本文選題：低壓配電網(wǎng) + 三相不平衡　； 參考：《大連理工大學》2014年碩士論文

【摘要】：現(xiàn)代電力電子技術及相關產(chǎn)業(yè)的迅猛發(fā)展,促使電網(wǎng)和負荷的構成出現(xiàn)了新的變化趨勢。大量非線性沖擊性負荷和單相負荷如電弧爐、大型軋鋼機、電力機車以及大型半導體變流裝置等的接入和運行,進一步加劇了電網(wǎng)電壓波動、閃變、三相不平衡等現(xiàn)象,并嚴重威脅電網(wǎng)的安全穩(wěn)定運行。所以,如何優(yōu)化配電網(wǎng)絡一直都是國內(nèi)外研究的重點,而配電網(wǎng)絡三相不平衡調(diào)補和無功補償更是其中的重要課題。 目前,國內(nèi)外針對供電點三相不平衡調(diào)節(jié)的研究,大都局限于三相三線制的中壓配電網(wǎng),而對于三相四線制低壓配電網(wǎng)中的三相不平衡現(xiàn)象研究較少。有的學者提出了一些解決方案,如使用三角形連接的SVC和星形連接的SVC的組合方式進行調(diào)補,但是這種調(diào)補裝置體積大、成本高,還會產(chǎn)生大量諧波。 本文針對上述問題,并結合我國低壓配電網(wǎng)系統(tǒng)三相四線制的特點,研究出在低壓三相四線制系統(tǒng)中應用全電容補償方法對三相不平衡負荷進行負荷有功平衡和無功補償?shù)木C合補償技術,并且提出了一種基于電網(wǎng)電壓矢量定向變換的負荷電流基波有功無功分量檢測方法。并通過MATLAB/SIMULINK的仿真結果說明了這種調(diào)補方法正確性和可行性。最后,在上述研究基礎上,應用嵌入式ARM7單片機LPC2138和智能編組復合開關,研制了一套低壓三相不平衡調(diào)補裝置實驗樣機,并編寫了一套上位機監(jiān)控系統(tǒng),搭建起實驗系統(tǒng),進行了相關實驗研究。實驗結果表明這種調(diào)補裝置具有出色的調(diào)整三相負荷不對稱及補償無功功率的能力,而且性能優(yōu)越。
[Abstract]:The rapid development of modern power electronics technology and related industries has led to a new trend of change in the structure of power grid and load. A large number of nonlinear impact loads and single-phase loads, such as EAF, large rolling mill, electric locomotive and large semiconductor variable flow device, have further aggravated the voltage fluctuation and flicker of the power grid. Three phase imbalance and other phenomena seriously threaten the safe and stable operation of the power grid. Therefore, how to optimize the distribution network has always been the focus of research at home and abroad, and the unbalanced three-phase adjustment and reactive compensation of the distribution network is one of the most important topics.
At present, the research on three-phase unbalanced regulation of power supply point at home and abroad is mostly limited to the medium voltage distribution network of three-phase three wire system, but few studies on three-phase unbalanced phenomenon in the three-phase four wire low voltage distribution network. Some scholars have put forward some solutions, such as the combination of SVC with triangular connection and the combination of star connected SVC. It is adjusted and compensated, but this kind of regulating and compensating device is large in volume and high in cost, and produces a large amount of harmonics.
In view of the above problems, combined with the characteristics of the three-phase four wire system of low voltage distribution network system in our country, a comprehensive compensation technology of full capacitor compensation method for three-phase unbalance load is studied in the low voltage three-phase four wire system, and a voltage vector oriented transformation based on power grid is proposed. Through the simulation results of MATLAB/SIMULINK, the correctness and feasibility of this method are illustrated. Finally, on the basis of the above research, an experimental prototype of low voltage three-phase unbalance adjusting device is developed by using the embedded ARM7 microcontroller LPC2138 and the intelligent marshalling switch. A host computer monitoring system is written, the experimental system is built, and the experimental results are carried out. The experimental results show that the compensator has excellent ability to adjust the unbalanced three-phase load and compensate the reactive power, and the performance is superior.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761

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