低压配电网环网系统设计、实现及可靠性分析-电气工程；电力系统及其自动化专业毕业论文.docx

华北电力大学硕士学位论文
摘 要
低压配电网作为电力系统最末端,其运行效果直接影响用户的用电体验。我国普遍采用干线式或放射式结构,发生故障后的停电范围较大,即使是具备环网结构的低压配电网,因其一般采用开环运行,较难解决用户短时停电的问题;此外,低压配电网络智能化程度较低,造成故障定位与恢复往往依靠运行人员的现场操作,故障后恢复供电的时间较长,对于高层电梯、消防等重要负荷的影响较大。随着社会经济的发展,传统低压配电网络越来越难以满足用户对高供电可靠性的要求,因此研究新型的低压供电方式具有现实意义。
本文研究低压配电网闭环运行,旨在提高低压配电网供电可靠性。从环网运
行的特点、所需的保护、通讯以及监控软件等关键技术出发,研究了低压配电网闭环运行与中压配电系统闭环运行的区别,并分柝了低压配电网闭环运行对中压侧的影响;以智能终端为基础,介绍了低压闭环运行系统组成结构,提出了适应低压配电网闭环运行的相关保护:编写了基于IEC一103通讯规约的主站侧通讯控制程序、利用Visio强大的图形处理能力以及图元信息管理能力,编写低压闭环运行的图形监测与远程控制程序,保证低压配电网闭环的安全运行。研究了闭环
后对用户供电可靠性的影响,并鉴于智能终端提供的设备基础与通讯网络提供的数据获取途径,及iQuery脚本框架编写了基于web的低压供电可靠性管理程序,探索对低压供电可靠性的管理。
关键词:低压配电网;闭环运行:IEC一103通讯约;Visio二次开发:可靠性分析
与管理
万方数据
华北电力大学硕士学位论文
Abstract
As the terminal of power system,low voltage work’S operation state directly i mpacts user a fault OCCURS,a significant influence will be imposed on users’terminal due to the widely used open radial structure of low—voltage(LⅣ)network;Even with ring structure,the LV work
usually operated as open work,making it difficult to solve the short time
outage ,fault locating and power recovering rely Oil on—site operation due to the low automatic degree of LV work,which takes long time to fix problems and has great effect on important loads,including high
building elevator,firefighting load et al,With the development of economy, traditional LV work cannot keep pace with the requirements for high
reliability of power supply to summary,a new way of work tO supply power has practical significance.
The closed-loop operation mode of LV work is discussed in this paper,aiming at the improvement of on characters of closed—loop structure,protection munication,monitor software and other essential
technology,the differences between closed—loop operation of LV work
and media voltage work is studied,as well as the effects of LV work closed—loop operation on on smart terminal unit(STU),ponents as well as suitable protection of closed—loop LV system are