摘 要对于电力系统的建设规划，潮流计算具有重要意义。根据已有的电网拓扑、支路数据和支路上相关设备的运行情况， 潮流计算可以得出电力系统稳态时各部分状态数据，其中包括母线电压、线路流过功率及网络中的相关损耗等。由于潮流计算是研究电力系统稳态运行和暂态分析的基础，且在实际应用中，潮流分析的结果对电力系统发供电有着极大影响。因而，探索高效的潮流计算方法一直是电力科研工作者的奋斗目标。当前，由于电力网络规模的急剧增大及线路结构趋于复杂，在实际应用中，手算潮流早已成为过去。然而，迅猛发展的计算机技术为人们提供了一个有力的计算工具，使大规模电力网络的潮流计算得以实现。本文设计的目标是面向一般的电力网络，建立电力网络的数学模型，以牛顿—拉夫逊法作为解潮流方程的算法，基于 MATLAB 软件编写通用计算程序，并以一个30 节点的实例网络进行测试分析，证明程序的实用价值。同时，考虑到人机互动性，本次设计将Excel 表格、TXT 文档与 MATLAB 程序紧密联系起来，使输入输出界面更加人性化。37758
毕业论文关键词： 潮流分析 牛顿—拉夫逊法 MATLAB 人机互动性
Abstract With the development and planing of power system, power flowcalculation is significant. According to existing network topology, branchdata and the operating condition of branch’s relevant equipment, eachpart of conditional status can be worked out by power flow calculationwhen the power system is under the stable condition, which includes busvoltage, circuit efficiency, network loss and so on. The power flowcalculation is the basis of studying steady state and transient state ofpower system. Meanwhile, the result of power flow analysis is of greatinfluence to power generation and power supply in the practicalapplication. As a result, exploring the efficient power flow calculationway has always been the ultimate goal of electricity scientists. At present,due to the increased large power network scale and complicated circuitstructure,it is old-fashioned that use manual computation in practicalapplication. However, the rapid development of computer technologyprovides a powerful calculating tool for human being, which makes thelarge scale power flow calculation come true.This paper aims to build a mathematic model of the electric powernetwork. It is based on Newton-Raphson method for the solution of theflow equation algorithm and MATLAB software. In order to prove thepractical value of the program, a 30 nodes network is chosen to be theinstance. At the same time, considering the human-machine interaction, this paper will closely connect Excel spreadsheets, TXT documents withMATLAB program, which will humanize the input as well outputinterface.
Key words: Power flow Newton-Raphson method MATLABHuman-machine interaction
目录
摘要.I
Abstract.II
1绪论.1
1.1潮流分析的目的和意义1
1.2潮流计算发展史1
1.3MATLAB在潮流计算的应用.2
1.4本文主要工作2
2电力网络的数学模型3
2.1电力网络的基本方程式3
2.2节点导纳矩阵的形成及算法4
2.2.1自导纳和互导纳.4
2.2.2非标准变比变压器的计算.5
2.2.3系统变更时的修正.6
3潮流计算的计算机算法8
3.1潮流计算的基本方程8
3.2节点的分类8
3.3潮流计算时的约束条件9
3.4牛顿—拉夫逊法潮流计算10
3.4.1牛顿—拉夫逊法的概述.10
3.4.2牛顿法在潮流计算的应用.13
3.4.3潮流计算的处理技巧.17
3.5快速解耦潮流算法20
4潮流计算程序设计24
4.1程序设计流程24
4.2程序数据输入25
4.3程序核心代码26
4.3.1数据读取程序段.26
4.3.2节点导纳矩阵形成程序段.26 MATLAB电力系统潮流分析与设计:http://www.751com.cn/zidonghua/lunwen_36603.html