摘 要：电能是人们不可或缺的能源，保证电能的安全稳定运行是根本。在电力系统中，配电网是直接连接用户的,它存在着供电半径短，功率因素低，无功功率不足等问题。线路电能损失相当严重，电压损失也相当明显。对配电网进行无功优化能够提高电能质量，减少电压和电能的损耗。本文主要以配电网的电网损耗和负序电流为前提建立配电网自动电压无功运行控制的数学模型，并使用简化梯度法对其求解，得到配电网各补偿节点自动电压无功运行的控制指标。经算例验证，本文提出的配电网自动电压无功运行控制方案，能有效地提高配电网的电压水平，兼顾网损最小和负序电流最小。67571

毕业论文关键词：电能,配电网,无功优化,自动电压控制

Abstract：Power is people indispensable energy, to ensure the safe and stable operation of electric energy is fundamental In power system, power distribution network is connected directly to the user, it there is a power supply radius of long, low power factor, reactive power shortage and so on Line power loss is quite serious, voltage loss is quite obvious Reactive power optimization of distribution network can improve power quality, reduce the voltage and power consumption This article mainly distribution grid loss and negative sequence current as the prerequisite to establish mathematical model of distribution network automatic voltage reactive power operational control, and use the reduced gradient method for the solution, get the automatic voltage reactive power compensation node distribution network operation control indicators Verified by an example, this paper puts forward the automatic voltage reactive power distribution network operation control scheme, can effectively improve the voltage level of distribution network, both minimum network loss minimum and negative sequence current.

Keywords: electricity, The distribution network,reactive power optimization ,automatic Voltage Control

             

   

目录

前言 4

1.1 电力系统和供配电系统概述 4

1.2 配电网无功优化的研究背景及意义 4

1.3配电网的三相不平衡问题及解决方向 5

1.4配电网的组成定义及其主要特点 5

1.5无功优化的概念和分类 6

1.6无功优化方法的研究现状 6

1.7本文的主要工作 8

2 配电网无功优化的基本理论 8

2.1 配电网的无功负荷和无功损耗 8

2.2配电网的平衡特性与负荷补偿 9

2.3无功功率与电压波动的原因 10

2.4 无功功率对电压的影响 11

3 配电网无功优化的数学模型 12

3.1 配电网无功优化的变量 12

3.2 配电网无功优化的目标函数 13

3.3 配电网无功优化的约束条件 13

3.4 配电网无功优化的梯度法求解 15

4 配电网无功优化的算例 16

5 本文总结 17

参考文献 考虑三相不平衡的配网无功优化:http://www.youerw.com/zidonghua/lunwen_75809.html