(shí)伴隨的電壓相位角跳變的問題,通過對(duì)三相電壓信號(hào)進(jìn)行Clarke變換構(gòu)造出三相電壓空間矢量,根據(jù)空間矢量在復(fù)平面上的軌跡形狀,判斷出電壓暫降類型并識(shí)別出故障相;通過空間矢量的橢圓參數(shù),通過求解方程組的形式計(jì)算出電壓相位角跳變值,進(jìn)而對(duì)原始三相電壓信號(hào)進(jìn)行移相操作,消除了電壓相位角跳變的影響,最終可以快速計(jì)算出電壓暫降深度。仿真結(jié)果表明該方法可以識(shí)別出電壓暫降的故障類型并且計(jì)算出電壓相位角跳變值和電壓暫降深度。(2)研究了一種改進(jìn)的基于空間矢量的電壓暫降檢測(cè)方法。應(yīng)用空間矢量檢測(cè)電壓暫降需要一個(gè)完整電壓周期的三相電壓數(shù)據(jù)。為了進(jìn)一步提高檢測(cè)方法運(yùn)行速度,結(jié)合一種快速橢圓擬合方法,僅使用一個(gè)電壓周期內(nèi)的任意三個(gè)時(shí)刻的三相電壓值,即可擬合出三相電壓空間矢量在復(fù)平面上的軌跡方程,進(jìn)而可以計(jì)算出電壓暫降的特征量。實(shí)驗(yàn)結(jié)果表明該方法能夠識(shí)別出電壓暫降故障類型和計(jì)算電壓暫降特征量,并且所需數(shù)據(jù)更少,計(jì)算量更小。
[Abstract]:With the development of economy and the rapid progress of industrial technology, a variety of nonlinear and power change sensitive loads are widely used in industrial production, which leads to more and more serious power quality problems. Among many power quality problems, voltage sag has the characteristics of high frequency and great harm, and has become one of the most concerned power quality problems for electric power workers. Detecting the occurrence of voltage sag in real time and accurately extracting the characteristic quantity of voltage sag is one of the prerequisites and key problems for efficient treatment of voltage sag, which has very important practical application significance. In this paper, the related concepts of power quality and voltage sag are described, the research status of voltage sag detection by scientists at home and abroad is analyzed, and then the related theory of space vector is introduced. The space vector is used to detect the voltage sag. The main work of this paper is as follows: (1) A voltage sag detection method based on space vector is studied. Considering that the traditional space vector method can not solve the problem of voltage phase angle jump when the voltage sag characteristic quantity is analyzed, the three-phase voltage space vector is constructed by Clarke transform of the three-phase voltage signal. According to the trajectory shape of space vector on the complex plane, the type of voltage sag is judged and the fault phase is identified. Through the elliptical parameters of the space vector, the voltage phase angle jump value is calculated by solving the equations, and then the phase shift operation of the original three-phase voltage signal is carried out to eliminate the influence of the voltage phase angle jump. Finally, the voltage sag depth can be calculated quickly. The simulation results show that this method can identify the fault type of voltage sag and calculate the voltage phase angle jump value and voltage sag depth. (2) an improved voltage sag detection method based on space vector is studied. The application of space vector to detect voltage sag requires a complete voltage cycle of three-phase voltage data. In order to further improve the running speed of the detection method, combined with a fast elliptical fitting method, the trajectory equation of the three-phase voltage space vector on the complex plane can be fitted by using only the three-phase voltage value at any three times in a voltage period. Furthermore, the characteristic quantity of voltage sag can be calculated. The experimental results show that the method can identify the fault type of voltage sag and calculate the characteristic quantity of voltage sag, and the required data is less and the amount of computation is smaller.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM714.2

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 范帥帥;低頻電流比較儀控制系統(tǒng)的研究[D];青島大學(xué);2018年

2 寧康;含分布式電源配電網(wǎng)的電能質(zhì)量分析[D];鄭州大學(xué);2018年

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本文編號(hào)：2485569