【摘要】：當(dāng)今的社會在高度發(fā)展,社會變化是日新月異,因此低壓配電網(wǎng)中的負(fù)荷情況越來越復(fù)雜。小作坊的興起、大量電力電子設(shè)備器件的使用,會使配電網(wǎng)中出現(xiàn)大量的諧波電流、無功不足、零序電流和三相不平衡的情況。這些情況越來越嚴(yán)重,給配電網(wǎng)的可靠運行和電能質(zhì)量帶來了巨大的危害。在人們生活生平不斷提高的今天,對生活質(zhì)量的要求也在提高,因此對電能質(zhì)量的要求也在提高。針對上面的情況,本文基于靜止無功發(fā)生器(SVG)的無功補償技術(shù),在滿足低壓三相四線制配電網(wǎng)經(jīng)濟運行的條件下,對低壓配電系統(tǒng)的無功補償策略進行了研究。在補償結(jié)果的分析中,本文基于MATLAB/Simulink建立一個負(fù)載中含有諧波、零序電流和三相不平衡的負(fù)載仿真模型,仿真的結(jié)果分析證明本文所設(shè)計的SVG對低壓三相四線制配電網(wǎng)的綜合治理具有良好的效果,經(jīng)過SVG的補償后系統(tǒng)中諧波數(shù)量減少,零序電流基本趨近于零,三相不平衡問的也得到了明顯的改善,功率因數(shù)也得到了提高。本文的具體工作的如下:(1)在閱讀大量的文獻基礎(chǔ)上,熟悉SVG的基本工作原理,利用SVG治理低壓配電網(wǎng)并且建立了 SVG在低壓三相四線制配電系統(tǒng)中的數(shù)學(xué)模型。(2)考慮到低壓配電網(wǎng)的負(fù)荷情況,接下來對SVG的補償策略和電流檢測環(huán)節(jié)進行了研究,使SVG適應(yīng)于低壓配電網(wǎng)的環(huán)境,滿足條件,取代以往的補償設(shè)備。(3)依據(jù)大量的理論研究,本文基于MATLAB/Simulink建立一個SVG補償?shù)蛪喝嗨木�制配電網(wǎng)的補償系統(tǒng),通過對仿真結(jié)果的分析驗證了 SVG補償系統(tǒng)對低壓三相四線制的綜合治理取得了預(yù)期的效果。
[Abstract]:Today's society is highly developed, social changes are changing with each passing day, so the load situation in the low voltage distribution network is becoming more and more complex. The rise of small workshops and the use of a large number of power electronic devices will lead to a large number of harmonic currents, reactive power shortages, zero-sequence currents and three-phase imbalances in the distribution network. These situations are becoming more and more serious, which brings great harm to the reliable operation and power quality of distribution network. With the improvement of people's life and life, the requirement of quality of life is also improving, so the requirement of power quality is also improving. In view of the above situation, the reactive power compensation strategy of low voltage distribution system is studied in this paper based on the reactive power compensation technology of static Var Generator (SVG) under the condition of satisfying the economical operation of low voltage three-phase four-wire distribution network. In the analysis of compensation results, a load simulation model with harmonic, zero-sequence current and three-phase unbalance is established based on MATLAB/Simulink. The simulation results show that the SVG designed in this paper has a good effect on the comprehensive treatment of low voltage three-phase four-wire distribution network. After the compensation of SVG, the number of harmonics in the system is reduced, and the zero-sequence current approaches to zero. The three-phase imbalance problem has also been obviously improved, and the power factor has also been improved. The specific work of this paper is as follows: (1) on the basis of reading a lot of literature, I am familiar with the basic working principle of SVG. The mathematical model of SVG in low voltage three-phase four-wire distribution system is established by using SVG. (2) considering the load of low-voltage distribution network, the compensation strategy and current detection of SVG are studied. Make SVG adapt to the environment of low voltage distribution network, satisfy the condition, replace the former compensation equipment. (3) based on a lot of theoretical research, this paper establishes a compensation system of SVG compensation low voltage three-phase four-wire distribution network based on MATLAB/Simulink. The simulation results show that the SVG compensation system has achieved the desired effect on the integrated treatment of low voltage three-phase four-wire system.
【學(xué)位授予單位】：沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM761.12
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本文編號：2359537