低压三相不平衡调补装置的研究和设计

发布时间：2018-05-27 18:44

本文选题：低压配电网 + 三相不平衡　；参考：《大连理工大学》2014年硕士论文

【摘要】：现代电力电子技术及相关产业的迅猛发展,促使电网和负荷的构成出现了新的变化趋势。大量非线性冲击性负荷和单相负荷如电弧炉、大型轧钢机、电力机车以及大型半导体变流装置等的接入和运行,进一步加剧了电网电压波动、闪变、三相不平衡等现象,并严重威胁电网的安全稳定运行。所以,如何优化配电网络一直都是国内外研究的重点,而配电网络三相不平衡调补和无功补偿更是其中的重要课题。目前,国内外针对供电点三相不平衡调节的研究,大都局限于三相三线制的中压配电网,而对于三相四线制低压配电网中的三相不平衡现象研究较少。有的学者提出了一些解决方案,如使用三角形连接的SVC和星形连接的SVC的组合方式进行调补,但是这种调补装置体积大、成本高,还会产生大量谐波。本文针对上述问题,并结合我国低压配电网系统三相四线制的特点,研究出在低压三相四线制系统中应用全电容补偿方法对三相不平衡负荷进行负荷有功平衡和无功补偿的综合补偿技术,并且提出了一种基于电网电压矢量定向变换的负荷电流基波有功无功分量检测方法。并通过MATLAB/SIMULINK的仿真结果说明了这种调补方法正确性和可行性。最后,在上述研究基础上,应用嵌入式ARM7单片机LPC2138和智能编组复合开关,研制了一套低压三相不平衡调补装置实验样机,并编写了一套上位机监控系统,搭建起实验系统,进行了相关实验研究。实验结果表明这种调补装置具有出色的调整三相负荷不对称及补偿无功功率的能力,而且性能优越。
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761

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