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哈尔滨理工大学学士学位论文-I-基于MATLAB软件的P-Q分解法潮流计算摘要电力系统潮流计算是研究电力系统稳态运行情况的一种重要的分析计算，它根据给定的运行条件及系统接线情况确定整个电力系统各部分的运行状态：各母线的电压，各元件中流过的功率，系统的功率损耗。在电力系统规划的设计和现有电力系统运行方式的研究中，都需要利用潮流计算来定量地分析比较供电方案或运行方式的合理性，可靠性和经济性。所以，电力系统潮流计算是进行电力系统故障计算，继电保护整定，安全分析的必要工具。随着电力系统网络的急剧扩大和不断复杂，运用手算进行潮流计算已经不现实。但是，伴随着计算机技术的飞速发展，基于计算机的潮流计算也就应运而生了。这样，通过潮流计算，实现对系统的分析成为可能。本文结合潮流计算的三个基本要求，紧跟该领域的发展，介绍了基于MATLAB软件P-Q分解法潮流计算的程序，该程序用于粗略的计算中小型电力网络的潮流，实现对其的分析。本文所设计的程序，在计算中，所用的算法通俗易懂并对以往的主流算法做了一些改进，提高了计算速度。同时，该程序采用了GUI人机对话，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。关键词：电力系统潮流计算；P-Q分解法；MATLAB软件哈尔滨理工大学学士学位论文-II-PowerflowcalculationofP-QmodebasedonMATLABsoftwareAbstractPowerflowcalculationisoneoftheimportantcalculationswhicharetostudytheoperationofpowersystemsteadystateanalysis.Itisbasedonthegivenoperatingconditionsandsystemwiringtoidentifythevariouspartsofthepowersystemoperatingstate:thebusesvoltage,thestreamcomponentspower,systempowerloss.bothpowersystemplanningdesignandoperationofexistingpowersystemmodeofstudyareneedtousethepowerflowcalculationtoquantitativelycomparetheprogramorrunmodepowersupplyreasonable,reliabilityandeconomy.Therefore,thepowerflowcalculationisanessentialtoolforacalculationofpowersystemfaults,protectionsetting,securityanalysis.withtherapidexpansionofpowersystemnetworkandcontinuingtobemorecomplex,usinghandcalculationforflowcalculationhasbeenunrealistic.But,withtheceleritydevelopmentincomputertechnology,computer-basedpowerflowcalculationhasalsoemerged.Inthisway,Itispossibletoanalysispowersystemthroughthepowerflowcalculation.Basedonthethreebasicrequirementsofpowerflowcalculationandfollowedbythedevelopmentofthefield,ThispaperintroducesthePQmodepowerflowcalculationprocedurebasedonMATLABsoftware.Itisusedforaroughcalculationofthesmallandmediumpowernetworktoachieveitsanalysis.Thealgorithmusedintheprocedurementionedinthispaperismoreeasytounderstandandmadesomeimprovementstoenhancethecomputing哈尔滨理工大学学士学位论文-III-speedratherthanthepast.Atthesametime,theprogramusestheGUIman-machinedialogue.SoExceltable,TXTdocumentsiscloselylinkedwiththeMATLABprogramtomaketheinputandoutputinterfacesmorehumanity.Keywords:powerflowcalculation；P-Qdecompositionmode；MATLABsoftware哈尔滨理工大学学士学位论文-IV-目录摘要......................................................................................................................IAbstract.............................................................................................................II第1章绪论........................................................................................................11.1课题背景...................................................................................................11.2电力系统潮流计算...................................................................................11.2.1电力系统潮流计算简介....................................................................11.2.2电力系统潮流计算的基本要求........................................................21.3潮流计算的意义及其发展.......................................................................31.4本次毕业设计主要工作...........................................................................4第2章潮流计算的原理及具体算法过程........................................................62.1电力网络的数学模型...............................................................................62.1.1电力网络的基本方程........................................................................62.1.2导纳矩阵的形成................................................................................72.1.3电力网络中几种特殊的数学模型....................................................82.2电力系统潮流计算.................................................................................112.2.1电力系统潮流计算数学模型..........................................................112.2.2电力系统节点分类..........................................................................122.2.3潮流计算的约束条件......................................................................132.3牛顿-拉夫逊法求解潮流计算...............................................................132.3.1牛顿-拉夫逊法原理........................................................................132.3.2P-Q分解法潮流计算.......................................................................15第3章基于MATLAB软件P-Q法潮流计算...................................................203.1P-Q分解法程序框图..............................................................................203.2计算步骤及实现各部分功能的程序.....................................................213.2.1原始数据的输入..............................................................................213.2.2导纳矩阵及B，B形成................................................................233.2.3计算不平衡功率ΔPi及修正相角Δθi.............................................253.2.4计算不平衡功率ΔQi及修正相电压ΔVi.......................................263.2.5程序运行结果的输出......................................................................27第4章算例验证与分析..................................................................................284.1算例说明及分析.....................................................................................284.1.1算例说明..........................................................................................284