中压配电电压等级优选

上海电力学院

本科毕业设计（论文）

题 目： 中压配电电压等级优选研究 院 部： 专业年级： 学生姓名： 指导教师： 电气工程学院 电气工程及其自动化 2013届 倪盛 学号： 20091371 汤波

2013年6月16日

【摘 要】

我国城市、工业园区电网的电压等级的划分基本上以500、330、220kV为输电电压等级，以110、35kV为高压配电电压等级，以20、10kV为中压配电电压等级，以0.4kV为低压配电电压等级。10kV和20kV电压等级作为中压配电电压等级在国内外均有应用实践。但伴随着经济发展，电网规模扩大，配电网电压等级并非一成不变，而是不断进行着统一疏理与电压逐步升级统一的过程。随着我国经济的快速发展和电力电量需求的急剧提升，传统的10kV供电已经不能满足高负荷密度区域的供电要求，已明显暴露出在输电距离、输电功率、电能损失等方面的不足。

经过诸多学者研究表明目前的中压配电网电压等级可以考虑采用国外较为成熟的20kV，20kV电压等级已成为一些城市和开发区配电网的迫切需求，并且在有些地区已投入实际运行。但是，20kV供电相对10kV的优越性是什么、何种情况下更适合采用20kV，这些都需要经过详细的技术经济研究才能得出。

为此，本文从技术性、经济性和社会资源等角度对中压配电网是否采用20kV电压等级进行了充分的论证,从中得到一些在20kV电压等级方面有指导意义的结论，具有重要的现实意义。

关键词： 中压配电网；电压等级；20kV；可靠性；经济性

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【Abstract】

Voltage classes of urban power grid and industrial park power grid in our country are mainly divided into 500,330,220kV transmission voltage grade.110,35kV high voltage distribution voltage grade,20,10kV medium voltage distribution voltage level,0.4kV low voltage power distribution voltage grade.10kv and 20kv voltage level as the medium voltage distribution voltage grade have applied at home and abroad.But along with economic development,the power grid’s scale expands,the voltage distribution voltage grade is sorting out continually and upgrading unified step by step instead of standing still.With the rapid development of our country's economy and increase of electric power’s demand,traditional 10 kv power supply can’t meet the power supply requirements in high load density area,it has clearly showed the shortages in transmission distance, power transmission, power loss etc.

Many scholars’research shows that the medium voltage distribution network voltage grade can consider to use foreign relatively mature 20 kv,and 20 kv voltage grade have become urgent needs in some of the city and development zone distribution network,and in some areas has been put into actual operation.But which superiority is the 20 kv power supply relative to 10 kv, which circumstances is more suitable for using 20 kv,all these need to be reached according to detailed technical and economic studies.

So in this paper medium voltage distribution network is discussed in the aspects of technical, economic and social resources and whether it is adopt demonstrates the 20 kv voltage grade and Get some guidance significance in terms of the 20kV voltage level conclusions from it, and has the important practical significance.

Key Words: Medium voltage distribution network;Voltage level; 20kv; Reliability; economy

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目录

1 绪论 ........................................................... 1

1.1 选题背景 ................................................... 1 1.2 研究现状 ................................................... 2

1.2.1 国内中压配电网电压等级的变迁 .......................... 2 1.2.2 现行10kV的问题 ....................................... 3 1.2.3 20kV电压等级的出现 ................................... 4 1.3 研究内容 ................................................... 5 2 配电网概况 ..................................................... 7

2.1 引言 ....................................................... 7 2.2 中压电压等级的现状 ......................................... 7

2.2.1 10KV电压等级现状 ..................................... 7 2.2.2 20kV电压等级现状 ..................................... 8

3 评估指标体系 .................................................. 12

3.1 引言 ...................................................... 12 3.2 评估体系指标 .............................................. 12

3.2.1 技术性 ............................................... 12 3.3.2 经济性 ............................................... 14 3.3.3 可靠性 ............................................... 15 3.3.4 其他指标 ............................................. 16 3.3.5 小结 ................................................. 16

4 评估方法 ...................................................... 18

4.1 引言 ...................................................... 18 4.2 层次分析法评价 ............................................ 18 4.3 应用层次分析法进行决策的基本步骤 .......................... 18 4.4 具体评判过程 .............................................. 19 5 案例分析 ...................................................... 22

5.1 案例1 ..................................................... 22

5.1.1 案例介绍 ............................................. 22 5.1.2 负荷预测 ............................................. 23 5.1.3 配电网规划方案 ....................................... 23 5.1.4 综合评价 ............................................. 26 5.1.5 方案确定 ............................................. 35 5.2 案例2 ..................................................... 35

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