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湖南工业大学本科毕业设计（论文）I摘要本文分别对4节点电力网络，5节点电力网络和30节点的电力网络进行简单的电力网络的潮流计算，采用C++软件平台编制潮流程序，分别采用牛拉法和PQ快速解耦法编制了两个程序，通过对比两种算法的计算结果、迭代精度和迭代次数，进而分析得出两种潮流计算机方法的特点。电力系统的潮流计算是用来监测和研究有关于电力系统稳态运行状况的基本计算，是电力系统规划设计、运行与分析的基本工具。为提高电力网络系统自动化操作的快速性及准确性，而且让系统可以进行安全、系统地进行实时分析，电力网络的潮流变化信息是一项重要的资源，所以对于电力网络进行潮流计算是现在潮流计算的发展的一个方面。本文的主要内容就是基于简单电力网络地潮流计算设计，结合牛顿-拉夫逊法潮流计算，采用PQ快速解耦发潮流计算程序，完成基于C语言的电力系统潮流计算程序的设计。在电力系统在正常运行的情况下，通过对电力系统的潮流（功率、电压、相角等）来对电力系统网络的某一个特定时间点的运行状态进行描述。本文基于以上的基础知识对于电力系统网络潮流计算进行了设计、仿真，并且分析了在不同场景两种计算方法的结果精确度。关键词：C++编程；潮流计算；牛顿-拉夫逊算法；PQ快速解耦法；迭代比较湖南工业大学本科生毕业设计（论文）IIABSTRACTElectricpowernetwork,thisarticlerespectivelytofournode5nodepowernetworkwith30nodesofpowernetworktocarryonthesimpleelectricnetworkpowerflowcalculation,usingc++softwareplatformtrendprogram,withrafaandPQfastdecouplingmethodcreatedtwoprograms,bycomparingthecalculationresultsoftwoalgorithms,iterativeprecisionandthenumberofiterations,thenanalysisthecharacteristicsofthetwomethodsoftrendofthecomputer。Flowcalculationofpowersystemisusedformonitoringandresearchontheconditionofpowersystemsteadystateoperationbasiccomputing,istheanalysisofpowersystemplanninganddesign,operationandbasictools.Inordertoimprovetherapidityandaccuracyofelectricpowernetworkautomationsystem,andmakethesystemcanreal-timesecurity,systemanalysis,thetrendofthepowernetworkchangeisanimportantinformationresources,sothepowerflowcalculationforpowernetworkisnowanaspectofthedevelopmentofthepowerflowcalculation.Themaincontentofthisarticleisbasedonsimplenetworkpowerflowcalculationofdesign,combinedwiththeNewton-Ralphmethodflowcalculation,thePQfastdecoupledpowerflowcalculationprogram,completethepowersystemflowcalculationbasedontheClanguageprogramdesign.Inthecaseofapowersysteminnormaloperation,throughtothetrendofthepowersystem(power,voltage,phaseAngle,etc.)tothepowersystemnetworkoperationstateofaparticularpointintimeisdescribed.Inthispaper,basedontheabovebasicknowledgeofnetworkpowerflowcalculationforpowersystemwiththedesign,simulation,andanalyzedtheresultprecisionoftwocalculationmethodsindifferentscenarios.KeyWords:C++programming；Powerflowcalculation;Newton-Ralphmonsonalgorithm;PQfastdecoupledmethod;Iterativecomparison湖南工业大学本科毕业设计（论文）III目录摘要..........................................................................................................................IABSTRACT.................................................................................................................II第一章绪论..............................................................................................................11.1研究背景........................................................................................................11.2发展历史........................................................................................................11.3本文主要工作................................................................................................2第二章电力网络的数学模型及求解方法................................................................32.1节点导纳矩阵................................................................................................32.1.1节点导纳矩阵的形成.........................................................................32.1.2变压器的∏型等值电路.....................................................................42.1.3节点导纳矩阵的修改.........................................................................62.2高斯消去法....................................................................................................72.3因子表和三角分解........................................................................................92.4稀疏技术......................................................................................................102.5电子网络节点编号优化..............................................................................11第三章电力系统潮流计算......................................................................................143.1潮流计算问题的节点类型..........................................................................143.2潮流计算方法..............................................................................................143.2.1潮流计算方法简介...........................................................................143.2.2牛顿-拉夫逊法和PQ分解法的特点..............................................153.2.3牛顿-拉夫逊潮流计算过程.............................................................173.2.4牛顿-拉夫逊潮流计算程序流程图.................................................203.3潮流计算的约束条件..................................................................................21第四章牛拉法编程实现..........................................................................................224.1算例说明......................................................................................................224.2算例原始数据（以IEEE-4节点为例）....................................................224.2.1节点数据...........................................................................................224.2.2第二部分：支路数据......................................................................234.2.3数据文件输入范例...........................................................................244.3数据结构简介..